run fietscron regularly inside container

1 files changed, 42 insertions, 0 deletions

diff --git a/container/cron.py b/container/cron.py
new file mode 100644
index 0000000..47aeaa9
--- /dev/null
+++ b/container/cron.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+import os
+import sys
+import datetime
+import subprocess
+import time
+
+SLEEPY_TIME = datetime.timedelta(hours=1)
+SLEEPY_BATCH = datetime.timedelta(minutes=10)
+LOGFILE = "/fietsboek/fietscron.log"
+
+pid = os.fork()
+if pid > 0:
+    sys.exit(0)
+
+os.setsid()
+
+pid = os.fork()
+if pid > 0:
+    sys.exit(0)
+
+
+def run_fietscron():
+    with open(LOGFILE, "wb") as stdout:
+        subprocess.run(
+            ["/usr/local/bin/fietscron", "-c", "/fietsboek/fietsboek.ini"],
+            stdout=stdout,
+            stderr=subprocess.STDOUT,
+        )
+
+
+def wait(start):
+    wanted_time = start + SLEEPY_TIME
+    while (now := datetime.datetime.now(tz=datetime.UTC)) < wanted_time:
+        to_sleep = min(wanted_time - now, SLEEPY_BATCH)
+        time.sleep(to_sleep.total_seconds())
+
+
+while True:
+    start = datetime.datetime.now(tz=datetime.UTC)
+    run_fietscron()
+    wait(start)