Initial commit - forked from the corresponding Smartfront repositories.

tools/.launcher

@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# Simple launcher script to start some worker scripts within a folder
+# sequentially, in ABC order. The workers' folder is a subfolder of the
+# script's folder with same name as the script, followed by a .d extension.
+# All worker scripts must be executable and must have .sh extension.
+# Other files within the folder will be simply ignored.
+#
+# This script usually get called via symlink, therefore the workers' folder's
+# name comes from the symlink's name. This folder selection may be overridden
+# using an environment variable. Another environment variable may order to
+# waiting a time between workers' launch.
+#
+# Author: Kovács Zoltán <kovacs.zoltan@smartfront.hu>
+#         Kovács Zoltán <kovacsz@marcusconsulting.hu>
+# License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
+# 2023-06-18 v1.0
+# new: forked from the "Smartfront's DOCKER_skeleton" repository.
+# 2021-08-30 v0.1 Initial release
+
+# Accepted environment variables and their defaults.
+SLEEP_BETWEEN=${SLEEP_BETWEEN-"0"}                      # Secs between launches
+WORKER_DIR=${WORKER_DIR:-""}				# Worker's folder
+
+# Messages.
+MSG_MISSINGWRK="Fatal: missing worker's folder"
+
+# Checks the components.
+[[ -z "$(which basename)" ]] && exit 1
+[[ -z "$(which dirname)"  ]] && exit 1
+[[ -z "$(which printf)"   ]] && exit 1
+[[ -z "$(which sleep)"    ]] && exit 1
+# Where I'm?
+SCRPATH="$( cd -P "$(dirname "$0" )" && echo "$PWD" )" #"
+
+# Checks the worker's folder.
+[[ -z "$WORKER_DIR" ]] && WORKER_DIR="$SCRPATH/$(basename "$0").d"
+if [ -z "$WORKER_DIR" -o ! -d "$WORKER_DIR" ]; then
+    echo "$MSG_MISSINGWRK $WORKER_DIR" >&2; exit 1
+fi
+
+# Converts the (optional) time parameter to float.
+SLEEP_BETWEEN=$(printf '%.2f' "$SLEEP_BETWEEN" 2>/dev/null)
+
+# Enumerates the workers.
+WORKERS="$(cd "$WORKER_DIR"; ls -1 *.sh 2>/dev/null)"
+for worker in $WORKERS ""
+do
+    # Safety first...
+    if [ -n "$worker" -a -x "$WORKER_DIR/$worker" ]; then
+	# Launches the worker then waits till it finishes.
+	"$WORKER_DIR/$worker" "$@"
+        # Optionally reduces the launch frequency.
+        sleep ${SLEEP_BETWEEN//,/.}      # decimal point need
+    fi
+done
+
+# That's all, Folks!