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#!/usr/bin/env bash
source $(dirname ${BASH_SOURCE[0]})/nix-utils.sh
CONFIG_DIR=
COMMAND="switch"
usage() {
cat <<EOS
$(help_synopsis "${BASH_SOURCE[0]}" "[-h] [-c <command>] -w <working directory> [-- args...]")
-c <command> Command for nixos-rebuild. See 'man nixos-rebuild'
-w <path> Path to your configuration git directory
-n Include hostname in tag name
-h Show this help and exit
This command helps you rebuilding your system and keeping track
of the system generation in the git directory where your
configuration.nix lives. It generates a tag for each sucessfull
build of a system. So everytime you rebuild your system, this
script creates a tag for you, so you can revert your
configuration.nix to the generation state.
Example usage:
# To rebuild the system with "nixos-rebuild switch" (by -c
# switch), tag in /home/me/config and include the hostname
# in the tag as well (helpful if your configuration is
# shared between hosts).
# Verbosity is on here.
nix-script -v switch -c switch -w /home/me/config -n
Everything after a double dash (--) will be passed to nixos-rebuild as
additional parameters. For example:
nix-script switch -c switch -- -I nixpkgs=/home/user/pkgs
can be used to use your local clone of the nixpkgs repository.
$(help_end)
EOS
}
COMMAND=
ARGS=
WD=
TAG_NAME=
HOSTNAME=""
while getopts "c:w:t:nh" OPTION
do
case $OPTION in
c)
COMMAND=$OPTARG
stdout "COMMAND = $COMMAND"
;;
w)
WD=$OPTARG
stdout "WD = $WD"
;;
t)
TAG_NAME=$OPTARG
stdout "TAG_NAME = $TAG_NAME"
;;
n)
HOSTNAME=$(hostname)
stdout "HOSTNAME = $HOSTNAME"
;;
h)
usage
exit 1
;;
esac
done
ARGS=$(echo $* | sed -r 's/(.*)(\-\-(.*)|$)/\2/')
stdout "ARGS = $ARGS"
[[ -z "$WD" ]] && \
stderr "No configuration git directory." && \
stderr "Won't do anything" && exit 1
[[ ! -d "$WD" ]] && stderr "No directory: $WD" && exit 1
[[ -z "$COMMAND" ]] && COMMAND="switch"
explain sudo nixos-rebuild $COMMAND $ARGS
REBUILD_EXIT=$?
if [[ $REBUILD_EXIT -eq 0 ]]
then
LASTGEN=$(current_system_generation)
sudo -k
if [[ -z "$TAG_NAME" ]]
then
if [[ -z "$HOSTNAME" ]]; then TAG_NAME="nixos-$LASTGEN-$COMMAND"
else TAG_NAME="nixos-$HOSTNAME-$LASTGEN-$COMMAND"
fi
fi
__git "$WD" tag -a "$TAG_NAME"
else
stderr "Switching failed. Won't executing any further commands."
exit $REBUILD_EXIT
fi
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