commit b6512176f0178157a75d2cedc5c1e752eded6137
parent a3b8eb78028241d19676fa2b11933bb50a27b300
Author: Dan Callaghan <djc@djc.id.au>
Date: Wed, 10 Nov 2010 19:14:20 +1000
first working version of the script
Diffstat:
| A | COPYING | | | 339 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | README.markdown | | | 15 | +++++++++++++++ |
| A | mkinitrd.py | | | 171 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
3 files changed, 525 insertions(+), 0 deletions(-)
diff --git a/COPYING b/COPYING
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
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+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
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+
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+
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+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
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+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/README.markdown b/README.markdown
@@ -0,0 +1,15 @@
+This is my mkinitrd script, to generate an initrd image for booting systems
+which use lvm2 on top of md.
+
+Features:
+
+* Image contents are built entirely from the live filesystem (including dynamic
+ link dependencies)
+* Everything is detected automatically at boot time
+ * Root filesystem device is parsed from the standard root= kernel
+ argument
+ * mdadm --assemble --scan is used, to scan and assemble arrays as per
+ mdadm.conf (copied from the live filesystem)
+ * lvm2's autodetection features are used
+* If something goes wrong, you get a bash shell (and an opportunity to fix it):
+ this initrd is not suitable for noobs :-)
diff --git a/mkinitrd.py b/mkinitrd.py
@@ -0,0 +1,171 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import tempfile
+import shutil
+import re
+import subprocess
+
+def check_output(*args, **kwargs):
+ p = subprocess.Popen(*args, stdout=subprocess.PIPE, **kwargs)
+ out = p.communicate()[0]
+ if p.returncode != 0:
+ raise RuntimeError('Command %r exited with return code %r'
+ % (args[0], p.returncode))
+ return out
+
+install_set = dict()
+
+class Dir(object):
+ def install_to(self, dest):
+ os.mkdir(dest)
+
+class File(object):
+ def __init__(self, path):
+ self.path = path
+ def install_to(self, dest):
+ shutil.copy2(self.path, dest)
+
+class Symlink(object):
+ def __init__(self, target):
+ self.target = target
+ def install_to(self, dest):
+ os.symlink(self.target, dest)
+
+def install_dir(path):
+ install_set[path] = Dir()
+
+def install_config(path):
+ install_set[path] = File(path)
+
+def install_binary(path):
+ install_set[path] = File(path)
+ for line in check_output(['ldd', path]).splitlines():
+ if re.match(r'\s*linux-vdso\.so', line):
+ continue
+ m = re.match(r'\s*(\S+) => (\S+)\s+\(0x', line)
+ if m:
+ lib = m.group(2)
+ else:
+ m = re.match(r'\s*(\S+)\s+\(0x', line)
+ lib = m.group(1)
+ install_set[os.path.realpath(lib)] = File(lib)
+ if os.path.islink(lib):
+ install_set[os.path.join(os.path.realpath(os.path.dirname(lib)), os.path.basename(lib))] \
+ = Symlink(os.readlink(lib))
+
+def install_symlink(path, target):
+ install_set[path] = Symlink(target)
+
+def main():
+ install_dir('/newroot')
+ install_dir('/sys')
+ install_dir('/proc')
+ install_dir('/dev')
+ install_symlink('/lib', 'lib64')
+ install_binary('/bin/bash')
+ install_binary('/sbin/udevd')
+ install_binary('/sbin/udevadm')
+ install_config('/etc/mdadm.conf')
+ install_binary('/sbin/mdadm')
+ install_binary('/sbin/lvm')
+ for program in ['lvchange', 'lvconvert', 'lvcreate', 'lvdisplay',
+ 'lvextend', 'lvmchange', 'lvmdiskscan', 'lvmsadc', 'lvmsar', 'lvreduce',
+ 'lvremove', 'lvrename', 'lvresize', 'lvs', 'lvscan', 'pvchange', 'pvck',
+ 'pvcreate', 'pvdisplay', 'pvmove', 'pvremove', 'pvresize', 'pvs', 'pvscan',
+ 'vgcfgbackup', 'vgcfgrestore', 'vgchange', 'vgck', 'vgconvert', 'vgcreate',
+ 'vgdisplay', 'vgexport', 'vgextend', 'vgimport', 'vgmerge', 'vgmknodes',
+ 'vgreduce', 'vgremove', 'vgrename', 'vgs', 'vgscan', 'vgsplit']:
+ install_symlink('/sbin/%s' % program, 'lvm')
+ install_binary('/usr/bin/cat')
+ install_binary('/usr/bin/ls')
+ install_binary('/usr/bin/ed')
+ install_binary('/usr/bin/less')
+ install_binary('/usr/bin/mkdir')
+ install_binary('/bin/pidof')
+ install_binary('/bin/mount')
+ install_binary('/bin/umount')
+ install_binary('/sbin/switch_root')
+
+ tmpdir = tempfile.mkdtemp(prefix='mkinitrd')
+ print 'Building initrd in %s ...' % tmpdir
+ for path, obj in sorted(install_set.items(),
+ key=lambda (path, obj): (isinstance(obj, Symlink), path)):
+ print path
+ dest = tmpdir + path
+ if not os.path.exists(os.path.dirname(dest)):
+ os.makedirs(os.path.dirname(dest))
+ obj.install_to(dest)
+ open(tmpdir + '/init', 'w').write('''#!/bin/bash
+
+export PATH=/sbin:/usr/bin:/bin
+export EDITOR=ed
+
+function edo() {
+ [ -e /dev/kmsg ] && echo "initrd: $*" >/dev/kmsg
+ $* 2>&1 >/dev/kmsg || ( echo "Bailing..." ; exec /bin/bash )
+}
+
+# mount import stuff
+edo mount -n -t devtmpfs -o mode=0755 udev /dev
+edo mkdir /dev/shm /dev/pts
+edo mkdir -p -m 0755 /dev/.udev/rules.d
+edo mount -n -t devpts -o gid=5,mode=620 devpts /dev/pts
+edo mount -n -t tmpfs tmpfs /dev/shm
+edo mount -n -t sysfs none /sys
+edo mount -n -t proc none /proc
+cmdline=$(cat /proc/cmdline)
+
+# let udev do its thing
+edo udevd --daemon --resolve-names=never
+edo udevadm settle --timeout=1
+
+# set up some nice block devices to mount
+edo mdadm --quiet --assemble --scan
+edo vgchange --quiet -a y
+
+# the important bit: mount root, and /usr if defined
+root_mounted=""
+for arg in $cmdline ; do
+ if [[ "$arg" == root=* ]] ; then
+ edo mount -n -r "${arg:5}" /newroot
+ root_mounted="true"
+ break
+ fi
+done
+edo [ $root_mounted ]
+( while read -r dev mountpoint type opts rest ; do
+ if [[ "$dev" != \#* ]] && [[ "$mountpoint" == /usr ]] ; then
+ edo mount -n -r -t "$type" -o "$opts" "$dev" /newroot/usr
+ break
+ fi
+done ) </newroot/etc/fstab
+
+# clean up our version of udevd
+edo udevadm control --stop-exec-queue
+hard=""
+while pidof udevd >/dev/null 2>&1; do
+ kill $hard $(pidof udevd)
+ hard="-9"
+done
+edo umount -n /dev/pts
+edo umount -n /dev/shm
+
+# sanity check
+edo [ -x /newroot/sbin/init ]
+
+# switch to the new root
+edo exec switch_root /newroot /sbin/init $cmdline
+''')
+ os.chmod(tmpdir + '/init', 0755)
+
+ image = '/boot/initramfs.img'
+ print 'Writing image to %s' % image
+ subprocess.check_call('find . | cpio --quiet -o -H newc | gzip -9',
+ stdout=open(image, 'w'), shell=True, cwd=tmpdir)
+
+ shutil.rmtree(tmpdir)
+
+if __name__ == '__main__':
+ main()