diff options
Diffstat (limited to 'nixos/modules/system/boot/stage-1-init.sh')
| -rw-r--r-- | nixos/modules/system/boot/stage-1-init.sh | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/nixos/modules/system/boot/stage-1-init.sh b/nixos/modules/system/boot/stage-1-init.sh new file mode 100644 index 00000000000..e3e07c08580 --- /dev/null +++ b/nixos/modules/system/boot/stage-1-init.sh @@ -0,0 +1,374 @@ +#! @shell@ + +targetRoot=/mnt-root +console=tty1 + +export LD_LIBRARY_PATH=@extraUtils@/lib +export PATH=@extraUtils@/bin:@extraUtils@/sbin + + +fail() { + if [ -n "$panicOnFail" ]; then exit 1; fi + + # If starting stage 2 failed, allow the user to repair the problem + # in an interactive shell. + cat <<EOF + +An error occured in stage 1 of the boot process, which must mount the +root filesystem on \`$targetRoot' and then start stage 2. Press one +of the following keys: + +EOF + if [ -n "$allowShell" ]; then cat <<EOF + i) to launch an interactive shell + f) to start an interactive shell having pid 1 (needed if you want to + start stage 2's init manually) +EOF + fi + cat <<EOF + r) to reboot immediately + *) to ignore the error and continue +EOF + + read reply + + if [ -n "$allowShell" -a "$reply" = f ]; then + exec setsid @shell@ -c "@shell@ < /dev/$console >/dev/$console 2>/dev/$console" + elif [ -n "$allowShell" -a "$reply" = i ]; then + echo "Starting interactive shell..." + setsid @shell@ -c "@shell@ < /dev/$console >/dev/$console 2>/dev/$console" || fail + elif [ "$reply" = r ]; then + echo "Rebooting..." + reboot -f + else + echo "Continuing..." + fi +} + +trap 'fail' 0 + + +# Print a greeting. +echo +echo "[1;32m<<< NixOS Stage 1 >>>[0m" +echo + + +# Mount special file systems. +mkdir -p /etc +touch /etc/fstab # to shut up mount +touch /etc/mtab # to shut up mke2fs +mkdir -p /proc +mount -t proc none /proc +mkdir -p /sys +mount -t sysfs none /sys +mount -t devtmpfs -o "size=@devSize@" none /dev +mkdir -p /run +mount -t tmpfs -o "mode=0755,size=@runSize@" none /run + + +# Process the kernel command line. +export stage2Init=/init +for o in $(cat /proc/cmdline); do + case $o in + console=*) + set -- $(IFS==; echo $o) + params=$2 + set -- $(IFS=,; echo $params) + console=$1 + ;; + init=*) + set -- $(IFS==; echo $o) + stage2Init=$2 + ;; + boot.trace|debugtrace) + # Show each command. + set -x + ;; + boot.shell_on_fail) + allowShell=1 + ;; + boot.debug1|debug1) # stop right away + allowShell=1 + fail + ;; + boot.debug1devices) # stop after loading modules and creating device nodes + allowShell=1 + debug1devices=1 + ;; + boot.debug1mounts) # stop after mounting file systems + allowShell=1 + debug1mounts=1 + ;; + boot.panic_on_fail|stage1panic=1) + panicOnFail=1 + ;; + root=*) + # If a root device is specified on the kernel command + # line, make it available through the symlink /dev/root. + # Recognise LABEL= and UUID= to support UNetbootin. + set -- $(IFS==; echo $o) + if [ $2 = "LABEL" ]; then + root="/dev/disk/by-label/$3" + elif [ $2 = "UUID" ]; then + root="/dev/disk/by-uuid/$3" + else + root=$2 + fi + ln -s "$root" /dev/root + ;; + esac +done + + +# Load the required kernel modules. +mkdir -p /lib +ln -s @modulesClosure@/lib/modules /lib/modules +echo @extraUtils@/bin/modprobe > /proc/sys/kernel/modprobe +for i in @kernelModules@; do + echo "loading module $(basename $i)..." + modprobe $i || true +done + + +# Create device nodes in /dev. +echo "running udev..." +mkdir -p /etc/udev +ln -sfn @udevRules@ /etc/udev/rules.d +mkdir -p /dev/.mdadm +systemd-udevd --daemon +udevadm trigger --action=add +udevadm settle || true +modprobe scsi_wait_scan || true +udevadm settle || true + + +# Load boot-time keymap before any LVM/LUKS initialization +@extraUtils@/bin/busybox loadkmap < "@busyboxKeymap@" + + +# XXX: Use case usb->lvm will still fail, usb->luks->lvm is covered +@preLVMCommands@ + + +echo "starting device mapper and LVM..." +lvm vgchange -ay + +if test -n "$debug1devices"; then fail; fi + + +@postDeviceCommands@ + + +# Try to resume - all modules are loaded now, and devices exist +if test -e /sys/power/tuxonice/resume; then + if test -n "$(cat /sys/power/tuxonice/resume)"; then + echo 0 > /sys/power/tuxonice/user_interface/enabled + echo 1 > /sys/power/tuxonice/do_resume || echo "failed to resume..." + fi +fi + +if test -e /sys/power/resume -a -e /sys/power/disk; then + echo "@resumeDevice@" > /sys/power/resume 2> /dev/null || echo "failed to resume..." + echo shutdown > /sys/power/disk +fi + + +# Return true if the machine is on AC power, or if we can't determine +# whether it's on AC power. +onACPower() { + ! test -d "/proc/acpi/battery" || + ! ls /proc/acpi/battery/BAT[0-9]* > /dev/null 2>&1 || + ! cat /proc/acpi/battery/BAT*/state | grep "^charging state" | grep -q "discharg" +} + + +# Check the specified file system, if appropriate. +checkFS() { + local device="$1" + local fsType="$2" + + # Only check block devices. + if [ ! -b "$device" ]; then return 0; fi + + # Don't check ROM filesystems. + if [ "$fsType" = iso9660 -o "$fsType" = udf ]; then return 0; fi + + # If we couldn't figure out the FS type, then skip fsck. + if [ "$fsType" = auto ]; then + echo 'cannot check filesystem with type "auto"!' + return 0 + fi + + # Optionally, skip fsck on journaling filesystems. This option is + # a hack - it's mostly because e2fsck on ext3 takes much longer to + # recover the journal than the ext3 implementation in the kernel + # does (minutes versus seconds). + if test -z "@checkJournalingFS@" -a \ + \( "$fsType" = ext3 -o "$fsType" = ext4 -o "$fsType" = reiserfs \ + -o "$fsType" = xfs -o "$fsType" = jfs \) + then + return 0 + fi + + # Don't run `fsck' if the machine is on battery power. !!! Is + # this a good idea? + if ! onACPower; then + echo "on battery power, so no \`fsck' will be performed on \`$device'" + return 0 + fi + + echo "checking $device..." + + fsckFlags= + if test "$fsType" != "btrfs"; then + fsckFlags="-V -a" + fi + fsck $fsckFlags "$device" + fsckResult=$? + + if test $(($fsckResult | 2)) = $fsckResult; then + echo "fsck finished, rebooting..." + sleep 3 + reboot -f + fi + + if test $(($fsckResult | 4)) = $fsckResult; then + echo "$device has unrepaired errors, please fix them manually." + fail + fi + + if test $fsckResult -ge 8; then + echo "fsck on $device failed." + fail + fi + + return 0 +} + + +# Function for mounting a file system. +mountFS() { + local device="$1" + local mountPoint="$2" + local options="$3" + local fsType="$4" + + if [ "$fsType" = auto ]; then + fsType=$(blkid -o value -s TYPE "$device") + if [ -z "$fsType" ]; then fsType=auto; fi + fi + + echo "$device /mnt-root$mountPoint $fsType $options" >> /etc/fstab + + checkFS "$device" "$fsType" + + echo "mounting $device on $mountPoint..." + + mkdir -p "/mnt-root$mountPoint" || true + + # For CIFS mounts, retry a few times before giving up. + local n=0 + while true; do + mount "/mnt-root$mountPoint" && break + if [ "$fsType" != cifs -o "$n" -ge 10 ]; then fail; break; fi + echo "retrying..." + n=$((n + 1)) + done +} + + +# Try to find and mount the root device. +mkdir /mnt-root + +exec 3< @fsInfo@ + +while read -u 3 mountPoint; do + read -u 3 device + read -u 3 fsType + read -u 3 options + + # !!! Really quick hack to support bind mounts, i.e., where the + # "device" should be taken relative to /mnt-root, not /. Assume + # that every device that starts with / but doesn't start with /dev + # is a bind mount. + pseudoDevice= + case $device in + /dev/*) + ;; + //*) + # Don't touch SMB/CIFS paths. + pseudoDevice=1 + ;; + /*) + device=/mnt-root$device + ;; + *) + # Not an absolute path; assume that it's a pseudo-device + # like an NFS path (e.g. "server:/path"). + pseudoDevice=1 + ;; + esac + + # USB storage devices tend to appear with some delay. It would be + # great if we had a way to synchronously wait for them, but + # alas... So just wait for a few seconds for the device to + # appear. If it doesn't appear, try to mount it anyway (and + # probably fail). This is a fallback for non-device "devices" + # that we don't properly recognise. + if test -z "$pseudoDevice" -a ! -e $device; then + echo -n "waiting for device $device to appear..." + for try in $(seq 1 20); do + sleep 1 + if test -e $device; then break; fi + echo -n "." + done + echo + fi + + # Wait once more for the udev queue to empty, just in case it's + # doing something with $device right now. + udevadm settle || true + + mountFS "$device" "$mountPoint" "$options" "$fsType" +done + +exec 3>&- + + +@postMountCommands@ + + +# Stop udevd. +udevadm control --exit || true + +# Kill any remaining processes, just to be sure we're not taking any +# with us into stage 2. unionfs-fuse mounts require the unionfs process. +pkill -9 -v '(1|unionfs)' + + +if test -n "$debug1mounts"; then fail; fi + + +# Restore /proc/sys/kernel/modprobe to its original value. +echo /sbin/modprobe > /proc/sys/kernel/modprobe + + +# Start stage 2. `switch_root' deletes all files in the ramfs on the +# current root. Note that $stage2Init might be an absolute symlink, +# in which case "-e" won't work because we're not in the chroot yet. +if ! test -e "$targetRoot/$stage2Init" -o -L "$targetRoot/$stage2Init"; then + echo "stage 2 init script ($targetRoot/$stage2Init) not found" + fail +fi + +mkdir -m 0755 -p $targetRoot/proc $targetRoot/sys $targetRoot/dev $targetRoot/run + +mount --move /proc $targetRoot/proc +mount --move /sys $targetRoot/sys +mount --move /dev $targetRoot/dev +mount --move /run $targetRoot/run + +exec env -i $(type -P switch_root) "$targetRoot" "$stage2Init" + +fail # should never be reached |