Confirmed and still affecting Jaunty.
The root-cause is /usr/share/initramfs-tools/hooks/cryptroot
(debian/initramfs/cryptroot-hook in the source package).
The script is called when update-initramfs is executed. It is
responsible for correlating /etc/fstab entries with those in
/etc/crypttab and then configuring the cryptsetup related parts of the
initrd image - such as writing the keyfile name and installing any
custom keyscript.
/etc/fstab is searched for the / (root) entry. The add_device() function
then tries to canonicalise the name in canonical_device(). Although the
function correctly canonicalises LABEL= and UUID= it *does not* return a
success result. The only name format that will do that is a name
prefixed "/dev/mapper/"
When that fails there is no processing of the crypttab entry and
therefore nothing is done to the initrd image.
The solution is two-stage:
1. Add additional returns to the function when LABEL or UUID match
2. In /etc/crypttab, as the target name use the LABEL or UUID itself
The result is that add_device can then correlate the UUID of the
unlocked file-system in fstab with the containing device's LABEL or UUID
in crypttab. My only concern right now is whether the dereferencing of
symbolic links that comes after those checks ought now to be moved to
the head of the function.
Here's an example:
== /etc/fstab: ==
# / was on /dev/mapper/root during installation
UUID=c5321f6e-05c0-43a7-8757-03aa29c44b04 / ext4
relatime,errors=remount-ro 0 1
== /etc/crypttab: ==
c5321f6e-05c0-43a7-8757-03aa29c44b04
/dev/disk/by-uuid/ae87e7a1-b65b-4586-9e0a-bfc6d60cebc9
/home/tj/Media/theme-song.mp3 luks,keyscript=/usr/local/sbin/crypto-usb-key.sh
The patch required is:
diff -Nu a/usr/share/initramfs-tools/hooks/cryptroot
b/usr/share/initramfs-tools/hooks/cryptroot
--- a/usr/share/initramfs-tools/hooks/cryptroot 2009-02-08 02:09:53.571999044
+0000
+++ b/usr/share/initramfs-tools/hooks/cryptroot 2009-02-08 03:55:47.801000016
+0000
@@ -285,12 +285,14 @@
altdev="${dev#LABEL=}"
if [ "$altdev" != "$dev" ]; then
- dev="/dev/disk/by-label/$altdev"
+ echo "$altdev"
+ return 0
fi
altdev="${dev#UUID=}"
if [ "$altdev" != "$dev" ]; then
- dev="/dev/disk/by-uuid/$altdev"
+ echo "$altdev"
+ return 0
fi
if [ -h "$dev" ]; then
** Changed in: cryptsetup (Ubuntu)
Assignee: (unassigned) => TJ (intuitivenipple)
Status: New => Confirmed
--
cryptsetup does not understand UUID= in fstab and conf.d/resume
https://bugs.launchpad.net/bugs/287879
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