62 lines
1.3 KiB
Bash
Executable File
62 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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PATH=/bin:/sbin
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SQUASH_IMG=/squash/root.img
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SQUASH_MNT=/squash/root
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SQUASH_MNT_REC=/squash/mounts
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SQUASHED_MNT="usr etc"
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echo $SQUASH_MNT > $SQUASH_MNT_REC
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# Following mount points are neccessary for mounting a squash image
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[ ! -d /proc/self ] && \
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mount -t proc -o nosuid,noexec,nodev proc /proc
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[ ! -d /sys/kernel ] && \
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mount -t sysfs -o nosuid,noexec,nodev sysfs /sys
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[ ! -e /dev/loop-control ] && \
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mount -t devtmpfs -o mode=0755,noexec,nosuid,strictatime devtmpfs /dev
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# Need a loop device backend, overlayfs, and squashfs module
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modprobe loop
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if [ $? != 0 ]; then
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echo "Unable to setup loop module"
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fi
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modprobe squashfs
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if [ $? != 0 ]; then
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echo "Unable to setup squashfs module"
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fi
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modprobe overlay
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if [ $? != 0 ]; then
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echo "Unable to setup overlay module"
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fi
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[ ! -d "$SQUASH_MNT" ] && \
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mkdir -m 0755 -p $SQUASH_MNT
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# Mount the squashfs image
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mount -t squashfs -o ro,loop $SQUASH_IMG $SQUASH_MNT
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if [ $? != 0 ]; then
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echo "Unable to mount squashed initramfs image"
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fi
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for file in $SQUASHED_MNT; do
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lowerdir=$SQUASH_MNT/$file
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workdir=/squash/overlay-work/$file
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upperdir=/$file
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mntdir=/$file
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mkdir -m 0755 -p $workdir
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mkdir -m 0755 -p $mntdir
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mount -t overlay overlay -o\
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lowerdir=$lowerdir,upperdir=$upperdir,workdir=$workdir $mntdir
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echo $mntdir >> $SQUASH_MNT_REC
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done
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