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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] [-q] [-c <command>] [-w <working directory>] [-- args...]")
-c <command> Command for nixos-rebuild. See 'man nixos-rebuild' (default: switch)
-w <path> Path to your configuration git directory (default: '$RC_CONFIG')
-n DON'T include hostname in tag name
-t <tagname> Custom tag name
-p [<pkgs>] Generate the switch tag in the nixpkgs at <pkgs> as well. (default: '$RC_NIXPKGS')
-f <tag-flags> Flags for git-tag (see 'git tag --help') (default: '$RC_SWITCH_DEFAULT_TAG_FLAGS')
-b Do not call nixos-rebuild at all.
-q Don't pass -Q to nixos-rebuild
-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_rcvars \
"RC_CONFIG - Path of your system configuration (git) directory"\
"RC_NIXPKGS - Path of your nixpkgs clone" \
"RC_SWITCH_DEFAULT_TAG_FLAGS - Default git-tag flags for tagging in system configuration (git) directory"\
"RC_SWITCH_DEFAULT_TAG_FLAGS_NIXPKGS - Default git-tag flags for tagging in nixpkgs"
)
$(help_end "${BASH_SOURCE[0]}")
EOS
}
COMMAND=
ARGS=
WD=$RC_CONFIG
TAG_NAME=
HOSTNAME="$(hostname)"
TAG_NIXPKGS=0
NIXPKGS=$RC_NIXPKGS
TAG_FLAGS="$RC_SWITCH_DEFAULT_TAG_FLAGS"
TAG_FLAGS_NIXPKGS="$RC_SWITCH_DEFAULT_TAG_FLAGS_NIXPKGS"
DONT_BUILD=
QUIET=1
while getopts "c:w:t:nbp:f:qh" OPTION
do
case $OPTION in
c)
COMMAND=$OPTARG
;;
w)
WD=$OPTARG
;;
t)
TAG_NAME=$OPTARG
;;
n)
HOSTNAME=""
;;
p)
if [[ ! -z "$OPTARG" ]]
then
NIXPKGS=$OPTARG
fi
TAG_NIXPKGS=1
;;
f)
TAG_FLAGS=$OPTARG
;;
b)
DONT_BUILD=1
dbg "DONT_BUILD = $DONT_BUILD"
;;
q)
QUIET=0
dbg "QUIET = $QUIET"
;;
h)
usage
exit 1
;;
esac
done
#
# Function to generate the tag at $NIXPKGS as well
#
tag_nixpkgs() {
if [[ ! -d "$1" ]]
then
stderr "'$1' is not a directory, so can't be a nixpkgs clone"
return
fi
commit=$(nixos-version | cut -d . -f 3 | cut -d " " -f 1)
c_txt="Trying to create tag '$TAG_NAME' at '$1' on commit '$commit'"
continue_question "$c_txt" || return
__git "$1" tag $TAG_FLAGS_NIXPKGS "$TAG_NAME" $commit || \
stderr "Could not create tag in nixpkgs clone"
}
dbg "COMMAND = $COMMAND"
dbg "WD = $WD"
dbg "TAG_NAME = $TAG_NAME"
dbg "HOSTNAME = $HOSTNAME"
dbg "NIXPKGS = $NIXPKGS"
dbg "TAG_FLAGS = $TAG_FLAGS"
ARGS=$(echo $* | sed -r 's/(.*)(\-\-(.*)|$)/\2/')
dbg "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"
if [[ -z "$DONT_BUILD" ]]
then
__q="-Q"
[[ $QUIET -eq 0 ]] && __q=""
explain sudo nixos-rebuild $__q $COMMAND $ARGS
REBUILD_EXIT=$?
else
stdout "Do not call nixos-rebuild"
REBUILD_EXIT=0
fi
if [[ $REBUILD_EXIT -eq 0 ]]
then
LASTGEN=$(current_system_generation)
sudo -k
stdout "sudo -k succeeded"
stdout "Last generation was: $LASTGEN"
if [[ -z "$TAG_NAME" ]]
then
if [[ -z "$HOSTNAME" ]]; then TAG_NAME="nixos-$LASTGEN-$COMMAND"
else TAG_NAME="nixos-$HOSTNAME-$LASTGEN-$COMMAND"
fi
fi
__git "$WD" tag $TAG_FLAGS "$TAG_NAME"
if [[ $TAG_NIXPKGS -eq 1 ]]
then
if [[ ! -z "$NIXPKGS" ]]
then
stdout "Trying to generate tag in $NIXPKGS"
tag_nixpkgs "$NIXPKGS"
else
stderr "Do not generate a tag in the nixpkgs clon"
stderr "no NIXPKGS given."
usage
stderr "Continuing..."
fi
else
stdout "nixpkgs tag generating disabled"
fi
else
stderr "Switching failed. Won't executing any further commands."
exit $REBUILD_EXIT
fi
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