mgalive: A module to mount Mageia Live media

Updated to work with overlay from 3.19
Signed-off-by: Thomas Backlund <tmb@mageia.org>

4 files changed, 119 insertions, 0 deletions

diff --git a/modules.d/90mgalive/mgalive-genrules.sh b/modules.d/90mgalive/mgalive-genrules.sh
new file mode 100755
index 0000000..f450ebf
--- /dev/null
+++ b/modules.d/90mgalive/mgalive-genrules.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+case "$root" in
+  mgalive:/dev/*)
+    {
+        printf 'KERNEL=="%s", RUN+="/sbin/initqueue --settled --onetime --unique /sbin/mgalive-root $env{DEVNAME}"\n' \
+            ${root#mgalive:/dev/}
+        printf 'SYMLINK=="%s", RUN+="/sbin/initqueue --settled --onetime --unique /sbin/mgalive-root $env{DEVNAME}"\n' \
+            ${root#mgalive:/dev/}
+    } >> /etc/udev/rules.d/99-mgalive.rules
+    wait_for_dev "${root#mgalive:}"
+  ;;
+  mgalive:*)
+    if [ -f "${root#mgalive:}" ]; then
+        /sbin/initqueue --settled --onetime --unique /sbin/mgalive-root "${root#mgalive:}"
+    fi
+  ;;
+esac
diff --git a/modules.d/90mgalive/mgalive-parse.sh b/modules.d/90mgalive/mgalive-parse.sh
new file mode 100755
index 0000000..7952957
--- /dev/null
+++ b/modules.d/90mgalive/mgalive-parse.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+# live images are specified with
+# root=mgalive:backingdev
+
+[ -z "$root" ] && root=$(getarg root=)
+
+if [ "${root%%:*}" = "mgalive" ] ; then
+    liveroot=$root
+fi
+
+[ "${liveroot%%:*}" = "mgalive" ] || return
+
+modprobe -q loop
+
+case "$liveroot" in
+    mgalive:LABEL=*|LABEL=*) \
+        root="${root#mgalive:}"
+        root="$(echo $root | sed 's,/,\\x2f,g')"
+        root="mgalive:/dev/disk/by-label/${root#LABEL=}"
+        rootok=1 ;;
+esac
+info "root was $liveroot, is now $root"
+
+# make sure that init doesn't complain
+[ -z "$root" ] && root="mgalive"
+
+wait_for_dev /live/union
diff --git a/modules.d/90mgalive/mgalive-root.sh b/modules.d/90mgalive/mgalive-root.sh
new file mode 100755
index 0000000..1a36c70
--- /dev/null
+++ b/modules.d/90mgalive/mgalive-root.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+. /lib/dracut-lib.sh
+
+[ -f /tmp/root.info ] && . /tmp/root.info
+
+PATH=/usr/sbin:/usr/bin:/sbin:/bin
+
+[ -z "$1" ] && exit 1
+livedev="$1"
+
+# create live tree
+mkdir -m 0755 -p /live/distrib
+mkdir -m 0755 -p /live/media
+mkdir -m 0755 -p /live/tmpfs
+mkdir -m 0755 -p /live/union
+mkdir -m 0755 -p /run/mgalive/ovlsize
+
+# fix udev isohybrid LABEL issues (mga #3334)
+# by reading the device we get, stripping away partition number,
+# and mount the resulting device
+realdev=$(echo $livedev |sed 's,\(/dev/sd[a-z]\)1,\1,g')
+
+# mount the live media
+getargbool 0 UEFI && liveuefi="yes"
+if [ -n "$liveuefi" ]; then
+    mount -n -t vfat -o ro $livedev /live/media
+else
+    mount -n -t iso9660 -o ro $realdev /live/media
+fi
+
+LOOPDEV=$( losetup -f )
+losetup -r $LOOPDEV /live/media/loopbacks/distrib-lzma.sqfs
+mount -n -t squashfs -o ro $LOOPDEV /live/distrib
+mount -n -t squashfs -o ro $LOOPDEV /run/mgalive/ovlsize
+mount -n -t tmpfs -o mode=755 /live/tmpfs /live/tmpfs
+# work and memory must be on same root
+mkdir -m 0755 -p /live/tmpfs/work
+mkdir -m 0755 -p /live/tmpfs/memory
+mount -n -t overlay overlay -o lowerdir=/live/distrib,upperdir=/live/tmpfs/memory,workdir=/live/tmpfs/work /live/union
+
+ln -s /live/union /dev/root
+
+printf '/bin/mount --rbind /live/union %s\n' "$NEWROOT" > $hookdir/mount/01-$$-live.sh
+
+need_shutdown
+
+exit 0
diff --git a/modules.d/90mgalive/module-setup.sh b/modules.d/90mgalive/module-setup.sh
new file mode 100755
index 0000000..99be401
--- /dev/null
+++ b/modules.d/90mgalive/module-setup.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+check() {
+    # a live host-only image doesn't really make a lot of sense
+    [[ $hostonly ]] && return 1
+    return 255
+}
+
+depends() {
+    return 0
+}
+
+installkernel() {
+    instmods squashfs loop overlay
+}
+
+install() {
+    inst_multiple umount dmsetup blkid dd losetup grep blockdev
+    inst_multiple -o eject
+
+    inst_hook cmdline 30 "$moddir/mgalive-parse.sh"
+    inst_hook pre-udev 30 "$moddir/mgalive-genrules.sh"
+    inst "$moddir/mgalive-root.sh" "/sbin/mgalive-root"
+    # should probably just be generally included
+    inst_rules 60-cdrom_id.rules
+}