Mac Build Scripts: Python
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Now let's try that Linux Disk Replication script in Python. Not fully tested. The current version (6mar07) has potentially destructive os module calls commented out for testing purposes.
Disk Replication
replicate.py
#!/usr/bin/python
from platform import *
from globals import *
from scripts import *
import sys, getopt, string
def usage():
errExit(2,"usage: replicate -t macType targetdev")
def getArgs():
macType = target = None
try:
opts, args = getopt.getopt(sys.argv[1:], "ht:", ["help"])
except getopt.GetoptError:
# print help information and exit:
usage()
if not opts:
usage()
for o, a in opts:
if o == "-t":
macType = a
if o in ("-h", "--help"):
usage()
if args:
target = args[0]
else:
target = os.environ.get('REPL_TARGET_DRIVE')
if target is None:
print "error: no target drive specified"
usage()
return macType, target
def verifyTarget(host):
""" target device must exist and have no partition map. Existence
is tested by probing with hdparm; partition map is probed with
fdisk.
"""
devPath = host.get_hdPath()
cmd = 'hdparm -i ' + devPath
r = os.popen(cmd)
status = r.close()
if status is not None:
errExit(8,'error: device ' + devPath + ' does not seem to exist')
cmd = ('fdisk -l ' + devPath + '| grep ' + devPath + ' | wc -l')
nPartitions = map(string.strip, os.popen(cmd).readlines())
if nPartitions:
errExit(9,'error: there appear to be existing partitions on ' + devPath)
def createPartitions(host):
""" create an fdisk script for creating partitions on the local
target drive; create an ext3 filesystem on the linux partition,
and initinitialize the swap partition. Initialializing the swap
partition has the benefit of creating a UUID for it.
"""
# generate fdisk script and apply it
devPath = host.get_hdPath()
genFdiskScript(devPath)
cmd = 'fdisk ' + devPath + ' < ' + fdiskScript
# os.system(cmd)
print 'os.system(' + cmd + ')'
# verify partition existence, and create linux filesystem and swap space
cmd = 'fdisk -l ' + devPath + ' | grep ' + host.get_linuxPart() \
+ ' | wc -l'
n_partitions = map(string.strip, os.popen(cmd).readlines())
if (not n_partitions or n_partitions[0] is not '1'):
err = 'error: no linux partition ' + host.get_linuxPart() \
+ ' for fs creation'
errExit(10, err)
# os.system('mkfs3.ext3' + host.get_linuxPart())
# os.system('mkswap' + host.get_swapPart())
print 'os.system(mkfs3.ext3 ' + host.get_linuxPart() + ')'
print 'os.system(mkswap ' + host.get_swapPart() + ')'
def setupForCopy(host):
""" verify/create all the necessary mount points
"""
## linux target
mntPath = '/mnt/' + host.get_hd() + linuxpart
if os.path.exists(mntPath):
if not os.path.isdir(mntPath):
errExit(18,'error: mount point ' + mntPath + 'is a regular file;'
+ 'it must be a directory')
# else it exists and it is a directory
else:
# it does not exist, so create it
# os.path.mkdir(mntPath,0644)
print 'os.path.mkdir(' + mntPath + ',0644)'
# mount target linux partition
cmd = 'mount -t ext3 -o rw ' + host.get_linuxPart() + ' ' + mntPath
# status = os.system(cmd)
print 'os.system(' + cmd + ')'
# if (status is not 0):
# errExit(12,'error: mount target linux partition failed: ' \
# + host.get_linuxPart() + ' to ' + mntPath)
# else:
# os.system('umount ' + mntPath)
## boot target
mntPath = '/mnt/' + host.get_hd() + swappart
if os.path.exists(mntPath):
if not os.path.isdir(mntPath):
errExit(18,'error: mount point ' + mntPath + 'is a regular file;'
+ 'it must be a directory')
# else it exists and it is a directory
else:
# it does not exist, so create it
# os.path.mkdir(mntPath,0644)
print 'os.path.mkdir(' + mntPath + ',0644)'
def copyPartitions(host,pfm):
""" copy boot partition with dd, and copy linux install image with
rsync; verify boot partition by mounting it as an hfs filesystem
"""
# copy the boot partition
mntPath = '/mnt/' + host.get_hd() + bootpart
bootimgPath = srcHome + '/' + pfm.get_imageType() + '/' + bootpartImg
cmd = 'dd if=' + bootimgPath + ' of=' + mntPath
# os.system(cmd)
print 'os.system(' + cmd + ')'
# mount/verify target boot partition
cmd = 'mount -t hfs ' + host.get_bootPart() + ' ' + mntPath
# status = os.system(cmd)
print 'os.system(' + cmd + ')'
# if (status is not 0):
# errExit(12,'error: mount target swap partition failed: ' \
# + host.get_swapPart() + ' to ' + mntPath)
# else:
# os.system('umount ' + mntPath)
# copy the linux partition
mntPath = '/mnt/' + host.get_hd() + linuxpart
linuximgPath = srcHome + '/' + pfm.get_imageType() + '/' + linuxImg
cmd = 'rsync -av ' + linuximgPath + '/ ' + mntPath + '/'
# status = os.system(cmd)
print 'os.system(' + cmd + ')'
# if (status is not 0):
# errExit(12,'error: mount target linux partition failed: ' \
# + host.get_linuxPart() + ' to ' + mntPath)
# else:
# os.system('umount ' + mntPath)
def tweakConfigFiles(host,pfm):
r1=re.compile(r'UUID=([0-9a-fA-F\-]+)')
cmd = 'vol_id ' + host.get_linuxPart() + ' | grep -i uuid'
print 'os.system(' + cmd + ')'
for line in os.popen(cmd).readlines():
m = r1.search(line)
if (m):
linuxuuid = m.group(1)
break
cmd = 'vol_id ' + host.get_swapPart() + ' | grep -i uuid'
print 'os.system(' + cmd + ')'
for line in os.popen(cmd).readlines():
print line
m = r1.search(line)
if (m):
swapuuid = m.group(1)
break
try:
genYbConf(pfm)
except:
errExit(19,"error: failed to generate yaboot configuration")
try:
genFstab(pfm,linuxuuid,swapuuid)
except:
errExit(20,"error: failed to generate fstab")
mntPath = '/mnt/' + host.get_hd() + linuxpart
cmd = 'mount -t ext3 -o rw ' + host.get_linuxPart() + ' ' + mntPath
# status = os.system(cmd)
print 'os.system(' + cmd + ')'
cmd = 'cp ' + fstabFile + ' ' + mntPath + '/etc/yaboot.conf'
# os.system(cmd)
print 'os.system(' + cmd + ')'
cmd = 'cp ' + ybConfFile + ' ' + mntPath + '/etc/fstab'
# os.system(cmd)
print 'os.system(' + cmd + ')'
cmd = 'mkofboot -b ' + host.get_bootPart() + ' ' + pfm.get_bootPart() \
+ ' -o ' + pfm.get_bootdev() + ' -C ' + mntPath \
+ '/etc/yaboot.conf ' + '--nonvram'
# status = os.system(cmd)
print 'os.system(' + cmd + ')'
# if (status is not 0):
# errExit(15,'error:failed to update boot partition')
# else:
# os.system('umount ' + mntPath)
def main():
# first, ensure root user
if os.getuid() is not 0:
errExit(1 ,"You must be root to run this script; try using sudo")
macType, target = getArgs()
h = aPlatform("host")
p = aPlatform(macType)
h.set_hd(target)
verifyTarget(h)
createPartitions(h)
setupForCopy(h)
copyPartitions(h,p)
tweakConfigFiles(h,p)
if __name__ == "__main__":
main()
globals.py
import sys
srcHome = "/root"
bootpartImg = "bootpart.img"
linuxImg = "rootdir"
fdiskScript = "/tmp/fdisk.script"
ybconfFile = "/tmp/yaboot.conf"
fstabFile = "/tmp/fstab"
bootpart = "2"
linuxpart = "3"
swappart = "4"
macType = "imac"
def errExit(errno, msg):
print msg
sys.exit(errno)
platform.py
from globals import *
import os, sys
class Platform:
def __init__(self):
self.name = "prototype"
self.hd_device = None
self.cd_device = None
self.of_bootdev = "hd:"
self.image_type = None
def get_name(self):
return self.name
def set_name(self,name):
self.name = name
def get_hd(self):
return self.hd_device
def set_hd(self,device):
self.hd_device = os.path.basename(device)
def get_cd(self):
return self.cd_device
def set_cd(self,device):
self.cd_device = os.path.basename(device)
def get_bootdev(self):
return self.of_bootdev
def set_bootdev(self,ofpath):
self.of_bootdev = ofpath
def get_hdPath(self):
return '/dev/' + self.hd_device
def get_cdPath(self):
return '/dev/' + self.cd_device
def get_linuxPart(self):
return '/dev/' + self.hd_device + linuxpart
def get_bootPart(self):
return '/dev/' + self.hd_device + bootpart
def get_swapPart(self):
return '/dev/' + self.hd_device + swappart
def get_imageType(self):
return self.image_type
class imac(Platform):
def __init__(self):
Platform.__init__(self)
self.name = "imac"
self.hd_device = "hda"
self.cd_device = "hdb"
self.image_type = "imac"
class g3(Platform):
def __init__(self):
Platform.__init__(self)
self.name = "g3"
self.hd_device = "hdc"
self.cd_device = "hda"
self.image_type = "gx"
class g4(Platform):
def __init__(self):
Platform.__init__(self)
self.name = "g4"
self.hd_device = "hda"
self.cd_device = "hdc"
self.image_type = "gx"
class host(Platform):
def __init__(self):
Platform.__init__(self)
self.name = "host"
self.hd_device = None
self.cd_device = None
self.of_bootdev = None
def aPlatform(name):
if name == "imac":
return imac()
elif name == "g3":
return g3()
elif name == "g4":
return g4()
elif name == "host":
return host()
else:
errExit(17,'error: unknown platform type ' + name)
def dump_platform(p):
print 'name : %s '% p.get_name()
print 'hd : %s '% p.get_hd()
print 'cd : %s '% p.get_cd()
print 'of_bootdev: %s '% p.get_bootdev()
print
if __name__ == "__main__":
p = aPlatform("g4")
dump_platform(p)