51 lines
1.5 KiB
Bash
Executable File
51 lines
1.5 KiB
Bash
Executable File
#!/bin/sh
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set -euo pipefail
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PATH=/sbin:/bin:/usr/sbin:/usr/bin
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/bin/mount -t proc proc /proc
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/bin/mount -t sysfs sysfs /sys
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grep -w "/dev" /proc/mounts >/dev/null || /bin/mount -t devtmpfs none /dev
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[ -z "${CMDLINE+x}" ] && CMDLINE=`cat /proc/cmdline`
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for arg in $CMDLINE; do
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optarg=`expr "x$arg" : 'x[^=]*=\(.*\)' || echo ''`
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case $arg in
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root=*)
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ROOT_RODEVICE=$optarg ;;
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rootfstype=*)
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ROOT_ROFSTYPE=$optarg ;;
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esac
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done
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ROOT_ROMOUNTPARAMS="-t $ROOT_ROFSTYPE -o noatime,nodiratime $ROOT_RODEVICE"
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if ! /bin/mount $ROOT_ROMOUNTPARAMS /media/rfs/ro 2>/dev/null && \
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[ "x-o bind /" == "x$ROOT_ROMOUNTPARAMS" ] || \
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log "Could not mount $ROOT_RODEVICE, bind mounting..." && \
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! /bin/mount -o bind / /media/rfs/ro; then
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fatal "Could not mount read-only rootfs"
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fi
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if ! /bin/mount -o remount,ro /media/rfs/ro; then
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fatal "Could not remount read-only rootfs as read only"
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fi
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if ! /bin/mount PARTUUID=f1326040-5236-40eb-b683-aaa100a9afcf /media/rfs/rw -t auto -o relatime,nosuid,nodev ; then
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fatal "Could not mount read-write rootfs"
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fi
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mkdir -p /media/rfs/rw/upperdir /media/rfs/rw/work
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/bin/mount -t overlay overlay -o lowerdir=/media/rfs/ro,upperdir=/media/rfs/rw/upperdir,workdir=/media/rfs/rw/work /mnt
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mkdir -p /mnt/media/rfs/ro /mnt/media/rfs/rw
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/bin/mount -n --move /media/rfs/ro /mnt/media/rfs/ro
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/bin/mount -n --move /media/rfs/rw /mnt/media/rfs/rw
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/bin/mount -n --move /proc /mnt/proc
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/bin/mount -n --move /sys /mnt/sys
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/bin/mount -n --move /dev /mnt/dev
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cd /mnt
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exec chroot /mnt /sbin/init || fatal "Couldn't chroot, dropping to shell"
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