nixpkgs/boot/boot-stage-2-init.sh

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#! @shell@
# !!! copied from stage 1; remove duplication
# Print a greeting.
echo
echo "<<< NixOS Stage 2 >>>"
echo
# Set the PATH.
setPath() {
local dirs="$1"
export PATH=/empty
for i in $dirs; do
PATH=$PATH:$i/bin
if test -e $i/sbin; then
PATH=$PATH:$i/sbin
fi
done
}
setPath "@path@"
# Mount special file systems.
needWritableDir() {
if test -n "@readOnlyRoot@"; then
mount -t tmpfs -o "mode=$2" none $1 $3
else
mkdir -m $2 -p $1
fi
}
needWritableDir /etc 0755 -n # to shut up mount
test -e /etc/fstab || touch /etc/fstab # idem
mount -n -t proc none /proc
cat /proc/mounts > /etc/mtab
mkdir -m 0755 -p /etc/nixos
# Process the kernel command line.
for o in $(cat /proc/cmdline); do
case $o in
debugtrace)
# Show each command.
set -x
;;
debug2)
echo "Debug shell called from @out@"
exec @shell@
;;
S|s|single)
# !!! argh, can't pass a startup event to Upstart yet.
exec @shell@
;;
safemode)
safeMode=1
;;
systemConfig=*)
set -- $(IFS==; echo $o)
systemConfig=$2
;;
esac
done
# More special file systems, initialise required directories.
mount -t sysfs none /sys
mount -t tmpfs -o "mode=0755" none /dev
mkdir -m 0755 -p /dev/pts
mount -t devpts none /dev/pts
needWritableDir /tmp 01777
needWritableDir /var 0755
needWritableDir /nix/var 0755
needWritableDir /root 0700
needWritableDir /bin 0755 # for the /bin/sh symlink
if test -d /home ; then
needWritableDir /home 0777
fi
# Miscellaneous boot time cleanup.
rm -rf /var/run
if test -n "$safeMode"; then
mkdir -m 0755 -p /var/run
touch /var/run/safemode
fi
# Create the minimal device nodes needed before we run udev.
mknod -m 0666 /dev/null c 1 3
mknod -m 0644 /dev/urandom c 1 9 # needed for passwd
# Run the script that performs all configuration activation that does
# not have to be done at boot time.
@activateConfiguration@ "$systemConfig"
# Record the boot configuration. !!! Should this be a GC root?
if test -n "$systemConfig"; then
ln -sfn "$systemConfig" /var/run/booted-system
fi
# Ensure that the module tools can find the kernel modules.
export MODULE_DIR=@kernel@/lib/modules/
# Run any user-specified commands.
@shell@ @bootLocal@
resumeDevice="$(cat /sys/power/tuxonice/resume)"
if test -n "$resumeDevice"; then
mkswap "$resumeDevice" || echo 'Failed to clear saved image.'
fi
# Start Upstart's init. We start it through the
# /var/run/current-system symlink indirection so that we can upgrade
# init in a running system by changing the symlink and sending init a
# HUP signal.
export UPSTART_CFG_DIR=/etc/event.d
setPath "@upstartPath@"
exec /var/run/current-system/upstart/sbin/init -v