Updated to support persistance and multi-boot USB sticks.

- origin:
https://svnweb.mageia.org/packages/updates/9/dracut/current/SOURCES/0511-mgalive-A-module-to-mount-Mageia-Live-media.patch?r1=1191157&r2=1231609

2 files changed, 53 insertions, 16 deletions

diff --git a/modules.d/90mgalive/mgalive-parse.sh b/modules.d/90mgalive/mgalive-parse.sh
index 7952957..8cc9ef7 100755
--- a/modules.d/90mgalive/mgalive-parse.sh
+++ b/modules.d/90mgalive/mgalive-parse.sh
@@ -18,6 +18,10 @@ case "$liveroot" in
         root="$(echo $root | sed 's,/,\\x2f,g')"
         root="mgalive:/dev/disk/by-label/${root#LABEL=}"
         rootok=1 ;;
+    mgalive:UUID=*|UUID=*) \
+	root="${root#mgalive:}"
+        root="mgalive:/dev/disk/by-uuid/${root#UUID=}"
+	rootok=1 ;;
 esac
 info "root was $liveroot, is now $root"
 
diff --git a/modules.d/90mgalive/mgalive-root.sh b/modules.d/90mgalive/mgalive-root.sh
index 1a36c70..584dccc 100755
--- a/modules.d/90mgalive/mgalive-root.sh
+++ b/modules.d/90mgalive/mgalive-root.sh
@@ -9,35 +9,68 @@ PATH=/usr/sbin:/usr/bin:/sbin:/bin
 [ -z "$1" ] && exit 1
 livedev="$1"
 
-# create live tree
+# Create live tree
 mkdir -m 0755 -p /live/distrib
 mkdir -m 0755 -p /live/media
-mkdir -m 0755 -p /live/tmpfs
+mkdir -m 0755 -p /live/overlay
 mkdir -m 0755 -p /live/union
 mkdir -m 0755 -p /run/mgalive/ovlsize
 
-# fix udev isohybrid LABEL issues (mga #3334)
-# by reading the device we get, stripping away partition number,
-# and mount the resulting device
-realdev=$(echo $livedev |sed 's,\(/dev/sd[a-z]\)1,\1,g')
+# Get the base device name
+basedev=$(echo $livedev | sed 's,\(/dev/sd[a-z]\)1,\1,g')
 
-# mount the live media
-getargbool 0 UEFI && liveuefi="yes"
-if [ -n "$liveuefi" ]; then
-    mount -n -t vfat -o ro $livedev /live/media
+# Get the base directory for locating the loopback file. In normal use this is
+# the root directory, but a multi-boot USB stick may want to override this.
+basedir=$(getarg mgalive.basedir)
+
+# Get the device or path used for persistant storage (if it exists). In normal
+# use this is another partition on the same base device, but a multi-boot USB
+# stick may want to override this.
+overlay=$(getarg mgalive.overlay)
+if [ -z "$overlay" ] ; then
+    overlay=`blkid -t LABEL=mgalive-persist -o device | grep $basedev`
+else
+    overlay=$livedev$overlay
+fi
+
+if [ -z "$basedir" -a -z "$overlay" ] ; then
+    # Fix udev isohybrid LABEL issues (mga #3334)
+    # (things have moved on - this may not be needed now)
+    media=$basedev
 else
-    mount -n -t iso9660 -o ro $realdev /live/media
+    media=$livedev
 fi
 
+info "mgalive basedev is $basedev"
+info "mgalive livedev is $livedev"
+info "mgalive basedir is $basedir/"
+info "mgalive overlay is $overlay"
+
+# Mount the live media
+mount -n -o ro $media /live/media
+
+# Mount the loopback filesystem
 LOOPDEV=$( losetup -f )
-losetup -r $LOOPDEV /live/media/loopbacks/distrib-lzma.sqfs
+if [ -e /live/media$basedir/loopbacks/distrib-lzma.sqfs ] ; then
+    # Retain support for the original draklive. Note that despite the file
+    # name, it uses xz compression.
+    losetup -r $LOOPDEV /live/media$basedir/loopbacks/distrib-lzma.sqfs
+else
+    losetup -r $LOOPDEV /live/media$basedir/loopbacks/distrib.sqfs
+fi
 mount -n -t squashfs -o ro $LOOPDEV /live/distrib
 mount -n -t squashfs -o ro $LOOPDEV /run/mgalive/ovlsize
-mount -n -t tmpfs -o mode=755 /live/tmpfs /live/tmpfs
+
+# Mount the overlay filesystem
+if [ -z "$overlay" ] ; then
+    mount -n -t tmpfs -o mode=755 none /live/overlay
+else
+    mount -n -o noatime $overlay /live/overlay
+fi
 # work and memory must be on same root
-mkdir -m 0755 -p /live/tmpfs/work
-mkdir -m 0755 -p /live/tmpfs/memory
-mount -n -t overlay overlay -o lowerdir=/live/distrib,upperdir=/live/tmpfs/memory,workdir=/live/tmpfs/work /live/union
+mkdir -m 0755 -p /live/overlay/work
+mkdir -m 0755 -p /live/overlay/memory
+mount -n -t overlay overlay -o lowerdir=/live/distrib,upperdir=/live/overlay/memory,workdir=/live/overlay/work,noatime /live/union
 
 ln -s /live/union /dev/root