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|
#!/bin/sh
rodir=run/initramfs/ro
rwdir=run/initramfs/rw
upper=$rwdir/cow
work=$rwdir/work
cd /
mkdir -p sys proc dev run
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 $m
}
rofs=$(findmtd rofs)
rwfs=$(findmtd rwfs)
rofst=squashfs
rwfst=ext4
echo rofs = $rofs $rofst rwfs = $rwfs $rwfst
if grep -w debug-init-sh /proc/cmdline ||
! mount -o rw /dev/mtdblock${rwfs#mtd} $rwdir -t $rwfst
then
echo Please mount the rw file system on $rwdir from this shell
while ! sulogin && ! test -f /takeover
do
echo getty failed, retrying
done
fi
# Touch /takeover in the above getty to become pid 1
if test -e /takeover
then
export PS1=init#\
exec /bin/sh
fi
mount -o ro /dev/mtdblock${rofs#mtd} $rodir -t $rofst
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 exit
then
echo 'chroot test failed; invoking emergency shell.'
PS1=rescue#\ sulogin
fi
for f in sys dev proc run
do
mount --move $f root/$f
done
# switch_root /root /sbin/init
exec chroot /root /sbin/init
|
