def getCurrentRootPartition(disk):
"""
Returns the current root partition
@type disk: string
@param disk: path to the disk [/dev/<name>]
@rtype: string
@returns: current root partition or None
"""
mountDir = mount("%s2" % disk)
if mountDir is None:
return None
path = os.path.join(mountDir, "etc/yaboot.conf")
if not os.path.exists(path):
return None
fd = open(path)
content = fd.read()
fd.close()
rootPartition = re.findall("root = .*", content)[0].split("=")[1].strip()
if not umount(mountDir):
return None
return rootPartition
def cpyRootfsToDisk(partition):
"""
Copy kernel, initrd and root file system imagens to the disk
@type partition: string
@param partition: new root device
@rtype: boolean
@returns: True if the all the files was successfully copied into partition;
False otherwise
"""
mountDir = mount(partition)
if mountDir is None:
return False
bootDir = os.path.join(mountDir, "boot")
if os.path.exists(bootDir):
shutil.rmtree(bootDir, ignore_errors=True)
shutil.copytree("/boot", bootDir)
shutil.copy(ROOTFS_IMG, mountDir)
if not umount(mountDir):
return False
return True
def updateSystem(directory, partition):
"""
Update packages in the system in directory
@type directory: string
@param directory: path to the directory which contains a copy of the whole system
@type partition: string
@param partition: new root device
@rtype: boolean
@returns: True if the system was successfully updated;
False otherwise
"""
kernel = glob.glob("/boot/vmlinuz-*")[0]
version = kernel.split("-", 1)[1]
cmd = "python %s %s %s" % (UPDATE_PKGS_SCRIPT, directory, version)
status, output = commands.getstatusoutput(cmd)
if status != 0:
return False
cleanupSystem(directory)
mountDir = mount(partition)
if mountDir is None:
return False
newrootfs = os.path.join(mountDir, NEW_ROOTFS_IMG)
if os.path.exists(newrootfs):
os.remove(newrootfs)
cmd = "mksquashfs %s %s" % (directory, newrootfs)
status, output = commands.getstatusoutput(cmd)
if status != 0:
return False
shutil.rmtree(directory)
path = os.path.dirname(directory)
if not umount(path):
return False
if not umount(mountDir):
return False
return True
def updateYabootFile(rootdev):
"""
Update /etc/yaboot.conf file with the new values
@type rootdev: string
@param rootdev: root device
@rtype: boolean
@returns: True if the /etc/yaboot.conf file was successfully updated;
False otherwise
"""
disk = rootdev[:-1]
mountDir = mount("%s2" % disk)
if mountDir is None:
return False
path = os.path.join(mountDir, "etc/yaboot.conf")
initrd = glob.glob("/boot/initrd-*")[0]
kernel = glob.glob("/boot/vmlinuz-*")[0]
label = "powerkvm-%s" % kernel.split("-", 1)[1]
fd = open(path)
content = fd.read()
fd.close()
# get root file syste mode
fsmode = re.findall("rootfsmode=..", content)
if len(fsmode) > 0:
fsmode = fsmode[0].split("=")[1]
else:
fsmode = "rw"
newEntry = NEW_YABOOT_ENTRY % {"kernel": kernel, "label": label,
"initrd": initrd, "rootdev": rootdev,
"fsmode": fsmode}
fd = open(path, "a")
fd.write(newEntry)
fd.close()
# set boot-once parameter
rc = subprocess.call("nvsetenv boot-once \"%s\" &>/dev/null" % label, shell=True)
if rc == 1:
return False
if not umount(mountDir):
return False
return True
def restoreCowPartition(disk):
"""
Restore cow partition when an error occurred during the update process
@type disk: string
@param disk: path to the disk [/dev/<name>]
@rtype: boolean
@returns: True if the cow partition content was successfully restored;
False otherwise
"""
currentRoot = getCurrentRootPartition(disk)
mountDir = mount(currentRoot)
if mountDir is None:
return False
cowDir = mount("%s5" % disk)
if cowDir is None:
return False
path = os.path.join(mountDir, COW_BACKUP)
cmd = "tar -xzp --numeric-owner -f %s -C %s" % (path, cowDir)
status, output = commands.getstatusoutput(cmd)
if status != 0:
return False
os.remove(path)
if (not umount(mountDir)) or (not umount(cowDir)):
return False
rc = subprocess.call("nvsetenv boot-once \"\" &>/dev/null", shell=True)
if rc == 1:
return False
return True