root / image_creator / os_type / linux.py @ 3d083be5
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from image_creator.os_type.unix import Unix |
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import re |
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class Linux(Unix): |
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def __init__(self, rootdev, ghandler): |
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super(Linux, self).__init__(rootdev, ghandler) |
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self._uuid = dict() |
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self._persistent = re.compile('/dev/[hsv]d[a-z][1-9]*') |
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def is_persistent(self, dev): |
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return not self._persistent.match(dev) |
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def get_uuid(self, dev): |
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if dev in self._uuid: |
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return self._uuid[dev] |
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for attr in self.g.blkid(dev): |
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if attr[0] == 'UUID': |
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self._uuid[dev] = attr[1] |
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return attr[1] |
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def sysprep(self): |
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"""Prepere system for image creation."""
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self.sysprep_acpid()
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self.sysprep_persistent_net_rules()
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self.sysprep_persistent_devs()
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def sysprep_acpid(self): |
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"""Replace acpid powerdown action scripts to automatically shutdown
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the system without checking if a GUI is running.
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"""
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action = '#!/bin/sh\n\nPATH=/sbin:/bin:/usr/bin\n shutdown -h now '
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'\"Power button pressed\"'
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if self.g.is_file('/etc/acpi/powerbtn.sh'): |
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self.g.write('/etc/acpi/powerbtn.sh', action) |
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elif self.g.is_file('/etc/acpi/actions/power.sh'): |
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self.g.write('/etc/acpi/actions/power.sh', action) |
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else:
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print "Warning: No acpid action file found" |
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def sysprep_persistent_net_rules(self): |
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"""Remove udev rules that will keep network interface names persistent
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after hardware changes and reboots. Those rules will be created again
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the next time the image runs.
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"""
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rule_file = '/etc/udev/rules.d/70-persistent-net.rules'
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if self.g.is_file(rule_file): |
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self.g.rm(rule_file)
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def sysprep_persistent_devs(self): |
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"""Scan fstab and grub configuration files and replace all
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non-persistent device appearences with UUIDs.
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"""
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# convert all devices in fstab to persistent
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persistent_root = self._persistent_fstab()
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# convert all devices in grub1 to persistent
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self._persistent_grub1(persistent_root)
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def _persistent_grub1(self, new_root): |
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if self.g.is_file('/boot/grub/menu.lst'): |
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grub1 = '/boot/grub/menu.lst'
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elif self.g.is_file('/etc/grub.conf'): |
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grub1 = '/etc/grub.conf'
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else:
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return
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self.g.aug_init('/', 0) |
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try:
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roots = self.g.aug_match('/files%s/title[*]/kernel/root' % grub1) |
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for root in roots: |
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dev = self.g.aug_get(root)
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if not self.is_persistent(dev): |
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# This is not always correct. Grub may contain root entries
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# for other systems, but we only support 1 OS per hard
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# disk, so this shouldn't harm.
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self.g.aug_set(root, new_root)
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finally:
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self.g.aug_save()
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self.g.aug_close()
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def _persistent_fstab(self): |
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mpoints = self.g.mountpoints()
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if len(mpoints) == 0: |
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pass # TODO: error handling |
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device_dict = dict([[mpoint, dev] for dev, mpoint in mpoints]) |
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root_dev = None
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new_fstab = ""
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fstab = self.g.cat('/etc/fstab') |
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for line in fstab.splitlines(): |
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line, dev, mpoint = self._convert_fstab_line(line, device_dict)
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new_fstab += "%s\n" % line
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if mpoint == '/': |
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root_dev = dev |
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self.g.write('/etc/fstab', new_fstab) |
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if root_dev is None: |
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pass # TODO: error handling |
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return root_dev
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def _convert_fstab_line(self, line, devices): |
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orig = line |
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line = line.split('#')[0].strip() |
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if len(line) == 0: |
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return orig, "", "" |
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entry = line.split() |
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if len(entry) != 6: |
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print "Warning: detected abnorman entry in fstab" |
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return orig, "", "" |
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dev = entry[0]
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mpoint = entry[1]
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if not self.is_persistent(dev): |
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if mpoint in devices: |
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dev = "UUID=%s" % self.get_uuid(devices[mpoint]) |
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entry[0] = dev
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else:
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# comment out the entry
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entry[0] = "#%s" % dev |
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return " ".join(entry), dev, mpoint |
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return orig, dev, mpoint
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
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