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)
135 prog= popen2.Popen4( cmd, 0 )
137 raise BootManagerException, \
138 "Unable to create instance of popen2.Popen4 " \
139 "for command: %s" % cmd
143 for line in prog.fromchild:
145 except KeyboardInterrupt:
146 raise BootManagerException, "Interrupted by user"
148 returncode= prog.wait()
149 if returncode != 0 and returncode != 256:
150 raise BootManagerException, "Running %s failed (rc=%d)" % (cmd,returncode)
156 def sysexec_chroot( path, cmd, log= None ):
158 same as sysexec, but inside a chroot
161 release = os.uname()[2]
162 # 2.6.12 kernels need this
163 if release[:5] == "2.6.1":
164 library = "%s/lib/libc-opendir-hack.so" % path
165 if not os.path.exists(library):
166 shutil.copy("./libc-opendir-hack.so", library)
167 preload = "/bin/env LD_PRELOAD=/lib/libc-opendir-hack.so"
168 sysexec("chroot %s %s %s" % (path, preload, cmd), log)
171 def sysexec_chroot_noerr( path, cmd, log= None ):
173 same as sysexec_chroot, but capture boot manager exceptions
177 rc= syexec_chroot( cmd, log )
178 except BootManagerException, e:
184 def sysexec_noerr( cmd, log= None ):
186 same as sysexec, but capture boot manager exceptions
190 rc= sysexec( cmd, log )
191 except BootManagerException, e:
200 change to a directory, return 1 if successful, a BootManagerException if failure
205 raise BootManagerException, "Unable to change to directory: %s" % dir
211 def removefile( filepath ):
213 removes a file, return 1 if successful, 0 if failure
216 os.remove( filepath )
218 raise BootManagerException, "Unable to remove file: %s" % filepath
224 # from: http://forums.devshed.com/archive/t-51149/
225 # Ethernet-card-address-Through-Python-or-C
228 return "%02x" % (ord(n))
230 def get_mac_from_interface(ifname):
232 given a device name, like eth0, return its mac_address.
233 return None if the device doesn't exist.
236 SIOCGIFHWADDR = 0x8927 # magic number
238 s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
239 ifname = string.strip(ifname)
240 ifr = ifname + '\0'*(32-len(ifname))
243 r= fcntl.ioctl(s.fileno(),SIOCGIFHWADDR,ifr)
244 addr = map(hexy,r[18:24])
245 ret = (':'.join(map(str, addr)))
251 def check_file_hash(filename, hash_filename):
252 """Check the file's integrity with a given hash."""
253 return sha1_file(filename) == open(hash_filename).read().split()[0].strip()
255 def sha1_file(filename):
256 """Calculate sha1 hash of file."""
259 f = file(filename, 'rb')
261 # 256 KB seems ideal for speed/memory tradeoff
262 # It wont get much faster with bigger blocks, but
264 block = f.read(256 * 1024)
269 # Simple trick to keep total heap even lower
270 # Delete the previous block, so while next one is read
271 # we wont have two allocated blocks with same size
275 raise BootManagerException, "Cannot calculate SHA1 hash of %s" % filename