nixpkgs-suyu/modules/system/activation/switch-to-configuration.sh

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#! @shell@
set -e
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin:$i/sbin; done
action="$1"
if ! test -e /etc/NIXOS; then
echo "This is not a NixOS installation (/etc/NIXOS) is missing!"
exit 1
fi
if test -z "$action"; then
cat <<EOF
Usage: $0 [switch|boot|test]
switch: make the configuration the boot default and activate now
boot: make the configuration the boot default
test: activate the configuration, but don't make it the boot default
EOF
exit 1
fi
# Install or update the bootloader.
if [ "$action" = "switch" -o "$action" = "boot" ]; then
@installBootLoader@ @out@
fi
# Activate the new configuration.
if [ "$action" != switch -a "$action" != test ]; then exit 0; fi
oldVersion="$(cat /run/current-system/init-interface-version 2> /dev/null || echo "")"
newVersion="$(cat @out@/init-interface-version)"
if [ "$oldVersion" != "$newVersion" ]; then
cat <<EOF
Warning: the new NixOS configuration has an init that is
incompatible with the current configuration. The new configuration
won't take effect until you reboot the system.
EOF
exit 100 # denotes "reboot required" to Charon
fi
# Ignore SIGHUP so that we're not killed if we're running on (say)
# virtual console 1 and we restart the "tty1" job.
trap "" SIGHUP
# Activate the new configuration (i.e., update /etc, make accounts,
# and so on).
echo "activating the configuration..."
@out@/activate @out@
# FIXME: Re-exec systemd if necessary.
# Make systemd reload its jobs.
systemctl daemon-reload
# Signal dbus to reload its configuration.
systemctl reload dbus.service || true