![Eelco Dolstra](/assets/img/avatar_default.png)
we want to generate the GRUB menu without actually installing GRUB (because Amazon supplies its own pv-grub), and each menu entry requires "root (hd0)". For the first, allow boot.loader.grub.device to be set to "nodev" to indicate that the GRUB menu should be generated without installing GRUB. For the second, add an option boot.loader.grub.extraPerEntryConfig to allow commands to be added to each GRUB menu entry (in this case, "root (hd0)"). svn path=/nixos/trunk/; revision=22712
304 lines
7.7 KiB
Bash
304 lines
7.7 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
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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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case $reply in
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f)
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exec @shell@;;
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i)
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echo "Starting interactive shell..."
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@shell@ || 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' ERR
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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 # to shut up mount
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echo -n > /etc/fstab # idem
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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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# 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)
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panicOnFail=1
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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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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 $i || true
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done
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# Create /dev/null.
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mknod /dev/null c 1 3
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# Try to resume - all modules are loaded now.
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if test -e /sys/power/tuxonice/resume; then
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if test -n "$(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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# 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 control --env=STARTUP=1
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udevadm trigger --action=add
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udevadm settle
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udevadm control --env=STARTUP=
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echo "starting device mapper and LVM..."
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lvm vgscan
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lvm vgchange -ay
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if test -n "$debug1devices"; then fail; fi
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@postDeviceCommands@
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# Return true if the machine is on AC power, or if we can't determine
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# whether it's on AC power.
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onACPower() {
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! test -d "/proc/acpi/battery" ||
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! ls /proc/acpi/battery/BAT[0-9]* > /dev/null 2>&1 ||
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! cat /proc/acpi/battery/BAT*/state | grep "^charging state" | grep -q "discharg"
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}
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# Check the specified file system, if appropriate.
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checkFS() {
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# Only check block devices.
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if ! test -b "$device"; then return 0; fi
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FSTYPE=$(blkid -o value -s TYPE "$device" || true)
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# Don't check ROM filesystems.
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if test "$FSTYPE" = iso9660 -o "$FSTYPE" = udf; then return 0; 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 \`$device'"
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return 0
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fi
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FSTAB_FILE="/etc/mtab" fsck -V -C -a "$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="$4"
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checkFS "$device"
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mkdir -p "/mnt-root$mountPoint" || true
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# For CIFS mounts, retry a few times before giving up.
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local n=0
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while true; do
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if mount -t "$fsType" -o "$options" "$device" /mnt-root$mountPoint; then
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break
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fi
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if [ "$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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mountPoints=(@mountPoints@)
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devices=(@devices@)
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fsTypes=(@fsTypes@)
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optionss=(@optionss@)
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for ((n = 0; n < ${#mountPoints[*]}; n++)); do
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mountPoint=${mountPoints[$n]}
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device=${devices[$n]}
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fsType=${fsTypes[$n]}
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options=${optionss[$n]}
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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 = 0; try < 10; try++)); 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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echo "mounting $device on $mountPoint..."
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mountFS "$device" "$mountPoint" "$options" "$fsType"
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done
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@postMountCommands@
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# Stop udevd.
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kill -- -1
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if test -n "$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. It also moves the /proc, /sys and /dev mounts over to
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# the new 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 $targetRoot/dev
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exec switch_root "$targetRoot" "$stage2Init"
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fail # should never be reached
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