My previous suggested patch would cause unwanted side effects when
device aliases/symlinks are used for non-crypt disks.

This patch should provide the desired result without causing a
regression:

diff -Nu cryptsetup-1.0.6/debian/initramfs/cryptroot-hook 
/target/usr/share/initramfs-tools/hooks/cryptroot
--- cryptsetup-1.0.6/debian/initramfs/cryptroot-hook    2009-02-09 
18:42:15.358063612 +0000
+++ /target/usr/share/initramfs-tools/hooks/cryptroot   2009-02-09 
18:37:40.766072461 +0000
@@ -301,6 +301,11 @@
        if [ "$altdev" != "$dev" ]; then
                echo "$altdev"
                return 0
+       elif [ "x${dev%/dev/disk/by-*/*}" = "x" ]; then
+               # support crypttab UUID/LABEL entries
+               # this is a /dev/disk/by-*/ path so return just the 'basename'
+               echo "${dev##/dev/disk/by*/}"
+               return 0
        fi
 
        return 1

-- 
cryptsetup does not understand UUID= in fstab and conf.d/resume
https://bugs.launchpad.net/bugs/287879
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