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firmware
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Do not mount overlay on a certain R/W rootfs

pull/667/head
Dmitry Ermakov 2023-03-13 00:10:32 +03:00
parent b650d5503c
commit db8ea24da2
1 changed files with 39 additions and 32 deletions
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71
general/overlay/init
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@ -1,7 +1,6 @@
#!/bin/sh #!/bin/sh
on_exit() on_exit() {
{
mountpoint -q /proc && umount /proc mountpoint -q /proc && umount /proc
exec /sbin/init $* exec /sbin/init $*
} }
@ -11,36 +10,44 @@ trap on_exit 0
mount -t proc proc /proc || exit mount -t proc proc /proc || exit
grep -q overlay /proc/filesystems || exit grep -q overlay /proc/filesystems || exit
if grep -q ubifs /proc/cmdline; then if ! grep -q 'root=.*nfs\|mmcblk\|ram' /proc/cmdline; then
mount -t ubifs ubi0:rootfs_data /overlay if grep -q ubifs /proc/cmdline; then
else mount -t ubifs ubi0:rootfs_data /overlay
mtdblkdev=`awk -F ':' '/rootfs_data/ {print $1}' /proc/mtd | sed 's/mtd/mtdblock/'` else
mtdchrdev=`grep 'rootfs_data' /proc/mtd | cut -d: -f1` mtdblkdev=$(awk -F ':' '/rootfs_data/ {print $1}' /proc/mtd | sed 's/mtd/mtdblock/')
mount -t jffs2 /dev/${mtdblkdev} /overlay mtdchrdev=$(grep 'rootfs_data' /proc/mtd | cut -d: -f1)
mount -t jffs2 /dev/${mtdblkdev} /overlay
if [ $? -ne 0 ] || { dmesg | grep "jffs2.*: Magic bitmask.*not found" > /dev/null 2>&1; } then
echo "jffs2 health check error, format required!" if [ $? -ne 0 ] || { dmesg | grep "jffs2.*: Magic bitmask.*not found" >/dev/null 2>&1; }; then
flash_eraseall -j /dev/${mtdchrdev} echo "jffs2 health check error, format required!"
echo "Done! Remounting..." flash_eraseall -j /dev/${mtdchrdev}
mount -t jffs2 /dev/${mtdblkdev} /overlay || mount -t tmpfs tmpfs /overlay || exit echo "Done! Remounting..."
if ! cat /proc/mounts | grep ${mtdblkdev}; then mount -t jffs2 /dev/${mtdblkdev} /overlay || mount -t tmpfs tmpfs /overlay || exit
echo "--------------------------------" if ! cat /proc/mounts | grep ${mtdblkdev}; then
echo "Crash - your flash in the trash!" echo "--------------------------------"
echo "--------------------------------" echo "Crash - your flash in the trash!"
fi echo "--------------------------------"
fi
fi
fi fi
fi
if grep -q overlayfs /proc/filesystems; then if grep -q overlayfs /proc/filesystems; then
mount -t overlayfs overlayfs -o lowerdir=/,upperdir=/overlay,ro /mnt || { umount /overlay; exit; } mount -t overlayfs overlayfs -o lowerdir=/,upperdir=/overlay,ro /mnt || {
else umount /overlay
overlay_rootdir=/overlay/root exit
overlay_workdir=/overlay/work }
mkdir -p ${overlay_rootdir} ${overlay_workdir} else
mount -t overlay overlay -o lowerdir=/,upperdir=${overlay_rootdir},workdir=${overlay_workdir} /mnt || { umount /overlay; exit; } overlay_rootdir=/overlay/root
fi overlay_workdir=/overlay/work
mkdir -p ${overlay_rootdir} ${overlay_workdir}
mount -t overlay overlay -o lowerdir=/,upperdir=${overlay_rootdir},workdir=${overlay_workdir} /mnt || {
umount /overlay
exit
}
fi
pivot_root /mnt /mnt/rom pivot_root /mnt /mnt/rom
mount -o noatime,move /rom/proc /proc mount -o noatime,move /rom/proc /proc
mount -o noatime,move /rom/dev /dev mount -o noatime,move /rom/dev /dev
mount -o noatime,move /rom/overlay /overlay mount -o noatime,move /rom/overlay /overlay
fi