mirror of
https://github.com/ilyakooo0/nixpkgs.git
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76c74cd7c7
BusyBox doesn't handle the "auto" filesystem type very well: fsck will just ignore such filesystems, and mount will only work properly if the required kernel module is already loaded. Therefore, use blkid to determine the filesystem type. Also generate an /etc/fstab in the initrd rootfs on the fly. This is useful if you're dropped into an emergency shell since it allows you to say "fsck /dev/sda1" or "mount /dev/sda" and have the right thing happen.
372 lines
9.5 KiB
Bash
372 lines
9.5 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 tmpfs -o "mode=0755,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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# Some console devices, for the interactivity
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mknod /dev/console c 5 1
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mknod /dev/tty c 5 0
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mknod /dev/tty1 c 4 1
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mknod /dev/ttyS0 c 4 64
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mknod /dev/ttyS1 c 4 65
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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 $i || true
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done
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# Create /dev/null.
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mknod /dev/null c 1 3
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# Create device nodes in /dev.
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echo "running udev..."
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export UDEV_CONFIG_FILE=@udevConf@
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mkdir -p /dev/.udev # !!! bug in udev?
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mkdir -p /dev/.mdadm
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udevd --daemon
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udevadm trigger --action=add
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udevadm settle || true
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modprobe scsi_wait_scan || true
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udevadm settle || true
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# XXX: Use case usb->lvm will still fail, usb->luks->lvm is covered
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@preLVMCommands@
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echo "starting device mapper and LVM..."
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lvm vgchange -ay
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if test -n "$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 --bind /proc $targetRoot/proc
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mount --bind /sys $targetRoot/sys
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mount --bind /dev $targetRoot/dev
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mount --bind /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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