install

#!/bin/bash
# Generic install script
# Copyright (c) 2023 Jernej Jakob <jernej.jakob@gmail.com>
#
# 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 3 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/>.

: "${PREFIX:="/usr/local"}"
bin_files="certbot_zimbra.sh"
man_files="certbot_zimbra.sh.1"
valid_targets=("bin" "man")

# do not modify anything below this line
targets=()
uninstall=
quiet=

if (( ${BASH_VERSINFO[0]} < 4 || ( ${BASH_VERSINFO[0]} == 4 && ${BASH_VERSINFO[1]} < 3 ) )); then
	printf '%s\n' "This script requires at least bash 4.3 (due to using nameref variables). Exiting." >&2
	exit 1
fi

for arg; do
	case "$arg" in
		-u|--uninstall)
			uninstall=1
			shift
			;;
		-q|--quiet)
			quiet=1
			shift
			;;
		-h|--help)
			cat >&2 <<-EOF
			Usage: install [options...] targets...

			Options:
			  --uninstall	uninstall
			  --quiet	do not print progress to stderr
			  --help	print this help message
			  targets	list of targets to install

			Targets:
			  bin		install binary to \$DESTDIR/\$PREFIX/bin
			  man		install manpage to \$DESTDIR/\$PREFIX/share/man
			  all		install all targets


			Environment:
			  DESTDIR:	current "$DESTDIR" (default "")
			  PREFIX:	current "$PREFIX"  (default "/usr/local")
			EOF
			exit 0
			;;
		-*)
			printf 'Error: unknown option "%s".\n' "$arg" >&2
			exit 1
			;;
		*)
			targets+=("$arg")
			shift
			;;
	esac
done

verb=-v
if (( quiet )); then verb=; fi

if (( EUID != 0 )); then
	printf 'Error: This script must be run as root.\n' >&2
	exit 1
fi

if ! [[ "${targets[*]}" ]]; then
	printf 'Error: nothing to do. Need at least one target.\n' >&2
	exit 1
fi

for target in "${targets[@]}"; do
	if [[ "$target" == "all" ]]; then
		targets=("${valid_targets[@]}")
		break
	fi
	for valid_target in "${valid_targets[@]}"; do
		if [[ "$target" == "$valid_target" ]]; then
			continue 2
		fi
	done

	printf 'Error: target "%s" not valid.\n' "$target" >&2
	exit 1
done

umask 022

for target in "${targets[@]}"; do
	declare -n target_files="${target}_files"

	for f in $target_files; do
		if [[ "$target" == "bin" ]]; then
			if (( uninstall )); then
				rm $verb "$DESTDIR/$PREFIX/bin/$f"
			else
				install $verb -m 0755 -o root -g root "$f" "$DESTDIR/$PREFIX/bin/"
			fi
		fi

		if [[ "$target" == "man" ]]; then
			section="${f##*.}"
			if (( uninstall )); then
				rm $verb "$DESTDIR/$PREFIX/share/man/man$section/$f"
			else
				mkdir $verb -p "$DESTDIR/$PREFIX/share/man/man$section" &&
				install $verb -m 0644 -o root -g root "$f" "$DESTDIR/$PREFIX/share/man/man$section/"
			fi
		fi
	done

	if [[ "$target" == "man" ]]; then
		mandb
	fi
done

exit 0