1 files changed, 96 insertions, 0 deletions
diff --git a/sysusers.generate-pre.sh b/sysusers.generate-pre.sh
new file mode 100644
index 0000000..4a87d53
--- /dev/null
+++ b/sysusers.generate-pre.sh
@@ -0,0 +1,96 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: true; tab-width: 4; -*-
+
+# This script turns sysuser.d files into scriptlets mandated by Fedora
+# packaging guidelines. The general idea is to define users using the
+# declarative syntax but to turn this into traditional scriptlets.
+
+user() {
+	user="$1"
+	uid="$2"
+	desc="$3"
+	group="$4"
+	home="$5"
+	shell="$6"
+
+	[ "$desc" = '-' ] && desc=
+	{ [ "$home" = '-' ] || [ "$home" = '' ]; } && home=/
+	{ [ "$shell" = '-' ] || [ "$shell" = '' ]; } && shell=/usr/sbin/nologin
+
+	if [ "$uid" = '-' ] || [ "$uid" = '' ]; then
+		cat <<-EOF
+		getent passwd '$user' >/dev/null || \\
+		    useradd -r -g ${group@Q} -d ${home@Q} -s ${shell@Q} -c ${desc@Q} ${user@Q} || :
+		EOF
+	else
+		cat <<-EOF
+		if ! getent passwd ${user@Q} >/dev/null; then
+		    if ! getent passwd ${uid@Q} >/dev/null; then
+		        useradd -r -u ${uid@Q} -g ${group@Q} -d ${home@Q} -s ${shell@Q} -c ${desc@Q} ${user@Q} || :
+		    else
+		        useradd -r -g ${group@Q} -d ${home@Q} -s ${shell@Q} -c ${desc@Q} ${user@Q} || :
+		    fi
+		fi
+
+		EOF
+	fi
+}
+
+group() {
+	group="$1"
+	gid="$2"
+
+	if [ "$gid" = '-' ]; then
+		cat <<-EOF
+		getent group ${group@Q} >/dev/null || groupadd -r ${group@Q} || :
+		EOF
+	else
+		cat <<-EOF
+		getent group ${group@Q} >/dev/null || groupadd -f -g ${gid@Q} -r ${group@Q} || :
+		EOF
+	fi
+}
+
+usermod() {
+	user="$1"
+	group="$2"
+
+	cat <<-EOF
+	if getent group ${group@Q} >/dev/null; then
+	    usermod -a -G ${group@Q} '$user' || :
+	fi
+	EOF
+}
+
+parse() {
+	while read -r line || [ -n "$line" ] ; do
+		{ [ "${line:0:1}" = '#' ] || [ "${line:0:1}" = ';' ]; } && continue
+		line="${line## *}"
+		[ -z "$line" ] && continue
+		eval "arr=( $line )"
+		case "${arr[0]}" in
+			('u')
+				if [[ "${arr[2]}" == *":"* ]]; then
+					user "${arr[1]}" "${arr[2]%:*}" "${arr[3]}" "${arr[2]#*:}" "${arr[4]}" "${arr[5]}"
+				else
+					group "${arr[1]}" "${arr[2]}"
+					user "${arr[1]}" "${arr[2]}" "${arr[3]}" "${arr[1]}" "${arr[4]}" "${arr[5]}"
+				fi
+				;;
+			('g')
+				group "${arr[1]}" "${arr[2]}"
+				;;
+			('m')
+				group "${arr[2]}" "-"
+				user "${arr[1]}" "-" "" "${arr[1]}" "" ""
+				usermod "${arr[1]}" "${arr[2]}"
+				;;
+		esac
+	done
+}
+
+for fn in "$@"; do
+	[ -e "$fn" ] || continue
+	echo "# generated from $(basename "$fn")"
+	parse <"$fn"
+done