entrypoint: Start secretsocket server if needed

If the `SECRET_SOCKET_PATH` environment variable is not set, or refers
to a non-existent path, then we assume we need to manage the
`secretsocket` server ourselves.

Containerfile

@@ -77,4 +77,4 @@ WORKDIR /var/lib/xactfetch
 
 USER 2468:2468
 
-ENTRYPOINT ["tini", "/entrypoint.sh", "--"]
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

@@ -1,3 +1,17 @@
 #!/bin/sh
 
-exec xvfb-run -e /dev/stderr -s '-screen 0 1920x1080x24 -nolisten unix' xactfetch "$@"
+if [ $$ -eq 1 ]; then
+	exec tini "$0" -- "$@"
+fi
+
+if [ -z "${SECRET_SOCKET_PATH}" ] || [ ! -e "${SECRET_SOCKET_PATH}" ]; then
+	export SECRET_SOCKET_PATH="${SECRET_SOCKET_PATH:-/tmp/.secretsocket}"
+	secretsocket &
+	sspid=$!
+fi
+
+xvfb-run -e /dev/stderr -s '-screen 0 1920x1080x24 -nolisten unix' xactfetch "$@"
+
+if [ -n "${sspid}" ]; then
+	kill $sspid
+fi