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authorC. McEnroe <june@causal.agency>2020-08-13 20:38:34 -0400
committerC. McEnroe <june@causal.agency>2020-08-14 16:00:34 -0400
commit2050d668af9e9eb2f20aa42c2f27eb0e3c7d182d (patch)
treea3876e8d6d2fb1311fdb594e9fd3153dbfae0cda
parentAdd prospective manual page for spawn (diff)
downloadcatsit-2050d668af9e9eb2f20aa42c2f27eb0e3c7d182d.tar.gz
catsit-2050d668af9e9eb2f20aa42c2f27eb0e3c7d182d.zip
Add tentative implementation of spawn(8)
-rw-r--r--spawn.sh34
1 files changed, 34 insertions, 0 deletions
diff --git a/spawn.sh b/spawn.sh
new file mode 100644
index 0000000..052a7fd
--- /dev/null
+++ b/spawn.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+set -eu
+
+die() {
+	echo "${0}:" "$@" >&2
+	exit 1
+}
+
+: ${SPAWND_PIPE:=/var/run/spawnd.pipe}
+
+while getopts 'c:' opt; do
+	case "${opt}" in
+		(c) SPAWND_PIPE=$OPTARG;;
+		(?) exit 1;;
+	esac
+done
+shift $((OPTIND - 1))
+
+if ! [ -p "${SPAWND_PIPE}" ]; then
+	die "${SPAWND_PIPE} is not a named pipe"
+fi
+
+[ $# -lt 1 ] && die 'action required'
+[ $# -lt 2 ] && die 'service name required'
+
+action=$(echo "${1}" | tr 'A-Z' 'a-z')
+for valid in start stop restart status $(kill -l | tr 'A-Z' 'a-z'); do
+	[ "${action}" = "${valid}" ] && break
+done
+if [ "${action}" != "${valid}" ]; then
+	die "${action} is not a valid action or signal"
+fi
+
+echo "$@" > "${SPAWND_PIPE}"