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firstboot: add support for union mounts

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17778 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2009-09-27 22:56:21 +00:00
parent 2346d031cb
commit 9f19c5e029
1 changed files with 55 additions and 18 deletions
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73
package/base-files/files/sbin/firstboot
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@ -48,7 +48,12 @@ pivot() { # <new_root> <old_root>
fopivot() { # <rw_root> <ro_root> <dupe?>
root=$1
{
mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
if grep -q mini_fo /proc/filesystems; then
mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
else
mount --bind / /mnt
mount --bind -o union "$1" /mnt && root=/mnt
fi
} || {
[ "$3" = "1" ] && {
mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
@ -60,6 +65,7 @@ fopivot() { # <rw_root> <ro_root> <dupe?>
ramoverlay() {
mkdir -p /tmp/root
mount -t tmpfs root /tmp/root
fopivot /tmp/root /rom 1
}
@ -78,28 +84,59 @@ ramoverlay() {
}
[ "$1" = "switch2jffs" ] && {
mount "$mtdpart" /rom/jffs -t jffs2 || exit
if grep -q mini_fo /proc/filesystems; then
mount "$mtdpart" /rom/jffs -t jffs2 || exit
# try to avoid fs changing while copying
mount -o remount,ro none / 2>&-
# try to avoid fs changing while copying
mount -o remount,ro none / 2>&-
# copy ramoverlay to jffs2
echo -n "copying files ... "
cp -a /tmp/root/* /rom/jffs 2>&-
echo "done"
# copy ramoverlay to jffs2
echo -n "copying files ... "
cp -a /tmp/root/* /rom/jffs 2>&-
echo "done"
# switch back to squashfs (temporarily)
# and park the ramdisk ontop of /tmp/root
pivot /rom /mnt
mount -o move /mnt /tmp/root
# switch back to squashfs (temporarily)
# and park the ramdisk ontop of /tmp/root
pivot /rom /mnt
mount -o move /mnt /tmp/root
# /jffs is the overlay
# /rom is the readonly
fopivot /jffs /rom
# /jffs is the overlay
# /rom is the readonly
fopivot /jffs /rom
# try to get rid of /tmp/root
# this will almost always fail
umount /tmp/root 2>&-
# try to get rid of /tmp/root
# this will almost always fail
umount /tmp/root 2>&-
else
# switch back to squashfs temporarily
pivot /rom /mnt
# get rid of the old overlay
umount -l /mnt
# another umount to get rid of the bind from /tmp/root
umount -l /mnt
# initialize jffs2
mount "$mtdpart" /jffs -t jffs2 || exit
# workaround to ensure that union can attach properly
sync
ls /jffs >/dev/null
# switch to the new (empty) jffs2
fopivot /jffs /rom 1
# copy ramoverlay to jffs2, must be done after switching
# to the new rootfs to avoid creating opaque directories
echo -n "copying files ... "
cp -a /tmp/root/* / >/dev/null 2>&1
sync
echo "done"
umount -l /jffs
umount -l /tmp/root
fi
exit 0
}