1 files changed, 55 insertions, 0 deletions
diff --git a/docker/in_cron.sh b/docker/in_cron.sh
new file mode 100755
index 0000000..d23ab70
--- /dev/null
+++ b/docker/in_cron.sh
@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "cgitize" project.
+# For details, see https://github.com/egor-tensin/cgitize.
+# Distributed under the MIT License.
+
+set -o errexit -o nounset -o pipefail
+shopt -s inherit_errexit lastpipe
+
+schedule_to_cron() {
+    local schedule
+    for schedule; do
+        case "$schedule" in
+            minutely) echo '* * * * *'    ;;
+            15min)    echo '*/15 * * * *' ;;
+            hourly)   echo '0 * * * *'    ;;
+            daily)    echo '0 0 * * *'    ;;
+            weekly)   echo '0 0 * * 1'    ;;
+            monthly)  echo '0 0 1 * *'    ;;
+            *)
+                echo "$schedule"
+                ;;
+        esac
+    done
+}
+
+setup_cron_task() {
+    local schedule
+    schedule="${SCHEDULE:-once}"
+
+    if [ "$schedule" = once ]; then
+        exec "$@"
+    fi
+
+    schedule="$( schedule_to_cron "$schedule" )"
+
+    if [ -n "${SCHEDULE_ON_START:+x}" ]; then
+        # Run the task once when the container is started.
+        "$@"
+    fi
+
+    local crontab
+    crontab="$schedule"
+    crontab="$crontab$( printf ' %q' "$@" )"
+
+    echo "$crontab" | crontab -
+    exec crond -f
+}
+
+main() {
+    setup_cron_task "$@"
+}
+
+main "$@"