Merge pull request #7 from bryanlatten/feature-script-terminate

Run.sh: allow clean termination from a child run script

Author: Bryan Latten

README.md

@@ -13,3 +13,6 @@ Variable | Example | Description
 
 To inject things into the runtime process, add shell scripts (ending in .sh) into the
 `/run.d` folder. These will be executed during container start.
+
+- If script terminates with a non-zero exit code, container will stop, terminating with the script's exit code, unless...
+- If script terminates with exit code of 99, this will signal the container to stop cleanly. This can be used for multi-stage builds that can be committed

container/root/run.sh

@@ -1,11 +1,33 @@
 #!/bin/bash
 RUN_SCRIPTS=/run.d
+STATUS=0
+
+# Run shell scripts (ending in .sh) in run.d directory
+
+# When .sh run scripts fail (exit non-zero), container run will fail
+# NOTE: if a .sh script exits with 99, this is our stop signal, container will exit cleanly
 
-# Run shell scripts (ending in .sh) in run.d directory, if any
 for file in $RUN_SCRIPTS/*.sh; do
+
   echo "[run.d] executing ${file}"
+
   /bin/bash $file
+
+  STATUS=$?  # Captures exit code from script that was run
+
+  if [[ $STATUS == 99 ]]
+  then
+    echo "[run.d] exit signalled - ${file}"
+    exit # Exit cleanly
+  fi
+
+  if [[ $STATUS != 0 ]]
+  then
+    echo "[run.d] failed executing - ${file}"
+    exit $STATUS
+  fi
+
 done
 
-echo "[nginx] starting (foreground)"
+echo "[nginx] start (foreground)"
 exec /usr/sbin/nginx -g "daemon off;"