127 lines
3.3 KiB
Bash
127 lines
3.3 KiB
Bash
#!/bin/sh
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PATH=/usr/bin:/usr/sbin
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export PATH
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problem()
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{
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printf "Encountered a problem!\n\nDropping you to a shell.\n\n"
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sh
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}
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no_device()
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{
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printf "The device %s, which is supposed to contain the\n" $1
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printf "root file system, does not exist.\n"
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printf "Please fix this problem and exit this shell.\n\n"
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}
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no_mount()
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{
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printf "Could not mount device %s\n" $1
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printf "Sleeping forever. Please reboot and fix the kernel command line.\n\n"
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printf "Maybe the device is formatted with an unsupported file system?\n\n"
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printf "Or maybe filesystem type autodetection went wrong, in which case\n"
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printf "you should add the rootfstype=... parameter to the kernel command line.\n\n"
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printf "Available partitions:\n"
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}
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do_mount_root()
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{
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mkdir /.root
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[ -n "$rootflags" ] && rootflags="$rootflags,"
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rootflags="$rootflags$ro"
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case "$root" in
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/dev/* ) device=$root ;;
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UUID=* ) eval $root; device="/dev/disk/by-uuid/$UUID" ;;
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PARTUUID=*) eval $root; device="/dev/disk/by-partuuid/$PARTUUID" ;;
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LABEL=* ) eval $root; device="/dev/disk/by-label/$LABEL" ;;
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"" ) echo "No root device specified." ; problem ;;
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esac
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while [ ! -b "$device" ] ; do
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no_device $device
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problem
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done
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if ! mount -n -t "$rootfstype" -o "$rootflags" "$device" /.root ; then
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no_mount $device
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cat /proc/partitions
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while true ; do sleep 10000 ; done
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else
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echo "Successfully mounted device $root"
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fi
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}
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do_try_resume()
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{
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case "$resume" in
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UUID=* ) eval $resume; resume="/dev/disk/by-uuid/$UUID" ;;
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LABEL=*) eval $resume; resume="/dev/disk/by-label/$LABEL" ;;
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esac
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if $noresume || ! [ -b "$resume" ]; then return; fi
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ls -lH "$resume" | ( read x x x x maj min x
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echo -n ${maj%,}:$min > /sys/power/resume )
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}
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init=/sbin/init
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root=
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rootdelay=
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rootfstype=auto
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ro="ro"
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rootflags=
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device=
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resume=
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noresume=false
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mount -n -t devtmpfs devtmpfs /dev
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mount -n -t proc proc /proc
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mount -n -t sysfs sysfs /sys
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mount -n -t tmpfs tmpfs /run
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read -r cmdline < /proc/cmdline
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for param in $cmdline ; do
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case $param in
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init=* ) init=${param#init=} ;;
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root=* ) root=${param#root=} ;;
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rootdelay=* ) rootdelay=${param#rootdelay=} ;;
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rootfstype=*) rootfstype=${param#rootfstype=} ;;
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rootflags=* ) rootflags=${param#rootflags=} ;;
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resume=* ) resume=${param#resume=} ;;
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noresume ) noresume=true ;;
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ro ) ro="ro" ;;
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rw ) ro="rw" ;;
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esac
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done
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# udevd location depends on version
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if [ -x /sbin/udevd ]; then
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UDEVD=/sbin/udevd
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elif [ -x /lib/udev/udevd ]; then
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UDEVD=/lib/udev/udevd
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elif [ -x /lib/systemd/systemd-udevd ]; then
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UDEVD=/lib/systemd/systemd-udevd
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else
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echo "Cannot find udevd nor systemd-udevd"
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problem
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fi
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${UDEVD} --daemon --resolve-names=never
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udevadm trigger
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udevadm settle
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if [ -f /etc/mdadm.conf ] ; then mdadm -As ; fi
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if [ -x /sbin/vgchange ] ; then /sbin/vgchange -a y > /dev/null ; fi
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if [ -n "$rootdelay" ] ; then sleep "$rootdelay" ; fi
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do_try_resume # This function will not return if resuming from disk
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do_mount_root
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killall -w ${UDEVD##*/}
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exec switch_root /.root "$init" "$@"
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