6 # Copyright (c) 2003 Intel Corporation
9 # Copyright (c) 2004-2006 The Trustees of Princeton University
10 # All rights reserved.
11 # expected /proc/partitions format
13 import os, sys, shutil
21 from Exceptions import *
24 ### handling breakpoints in the startup process
25 import select, sys, string
27 ### global debug settings
28 # NOTE. when BREAKPOINT_MODE turns out enabled,
29 # you have to attend the boot phase, that would hang otherwise
31 # enabling this will cause the node to ask for breakpoint-mode at startup
32 # production code should read False/False
34 # default for when prompt is turned off, or it's on but the timeout triggers
38 # in seconds : if no input, proceed
41 def prompt_for_breakpoint_mode ():
43 global BREAKPOINT_MODE
45 default_answer=BREAKPOINT_MODE
51 sys.stdout.write ("Want to run in breakpoint mode ? %s "%display)
53 r,w,e = select.select ([sys.stdin],[],[],PROMPT_TIMEOUT)
55 answer = string.strip(sys.stdin.readline())
57 sys.stdout.write("\nTimed-out (%d s)"%PROMPT_TIMEOUT)
59 BREAKPOINT_MODE = ( answer == "y" or answer == "Y")
61 BREAKPOINT_MODE = default_answer
65 sys.stdout.write("\nCurrent BREAKPOINT_MODE is %s\n"%label)
67 def breakpoint (message, cmd = None):
73 message=message+" -- Entering bash - type ^D to proceed"
79 ########################################
82 from python docs for os.makedirs:
83 Throws an error exception if the leaf directory
84 already exists or cannot be created.
86 That is real useful. Instead, we'll create the directory, then use a
87 separate function to test for its existance.
89 Return 1 if the directory exists and/or has been created, a BootManagerException
90 otherwise. Does not test the writability of said directory.
99 raise BootManagerException, "Unable to create directory tree: %s" % path
105 def removedir( path ):
107 remove a directory tree, return 1 if successful, a BootManagerException
116 shutil.rmtree( path )
117 except OSError, desc:
118 raise BootManagerException, "Unable to remove directory tree: %s" % path
124 def sysexec( cmd, log= None ):
126 execute a system command, output the results to the logger
129 return 1 if command completed (return code of non-zero),
130 0 if failed. A BootManagerException is raised if the command
131 was unable to execute or was interrupted by the user with Ctrl+C
134 print ("sysexec >>> %s" % cmd)
137 prog = subprocess.Popen(shlex.split(cmd), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
139 raise BootManagerException, \
140 "Unable to create instance of subprocess.Popen " \
141 "for command: %s" % cmd
143 (stdoutdata, stderrdata) = prog.communicate()
145 log.write(stdoutdata)
147 returncode = prog.wait()
149 raise BootManagerException, "Running %s failed (rc=%d)" % (cmd,returncode)
155 def sysexec_chroot( path, cmd, log= None ):
157 same as sysexec, but inside a chroot
160 release = os.uname()[2]
161 # 2.6.12 kernels need this
162 if release[:5] == "2.6.1":
163 library = "%s/lib/libc-opendir-hack.so" % path
164 if not os.path.exists(library):
165 shutil.copy("./libc-opendir-hack.so", library)
166 preload = "/bin/env LD_PRELOAD=/lib/libc-opendir-hack.so"
167 sysexec("chroot %s %s %s" % (path, preload, cmd), log)
170 def sysexec_chroot_noerr( path, cmd, log= None ):
172 same as sysexec_chroot, but capture boot manager exceptions
176 rc= syexec_chroot( cmd, log )
177 except BootManagerException, e:
183 def sysexec_noerr( cmd, log= None ):
185 same as sysexec, but capture boot manager exceptions
189 rc= sysexec( cmd, log )
190 except BootManagerException, e:
199 change to a directory, return 1 if successful, a BootManagerException if failure
204 raise BootManagerException, "Unable to change to directory: %s" % dir
210 def removefile( filepath ):
212 removes a file, return 1 if successful, 0 if failure
215 os.remove( filepath )
217 raise BootManagerException, "Unable to remove file: %s" % filepath
223 # from: http://forums.devshed.com/archive/t-51149/
224 # Ethernet-card-address-Through-Python-or-C
227 return "%02x" % (ord(n))
229 def get_mac_from_interface(ifname):
231 given a device name, like eth0, return its mac_address.
232 return None if the device doesn't exist.
235 SIOCGIFHWADDR = 0x8927 # magic number
237 s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
238 ifname = string.strip(ifname)
239 ifr = ifname + '\0'*(32-len(ifname))
242 r= fcntl.ioctl(s.fileno(),SIOCGIFHWADDR,ifr)
243 addr = map(hexy,r[18:24])
244 ret = (':'.join(map(str, addr)))
250 def check_file_hash(filename, hash_filename):
251 """Check the file's integrity with a given hash."""
252 return sha1_file(filename) == open(hash_filename).read().split()[0].strip()
254 def sha1_file(filename):
255 """Calculate sha1 hash of file."""
263 f = file(filename, 'rb')
265 # 256 KB seems ideal for speed/memory tradeoff
266 # It wont get much faster with bigger blocks, but
268 block = f.read(256 * 1024)
273 # Simple trick to keep total heap even lower
274 # Delete the previous block, so while next one is read
275 # we wont have two allocated blocks with same size
279 raise BootManagerException, "Cannot calculate SHA1 hash of %s" % filename