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nixpkgs/test/boot-stage-1-init.sh

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#! @shell@
fail() {
# If starting stage 2 failed, start an interactive shell.
echo "Stage 2 failed, starting emergency shell..."
exec @shell@
}
# Print a greeting.
echo
echo "<<< NixOS Stage 1 >>>"
echo
# Set the PATH.
export PATH=/empty
for i in @path@; do
PATH=$PATH:$i/bin
if test -e $i/sbin; then
PATH=$PATH:$i/sbin
fi
done
# Mount special file systems.
mkdir /etc # to shut up mount
touch /etc/fstab # idem
mkdir /proc
mount -t proc none /proc
mkdir /sys
mount -t sysfs none /sys
# Create device nodes in /dev.
source @makeDevices@
# Load some kernel modules.
export MODULE_DIR=@modules@/lib/modules/
modprobe ide-generic
modprobe ide-disk
modprobe ide-cd
# Try to find and mount the root device.
mkdir /mnt
mkdir /mnt/root
echo "mounting the root device..."
if test -n "@autoDetectRootDevice@"; then
# Look for the root device by label.
echo "probing for the NixOS installation CD..."
for i in /sys/devices/*/*/media; do
if test "$(cat $i)" = "cdrom"; then
# Hopefully `drivename' matches the device created in /dev.
devName=/dev/$(cat $(dirname $i)/drivename)
echo " in $devName..."
if mount -o ro -t iso9660 $devName /mnt/root; then
if test -e "/mnt/root/@rootLabel@"; then
found=1
break
fi
umount /mnt/root
fi
fi
done
if test -z "$found"; then
echo "CD not found!"
fail
fi
else
# Hard-coded root device.
mount -o ro "@rootDevice@" /mnt/root
fi
# Start stage 2.
# !!! Note: we can't use pivot_root here (the kernel gods have
# decreed), but we could use run-init from klibc, which deletes all
# files in the initramfs, remounts the target root on /, and chroots.
cd /mnt/root
mount --move . /
umount /proc # cleanup
umount /sys
exec chroot . @stage2Init@
fail