Ovirt devel - Apr 2008 - [PATCH] misc-scripts/mount-livecd.sh - rebuild livecd iso for quick testing

rebuild livecd iso for quick testing

adds setup-rw and rebuild options to mount-livecd.sh for quick&dirty
modifications of LiveCD iso
inst


diff --git a/misc-scripts/mount-livecd.sh b/misc-scripts/mount-livecd.sh
index 9fb2be9..b8ca5f4 100755
--- a/misc-scripts/mount-livecd.sh
+++ b/misc-scripts/mount-livecd.sh
@@ -1,10 +1,59 @@
 #!/bin/bash
 
+tmp=/tmp/livecd
+squash=$tmp/squash
+iso=$tmp/iso
+initrd0=$tmp/initrd0
+
 setup() {
+    if grep -q /mnt/livecd-tmp /proc/mounts
+    then
+        echo "Already mounted, run $0 teardown"
+        exit 1
+    fi
     mkdir -p /mnt/livecd-tmp /mnt/livecd-tmp2 /mnt/livecd-tmp3
     mount -o loop $1 /mnt/livecd-tmp
     mount -o loop /mnt/livecd-tmp/LiveOS/squashfs.img /mnt/livecd-tmp2
+}
+
+setup_ro() {
+    setup $1
     mount -o loop /mnt/livecd-tmp2/LiveOS/ext3fs.img /mnt/livecd-tmp3
+    echo "Read-only LiveCD rootfs at /mnt/livecd-tmp3"
+}
+
+setup_rw() {
+    setup $1
+    rm -rf $tmp
+    mkdir -p $squash/LiveOS $iso/LiveOS $iso/isolinux $initrd0
+    cp -v --sparse=always /mnt/livecd-tmp2/LiveOS/ext3fs.img \
+        $squash/LiveOS/ext3fs.img
+    mount -o loop $squash/LiveOS/ext3fs.img /mnt/livecd-tmp3
+    cd $initrd0
+    pax -zrf /mnt/livecd-tmp/isolinux/initrd0.img
+    cd /mnt/livecd-tmp/isolinux/
+    cp isolinux.* *c32 vmlinuz0 $iso/isolinux/
+    echo "Writable LiveCD rootfs at /mnt/livecd-tmp3"
+    echo " initramfs at $initrd0"
+    echo " isolinux at $iso/isolinux"
+}
+
+rebuild() {
+    if [ ! -d $tmp ]
+    then
+        echo "Run $0 setup-rw"
+        exit 1
+    fi
+    umount /mnt/livecd-tmp3
+    mksquashfs $squash $iso/LiveOS/squashfs.img
+    pushd $initrd0
+    pax -wzx sv4cpio -f $iso/isolinux/initrd0.img *
+    popd
+    cdlabel=$(/lib/udev/vol_id -l $1)
+    # from imgcreate/live.py
+    mkisofs -J -r -hide-rr-moved -hide-joliet-trans-tbl -V $cdlabel -o $1 \
+      -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot \
+      -boot-info-table -boot-load-size 4 $iso 
 }
 
 teardown() {
@@ -12,10 +61,11 @@ teardown() {
     umount /mnt/livecd-tmp2
     umount /mnt/livecd-tmp
     rmdir /mnt/livecd-tmp*
+    rm -rf $tmp
 }
 
 usage() {
-    echo "Usage: mount-livecd <setup|teardown> <iso>"
+    echo "Usage: mount-livecd <setup|setup-rw|rebuild|teardown>
<iso>"
 }
 
 if [ $# -ne 2 ]; then
@@ -25,7 +75,13 @@ fi
 
 case "$1" in
     setup)
-	setup $2
+	setup_ro $2
+	;;
+    setup-rw)
+	setup_rw $2
+	;;
+    rebuild)
+	rebuild $2
 	;;
     teardown)
 	teardown