conf.sh: don't hardcode /etc, get it during build from $(sysconfdir)

1 files changed, 207 insertions, 0 deletions

diff --git a/src/lib/conf.sh.in b/src/lib/conf.sh.in
new file mode 100644
index 0000000..fa66016
--- /dev/null
+++ b/src/lib/conf.sh.in
@@ -0,0 +1,207 @@
+#!/usr/bin/env bash # non-executable, but put this there as a hint to text editors
+# This may be included with or without `set -euE`
+
+#   Copyright (C) 2012-2014 Luke Shumaker <lukeshu@sbcglobal.net>
+#
+#   License: GNU GPLv2+
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+LIBREUSER="${SUDO_USER:-$USER}"
+if [[ $LIBREUSER == $USER ]]; then
+	LIBREHOME=$HOME
+else
+	LIBREHOME="$(eval echo ~$LIBREUSER)"
+fi
+if [[ -z ${XDG_CONFIG_HOME:-} ]]; then
+	export XDG_CONFIG_HOME="${LIBREHOME}/.config"
+fi
+if [[ -z ${XDG_CACHE_HOME:-} ]]; then
+	export XDG_CACHE_HOME="${LIBREHOME}/.cache"
+fi
+
+# Low-level generic functions ##################################################
+
+# Usage: list_files $slug
+# Lists the configuration files to be considered for $slug.
+# Later files should take precedence over earlier files.
+list_files() {
+	local slug=$1
+	case $slug in
+		abs)
+			echo @sysconfdir@/$slug.conf
+			echo "$LIBREHOME/.$slug.conf"
+			;;
+		makepkg)
+			if [[ ${MAKEPKG_CONF:-} != @sysconfdir@/$slug.conf && -r ${MAKEPKG_CONF:-} ]]; then
+				echo "$MAKEPKG_CONF"
+			else
+				echo @sysconfdir@/$slug.conf
+				echo "$LIBREHOME/.$slug.conf"
+			fi
+			;;
+		xbs*)
+			echo @sysconfdir@/xbs/$slug.conf
+			echo "$XDG_CONFIG_HOME/xbs/$slug.conf"
+			;;
+		libretools)
+			echo @sysconfdir@/$slug.conf
+			echo "$XDG_CONFIG_HOME/libretools/$slug.conf"
+			;;
+		*)
+			echo @sysconfdir@/libretools.d/$slug.conf
+			echo "$XDG_CONFIG_HOME/libretools/$slug.conf"
+			;;
+	esac
+}
+
+# Usage: list_envvars $slug
+# Lists the environmental variables that take precedence over the configuration
+# files for $slug.
+list_envvars() {
+	local slug=$1
+	case $slug in
+		makepkg)
+			printf '%s\n' \
+				PKGDEST SRCDEST SRCPKGDEST LOGDEST \
+				BUILDDIR \
+				PKGEXT SRCEXT \
+				GPGKEY PACKAGER
+			;;
+		libretools)
+			printf '%s\n' DIFFPROG
+			;;
+		xbs)
+			printf '%s\n' BUILDSYSTEM
+			;;
+		*) :;;
+	esac
+}
+
+# High-level generic functions #################################################
+
+# Usage: load_files $slug
+# Loads the configuration files for $slug in the proper order.
+load_files() {
+	local slug=$1
+	local var
+	local file
+
+	# Save the existing versions at _VARNAME
+	for var in $(list_envvars $slug); do
+		[[ -n ${!var:-} ]] && eval "_$var=\${$var}"
+	done
+
+	# Load the files
+	for file in $(list_files $slug); do
+		if [[ -r $file ]]; then
+			. "$file" || return 1
+		fi
+	done
+
+	# Restore the _SAVED versions
+	for var in $(list_envvars $slug); do
+		eval "$var=\${_$var:-\${$var:-}}"
+	done
+}
+
+# Usage: check_vars $slug VAR1 VAR2...
+# Check whether the variables listed are properly set.
+# If not, it prints a message saying to set them in the configuration file(s)
+# for $slug.
+check_vars() (
+	local slug=$1; shift
+
+	local ret=0
+
+	local VAR
+	for VAR in "$@"; do
+		if [[ -z ${!VAR:-} ]]; then
+			type print &>/dev/null || . libremessages
+			if [[ $(list_files $slug|wc -l) -gt 1 ]]; then
+				_l print "Configure '%s' in one of:" "$VAR"
+				list_files $slug | sed 's/./  -> &/'
+			else
+				_l print "Configure '%s' in '%s'" "$VAR" "$(list_files $slug)"
+			fi
+			ret=1
+		fi
+	done >&2
+
+	if [[ $ret != 0 ]]; then
+		return 1
+	fi
+)
+
+# Usage: get_var <slug> <var_name> <default_value>
+# Does not work with arrays
+get_var() (
+	set +euE
+	local slug=$1
+	local setting=$2
+	local default=$3
+	load_files "$slug"
+	printf '%s' "${!setting:-${default}}"
+)
+
+# Usage: set_var <slug> <var_name> <value>
+# Does not work with arrays
+set_var() {
+	local slug=$1
+	local key=$2
+	local val=$3
+	local file
+	for file in $(list_files "$slug"|tac); do
+		if [[ -w $file ]]; then
+			sed -i "/^\s*$key=/d" "$file"
+			printf '%s=%q\n' "$key" "$val" >> "$file"
+			return 0
+		fi
+	done
+	return 1
+}
+
+# PKGBUILD (not configuration, per se) #########################################
+
+unset_PKGBUILD() {
+	# This routine is based primarily off of the PKGBUILD(5) man-page,
+	# version 4.1.2, dated 2013-06-18.
+
+	# From the "OPTIONS AND DIRECTIVES" section (in order of mention)
+	unset -v pkgname pkgver
+	unset -f pkgver
+	unset -v pkgrel pkgdesc epoch url license install changelog source
+	unset -v noextract md5sums sha{1,256,384,512}sums groups arch backup
+	unset -v depends makedepends checkdepends optdepends conflicts provides
+	unset -v replaces options
+
+	# From the "PACKAGING FUNCTIONS" section (in order of mention)
+	unset -f package prepare build check
+
+	# From the "PACKAGE SPLITTING" section
+	unset -f $(declare -f|sed -n 's/^\(package_\S*\) ()\s*$/\1/p')
+	unset -v pkgbase
+
+	# These are used by the `librefetch` program
+	unset -v mksource mknoextract mkmd5sums mksha{1,256,384,512}sums
+	unset -v mkdepends
+	unset -f mksource
+}
+
+load_PKGBUILD() {
+	local file=${1:-./PKGBUILD}
+	unset_PKGBUILD
+	CARCH="$(get_var makepkg CARCH "`uname -m`")"
+	. "$file"
+}