362 lines
9.4 KiB
Bash
362 lines
9.4 KiB
Bash
#! @shell@
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targetRoot=/mnt-root
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export LD_LIBRARY_PATH=@extraUtils@/lib
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export PATH=@extraUtils@/bin:@extraUtils@/sbin
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fail() {
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if [ -n "$panicOnFail" ]; then exit 1; fi
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# If starting stage 2 failed, allow the user to repair the problem
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# in an interactive shell.
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cat <<EOF
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An error occured in stage 1 of the boot process, which must mount the
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root filesystem on \`$targetRoot' and then start stage 2. Press one
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of the following keys:
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i) to launch an interactive shell;
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f) to start an interactive shell having pid 1 (needed if you want to
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start stage 2's init manually); or
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*) to ignore the error and continue.
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EOF
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read reply
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# Get the console from the kernel cmdline
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console=tty1
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for o in $(cat /proc/cmdline); do
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case $o in
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console=*)
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set -- $(IFS==; echo $o)
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params=$2
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set -- $(IFS=,; echo $params)
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console=$1
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;;
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esac
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done
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case $reply in
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f)
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exec setsid @shell@ < /dev/$console >/dev/$console 2>/dev/$console ;;
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i)
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echo "Starting interactive shell..."
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setsid @shell@ < /dev/$console >/dev/$console 2>/dev/$console || fail
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;;
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*)
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echo "Continuing...";;
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esac
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}
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trap 'fail' 0
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# Print a greeting.
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echo
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echo "[1;32m<<< NixOS Stage 1 >>>[0m"
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echo
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# Mount special file systems.
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mkdir -p /etc
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touch /etc/fstab # to shut up mount
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touch /etc/mtab # to shut up mke2fs
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mkdir -p /proc
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mount -t proc none /proc
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mkdir -p /sys
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mount -t sysfs none /sys
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mount -t devtmpfs -o "size=@devSize@" none /dev
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mkdir -p /run
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mount -t tmpfs -o "mode=0755,size=@runSize@" none /run
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mount -t securityfs none /sys/kernel/security
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# Process the kernel command line.
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export stage2Init=/init
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for o in $(cat /proc/cmdline); do
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case $o in
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init=*)
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set -- $(IFS==; echo $o)
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stage2Init=$2
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;;
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debugtrace)
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# Show each command.
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set -x
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;;
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debug1) # stop right away
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fail
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;;
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debug1devices) # stop after loading modules and creating device nodes
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debug1devices=1
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;;
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debug1mounts) # stop after mounting file systems
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debug1mounts=1
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;;
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stage1panic=1)
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panicOnFail=1
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;;
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root=*)
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# If a root device is specified on the kernel command
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# line, make it available through the symlink /dev/root.
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# Recognise LABEL= and UUID= to support UNetbootin.
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set -- $(IFS==; echo $o)
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if [ $2 = "LABEL" ]; then
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root="/dev/disk/by-label/$3"
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elif [ $2 = "UUID" ]; then
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root="/dev/disk/by-uuid/$3"
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else
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root=$2
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fi
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ln -s "$root" /dev/root
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;;
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esac
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done
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# Load the required kernel modules.
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mkdir -p /lib
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ln -s @modulesClosure@/lib/modules /lib/modules
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echo @extraUtils@/bin/modprobe > /proc/sys/kernel/modprobe
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for i in @kernelModules@; do
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echo "loading module $(basename $i)..."
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modprobe $i || true
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done
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# Create device nodes in /dev.
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echo "running udev..."
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export UDEV_CONFIG_FILE=@udevConf@
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mkdir -p /dev/.udev # !!! bug in udev?
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mkdir -p /dev/.mdadm
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udevd --daemon
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udevadm trigger --action=add
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udevadm settle || true
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modprobe scsi_wait_scan || true
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udevadm settle || true
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# XXX: Use case usb->lvm will still fail, usb->luks->lvm is covered
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@preLVMCommands@
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echo "starting device mapper and LVM..."
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lvm vgchange -ay
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if test -n "$debug1devices"; then fail; fi
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@postDeviceCommands@
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# Try to resume - all modules are loaded now, and devices exist
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if test -e /sys/power/tuxonice/resume; then
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if test -n "$(cat /sys/power/tuxonice/resume)"; then
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echo 0 > /sys/power/tuxonice/user_interface/enabled
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echo 1 > /sys/power/tuxonice/do_resume || echo "failed to resume..."
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fi
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fi
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if test -e /sys/power/resume -a -e /sys/power/disk; then
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echo "@resumeDevice@" > /sys/power/resume 2> /dev/null || echo "failed to resume..."
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echo shutdown > /sys/power/disk
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fi
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# Return true if the machine is on AC power, or if we can't determine
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# whether it's on AC power.
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onACPower() {
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! test -d "/proc/acpi/battery" ||
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! ls /proc/acpi/battery/BAT[0-9]* > /dev/null 2>&1 ||
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! cat /proc/acpi/battery/BAT*/state | grep "^charging state" | grep -q "discharg"
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}
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# Check the specified file system, if appropriate.
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checkFS() {
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local device="$1"
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local fsType="$2"
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# Only check block devices.
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if [ ! -b "$device" ]; then return 0; fi
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# Don't check ROM filesystems.
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if [ "$fsType" = iso9660 -o "$fsType" = udf ]; then return 0; fi
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# If we couldn't figure out the FS type, then skip fsck.
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if [ "$fsType" = auto ]; then
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echo 'cannot check filesystem with type "auto"!'
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return 0
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fi
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# Optionally, skip fsck on journaling filesystems. This option is
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# a hack - it's mostly because e2fsck on ext3 takes much longer to
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# recover the journal than the ext3 implementation in the kernel
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# does (minutes versus seconds).
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if test -z "@checkJournalingFS@" -a \
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\( "$fsType" = ext3 -o "$fsType" = ext4 -o "$fsType" = reiserfs \
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-o "$fsType" = xfs -o "$fsType" = jfs \)
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then
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return 0
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fi
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# Don't run `fsck' if the machine is on battery power. !!! Is
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# this a good idea?
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if ! onACPower; then
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echo "on battery power, so no \`fsck' will be performed on \`$device'"
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return 0
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fi
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echo "checking $device..."
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fsck -V -a "$device"
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fsckResult=$?
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if test $(($fsckResult | 2)) = $fsckResult; then
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echo "fsck finished, rebooting..."
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sleep 3
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reboot
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fi
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if test $(($fsckResult | 4)) = $fsckResult; then
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echo "$device has unrepaired errors, please fix them manually."
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fail
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fi
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if test $fsckResult -ge 8; then
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echo "fsck on $device failed."
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fail
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fi
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return 0
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}
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# Function for mounting a file system.
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mountFS() {
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local device="$1"
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local mountPoint="$2"
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local options="$3"
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local fsType="$4"
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if [ "$fsType" = auto ]; then
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fsType=$(blkid -o value -s TYPE "$device")
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if [ -z "$fsType" ]; then fsType=auto; fi
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fi
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echo "$device /mnt-root$mountPoint $fsType $options" >> /etc/fstab
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checkFS "$device" "$fsType"
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echo "mounting $device on $mountPoint..."
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mkdir -p "/mnt-root$mountPoint" || true
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# For CIFS mounts, retry a few times before giving up.
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local n=0
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while true; do
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if [ "$fsType" = "nfs" ]; then
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nfsmount "$device" "/mnt-root$mountPoint" && break
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else
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mount "/mnt-root$mountPoint" && break
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fi
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if [ "$fsType" != cifs -o "$n" -ge 10 ]; then fail; break; fi
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echo "retrying..."
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n=$((n + 1))
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done
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}
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# Try to find and mount the root device.
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mkdir /mnt-root
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exec 3< @fsInfo@
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while read -u 3 mountPoint; do
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read -u 3 device
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read -u 3 fsType
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read -u 3 options
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# !!! Really quick hack to support bind mounts, i.e., where the
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# "device" should be taken relative to /mnt-root, not /. Assume
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# that every device that starts with / but doesn't start with /dev
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# is a bind mount.
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pseudoDevice=
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case $device in
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/dev/*)
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;;
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//*)
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# Don't touch SMB/CIFS paths.
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pseudoDevice=1
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;;
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/*)
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device=/mnt-root$device
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;;
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*)
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# Not an absolute path; assume that it's a pseudo-device
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# like an NFS path (e.g. "server:/path").
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pseudoDevice=1
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;;
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esac
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# USB storage devices tend to appear with some delay. It would be
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# great if we had a way to synchronously wait for them, but
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# alas... So just wait for a few seconds for the device to
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# appear. If it doesn't appear, try to mount it anyway (and
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# probably fail). This is a fallback for non-device "devices"
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# that we don't properly recognise.
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if test -z "$pseudoDevice" -a ! -e $device; then
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echo -n "waiting for device $device to appear..."
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for try in $(seq 1 20); do
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sleep 1
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if test -e $device; then break; fi
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echo -n "."
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done
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echo
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fi
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# Wait once more for the udev queue to empty, just in case it's
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# doing something with $device right now.
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udevadm settle || true
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mountFS "$device" "$mountPoint" "$options" "$fsType"
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done
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@postMountCommands@
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# Stop udevd.
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udevadm control --exit || true
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# Kill any remaining processes, just to be sure we're not taking any
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# with us into stage 2.
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pkill -9 -v 1
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if test -n "$debug1mounts"; then fail; fi
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# Restore /proc/sys/kernel/modprobe to its original value.
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echo /sbin/modprobe > /proc/sys/kernel/modprobe
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# Start stage 2. `switch_root' deletes all files in the ramfs on the
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# current root. Note that $stage2Init might be an absolute symlink,
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# in which case "-e" won't work because we're not in the chroot yet.
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if ! test -e "$targetRoot/$stage2Init" -o -L "$targetRoot/$stage2Init"; then
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echo "stage 2 init script ($targetRoot/$stage2Init) not found"
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fail
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fi
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mkdir -m 0755 -p $targetRoot/proc $targetRoot/sys $targetRoot/dev $targetRoot/run
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mount --move /proc $targetRoot/proc
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mount --move /sys $targetRoot/sys
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mount --move /dev $targetRoot/dev
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mount --move /run $targetRoot/run
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exec switch_root "$targetRoot" "$stage2Init"
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fail # should never be reached
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