Merge cockroachdb#89412

89412: gceworker: change cron job to ignore /.active after 2 days r=ajwerner a=ajwerner

It's easy to forget that you've left your gceworker running when you touch /.active. This leads to lots of wasted resources. Here we change the definition of /.active to only count it if the mod time is less than two days ago. This may prove to be frustrating for some folks, but those folks can set the mod time to something in the future or set something else in their enviroment to regularly touch the file. Also, it's easy enough for anybody who is so inclined to change the script to meet their needs on their own gceworker. This should be a more sane default.

Release note: None

Co-authored-by: Andrew Werner <awerner32@gmail.com>

build/bootstrap/autoshutdown.cron.sh

@@ -26,8 +26,24 @@ fi
 FILE=/dev/shm/autoshutdown-count
 COUNT=0
 
+# We ignore active if it has not been modified in the last two
+# days. If one must keep their GCE worker alive longer than that
+# without touching the file in the middle, you can set the mod
+# time on the file into the future. To set a mod time to the future
+# you can use `touch -t [[CC]YY]MMDDhhmm /.active`.
+ACTIVE_FILE=/.active
+AUTO_SHUTDOWN_DURATION=$(( 2 * 24 * 60 * 60 ))
 
-if [ -f /.active ] || w -hs | grep pts | grep -vq "pts/[0-9]* *tmux" || pgrep unison || pgrep -f remote-dev-server.sh; then
+active_exists() {
+  if [[ ! -f "$ACTIVE_FILE" ]]; then
+    return 1
+  fi
+  active=$(date -r "$ACTIVE_FILE" +%s)
+  age=$(( $(date +%s) - $active ))
+  [[ $age -lt $AUTO_SHUTDOWN_DURATION ]]
+}
+
+if active_exists || w -hs | grep pts | grep -vq "pts/[0-9]* *tmux" || pgrep unison || pgrep -f remote-dev-server.sh; then
   # Auto-shutdown is disabled (via /.active) or there is a remote session.
   echo 0 > $FILE
   exit 0
@@ -50,5 +66,6 @@ if [ -z "${1-}" ]; then
   /sbin/shutdown -h
 else
   # Run whatever command was passed on the command line.
+  # shellcheck disable=SC2068
   $@
 fi