Patch for initramfs-tools (Was Re: process/procedure for fixes)

[Paul Albrecht]

On Sat, 2008-08-02 at 08:04 -0600, Tim Gardner wrote: 
> Paul Albrecht wrote:
> > Hi,
> > 
> > Does ubuntu have a process/procedure for fixes? How do I get a fix to
> > initramfs-tools pushed upstream?
> > 
> 
> Propose a patch on this list.

Hi Tim,

OK, Here's a patch to initramfs-tools that allows a user to optionally
specify a device to union mount with a loop device:

diff -Naur initramfs-tools-0.85eubuntu36.pristine/init
initramfs-tools-0.85eubuntu36.hacked/init
--- initramfs-tools-0.85eubuntu36.pristine/init 2008-04-09
09:45:23.000000000 -0500
+++ initramfs-tools-0.85eubuntu36.hacked/init 2008-08-04
09:51:31.000000000 -0500
@@ -125,6 +125,15 @@
debug=y
set -x
;;
+        snapdev=*)
+                SNAPDEV=${x#snapdev=}
+                ;;
+        snapfstype=*)
+                SNAPFSTYPE=${x#snapfstype=}
+                ;;
+ aufs)
+ AUFS=y
+ ;;
break=*)
break=${x#break=}
;;
diff -Naur initramfs-tools-0.85eubuntu36.pristine/scripts/local
initramfs-tools-0.85eubuntu36.hacked/scripts/local
--- initramfs-tools-0.85eubuntu36.pristine/scripts/local 2008-04-09
09:18:14.000000000 -0500
+++ initramfs-tools-0.85eubuntu36.hacked/scripts/local 2008-08-04
11:30:01.000000000 -0500
@@ -107,6 +107,20 @@
# FIXME This has no error checking
mount ${roflag} -o loop -t ${FSTYPE} ${LOOPFLAGS} "/host/${LOOP#/}"
${rootmnt}

+ # Optionally remount the loop device with a copy-on-write layer
+                if [ "$SNAPDEV" ] ; then
+                        mkdir -p /snap
+                        mount -n -t ${SNAPFSTYPE} ${SNAPDEV} /snap
+ if [ "$AUFS" = "y" ] ; then
+                        mount -n -t aufs -o br:/snap=rw:${rootmnt}=ro
none ${rootmnt}
+ else
+ mount -n -t unionfs -o dirs=/snap=rw:${rootmnt}=ro unionfs ${rootmnt}
+ fi
+                        if [ -d ${rootmnt}/snap ]; then
+                                mount -o move /snap ${rootmnt}/snap
+                        fi
+                fi
+
if [ -d ${rootmnt}/host ]; then
mount -o move /host ${rootmnt}/host
fi

Please review and apply to initramfs-tools. Thanks.

-- 
Paul Albrecht
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