blob: bc7138cf12f18c646025e1f9f98c5b2f9c231909 [file] [log] [blame]
#!/bin/sh
fslist="proc sys dev run"
rodir=run/initramfs/ro
rwdir=run/initramfs/rw
upper=$rwdir/cow
work=$rwdir/work
cd /
mkdir -p $fslist
mount dev dev -tdevtmpfs
mount sys sys -tsysfs
mount proc proc -tproc
if ! grep run proc/mounts
then
mount tmpfs run -t tmpfs -o mode=755,nodev
fi
mkdir -p $rodir $rwdir
cp -rp init shutdown update whitelist bin sbin usr lib etc var run/initramfs
# To start a interactive shell with job control at this point, run
# getty 38400 ttyS4
findmtd() {
m=$(grep -xl "$1" /sys/class/mtd/*/name)
m=${m%/name}
m=${m##*/}
echo $m
}
env=$(findmtd u-boot-env)
if test -n $env
then
ln -s /dev/$env /run/mtd:u-boot-env
cp /run/mtd:u-boot-env /run/fw_env
fi
rofs=$(findmtd rofs)
rwfs=$(findmtd rwfs)
rodev=/dev/mtdblock${rofs#mtd}
rwdev=/dev/mtdblock${rwfs#mtd}
rofst=squashfs
rwfst=ext4
roopts=ro
rwopts=rw
init=/sbin/init
echo rofs = $rofs $rofst rwfs = $rwfs $rwfst
if grep -w debug-init-sh /proc/cmdline ||
! mount $rwdev $rwdir -t $rwfst -o $rwopts
then
echo Please mount the rw file system on $rwdir from this shell
while ! sulogin && ! test -f /takeover
do
echo getty failed, retrying
done
fi
# Touch /takeover in the above getty to become pid 1
if test -e /takeover
then
export PS1=init#\
exec /bin/sh
fi
mount $rodev $rodir -t $rofst -o $roopts
rm -rf $work
mkdir -p $upper
mkdir -p $work
mount -t overlay -o lowerdir=$rodir,upperdir=$upper,workdir=$work cow /root
if ! chroot /root /bin/sh -c "test -x '$init' -a -s '$init'"
then
echo "Unable to confirm /sbin/init is an executable non-empty file."
echo "Change Root test failed! Invoking emergency shell."
PS1=rescue#\ sulogin
fi
for f in $fslist
do
mount --move $f root/$f
done
# switch_root /root $init
exec chroot /root $init