refine strategy to spot ip address, keep on calling guest_ipv4
[build.git] / module-tools.py
index db72e18..7678bdc 100755 (executable)
@@ -1,50 +1,57 @@
-#!/usr/bin/python -u
-
-subversion_id = "$Id$"
+#!/usr/bin/env python3
 
 import sys, os, os.path
 import re
 import time
+import tempfile
 from glob import glob
 from optparse import OptionParser
 
-# e.g. other_choices = [ ('d','iff') , ('g','uess') ] - lowercase 
-def prompt (question,default=True,other_choices=[],allow_outside=False):
-    if not isinstance (other_choices,list):
+# e.g. other_choices = [ ('d','iff') , ('g','uess') ] - lowercase
+def prompt(question, default=True, other_choices=[], allow_outside=False):
+    if not isinstance(other_choices, list):
         other_choices = [ other_choices ]
     chars = [ c for (c,rest) in other_choices ]
 
     choices = []
     if 'y' not in chars:
-        if default is True: choices.append('[y]')
-        else : choices.append('y')
+        if default is True:
+            choices.append('[y]')
+        else :
+            choices.append('y')
     if 'n' not in chars:
-        if default is False: choices.append('[n]')
-        else : choices.append('n')
+        if default is False:
+            choices.append('[n]')
+        else:
+            choices.append('n')
 
-    for (char,choice) in other_choices:
+    for char, choice in other_choices:
         if default == char:
-            choices.append("["+char+"]"+choice)
+            choices.append("[{}]{}".format(char, choice))
         else:
-            choices.append("<"+char+">"+choice)
+            choices.append("<{}>{}>".format(char, choice))
     try:
-        answer=raw_input(question + " " + "/".join(choices) + " ? ")
+        answer = input(question + " " + "/".join(choices) + " ? ")
         if not answer:
             return default
-        answer=answer[0].lower()
+        answer = answer[0].lower()
         if answer == 'y':
-            if 'y' in chars: return 'y'
-            else: return True
+            if 'y' in chars:
+                return 'y'
+            else:
+                return True
         elif answer == 'n':
-            if 'n' in chars: return 'n'
-            else: return False
+            if 'n' in chars:
+                return 'n'
+            else:
+                return False
         elif other_choices:
             for (char,choice) in other_choices:
                 if answer == char:
                     return char
             if allow_outside:
                 return answer
-        return prompt(question,default,other_choices)
+        return prompt(question, default, other_choices)
     except:
         raise
 
@@ -55,921 +62,1397 @@ def default_editor():
         editor = "emacs"
     return editor
 
+### fold long lines
+fold_length = 132
+
+def print_fold(line):
+    while len(line) >= fold_length:
+        print(line[:fold_length],'\\')
+        line = line[fold_length:]
+    print(line)
+
 class Command:
-    def __init__ (self,command,options):
-        self.command=command
-        self.options=options
-        self.tmp="/tmp/command-%d"%os.getpid()
+    def __init__(self, command, options):
+        self.command = command
+        self.options = options
+        self.tmp = "/tmp/command-{}".format(os.getpid())
 
-    def run (self):
+    def run(self):
+        if self.options.dry_run:
+            print('dry_run', self.command)
+            return 0
         if self.options.verbose and self.options.mode not in Main.silent_modes:
-            print '+',self.command
+            print('+', self.command)
             sys.stdout.flush()
         return os.system(self.command)
 
-    def run_silent (self):
+    def run_silent(self):
+        if self.options.dry_run:
+            print('dry_run', self.command)
+            return 0
         if self.options.verbose:
-            print '+',self.command,' .. ',
+            print('>', os.getcwd())
+            print('+', self.command, ' .. ', end=' ')
             sys.stdout.flush()
-        retcod=os.system(self.command + " &> " + self.tmp)
+        retcod = os.system("{} &> {}".format(self.command, self.tmp))
         if retcod != 0:
-            print "FAILED ! -- out+err below (command was %s)"%self.command
-            os.system("cat " + self.tmp)
-            print "FAILED ! -- end of quoted output"
+            print("FAILED ! -- out+err below (command was {})".format(self.command))
+            os.system("cat {}".format(self.tmp))
+            print("FAILED ! -- end of quoted output")
         elif self.options.verbose:
-            print "OK"
+            print("OK")
         os.unlink(self.tmp)
         return retcod
 
     def run_fatal(self):
-        if self.run_silent() !=0:
-            raise Exception,"Command %s failed"%self.command
+        if self.run_silent() != 0:
+            raise Exception("Command {} failed".format(self.command))
 
     # returns stdout, like bash's $(mycommand)
-    def output_of (self,with_stderr=False):
-        tmp="/tmp/status-%d"%os.getpid()
+    def output_of(self, with_stderr=False, binary=False):
+        if self.options.dry_run:
+            print('dry_run', self.command)
+            return 'dry_run output'
+        tmp="/tmp/status-{}".format(os.getpid())
         if self.options.debug:
-            print '+',self.command,' .. ',
+            print('+',self.command,' .. ', end=' ')
             sys.stdout.flush()
-        command=self.command
+        command = self.command
         if with_stderr:
             command += " &> "
         else:
             command += " > "
         command += tmp
         os.system(command)
-        result=file(tmp).read()
+        mode = "r" if not binary else "rb"
+        with open(tmp, mode) as f:
+            result=f.read()
         os.unlink(tmp)
         if self.options.debug:
-            print 'Done',
+            print('Done', end=' ')
         return result
 
-class Svnpath:
-    def __init__(self,path,options):
-        self.path=path
-        self.options=options
+class GitRepository:
+    type = "git"
+
+    def __init__(self, path, options):
+        self.path = path
+        self.options = options
+
+    def name(self):
+        return os.path.basename(self.path)
+
+    def url(self):
+        return self.repo_root()
+
+    def gitweb(self):
+        c = Command("git show | grep commit | awk '{{print $2;}}'", self.options)
+        out = self.__run_in_repo(c.output_of).strip()
+        return "http://git.onelab.eu/?p={}.git;a=commit;h={}".format(self.name(), out)
+
+    def repo_root(self):
+        c = Command("git remote show origin", self.options)
+        out = self.__run_in_repo(c.output_of)
+        for line in out.split('\n'):
+            if line.strip().startswith("Fetch URL:"):
+                return line.split()[2]
+
+    @classmethod
+    def clone(cls, remote, local, options, depth=None):
+        Command("rm -rf {}".format(local), options).run_silent()
+        depth_option = "" if depth is None else " --depth {}".format(depth)
+        Command("git clone{} {} {}".format(depth_option, remote, local), options).run_fatal()
+        return GitRepository(local, options)
+
+    @classmethod
+    def remote_exists(cls, remote, options):
+        return Command("git --no-pager ls-remote {} &> /dev/null".format(remote), options).run()==0
+
+    def tag_exists(self, tagname):
+        command = 'git tag -l | grep "^{}$"'.format(tagname)
+        c = Command(command, self.options)
+        out = self.__run_in_repo(c.output_of, with_stderr=True)
+        return len(out) > 0
+
+    def __run_in_repo(self, fun, *args, **kwargs):
+        cwd = os.getcwd()
+        os.chdir(self.path)
+        ret = fun(*args, **kwargs)
+        os.chdir(cwd)
+        return ret
+
+    def __run_command_in_repo(self, command, ignore_errors=False):
+        c = Command(command, self.options)
+        if ignore_errors:
+            return self.__run_in_repo(c.output_of)
+        else:
+            return self.__run_in_repo(c.run_fatal)
+
+    def __is_commit_id(self, id):
+        c = Command("git show {} | grep commit | awk '{{print $2;}}'".format(id), self.options)
+        ret = self.__run_in_repo(c.output_of, with_stderr=False)
+        if ret.strip() == id:
+            return True
+        return False
+
+    def update(self, subdir=None, recursive=None, branch="master"):
+        if branch == "master":
+            self.__run_command_in_repo("git checkout {}".format(branch))
+        else:
+            self.to_branch(branch, remote=True)
+        self.__run_command_in_repo("git fetch origin --tags", ignore_errors=True)
+        self.__run_command_in_repo("git fetch origin")
+        if not self.__is_commit_id(branch):
+            # we don't need to merge anything for commit ids.
+            self.__run_command_in_repo("git merge --ff origin/{}".format(branch))
+
+    def to_branch(self, branch, remote=True):
+        self.revert()
+        if remote:
+            command = "git branch --track {} origin/{}".format(branch, branch)
+            c = Command(command, self.options)
+            self.__run_in_repo(c.output_of, with_stderr=True)
+        return self.__run_command_in_repo("git checkout {}".format(branch))
+
+    def to_tag(self, tag):
+        self.revert()
+        return self.__run_command_in_repo("git checkout {}".format(tag))
+
+    def tag(self, tagname, logfile):
+        self.__run_command_in_repo("git tag {} -F {}".format(tagname, logfile))
+        self.commit(logfile)
+
+    def diff(self, f=""):
+        c = Command("git diff {}".format(f), self.options)
+        try:
+            return self.__run_in_repo(c.output_of, with_stderr=True)
+        except:
+            return self.__run_in_repo(c.output_of, with_stderr=True, binary=True)
+
+    def diff_with_tag(self, tagname):
+        c = Command("git diff {}".format(tagname), self.options)
+        try:
+            return self.__run_in_repo(c.output_of, with_stderr=True)
+        except:
+            return self.__run_in_repo(c.output_of, with_stderr=True, binary=True)
+
+    def commit(self, logfile, branch="master"):
+        self.__run_command_in_repo("git add .", ignore_errors=True)
+        self.__run_command_in_repo("git add -u", ignore_errors=True)
+        self.__run_command_in_repo("git commit -F  {}".format(logfile), ignore_errors=True)
+        if branch == "master" or self.__is_commit_id(branch):
+            self.__run_command_in_repo("git push")
+        else:
+            self.__run_command_in_repo("git push origin {}:{}".format(branch, branch))
+        self.__run_command_in_repo("git push --tags", ignore_errors=True)
+
+    def revert(self, f=""):
+        if f:
+            self.__run_command_in_repo("git checkout {}".format(f))
+        else:
+            # revert all
+            self.__run_command_in_repo("git --no-pager reset --hard")
+            self.__run_command_in_repo("git --no-pager clean -f")
+
+    def is_clean(self):
+        def check_commit():
+            command = "git status"
+            s = "nothing to commit, working directory clean"
+            return Command(command, self.options).output_of(True).find(s) >= 0
+        return self.__run_in_repo(check_commit)
+
+    def is_valid(self):
+        return os.path.exists(os.path.join(self.path, ".git"))
+
+
+class Repository:
+    """
+    Generic repository
+    From old times when we had svn and git
+    """
+    supported_repo_types = [ GitRepository ]
+
+    def __init__(self, path, options):
+        self.path = path
+        self.options = options
+        for repo_class in self.supported_repo_types:
+            self.repo = repo_class(self.path, self.options)
+            if self.repo.is_valid():
+                break
+
+    @classmethod
+    def remote_exists(cls, remote, options):
+        for repo_class in Repository.supported_repo_types:
+            if repo_class.remote_exists(remote, options):
+                return True
+        return False
 
-    def url_exists (self):
-        return os.system("svn list %s &> /dev/null"%self.path) == 0
+    def __getattr__(self, attr):
+        return getattr(self.repo, attr)
 
-    def dir_needs_revert (self):
-        command="svn status %s"%self.path
-        return len(Command(command,self.options).output_of(True)) != 0
-    # turns out it's the same implem.
-    def file_needs_commit (self):
-        command="svn status %s"%self.path
-        return len(Command(command,self.options).output_of(True)) != 0
 
+
+# support for tagged module is minimal, and is for the Build class only
 class Module:
 
-    svn_magic_line="--This line, and those below, will be ignored--"
-    
-    redirectors=[ # ('module_name_varname','name'),
-                  ('module_version_varname','version'),
-                  ('module_taglevel_varname','taglevel'), ]
+    edit_magic_line = "--This line, and those below, will be ignored--"
+    setting_tag_format = "Setting tag {}"
+
+    redirectors = [
+        # ('module_name_varname', 'name'),
+        ('module_version_varname', 'version'),
+        ('module_taglevel_varname', 'taglevel'),
+    ]
 
     # where to store user's config
-    config_storage="CONFIG"
-    # 
-    config={}
-
-    import commands
-    configKeys=[ ('svnpath',"Enter your toplevel svnpath",
-                  "svn+ssh://%s@svn.planet-lab.org/svn/"%commands.getoutput("id -un")),
-                 ("build", "Enter the name of your build module","build"),
-                 ('username',"Enter your firstname and lastname for changelogs",""),
-                 ("email","Enter your email address for changelogs",""),
-                 ]
+    config_storage = "CONFIG"
+    #
+    config = {}
+
+    import subprocess
+    configKeys = [
+        ('gitserver', "Enter your git server's hostname", "git.onelab.eu"),
+        ('gituser', "Enter your user name (login name) on git server", subprocess.getoutput("id -un")),
+        ("build", "Enter the name of your build module", "build"),
+        ('username', "Enter your firstname and lastname for changelogs", ""),
+        ("email", "Enter your email address for changelogs", ""),
+    ]
+
+    @classmethod
+    def prompt_config_option(cls, key, message, default):
+        cls.config[key]=input("{} [{}] : ".format(message,default)).strip() or default
+
+    @classmethod
+    def prompt_config(cls):
+        for (key,message,default) in cls.configKeys:
+            cls.config[key]=""
+            while not cls.config[key]:
+                cls.prompt_config_option(key, message, default)
 
-    @staticmethod
-    def prompt_config ():
-        for (key,message,default) in Module.configKeys:
-            Module.config[key]=""
-            while not Module.config[key]:
-                Module.config[key]=raw_input("%s [%s] : "%(message,default)).strip() or default
+    # for parsing module spec name:branch
+    matcher_branch_spec = re.compile("\A(?P<name>[\w\.\-\/]+):(?P<branch>[\w\.\-]+)\Z")
+    # special form for tagged module - for Build
+    matcher_tag_spec = re.compile("\A(?P<name>[\w\.\-\/]+)@(?P<tagname>[\w\.\-]+)\Z")
 
+    # parsing specfiles
+    matcher_rpm_define = re.compile("%(define|global)\s+(\S+)\s+(\S*)\s*")
 
-    # for parsing module spec name:branch
-    matcher_branch_spec=re.compile("\A(?P<name>[\w-]+):(?P<branch>[\w\.-]+)\Z")
-    matcher_rpm_define=re.compile("%(define|global)\s+(\S+)\s+(\S*)\s*")
+    @classmethod
+    def parse_module_spec(cls, module_spec):
+        name = branch_or_tagname = module_type = ""
 
-    def __init__ (self,module_spec,options):
-        # parse module spec
-        attempt=Module.matcher_branch_spec.match(module_spec)
+        attempt = Module.matcher_branch_spec.match(module_spec)
         if attempt:
-            self.name=attempt.group('name')
-            self.branch=attempt.group('branch')
+            module_type = "branch"
+            name=attempt.group('name')
+            branch_or_tagname=attempt.group('branch')
         else:
-            self.name=module_spec
-            self.branch=None
+            attempt = Module.matcher_tag_spec.match(module_spec)
+            if attempt:
+                module_type = "tag"
+                name=attempt.group('name')
+                branch_or_tagname=attempt.group('tagname')
+            else:
+                name = module_spec
+        return name, branch_or_tagname, module_type
 
-        self.options=options
-        self.moddir="%s/%s"%(options.workdir,self.name)
 
-    def friendly_name (self):
-        if not self.branch:
-            return self.name
-        else:
-            return "%s:%s"%(self.name,self.branch)
+    def __init__(self, module_spec, options):
+        # parse module spec
+        self.pathname, branch_or_tagname, module_type = self.parse_module_spec(module_spec)
+        self.name = os.path.basename(self.pathname)
 
-    def edge_dir (self):
-        if not self.branch:
-            return "%s/trunk"%(self.moddir)
-        else:
-            return "%s/branches/%s"%(self.moddir,self.branch)
+        if module_type == "branch":
+            self.branch = branch_or_tagname
+        elif module_type == "tag":
+            self.tagname = branch_or_tagname
 
-    def tags_dir (self):
-        return "%s/tags"%(self.moddir)
+        self.options=options
+        self.module_dir="{}/{}".format(options.workdir,self.pathname)
+        self.repository = None
+        self.build = None
 
-    def run (self,command):
+    def run(self,command):
         return Command(command,self.options).run()
-    def run_fatal (self,command):
+    def run_fatal(self,command):
         return Command(command,self.options).run_fatal()
-    def run_prompt (self,message,command):
+    def run_prompt(self,message,fun, *args):
+        fun_msg = "{}({})".format(fun.__name__, ",".join(args))
         if not self.options.verbose:
             while True:
-                choice=prompt(message,True,('s','how'))
-                if choice is True:
-                    self.run(command)
-                    return
-                elif choice is False:
+                choice = prompt(message, True, ('s','how'))
+                if choice:
+                    fun(*args)
                     return
                 else:
-                    print 'About to run:',command
+                    print('About to run function:', fun_msg)
+        else:
+            question = "{} - want to run function: {}".format(message, fun_msg)
+            if prompt(question, True):
+                fun(*args)
+
+    def friendly_name(self):
+        if hasattr(self, 'branch'):
+            return "{}:{}".format(self.pathname, self.branch)
+        elif hasattr(self, 'tagname'):
+            return "{}@{}".format(self.pathname, self.tagname)
         else:
-            question=message+" - want to run " + command
-            if prompt(question,True):
-                self.run(command)            
+            return self.pathname
 
-    @staticmethod
-    def init_homedir (options):
-        topdir=options.workdir
+    @classmethod
+    def git_remote_dir(cls, name):
+        return "{}@{}:/git/{}.git".format(cls.config['gituser'], cls.config['gitserver'], name)
+
+    ####################
+    @classmethod
+    def init_homedir(cls, options):
         if options.verbose and options.mode not in Main.silent_modes:
-            print 'Checking for',topdir
-        storage="%s/%s"%(topdir,Module.config_storage)
+            print('Checking for', options.workdir)
+        storage="{}/{}".format(options.workdir, cls.config_storage)
         # sanity check. Either the topdir exists AND we have a config/storage
         # or topdir does not exist and we create it
-        # to avoid people use their own daily svn repo
-        if os.path.isdir(topdir) and not os.path.isfile(storage):
-            print """The directory %s exists and has no CONFIG file
+        # to avoid people use their own daily work repo
+        if os.path.isdir(options.workdir) and not os.path.isfile(storage):
+            print("""The directory {} exists and has no CONFIG file
 If this is your regular working directory, please provide another one as the
-module-* commands need a fresh working dir. Make sure that you do not use 
-that for other purposes than tagging"""%topdir
+module-* commands need a fresh working dir. Make sure that you do not use
+that for other purposes than tagging""".format(options.workdir))
             sys.exit(1)
-        if not os.path.isdir (topdir):
-            print "Cannot find",topdir,"let's create it"
-            Module.prompt_config()
-            print "Checking ...",
-            Command("svn co -N %s %s"%(Module.config['svnpath'],topdir),options).run_fatal()
-            Command("svn co -N %s/%s %s/%s"%(Module.config['svnpath'],
-                                             Module.config['build'],
-                                             topdir,
-                                             Module.config['build']),options).run_fatal()
-            print "OK"
-            
-            # store config
-            f=file(storage,"w")
-            for (key,message,default) in Module.configKeys:
-                f.write("%s=%s\n"%(key,Module.config[key]))
-            f.close()
+
+        def clone_build():
+            print("Checking out build module...")
+            remote = cls.git_remote_dir(cls.config['build'])
+            local = os.path.join(options.workdir, cls.config['build'])
+            GitRepository.clone(remote, local, options, depth=1)
+            print("OK")
+
+        def store_config():
+            with open(storage, 'w') as f:
+                for (key, message, default) in Module.configKeys:
+                    f.write("{}={}\n".format(key, Module.config[key]))
             if options.debug:
-                print 'Stored',storage
-                Command("cat %s"%storage,options).run()
-        else:
+                print('Stored', storage)
+                Command("cat {}".format(storage),options).run()
+
+        def read_config():
             # read config
-            f=open(storage)
-            for line in f.readlines():
-                (key,value)=re.compile("^(.+)=(.+)$").match(line).groups()
-                Module.config[key]=value                
-            f.close()
+            with open(storage) as f:
+                for line in f.readlines():
+                    key, value = re.compile("^(.+)=(.+)$").match(line).groups()
+                    Module.config[key] = value
+
+            # owerride config variables using options.
+            if options.build_module:
+                Module.config['build'] = options.build_module
+
+        if not os.path.isdir(options.workdir):
+            print("Cannot find {}, let's create it".format(options.workdir))
+            Command("mkdir -p {}".format(options.workdir), options).run_silent()
+            cls.prompt_config()
+            clone_build()
+            store_config()
+        else:
+            read_config()
+            # check missing config options
+            old_layout = False
+            for key, message, default in cls.configKeys:
+                if key not in Module.config:
+                    print("Configuration changed for module-tools")
+                    cls.prompt_config_option(key, message, default)
+                    old_layout = True
+
+            if old_layout:
+                Command("rm -rf {}".format(options.workdir), options).run_silent()
+                Command("mkdir -p {}".format(options.workdir), options).run_silent()
+                clone_build()
+                store_config()
+
+            build_dir = os.path.join(options.workdir, cls.config['build'])
+            if not os.path.isdir(build_dir):
+                clone_build()
+            else:
+                build = Repository(build_dir, options)
+                if not build.is_clean():
+                    print("build module needs a revert")
+                    build.revert()
+                    print("OK")
+                build.update()
+
         if options.verbose and options.mode not in Main.silent_modes:
-            print '******** Using config'
+            print('******** Using config')
             for (key,message,default) in Module.configKeys:
-                print '\t',key,'=',Module.config[key]
+                print('\t{} = {}'.format(key,Module.config[key]))
 
-    def init_moddir (self):
+    def init_module_dir(self):
         if self.options.verbose:
-            print 'Checking for',self.moddir
-        if not os.path.isdir (self.moddir):
-            self.run_fatal("svn up -N %s"%self.moddir)
-        if not os.path.isdir (self.moddir):
-            raise Exception, 'Cannot find %s - check module name'%self.moddir
+            print('Checking for', self.module_dir)
+
+        if not os.path.isdir(self.module_dir):
+            self.repository = GitRepository.clone(self.git_remote_dir(self.pathname),
+                                                  self.module_dir,
+                                                  self.options)
+
+        self.repository = Repository(self.module_dir, self.options)
+
+        if self.repository.type == "git":
+            if hasattr(self, 'branch'):
+                self.repository.to_branch(self.branch)
+            elif hasattr(self, 'tagname'):
+                self.repository.to_tag(self.tagname)
+        else:
+            raise Exception('Cannot find {} - or not a git module'.format(self.module_dir))
 
-    def init_subdir (self,fullpath):
-        if self.options.verbose:
-            print 'Checking for',fullpath
-        if not os.path.isdir (fullpath):
-            self.run_fatal("svn up -N %s"%fullpath)
 
-    def revert_subdir (self,fullpath):
+    def revert_module_dir(self):
         if self.options.fast_checks:
-            if self.options.verbose: print 'Skipping revert of %s'%fullpath
+            if self.options.verbose: print('Skipping revert of {}'.format(self.module_dir))
             return
         if self.options.verbose:
-            print 'Checking whether',fullpath,'needs being reverted'
-        if Svnpath(fullpath,self.options).dir_needs_revert():
-            self.run_fatal("svn revert -R %s"%fullpath)
+            print('Checking whether', self.module_dir, 'needs being reverted')
 
-    def update_subdir (self,fullpath):
+        if not self.repository.is_clean():
+            self.repository.revert()
+
+    def update_module_dir(self):
         if self.options.fast_checks:
-            if self.options.verbose: print 'Skipping update of %s'%fullpath
+            if self.options.verbose: print('Skipping update of {}'.format(self.module_dir))
             return
         if self.options.verbose:
-            print 'Updating',fullpath
-        self.run_fatal("svn update -N %s"%fullpath)
-
-    def init_edge_dir (self):
-        # if branch, edge_dir is two steps down
-        if self.branch:
-            self.init_subdir("%s/branches"%self.moddir)
-        self.init_subdir(self.edge_dir())
+            print('Updating', self.module_dir)
 
-    def revert_edge_dir (self):
-        self.revert_subdir(self.edge_dir())
-
-    def update_edge_dir (self):
-        self.update_subdir(self.edge_dir())
-
-    def main_specname (self):
-        attempt="%s/%s.spec"%(self.edge_dir(),self.name)
-        if os.path.isfile (attempt):
-            return attempt
+        if hasattr(self, 'branch'):
+            self.repository.update(branch=self.branch)
+        elif hasattr(self, 'tagname'):
+            self.repository.update(branch=self.tagname)
         else:
-            try:
-                return glob("%s/*.spec"%self.edge_dir())[0]
-            except:
-                raise Exception, 'Cannot guess specfile for module %s'%self.name
-
-    def all_specnames (self):
-        return glob("%s/*.spec"%self.edge_dir())
+            self.repository.update()
 
-    def parse_spec (self, specfile, varnames):
+    def main_specname(self):
+        attempt = "{}/{}.spec".format(self.module_dir, self.name)
+        if os.path.isfile(attempt):
+            return attempt
+        pattern1 = "{}/*.spec".format(self.module_dir)
+        level1 = glob(pattern1)
+        if level1:
+            return level1[0]
+        pattern2 = "{}/*/*.spec".format(self.module_dir)
+        level2 = glob(pattern2)
+
+        if level2:
+            return level2[0]
+        raise Exception('Cannot guess specfile for module {} -- patterns were {} or {}'\
+                        .format(self.pathname,pattern1,pattern2))
+
+    def all_specnames(self):
+        level1 = glob("{}/*.spec".format(self.module_dir))
+        if level1:
+            return level1
+        level2 = glob("{}/*/*.spec".format(self.module_dir))
+        return level2
+
+    def parse_spec(self, specfile, varnames):
         if self.options.verbose:
-            print 'Parsing',specfile,
+            print('Parsing',specfile, end=' ')
             for var in varnames:
-                print "[%s]"%var,
-            print ""
+                print("[{}]".format(var), end=' ')
+            print("")
         result={}
-        f=open(specfile)
-        for line in f.readlines():
-            attempt=Module.matcher_rpm_define.match(line)
-            if attempt:
-                (define,var,value)=attempt.groups()
-                if var in varnames:
-                    result[var]=value
-        f.close()
+        with open(specfile, encoding='utf-8') as f:
+            for line in f.readlines():
+                attempt = Module.matcher_rpm_define.match(line)
+                if attempt:
+                    define, var, value = attempt.groups()
+                    if var in varnames:
+                        result[var] = value
         if self.options.debug:
-            print 'found',len(result),'keys'
-            for (k,v) in result.iteritems():
-                print k,'=',v
+            print('found {} keys'.format(len(result)))
+            for k, v in result.items():
+                print('{} = {}'.format(k, v))
         return result
-                
+
     # stores in self.module_name_varname the rpm variable to be used for the module's name
     # and the list of these names in self.varnames
-    def spec_dict (self):
-        specfile=self.main_specname()
-        redirector_keys = [ varname for (varname,default) in Module.redirectors]
-        redirect_dict = self.parse_spec(specfile,redirector_keys)
+    def spec_dict(self):
+        specfile = self.main_specname()
+        redirector_keys = [ varname for (varname, default) in Module.redirectors]
+        redirect_dict = self.parse_spec(specfile, redirector_keys)
         if self.options.debug:
-            print '1st pass parsing done, redirect_dict=',redirect_dict
-        varnames=[]
-        for (varname,default) in Module.redirectors:
-            if redirect_dict.has_key(varname):
-                setattr(self,varname,redirect_dict[varname])
+            print('1st pass parsing done, redirect_dict=', redirect_dict)
+        varnames = []
+        for varname, default in Module.redirectors:
+            if varname in redirect_dict:
+                setattr(self, varname, redirect_dict[varname])
                 varnames += [redirect_dict[varname]]
             else:
-                setattr(self,varname,default)
-                varnames += [ default ] 
+                setattr(self, varname, default)
+                varnames += [ default ]
         self.varnames = varnames
-        result = self.parse_spec (specfile,self.varnames)
+        result = self.parse_spec(specfile, self.varnames)
         if self.options.debug:
-            print '2st pass parsing done, varnames=',varnames,'result=',result
+            print('2st pass parsing done, varnames={} result={}'.format(varnames, result))
         return result
 
-    def patch_spec_var (self, patch_dict,define_missing=False):
+    def patch_spec_var(self, patch_dict,define_missing=False):
         for specfile in self.all_specnames():
             # record the keys that were changed
-            changed = dict ( [ (x,False) for x in patch_dict.keys() ] )
-            newspecfile=specfile+".new"
+            changed = {x : False  for x in list(patch_dict.keys()) }
+            newspecfile = "{}.new".format(specfile)
             if self.options.verbose:
-                print 'Patching',specfile,'for',patch_dict.keys()
-            spec=open (specfile)
-            new=open(newspecfile,"w")
-
-            for line in spec.readlines():
-                attempt=Module.matcher_rpm_define.match(line)
-                if attempt:
-                    (define,var,value)=attempt.groups()
-                    if var in patch_dict.keys():
-                        if self.options.debug:
-                            print 'rewriting %s as %s'%(var,patch_dict[var])
-                        new.write('%%%s %s %s\n'%(define,var,patch_dict[var]))
-                        changed[var]=True
-                        continue
-                new.write(line)
-            if define_missing:
-                for (key,was_changed) in changed.iteritems():
-                    if not was_changed:
-                        if self.options.debug:
-                            print 'rewriting missing %s as %s'%(key,patch_dict[key])
-                        new.write('\n%%define %s %s\n'%(key,patch_dict[key]))
-            spec.close()
-            new.close()
-            os.rename(newspecfile,specfile)
-
-    def unignored_lines (self, logfile):
-        result=[]
-        exclude="Tagging module %s"%self.name
+                print('Patching', specfile, 'for', list(patch_dict.keys()))
+
+            with open(specfile, encoding='utf-8') as spec:
+                with open(newspecfile, "w", encoding='utf-8') as new:
+                    for line in spec.readlines():
+                        attempt = Module.matcher_rpm_define.match(line)
+                        if attempt:
+                            define, var, value = attempt.groups()
+                            if var in list(patch_dict.keys()):
+                                if self.options.debug:
+                                    print('rewriting {} as {}'.format(var, patch_dict[var]))
+                                new.write('%{} {} {}\n'.format(define, var, patch_dict[var]))
+                                changed[var] = True
+                                continue
+                        new.write(line)
+                    if define_missing:
+                        for key, was_changed in changed.items():
+                            if not was_changed:
+                                if self.options.debug:
+                                    print('rewriting missing {} as {}'.format(key, patch_dict[key]))
+                                new.write('\n%define {} {}\n'.format(key, patch_dict[key]))
+            os.rename(newspecfile, specfile)
+
+    # returns all lines until the magic line
+    def unignored_lines(self, logfile):
+        result = []
         white_line_matcher = re.compile("\A\s*\Z")
-        for logline in file(logfile).readlines():
-            if logline.strip() == Module.svn_magic_line:
-                break
-            if logline.find(exclude) >= 0:
-                continue
-            elif white_line_matcher.match(logline):
-                continue
-            else:
-                result.append(logline.strip()+'\n')
+        with open(logfile) as f:
+            for logline in f.readlines():
+                if logline.strip() == Module.edit_magic_line:
+                    break
+                elif white_line_matcher.match(logline):
+                    continue
+                else:
+                    result.append(logline.strip()+'\n')
         return result
 
-    def insert_changelog (self, logfile, oldtag, newtag):
+    # creates a copy of the input with only the unignored lines
+    def strip_magic_line_filename(self, filein, fileout ,new_tag_name):
+       with open(fileout,'w') as f:
+           f.write(self.setting_tag_format.format(new_tag_name) + '\n')
+           for line in self.unignored_lines(filein):
+               f.write(line)
+
+    def insert_changelog(self, logfile, newtag):
         for specfile in self.all_specnames():
-            newspecfile=specfile+".new"
+            newspecfile = "{}.new".format(specfile)
             if self.options.verbose:
-                print 'Inserting changelog from %s into %s'%(logfile,specfile)
-            spec=open (specfile)
-            new=open(newspecfile,"w")
-            for line in spec.readlines():
-                new.write(line)
-                if re.compile('%changelog').match(line):
-                    dateformat="* %a %b %d %Y"
-                    datepart=time.strftime(dateformat)
-                    logpart="%s <%s> - %s"%(Module.config['username'],
-                                                 Module.config['email'],
-                                                 newtag)
-                    new.write(datepart+" "+logpart+"\n")
-                    for logline in self.unignored_lines(logfile):
-                        new.write("- " + logline)
-                    new.write("\n")
-            spec.close()
-            new.close()
+                print('Inserting changelog from {} into {}'.format(logfile, specfile))
+
+            with open(specfile) as spec:
+                with open(newspecfile,"w") as new:
+                    for line in spec.readlines():
+                        new.write(line)
+                        if re.compile('%changelog').match(line):
+                            dateformat="* %a %b %d %Y"
+                            datepart=time.strftime(dateformat)
+                            logpart="{} <{}> - {}".format(Module.config['username'],
+                                                          Module.config['email'],
+                                                          newtag)
+                            new.write("{} {}\n".format(datepart,logpart))
+                            for logline in self.unignored_lines(logfile):
+                                new.write("- " + logline)
+                            new.write("\n")
             os.rename(newspecfile,specfile)
-            
-    def show_dict (self, spec_dict):
-        if self.options.verbose:
-            for (k,v) in spec_dict.iteritems():
-                print k,'=',v
-
-    def mod_url (self):
-        return "%s/%s"%(Module.config['svnpath'],self.name)
 
-    def edge_url (self):
-        if not self.branch:
-            return "%s/trunk"%(self.mod_url())
-        else:
-            return "%s/branches/%s"%(self.mod_url(),self.branch)
-
-    def tag_name (self, spec_dict):
-        try:
-            return "%s-%s-%s"%(#spec_dict[self.module_name_varname],
-                self.name,
-                spec_dict[self.module_version_varname],
-                spec_dict[self.module_taglevel_varname])
-        except KeyError,err:
-            raise Exception, 'Something is wrong with module %s, cannot determine %s - exiting'%(self.name,err)
-
-    def tag_url (self, spec_dict):
-        return "%s/tags/%s"%(self.mod_url(),self.tag_name(spec_dict))
-
-    def check_svnpath_exists (self, url, message):
-        if self.options.fast_checks:
-            return
+    def show_dict(self, spec_dict):
         if self.options.verbose:
-            print 'Checking url (%s) %s'%(url,message),
-        ok=Svnpath(url,self.options).url_exists()
-        if ok:
-            if self.options.verbose: print 'exists - OK'
-        else:
-            if self.options.verbose: print 'KO'
-            raise Exception, 'Could not find %s URL %s'%(message,url)
+            for k, v in spec_dict.items():
+                print('{} = {}'.format(k, v))
 
-    def check_svnpath_not_exists (self, url, message):
-        if self.options.fast_checks:
-            return
-        if self.options.verbose:
-            print 'Checking url (%s) %s'%(url,message),
-        ok=not Svnpath(url,self.options).url_exists()
-        if ok:
-            if self.options.verbose: print 'does not exist - OK'
-        else:
-            if self.options.verbose: print 'KO'
-            raise Exception, '%s URL %s already exists - exiting'%(message,url)
+    def last_tag(self, spec_dict):
+        try:
+            return "{}-{}".format(spec_dict[self.module_version_varname],
+                                  spec_dict[self.module_taglevel_varname])
+        except KeyError as err:
+            raise Exception('Something is wrong with module {}, cannot determine {} - exiting'\
+                            .format(self.name, err))
 
-    # locate specfile, parse it, check it and show values
+    def tag_name(self, spec_dict):
+        return "{}-{}".format(self.name, self.last_tag(spec_dict))
 
-##############################
-    def do_version (self):
-        self.init_moddir()
-        self.init_edge_dir()
-        self.revert_edge_dir()
-        self.update_edge_dir()
-        spec_dict = self.spec_dict()
-        for varname in self.varnames:
-            if not spec_dict.has_key(varname):
-                print 'Could not find %%define for %s'%varname
-                return
-            else:
-                print "%-16s %s"%(varname,spec_dict[varname])
-        if self.options.show_urls:
-            print "%-16s %s"%('edge url',self.edge_url())
-            print "%-16s %s"%('latest tag url',self.tag_url(spec_dict))
-        if self.options.verbose:
-            print "%-16s %s"%('main specfile:',self.main_specname())
-            print "%-16s %s"%('specfiles:',self.all_specnames())
 
-##############################
-    def do_list (self):
-#        print 'verbose',self.options.verbose
-#        print 'list_tags',self.options.list_tags
-#        print 'list_branches',self.options.list_branches
-#        print 'all_modules',self.options.all_modules
-        
-        (verbose,branches,pattern,exact) = (self.options.verbose,self.options.list_branches,
-                                            self.options.list_pattern,self.options.list_exact)
-
-        extra_command=""
-        extra_message=""
-        if self.branch:
-            pattern=self.branch
-        if pattern or exact:
-            if exact:
-                if verbose: grep="%s/$"%exact
-                else: grep="^%s$"%exact
-            else:
-                grep=pattern
-            extra_command=" | grep %s"%grep
-            extra_message=" matching %s"%grep
-
-        if not branches:
-            message="==================== tags for %s"%self.friendly_name()
-            command="svn list "
-            if verbose: command+="--verbose "
-            command += "%s/tags"%self.mod_url()
-            command += extra_command
-            message += extra_message
-            if verbose: print message
-            self.run(command)
+    pattern_format="\A\s*{module}-(GITPATH)\s*(=|:=)\s*(?P<url_main>[^\s]+)/{module}[^\s]+"
 
-        else:
-            message="==================== branches for %s"%self.friendly_name()
-            command="svn list "
-            if verbose: command+="--verbose "
-            command += "%s/branches"%self.mod_url()
-            command += extra_command
-            message += extra_message
-            if verbose: print message
-            self.run(command)
+    def is_mentioned_in_tagsfile(self, tagsfile):
+        # so that {module} gets replaced from format
+        module = self.name
+        module_matcher = re.compile(Module.pattern_format.format(**locals()))
+        with open(tagsfile) as f:
+            for line in f.readlines():
+                if module_matcher.match(line):
+                    return True
+        return False
 
 ##############################
-    sync_warning="""*** WARNING
-The module-sync function has the following limitations
-* it does not handle changelogs
-* it does not scan the -tags*.mk files to adopt the new tags"""
+    # using fine_grain means replacing only those instances that currently refer to this tag
+    # otherwise, <module>-GITPATH is replaced unconditionnally
+    def patch_tags_file(self, tagsfile, oldname, newname, fine_grain=True):
+        newtagsfile = "{}.new".format(tagsfile)
+
+        with open(tagsfile) as tags:
+            with open(newtagsfile,"w") as new:
+                matches = 0
+                # fine-grain : replace those lines that refer to oldname
+                if fine_grain:
+                    if self.options.verbose:
+                        print('Replacing {} into {}\n\tin {} .. '.format(oldname, newname, tagsfile), end=' ')
+                    matcher = re.compile("^(.*){}(.*)".format(oldname))
+                    for line in tags.readlines():
+                        if not matcher.match(line):
+                            new.write(line)
+                        else:
+                            begin, end = matcher.match(line).groups()
+                            new.write(begin+newname+end+"\n")
+                            matches += 1
+                # brute-force : change uncommented lines that define <module>-GITPATH
+                else:
+                    if self.options.verbose:
+                        print('Searching for -GITPATH lines referring to /{}/\n\tin {} .. '\
+                              .format(self.pathname, tagsfile), end=' ')
+                    # so that {module} gets replaced from format
+                    module = self.name
+                    module_matcher = re.compile(Module.pattern_format.format(**locals()))
+                    for line in tags.readlines():
+                        attempt = module_matcher.match(line)
+                        if attempt:
+                            if line.find("-GITPATH") >= 0:
+                                modulepath = "{}-GITPATH".format(self.name)
+                                replacement = "{:<32}:= {}/{}.git@{}\n"\
+                                    .format(modulepath, attempt.group('url_main'), self.pathname, newname)
+                            else:
+                                print("Could not locate {}-GITPATH (be aware that support for svn has been removed)"\
+                                      .format(self.name))
+                                return
+                            if self.options.verbose:
+                                print(' ' + modulepath, end=' ')
+                            new.write(replacement)
+                            matches += 1
+                        else:
+                            new.write(line)
 
-    def do_sync(self):
+        os.rename(newtagsfile,tagsfile)
         if self.options.verbose:
-            print Module.sync_warning
-            if not prompt('Want to proceed anyway'):
-                return
+            print("{} changes".format(matches))
+        return matches
 
-        self.init_moddir()
-        self.init_edge_dir()
-        self.revert_edge_dir()
-        self.update_edge_dir()
-        spec_dict = self.spec_dict()
+    def check_tag(self, tagname, need_it=False):
+        if self.options.verbose:
+            print("Checking {} repository tag: {} - ".format(self.repository.type, tagname), end=' ')
 
-        edge_url=self.edge_url()
-        tag_name=self.tag_name(spec_dict)
-        tag_url=self.tag_url(spec_dict)
-        # check the tag does not exist yet
-        self.check_svnpath_not_exists(tag_url,"new tag")
+        found_tagname = tagname
+        found = self.repository.tag_exists(tagname)
 
-        if self.options.message:
-            svnopt='--message "%s"'%self.options.message
+        if (found and need_it) or (not found and not need_it):
+            if self.options.verbose:
+                print("OK", end=' ')
+                print("- found" if found else "- not found")
         else:
-            svnopt='--editor-cmd=%s'%self.options.editor
-        self.run_prompt("Create initial tag",
-                        "svn copy %s %s %s"%(svnopt,edge_url,tag_url))
+            if self.options.verbose:
+                print("KO")
+            exception_format = "tag ({}) is already there" if found else "can not find required tag ({})"
+            raise Exception(exception_format.format(tagname))
 
-##############################
-    def do_diff (self,compute_only=False):
-        self.init_moddir()
-        self.init_edge_dir()
-        self.revert_edge_dir()
-        self.update_edge_dir()
-        spec_dict = self.spec_dict()
-        self.show_dict(spec_dict)
+        return found_tagname
 
-        edge_url=self.edge_url()
-        tag_url=self.tag_url(spec_dict)
-        self.check_svnpath_exists(edge_url,"edge track")
-        self.check_svnpath_exists(tag_url,"latest tag")
-        command="svn diff %s %s"%(tag_url,edge_url)
-        if compute_only:
-            if self.options.verbose:
-                print 'Getting diff with %s'%command
-        diff_output = Command(command,self.options).output_of()
-        # if used as a utility
-        if compute_only:
-            return (spec_dict,edge_url,tag_url,diff_output)
-        # otherwise print the result
-        if self.options.list:
-            if diff_output:
-                print self.name
-        else:
-            if not self.options.only or diff_output:
-                print 'x'*30,'module',self.friendly_name()
-                print 'x'*20,'<',tag_url
-                print 'x'*20,'>',edge_url
-                print diff_output
 
 ##############################
-    # using fine_grain means replacing only those instances that currently refer to this tag
-    # otherwise, <module>-SVNPATH is replaced unconditionnally
-    def patch_tags_file (self, tagsfile, oldname, newname,fine_grain=True):
-        newtagsfile=tagsfile+".new"
-        tags=open (tagsfile)
-        new=open(newtagsfile,"w")
-
-        matches=0
-        # fine-grain : replace those lines that refer to oldname
-        if fine_grain:
-            if self.options.verbose:
-                print 'Replacing %s into %s\n\tin %s .. '%(oldname,newname,tagsfile),
-            matcher=re.compile("^(.*)%s(.*)"%oldname)
-            for line in tags.readlines():
-                if not matcher.match(line):
-                    new.write(line)
-                else:
-                    (begin,end)=matcher.match(line).groups()
-                    new.write(begin+newname+end+"\n")
-                    matches += 1
-        # brute-force : change uncommented lines that define <module>-SVNPATH
-        else:
-            if self.options.verbose:
-                print 'Setting %s-SVNPATH for using %s\n\tin %s .. '%(self.name,newname,tagsfile),
-            pattern="\A\s*%s-SVNPATH\s*(=|:=)\s*(?P<url_main>[^\s]+)/%s/[^\s]+"\
-                                          %(self.name,self.name)
-            matcher_module=re.compile(pattern)
-            for line in tags.readlines():
-                attempt=matcher_module.match(line)
-                if attempt:
-                    svnpath="%s-SVNPATH"%self.name
-                    replacement = "%-32s:= %s/%s/tags/%s\n"%(svnpath,attempt.group('url_main'),self.name,newname)
-                    new.write(replacement)
-                    matches += 1
-                else:
-                    new.write(line)
-        tags.close()
-        new.close()
-        os.rename(newtagsfile,tagsfile)
-        if self.options.verbose: print "%d changes"%matches
-        return matches
-
-    def do_tag (self):
-        self.init_moddir()
-        self.init_edge_dir()
-        self.revert_edge_dir()
-        self.update_edge_dir()
+    def do_tag(self):
+        self.init_module_dir()
+        self.revert_module_dir()
+        self.update_module_dir()
         # parse specfile
         spec_dict = self.spec_dict()
         self.show_dict(spec_dict)
-        
-        # side effects
-        edge_url=self.edge_url()
-        old_tag_name = self.tag_name(spec_dict)
-        old_tag_url=self.tag_url(spec_dict)
-        if (self.options.new_version):
+
+        # compute previous tag - if not bypassed
+        if not self.options.bypass:
+            old_tag_name = self.tag_name(spec_dict)
+            # sanity check
+            old_tag_name = self.check_tag(old_tag_name, need_it=True)
+
+        if self.options.new_version:
             # new version set on command line
             spec_dict[self.module_version_varname] = self.options.new_version
             spec_dict[self.module_taglevel_varname] = 0
         else:
             # increment taglevel
-            new_taglevel = str ( int (spec_dict[self.module_taglevel_varname]) + 1)
+            new_taglevel = str( int(spec_dict[self.module_taglevel_varname]) + 1)
             spec_dict[self.module_taglevel_varname] = new_taglevel
 
-        # sanity check
         new_tag_name = self.tag_name(spec_dict)
-        new_tag_url=self.tag_url(spec_dict)
-        self.check_svnpath_exists (edge_url,"edge track")
-        self.check_svnpath_exists (old_tag_url,"previous tag")
-        self.check_svnpath_not_exists (new_tag_url,"new tag")
+        # sanity check
+        new_tag_name = self.check_tag(new_tag_name, need_it=False)
 
         # checking for diffs
-        diff_output=Command("svn diff %s %s"%(old_tag_url,edge_url),
-                            self.options).output_of()
-        if len(diff_output) == 0:
-            if not prompt ("No difference in trunk for module %s, want to tag anyway"%self.name,False):
-                return
+        if not self.options.bypass:
+            diff_output = self.repository.diff_with_tag(old_tag_name)
+            if len(diff_output) == 0:
+                if not prompt("No pending difference in module {}, want to tag anyway".format(self.pathname), False):
+                    return
 
-        # side effect in trunk's specfile
+        # side effect in head's specfile
         self.patch_spec_var(spec_dict)
 
-        # prepare changelog file 
-        # we use the standard subversion magic string (see svn_magic_line)
+        # prepare changelog file
+        # we use the standard subversion magic string (see edit_magic_line)
         # so we can provide useful information, such as version numbers and diff
         # in the same file
-        changelog="/tmp/%s-%d.txt"%(self.name,os.getpid())
-        file(changelog,"w").write("""Tagging module %s - %s
-
-%s
+        changelog_plain  = "/tmp/{}-{}.edit".format(self.name, os.getpid())
+        changelog_strip  = "/tmp/{}-{}.strip".format(self.name, os.getpid())
+        setting_tag_line = Module.setting_tag_format.format(new_tag_name)
+        with open(changelog_plain, 'w') as f:
+            f.write("""
+{}
+{}
 Please write a changelog for this new tag in the section above
-"""%(self.name,new_tag_name,Module.svn_magic_line))
+""".format(Module.edit_magic_line, setting_tag_line))
+
+        if self.options.bypass:
+            pass
+        elif prompt('Want to see diffs while writing changelog', True):
+            with open(changelog_plain, "a") as f:
+                f.write('DIFF=========\n' + diff_output)
 
-        if not self.options.verbose or prompt('Want to see diffs while writing changelog',True):
-            file(changelog,"a").write('DIFF=========\n' + diff_output)
-        
         if self.options.debug:
             prompt('Proceed ?')
 
-        # edit it        
-        self.run("%s %s"%(self.options.editor,changelog))
+        # edit it
+        self.run("{} {}".format(self.options.editor, changelog_plain))
+        # strip magic line in second file
+        self.strip_magic_line_filename(changelog_plain, changelog_strip, new_tag_name)
         # insert changelog in spec
         if self.options.changelog:
-            self.insert_changelog (changelog,old_tag_name,new_tag_name)
+            self.insert_changelog(changelog_plain, new_tag_name)
 
         ## update build
-        try:
-            buildname=Module.config['build']
-        except:
-            buildname="build"
+        build_path = os.path.join(self.options.workdir, Module.config['build'])
+        build = Repository(build_path, self.options)
         if self.options.build_branch:
-            buildname+=":"+self.options.build_branch
-        build = Module(buildname,self.options)
-        build.init_moddir()
-        build.init_edge_dir()
-        build.revert_edge_dir()
-        build.update_edge_dir()
-        
-        tagsfiles=glob(build.edge_dir()+"/*-tags*.mk")
-        tagsdict=dict( [ (x,'todo') for x in tagsfiles ] )
+            build.to_branch(self.options.build_branch)
+        if not build.is_clean():
+            build.revert()
+
+        tagsfiles = glob(build.path+"/*-tags.mk")
+        tagsdict = { x : 'todo' for x in tagsfiles }
         default_answer = 'y'
+        tagsfiles.sort()
         while True:
-            for (tagsfile,status) in tagsdict.iteritems():
-                basename=os.path.basename(tagsfile)
-                print ".................... Dealing with %s"%basename
+            # do not bother if in bypass mode
+            if self.options.bypass:
+                break
+            for tagsfile in tagsfiles:
+                if not self.is_mentioned_in_tagsfile(tagsfile):
+                    if self.options.verbose:
+                        print("tagsfile {} does not mention {} - skipped".format(tagsfile, self.name))
+                    continue
+                status = tagsdict[tagsfile]
+                basename = os.path.basename(tagsfile)
+                print(".................... Dealing with {}".format(basename))
                 while tagsdict[tagsfile] == 'todo' :
-                    choice = prompt ("insert %s in %s    "%(new_tag_name,basename),default_answer,
-                                     [ ('y','es'), ('n', 'ext'), ('f','orce'), 
-                                       ('d','iff'), ('r','evert'), ('h','elp') ] ,
+                    choice = prompt("insert {} in {}    ".format(new_tag_name, basename),
+                                     default_answer,
+                                     [ ('y','es'), ('n', 'ext'), ('f','orce'),
+                                       ('d','iff'), ('r','evert'), ('c', 'at'), ('h','elp') ] ,
                                      allow_outside=True)
                     if choice == 'y':
-                        self.patch_tags_file(tagsfile,old_tag_name,new_tag_name,fine_grain=True)
+                        self.patch_tags_file(tagsfile, old_tag_name, new_tag_name, fine_grain=True)
                     elif choice == 'n':
-                        print 'Done with %s'%os.path.basename(tagsfile)
-                        tagsdict[tagsfile]='done'
+                        print('Done with {}'.format(os.path.basename(tagsfile)))
+                        tagsdict[tagsfile] = 'done'
                     elif choice == 'f':
-                        self.patch_tags_file(tagsfile,old_tag_name,new_tag_name,fine_grain=False)
+                        self.patch_tags_file(tagsfile, old_tag_name, new_tag_name, fine_grain=False)
                     elif choice == 'd':
-                        self.run("svn diff %s"%tagsfile)
+                        print(build.diff(f=os.path.basename(tagsfile)))
                     elif choice == 'r':
-                        self.run("svn revert %s"%tagsfile)
+                        build.revert(f=tagsfile)
+                    elif choice == 'c':
+                        self.run("cat {}".format(tagsfile))
                     else:
-                        name=self.name
-                        print """y: change %(name)s-SVNPATH only if it currently refers to %(old_tag_name)s
-f: unconditionnally change any line setting %(name)s-SVNPATH to using %(new_tag_name)s
+                        name = self.name
+                        print(
+"""y: change {name}-GITPATH only if it currently refers to {old_tag_name}
+f: unconditionnally change any line that assigns {name}-GITPATH to using {new_tag_name}
 d: show current diff for this tag file
 r: revert that tag file
-n: move to next file"""%locals()
+c: cat the current tag file
+n: move to next file""".format(**locals()))
 
-            if prompt("Want to review changes on tags files",False):
-                tagsdict = dict ( [ (x, 'todo') for tagsfile in tagsfiles ] )
-                default_answer='d'
+            if prompt("Want to review changes on tags files", False):
+                tagsdict = {x : 'todo' for x in tagsfiles }
+                default_answer = 'd'
             else:
                 break
 
-        paths=""
-        paths += self.edge_dir() + " "
-        paths += build.edge_dir() + " "
-        self.run_prompt("Review trunk and build","svn diff " + paths)
-        self.run_prompt("Commit trunk and build","svn commit --file %s %s"%(changelog,paths))
-        self.run_prompt("Create tag","svn copy --file %s %s %s"%(changelog,edge_url,new_tag_url))
+        def diff_all_changes():
+            print(build.diff())
+            print(self.repository.diff())
+
+        def commit_all_changes(log):
+            if hasattr(self, 'branch'):
+                self.repository.commit(log, branch=self.branch)
+            else:
+                self.repository.commit(log)
+            build.commit(log)
+
+        self.run_prompt("Review module and build", diff_all_changes)
+        self.run_prompt("Commit module and build", commit_all_changes, changelog_strip)
+        self.run_prompt("Create tag", self.repository.tag, new_tag_name, changelog_strip)
 
         if self.options.debug:
-            print 'Preserving',changelog
+            print('Preserving {} and stripped {}', changelog_plain, changelog_strip)
+        else:
+            os.unlink(changelog_plain)
+            os.unlink(changelog_strip)
+
+
+##############################
+    def do_version(self):
+        self.init_module_dir()
+        self.revert_module_dir()
+        self.update_module_dir()
+        spec_dict = self.spec_dict()
+        if self.options.www:
+            self.html_store_title('Version for module {} ({})'\
+                                  .format(self.friendly_name(), self.last_tag(spec_dict)))
+        for varname in self.varnames:
+            if varname not in spec_dict:
+                self.html_print('Could not find %define for {}'.format(varname))
+                return
+            else:
+                self.html_print("{:<16} {}".format(varname, spec_dict[varname]))
+        self.html_print("{:<16} {}".format('url', self.repository.url()))
+        if self.options.verbose:
+            self.html_print("{:<16} {}".format('main specfile:', self.main_specname()))
+            self.html_print("{:<16} {}".format('specfiles:', self.all_specnames()))
+        self.html_print_end()
+
+
+##############################
+    def do_diff(self):
+        self.init_module_dir()
+        self.revert_module_dir()
+        self.update_module_dir()
+        spec_dict = self.spec_dict()
+        self.show_dict(spec_dict)
+
+        # side effects
+        tag_name = self.tag_name(spec_dict)
+
+        # sanity check
+        tag_name = self.check_tag(tag_name, need_it=True)
+
+        if self.options.verbose:
+            print('Getting diff')
+        diff_output = self.repository.diff_with_tag(tag_name)
+
+        if self.options.list:
+            if diff_output:
+                print(self.pathname)
         else:
-            os.unlink(changelog)
-            
+            thename = self.friendly_name()
+            do_print = False
+            if self.options.www and diff_output:
+                self.html_store_title("Diffs in module {} ({}) : {} chars"\
+                                      .format(thename, self.last_tag(spec_dict), len(diff_output)))
+
+                self.html_store_raw('<p> &lt; (left) {} </p>'.format(tag_name))
+                self.html_store_raw('<p> &gt; (right) {} </p>'.format(thename))
+                self.html_store_pre(diff_output)
+            elif not self.options.www:
+                print('x'*30, 'module', thename)
+                print('x'*20, '<', tag_name)
+                print('x'*20, '>', thename)
+                print(diff_output)
+
 ##############################
-    def do_branch (self):
-
-        # save self.branch if any, as a hint for the new branch 
-        # do this before anything else and restore .branch to None, 
-        # as this is part of the class's logic
-        new_trunk_name=None
-        if self.branch:
-            new_trunk_name=self.branch
-            self.branch=None
-
-        # compute diff - a way to initialize the whole stuff
-        # do_diff already does edge_dir initialization
-        # and it checks that edge_url and tag_url exist as well
-        (spec_dict,edge_url,tag_url,diff_listing) = self.do_diff(compute_only=True)
-
-        # the version name in the trunk becomes the new branch name
-        branch_name = spec_dict[self.module_version_varname]
-
-        # figure new branch name (the one for the trunk) if not provided on the command line
-        if not new_trunk_name:
-            # heuristic is to assume 'version' is a dot-separated name
-            # we isolate the rightmost part and try incrementing it by 1
-            version=spec_dict[self.module_version_varname]
+    # store and restitute html fragments
+    @staticmethod
+    def html_href(url,text):
+        return '<a href="{}">{}</a>'.format(url, text)
+
+    @staticmethod
+    def html_anchor(url,text):
+        return '<a name="{}">{}</a>'.format(url,text)
+
+    @staticmethod
+    def html_quote(text):
+        return text.replace('&', '&#38;').replace('<', '&lt;').replace('>', '&gt;')
+
+    # only the fake error module has multiple titles
+    def html_store_title(self, title):
+        if not hasattr(self,'titles'):
+            self.titles=[]
+        self.titles.append(title)
+
+    def html_store_raw(self, html):
+        if not hasattr(self,'body'):
+            self.body=''
+        self.body += html
+
+    def html_store_pre(self, text):
+        if not hasattr(self,'body'):
+            self.body=''
+        self.body += '<pre>{}</pre>'.format(self.html_quote(text))
+
+    def html_print(self, txt):
+        if not self.options.www:
+            print(txt)
+        else:
+            if not hasattr(self, 'in_list') or not self.in_list:
+                self.html_store_raw('<ul>')
+                self.in_list = True
+            self.html_store_raw('<li>{}</li>'.format(txt))
+
+    def html_print_end(self):
+        if self.options.www:
+            self.html_store_raw('</ul>')
+
+    @staticmethod
+    def html_dump_header(title):
+        nowdate = time.strftime("%Y-%m-%d")
+        nowtime = time.strftime("%H:%M (%Z)")
+        print("""<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<title> {} </title>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<style type="text/css">
+body {{ font-family:georgia, serif; }}
+h1 {{font-size: large; }}
+p.title {{font-size: x-large; }}
+span.error {{text-weight:bold; color: red; }}
+</style>
+</head>
+<body>
+<p class='title'> {} - status on {} at {}</p>
+<ul>
+""".format(title, title, nowdate, nowtime))
+
+    @staticmethod
+    def html_dump_middle():
+        print("</ul>")
+
+    @staticmethod
+    def html_dump_footer():
+        print("</body></html")
+
+    def html_dump_toc(self):
+        if hasattr(self,'titles'):
+            for title in self.titles:
+                print('<li>', self.html_href('#'+self.friendly_name(),title), '</li>')
+
+    def html_dump_body(self):
+        if hasattr(self,'titles'):
+            for title in self.titles:
+                print('<hr /><h1>', self.html_anchor(self.friendly_name(),title), '</h1>')
+        if hasattr(self,'body'):
+            print(self.body)
+            print('<p class="top">', self.html_href('#','Back to top'), '</p>')
+
+
+
+class Build(Module):
+
+    def __get_modules(self, tagfile):
+        self.init_module_dir()
+        modules = {}
+
+        tagfile = os.path.join(self.module_dir, tagfile)
+        for line in open(tagfile):
             try:
-                m=re.compile("\A(?P<leftpart>.+)\.(?P<rightmost>[^\.]+)\Z")
-                (leftpart,rightmost)=m.match(version).groups()
-                incremented = int(rightmost)+1
-                new_trunk_name="%s.%d"%(leftpart,incremented)
+                name, url = line.split(':=')
+                name, git_path = name.rsplit('-', 1)
+                modules[name] = (git_path.strip(), url.strip())
             except:
-                raise Exception, 'Cannot figure next branch name from %s - exiting'%version
+                pass
+        return modules
+
+    def get_modules(self, tagfile):
+        modules = self.__get_modules(tagfile)
+        for module in modules:
+            module_type = tag_or_branch = ""
+
+            path_type, url = modules[module]
+            if path_type == "GITPATH":
+                module_spec = os.path.split(url)[-1].replace(".git","")
+                name, tag_or_branch, module_type = self.parse_module_spec(module_spec)
+            else:
+                tag_or_branch = os.path.split(url)[-1].strip()
+                if url.find('/tags/') >= 0:
+                    module_type = "tag"
+                elif url.find('/branches/') >= 0:
+                    module_type = "branch"
 
-        # record starting point tagname
-        latest_tag_name = self.tag_name(spec_dict)
+            modules[module] = {"module_type" : module_type,
+                               "path_type": path_type,
+                               "tag_or_branch": tag_or_branch,
+                               "url":url}
+        return modules
 
-        print "**********"
-        print "Using starting point %s (%s)"%(tag_url,latest_tag_name)
-        print "Creating branch %s  &  moving trunk to %s"%(branch_name,new_trunk_name)
-        print "**********"
 
-        # print warning if pending diffs
-        if diff_listing:
-            print """*** WARNING : Module %s has pending diffs on its trunk
-It is safe to proceed, but please note that branch %s
-will be based on latest tag %s and *not* on the current trunk"""%(self.name,branch_name,latest_tag_name)
-            while True:
-                answer = prompt ('Are you sure you want to proceed with branching',True,('d','iff'))
-                if answer is True:
-                    break
-                elif answer is False:
-                    raise Exception,"User quit"
-                elif answer == 'd':
-                    print '<<<< %s'%tag_url
-                    print '>>>> %s'%edge_url
-                    print diff_listing
-
-        branch_url = "%s/%s/branches/%s"%(Module.config['svnpath'],self.name,branch_name)
-        self.check_svnpath_not_exists (branch_url,"new branch")
-        
-        # patching trunk
-        spec_dict[self.module_version_varname]=new_trunk_name
-        spec_dict[self.module_taglevel_varname]='0'
-        # remember this in the trunk for easy location of the current branch
-        spec_dict['module_current_branch']=branch_name
-        self.patch_spec_var(spec_dict,True)
-        
-        # create commit log file
-        tmp="/tmp/branching-%d"%os.getpid()
-        f=open(tmp,"w")
-        f.write("Branch %s for module %s created (as new trunk) from tag %s\n"%(new_trunk_name,self.name,latest_tag_name))
-        f.close()
-
-        # we're done, let's commit the stuff
-        command="svn diff %s"%self.edge_dir()
-        self.run_prompt("Review changes in trunk",command)
-        command="svn copy --file %s %s %s"%(tmp,self.edge_url(),branch_url)
-        self.run_prompt("Create branch",command)
-        command="svn commit --file %s %s"%(tmp,self.edge_dir())
-        self.run_prompt("Commit trunk",command)
-        new_tag_url=self.tag_url(spec_dict)
-        command="svn copy --file %s %s %s"%(tmp,self.edge_url(),new_tag_url)
-        self.run_prompt("Create initial tag in trunk",command)
-        os.unlink(tmp)
+
+def modules_diff(first, second):
+    diff = {}
+
+    for module in first:
+        if module not in second:
+            print("=== module {} missing in right-hand side ===".format(module))
+            continue
+        if first[module]['tag_or_branch'] != second[module]['tag_or_branch']:
+            diff[module] = (first[module]['tag_or_branch'], second[module]['tag_or_branch'])
+
+    first_set = set(first.keys())
+    second_set = set(second.keys())
+
+    new_modules = list(second_set - first_set)
+    removed_modules = list(first_set - second_set)
+
+    return diff, new_modules, removed_modules
+
+def release_changelog(options, buildtag_old, buildtag_new):
+
+    # the command line expects new old, so we treat the tagfiles in the same order
+    nb_tags = len(options.distrotags)
+    if nb_tags == 1:
+        tagfile_new = tagfile_old = options.distrotags[0]
+    elif nb_tags == 2:
+        tagfile_new, tagfile_old = options.distrotags
+    else:
+        print("ERROR: provide one or two tagfile name (eg. onelab-k32-tags.mk)")
+        print("two tagfiles can be mentioned when a tagfile has been renamed")
+        return
+
+    if options.dry_run:
+        print("------------------------------ Computing Changelog from")
+        print("buildtag_old", buildtag_old, "tagfile_old", tagfile_old)
+        print("buildtag_new", buildtag_new, "tagfile_new", tagfile_new)
+        return
+
+    print('----')
+    print('----')
+    print('----')
+    print('= build tag {} to {} ='.format(buildtag_old, buildtag_new))
+    print('== distro {} ({} to {}) =='.format(tagfile_new, buildtag_old, buildtag_new))
+
+    build = Build("build@{}".format(buildtag_old), options)
+    build.init_module_dir()
+    first = build.get_modules(tagfile_old)
+
+    print(' * from', buildtag_old, build.repository.gitweb())
+
+    build = Build("build@{}".format(buildtag_new), options)
+    build.init_module_dir()
+    second = build.get_modules(tagfile_new)
+
+    print(' * to', buildtag_new, build.repository.gitweb())
+
+    diff, new_modules, removed_modules = modules_diff(first, second)
+
+
+    def get_module(name, tag):
+        if not tag or  tag == "trunk":
+            return Module("{}".format(module), options)
+        else:
+            return Module("{}@{}".format(module, tag), options)
+
+
+    for module in diff:
+        print('=== {} - {} to {} : package {} ==='.format(tagfile_new, buildtag_old, buildtag_new, module))
+
+        first, second = diff[module]
+        m = get_module(module, first)
+        os.system('rm -rf {}'.format(m.module_dir)) # cleanup module dir
+        m.init_module_dir()
+
+        print(' * from', first, m.repository.gitweb())
+
+        specfile = m.main_specname()
+        (tmpfd, tmpfile) = tempfile.mkstemp()
+        os.system("cp -f /{} {}".format(specfile, tmpfile))
+
+        m = get_module(module, second)
+        # patch for ipfw that, being managed in a separate repo, won't work for now
+        try:
+            m.init_module_dir()
+        except Exception as e:
+            print("""Could not retrieve module {} - skipped
+{{{{{{ {} }}}}}}
+""".format( m.friendly_name(), e))
+            continue
+        specfile = m.main_specname()
+
+        print(' * to', second, m.repository.gitweb())
+
+        print('{{{')
+        os.system("diff -u {} {} | sed -e 's,{},[[previous version]],'"\
+                  .format(tmpfile, specfile, tmpfile))
+        print('}}}')
+
+        os.unlink(tmpfile)
+
+    for module in new_modules:
+        print('=== {} : new package in build {} ==='.format(tagfile_new, module))
+
+    for module in removed_modules:
+        print('=== {} : removed package from build {} ==='.format(tagfile_new, module))
+
+
+def adopt_tag(options, args):
+    modules=[]
+    for module in options.modules:
+        modules += module.split()
+    for module in modules:
+        modobj=Module(module,options)
+        for tags_file in args:
+            if options.verbose:
+                print('adopting tag {} for {} in {}'.format(options.tag, module, tags_file))
+            modobj.patch_tags_file(tags_file, '_unused_', options.tag, fine_grain=False)
+    if options.verbose:
+        Command("git diff {}".format(" ".join(args)), options).run()
 
 ##############################
 class Main:
 
-    usage="""Usage: %prog options module_desc [ .. module_desc ]
-Purpose:
-  manage subversion tags and specfile
-  requires the specfile to define *version* and *taglevel*
-  OR alternatively 
-  redirection variables module_version_varname / module_taglevel_varname
-Trunk:
-  by default, the trunk of modules is taken into account
+    module_usage="""Usage: %prog [options] module_desc [ .. module_desc ]
+
+module-tools : a set of tools to manage subversion tags and specfile
+  requires the specfile to either
+  * define *version* and *taglevel*
+  OR alternatively
+  * define redirection variables module_version_varname / module_taglevel_varname
+Master:
+  by default, the 'master' branch of modules is the target
   in this case, just mention the module name as <module_desc>
 Branches:
-  if you wish to work on a branch rather than on the trunk, 
+  if you wish to work on another branch,
   you can use something like e.g. Mom:2.1 as <module_desc>
-More help:
-  see http://svn.planet-lab.org/wiki/ModuleTools
 """
+    release_usage="""Usage: %prog [options] tag1 .. tagn
+  Extract release notes from the changes in specfiles between several build tags, latest first
+  Examples:
+      release-changelog 4.2-rc25 4.2-rc24 4.2-rc23 4.2-rc22
+  You can refer to a (build) branch by prepending a colon, like in
+      release-changelog :4.2 4.2-rc25
+  You can refer to the build trunk by just mentioning 'trunk', e.g.
+      release-changelog -t coblitz-tags.mk coblitz-2.01-rc6 trunk
+  You can use 2 different tagfile names if that was renamed meanwhile
+      release-changelog -t onelab-tags.mk 5.0-rc29 -t onelab-k32-tags.mk 5.0-rc28
+"""
+    adopt_usage="""Usage: %prog [options] tag-file[s]
+  With this command you can adopt a specifi tag or branch in your tag files
+    This should be run in your daily build workdir; no call of git is done
+  Examples:
+    adopt-tag -m "plewww plcapi" -m Monitor onelab*tags.mk
+    adopt-tag -m sfa -t sfa-1.0-33 *tags.mk
+"""
+    common_usage="""More help:
+  see http://svn.planet-lab.org/wiki/ModuleTools"""
 
-    modes={ 
+    modes = {
         'list' : "displays a list of available tags or branches",
         'version' : "check latest specfile and print out details",
-        'diff' : "show difference between trunk and latest tag",
+        'diff' : "show difference between module (trunk or branch) and latest tag",
         'tag'  : """increment taglevel in specfile, insert changelog in specfile,
-                create new tag and and monitor its adoption in build/*-tags*.mk""",
-        'branch' : """create a branch for this module, from the latest tag on the trunk, 
+                create new tag and and monitor its adoption in build/*-tags.mk""",
+        'branch' : """create a branch for this module, from the latest tag on the trunk,
                   and change trunk's version number to reflect the new branch name;
                   you can specify the new branch name by using module:branch""",
-        'sync' : """create a tag from the trunk
+        'sync' : """create a tag from the module
                 this is a last resort option, mostly for repairs""",
+        'changelog' : """extract changelog between build tags
+                expected arguments are a list of tags""",
+        'adopt' : """locally adopt a specific tag""",
         }
 
     silent_modes = ['list']
+    # 'changelog' is for release-changelog
+    # 'adopt' is for 'adopt-tag'
+    regular_modes = set(modes.keys()).difference(set(['changelog','adopt']))
+
+    @staticmethod
+    def optparse_list(option, opt, value, parser):
+        try:
+            setattr(parser.values,option.dest,getattr(parser.values,option.dest)+value.split())
+        except:
+            setattr(parser.values,option.dest,value.split())
 
     def run(self):
 
         mode=None
-        for function in Main.modes.keys():
+        # hack - need to check for adopt first as 'adopt-tag' contains tag..
+        for function in [ 'adopt' ] + list(Main.modes.keys()):
             if sys.argv[0].find(function) >= 0:
                 mode = function
                 break
         if not mode:
-            print "Unsupported command",sys.argv[0]
+            print("Unsupported command",sys.argv[0])
+            print("Supported commands:" + " ".join(list(Main.modes.keys())))
             sys.exit(1)
 
-        Main.usage += "\nmodule-%s : %s"%(mode,Main.modes[mode])
-        all_modules=os.path.dirname(sys.argv[0])+"/modules.list"
-
-        parser=OptionParser(usage=Main.usage,version=subversion_id)
-        
-        if mode == 'list':
-            parser.add_option("-b","--branches",action="store_true",dest="list_branches",default=False,
-                              help="list branches")
-            parser.add_option("-t","--tags",action="store_false",dest="list_branches",
-                              help="list tags")
-            parser.add_option("-m","--match",action="store",dest="list_pattern",default=None,
-                               help="grep pattern for filtering output")
-            parser.add_option("-x","--exact-match",action="store",dest="list_exact",default=None,
-                               help="exact grep pattern for filtering output")
-        if mode == "tag" or mode == 'branch':
+        usage='undefined usage, mode={}'.format(mode)
+        if mode in Main.regular_modes:
+            usage = Main.module_usage
+            usage += Main.common_usage
+            usage += "\nmodule-{} : {}".format(mode, Main.modes[mode])
+        elif mode == 'changelog':
+            usage = Main.release_usage
+            usage += Main.common_usage
+        elif mode == 'adopt':
+            usage = Main.adopt_usage
+            usage += Main.common_usage
+
+        parser=OptionParser(usage=usage)
+
+        # the 'adopt' mode is really special and doesn't share any option
+        if mode == 'adopt':
+            parser.add_option("-m","--module",action="append",dest="modules",default=[],
+                              help="modules, can be used several times or with quotes")
+            parser.add_option("-t","--tag",action="store", dest="tag", default='master',
+                              help="specify the tag to adopt, default is 'master'")
+            parser.add_option("-v","--verbose", action="store_true", dest="verbose", default=False,
+                              help="run in verbose mode")
+            (options, args) = parser.parse_args()
+            options.workdir='unused'
+            options.dry_run=False
+            options.mode='adopt'
+            if len(args)==0 or len(options.modules)==0:
+                parser.print_help()
+                sys.exit(1)
+            adopt_tag(options,args)
+            return
+
+        # the other commands (module-* and release-changelog) share the same skeleton
+        if mode in [ 'tag', 'branch'] :
             parser.add_option("-s","--set-version",action="store",dest="new_version",default=None,
                               help="set new version and reset taglevel to 0")
-        if mode == "tag" :
+            parser.add_option("-0","--bypass",action="store_true",dest="bypass",default=False,
+                              help="skip checks on existence of the previous tag")
+        if mode == 'tag' :
             parser.add_option("-c","--no-changelog", action="store_false", dest="changelog", default=True,
                               help="do not update changelog section in specfile when tagging")
             parser.add_option("-b","--build-branch", action="store", dest="build_branch", default=None,
-                              help="specify a build branch; used for locating the *tags*.mk files where adoption is to take place")
-        if mode == "tag" or mode == "sync" :
+                              help="specify a build branch; used for locating the *tags.mk files where adoption is to take place")
+        if mode in [ 'tag', 'sync' ] :
             parser.add_option("-e","--editor", action="store", dest="editor", default=default_editor(),
                               help="specify editor")
-        if mode == "sync" :
-            parser.add_option("-m","--message", action="store", dest="message", default=None,
-                              help="specify log message")
-        if mode == "diff" :
-            parser.add_option("-o","--only", action="store_true", dest="only", default=False,
-                              help="report diff only for modules that exhibit differences")
-        if mode == "diff" :
+
+        if mode in ['diff','version'] :
+            parser.add_option("-W","--www", action="store", dest="www", default=False,
+                              help="export diff in html format, e.g. -W trunk")
+
+        if mode == 'diff' :
             parser.add_option("-l","--list", action="store_true", dest="list", default=False,
                               help="just list modules that exhibit differences")
 
-        if mode  == 'version':
-            parser.add_option("-u","--url", action="store_true", dest="show_urls", default=False,
-                              help="display URLs")
-            
-        # default verbosity depending on function - temp
+        default_modules_list=os.path.dirname(sys.argv[0])+"/modules.list"
         parser.add_option("-a","--all",action="store_true",dest="all_modules",default=False,
-                          help="run on all modules as found in %s"%all_modules)
-        verbose_default=False
-        if mode in ['tag','sync'] : verbose_default = True
-        parser.add_option("-v","--verbose", action="store_true", dest="verbose", default=verbose_default, 
-                          help="run in verbose mode")
-        if mode not in ['version','list']:
-            parser.add_option("-q","--quiet", action="store_false", dest="verbose", 
-                              help="run in quiet (non-verbose) mode")
-        parser.add_option("-w","--workdir", action="store", dest="workdir", 
-                          default="%s/%s"%(os.getenv("HOME"),"modules"),
+                          help="run on all modules as found in {}".format(default_modules_list))
+        parser.add_option("-f","--file",action="store",dest="modules_list",default=None,
+                          help="run on all modules found in specified file")
+        parser.add_option("-n","--dry-run",action="store_true",dest="dry_run",default=False,
+                          help="dry run - shell commands are only displayed")
+        parser.add_option("-t","--distrotags",action="callback",callback=Main.optparse_list, dest="distrotags",
+                          default=[], nargs=1,type="string",
+                          help="""specify distro-tags files, e.g. onelab-tags-4.2.mk
+-- can be set multiple times, or use quotes""")
+
+        parser.add_option("-w","--workdir", action="store", dest="workdir",
+                          default="{}/{}".format(os.getenv("HOME"),"modules"),
                           help="""name for dedicated working dir - defaults to ~/modules
 ** THIS MUST NOT ** be your usual working directory""")
-        parser.add_option("-f","--fast-checks",action="store_true",dest="fast_checks",default=False,
-                          help="skip safety checks, such as svn updates -- use with care")
-        parser.add_option("-d","--debug", action="store_true", dest="debug", default=False, 
-                          help="debug mode - mostly more verbose")
-        (options, args) = parser.parse_args()
+        parser.add_option("-F","--fast-checks",action="store_true",dest="fast_checks",default=False,
+                          help="skip safety checks, such as git pulls -- use with care")
+        parser.add_option("-B","--build-module",action="store",dest="build_module",default=None,
+                          help="specify a build module to owerride the one in the CONFIG")
+
+        # default verbosity depending on function - temp
+        verbose_modes= ['tag', 'sync', 'branch']
+
+        if mode not in verbose_modes:
+            parser.add_option("-v","--verbose", action="store_true", dest="verbose", default=False,
+                              help="run in verbose mode")
+        else:
+            parser.add_option("-q","--quiet", action="store_false", dest="verbose", default=True,
+                              help="run in quiet (non-verbose) mode")
+        options, args = parser.parse_args()
         options.mode=mode
+        if not hasattr(options,'dry_run'):
+            options.dry_run=False
+        if not hasattr(options,'www'):
+            options.www=False
+        options.debug=False
+
 
+
+        ########## module-*
         if len(args) == 0:
             if options.all_modules:
-                args=Command("grep -v '#' %s"%all_modules,options).output_of().split()
+                options.modules_list=default_modules_list
+            if options.modules_list:
+                args=Command("grep -v '#' {}".format(options.modules_list), options).output_of().split()
             else:
                 parser.print_help()
                 sys.exit(1)
         Module.init_homedir(options)
-        for modname in args:
-            module=Module(modname,options)
-            if len(args)>1 and mode not in Main.silent_modes:
-                print '========================================',module.friendly_name()
-            # call the method called do_<mode>
-            method=Module.__dict__["do_%s"%mode]
-            try:
-                method(module)
-            except Exception,e:
-                print 'Skipping failed %s: '%modname,e
 
+
+        if mode in Main.regular_modes:
+            modules = [ Module(modname, options) for modname in args ]
+            # hack: create a dummy Module to store errors/warnings
+            error_module = Module('__errors__',options)
+
+            for module in modules:
+                if len(args)>1 and mode not in Main.silent_modes:
+                    if not options.www:
+                        print('========================================', module.friendly_name())
+                # call the method called do_<mode>
+                method = Module.__dict__["do_{}".format(mode)]
+                try:
+                    method(module)
+                except Exception as e:
+                    if options.www:
+                        title='<span class="error"> Skipping module {} - failure: {} </span>'\
+                            .format(module.friendly_name(), str(e))
+                        error_module.html_store_title(title)
+                    else:
+                        import traceback
+                        traceback.print_exc()
+                        print('Skipping module {}: {}'.format(module.name,e))
+
+            if options.www:
+                if mode == "diff":
+                    modetitle="Changes to tag in {}".format(options.www)
+                elif mode == "version":
+                    modetitle="Latest tags in {}".format(options.www)
+                modules.append(error_module)
+                error_module.html_dump_header(modetitle)
+                for module in modules:
+                    module.html_dump_toc()
+                Module.html_dump_middle()
+                for module in modules:
+                    module.html_dump_body()
+                Module.html_dump_footer()
+        else:
+            # if we provide, say a b c d, we want to build (a,b) (b,c) and (c,d)
+            # remember that the changelog in the twiki comes latest first, so
+            # we typically have here latest latest-1 latest-2
+            for (tag_new,tag_old) in zip ( args[:-1], args [1:]):
+                release_changelog(options, tag_old, tag_new)
+
+
+####################
 if __name__ == "__main__" :
     try:
         Main().run()
     except KeyboardInterrupt:
-        print '\nBye'
-        
+        print('\nBye')