Hi, now that upstream linux-2.6 kernels support xz-compressed
ramdisks, I would like update-initramfs to support generating them.

This minimal patch WORKS FOR ME:

$ sed '/lzop/ {p; s/lzop/xz/g; }' /usr/sbin/mkinitramfs | diff -pud /usr/sbin/mkinitramfs -
--- /usr/sbin/mkinitramfs 2010-09-27 20:46:10.000000000 +1000
+++ - 2011-02-17 01:41:52.028878435 +1100
@@ -148,6 +148,7 @@ if ! `grep -q -i ^config_rd_${COMPRESS%p
fi

[ "${compress}" = lzop ] && compress="lzop -9"
+[ "${compress}" = xz ] && compress="xz -9"

if [ -d "${outfile}" ]; then
echo "${outfile} is a directory" >&2

At least this far:

$ file -s /var/tmp/cdeboo*/boot/initr*
/var/tmp/cdebootstrap-amd64~/boot/initrd.img-2.6.38-rc5:
gzip compressed data, from Unix, last modified: Thu Feb 17 01:25:54 2011
/var/tmp/cdebootstrap-amd64/boot/initrd.img-2.6.38-rc5:
xz compressed data

I haven't actually tried booting it yet, and obviously updating the
documentation is left as an exercise for the reader.

PS: xz has an -e option for "compress me harder". Given the
compress/decompress ratio for ramdisks (i.e. once vs. every boot), it
might be advisable to do "xz -9e" instead of the "xz -9" above.


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