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#!@bash@/bin/bash
# This code explicitly requires GNU Core Utilities and we therefore
# need to ensure they are prioritized over any other similarly named
# tools on the system.
PATH=@coreutils@/bin:$PATH
set -euo pipefail
function errorEcho() {
>&2 echo "$*"
}
# Attempts to set the HOME_MANAGER_CONFIG global variable.
#
# If no configuration file can be found then this function will print
# an error message and exit with an error code.
function setConfigFile() {
if [[ -v HOME_MANAGER_CONFIG ]] ; then
if [[ ! -e "$HOME_MANAGER_CONFIG" ]] ; then
errorEcho "No configure file found at $HOME_MANAGER_CONFIG"
exit 1
fi
HOME_MANAGER_CONFIG="$(realpath "$HOME_MANAGER_CONFIG")"
return
fi
local confFile
for confFile in "$HOME/.config/nixpkgs/home.nix" \
"$HOME/.nixpkgs/home.nix" ; do
if [[ -e "$confFile" ]] ; then
HOME_MANAGER_CONFIG="$confFile"
return
fi
done
errorEcho "No configuration file found." \
"Please create one at ~/.config/nixpkgs/home.nix"
exit 1
}
function setHomeManagerModulesPath() {
local modulesPath
for modulesPath in "@MODULES_PATH@" \
"$HOME/.config/nixpkgs/home-manager/modules" \
"$HOME/.nixpkgs/home-manager/modules" ; do
if [[ -e "$modulesPath" ]] ; then
export NIX_PATH="$NIX_PATH${NIX_PATH:+:}home-manager=$modulesPath"
return
fi
done
}
function doBuild() {
setConfigFile
setHomeManagerModulesPath
local extraArgs
extraArgs="$1"
for p in "${EXTRA_NIX_PATH[@]}"; do
extraArgs="$extraArgs -I $p"
done
if [[ -v VERBOSE ]]; then
extraArgs="$extraArgs --show-trace"
fi
nix-build $extraArgs \
"@HOME_MANAGER_EXPR_PATH@" \
--argstr confPath "$HOME_MANAGER_CONFIG" \
--argstr confAttr "$HOME_MANAGER_CONFIG_ATTRIBUTE" \
-A activationPackage
}
function doSwitch() {
local generation
local exitCode=0
generation=$(doBuild "--no-out-link") && $generation/activate || exitCode=1
return $exitCode
}
function doListGens() {
pushd "/nix/var/nix/profiles/per-user/$USER" > /dev/null
ls --color=yes -gG --sort time home-manager-*-link \
| cut -d' ' -f 4-
popd > /dev/null
}
function doListPackages() {
local outPath
outPath="$(nix-env -q --out-path | grep -o '/.*home-manager-path$')"
if [[ -n "$outPath" ]] ; then
nix-store -q --references "$outPath" | sed 's/[^-]*-//'
else
errorEcho "No home-manager packages seem to be installed."
fi
}
function doHelp() {
echo "Usage: $0 [OPTION] COMMAND"
echo
echo "Options"
echo
echo " -f FILE The home configuration file."
echo " Default is '~/.config/nixpkgs/home.nix'."
echo " -A ATTRIBUTE Optional attribute that selects a configuration"
echo " expression in the configuration file."
echo " -I PATH Add a path to the Nix expression search path."
echo " -v Verbose output"
echo " -n Do a dry run, only prints what actions would be taken"
echo " -h Print this help"
echo
echo "Commands"
echo " help Print this help"
echo " build Build configuration into result directory"
echo " switch Build and activate configuration"
echo " generations List all home environment generations"
echo " packages List all packages installed in home-manager-path"
}
EXTRA_NIX_PATH=()
HOME_MANAGER_CONFIG_ATTRIBUTE=""
while getopts f:I:A:vnh opt; do
case $opt in
f)
HOME_MANAGER_CONFIG="$OPTARG"
;;
I)
EXTRA_NIX_PATH+=("$OPTARG")
;;
A)
HOME_MANAGER_CONFIG_ATTRIBUTE="$OPTARG"
;;
v)
export VERBOSE=1
;;
n)
export DRY_RUN=1
;;
h)
doHelp
exit 0
;;
*)
errorEcho "Unknown option -$OPTARG"
doHelp >&2
exit 1
;;
esac
done
# Get rid of the options.
shift "$((OPTIND-1))"
cmd="$*"
case "$cmd" in
build)
doBuild ""
;;
switch)
doSwitch
;;
generations)
doListGens
;;
packages)
doListPackages
;;
help|--help)
doHelp
;;
*)
errorEcho "Unknown command: $cmd"
doHelp >&2
exit 1
;;
esac
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