backup-status: Implement "--running" option

This option checks if a backup is running at the moment (exit code 0)
or not (exit code 1).

diff --git a/bin/backup-status b/bin/backup-status
index 092931bb8fbf699c70dc30b403dbb1106c57bda2..d7d31762abe64c621b0fe51ec788d4fe55464694 100755 (executable)
--- a/bin/backup-status
+++ b/bin/backup-status
@@ -11,6 +11,7 @@
 #
 
 NAME=`basename $0`
+PIDFILE="/var/run/backup-script.pid"
 QUICK=0
 
 export LC_ALL=C
@@ -73,6 +74,21 @@ Check_Stamp() {
        fi
 }
 
+if [ "$1" == "-r" -o "$1" == "--running" ]; then
+       pid="$(cat "$PIDFILE" 2>/dev/null)"
+       if [ -n "$pid" ]; then
+               if kill -0 "$pid" >/dev/null 2>&1; then
+                       echo "Backup job running with PID $pid."
+                       exit 0
+               else
+                       echo "No backup running (invalid PID $pid in \"$PIDFILE\")."
+                       exit 1
+               fi
+       fi
+       echo "No backup running (no PID file \"$PIDFILE\" found)."
+       exit 1
+fi
+
 if [ "$1" == "-q" ]; then
        QUICK=1
        shift
@@ -81,6 +97,7 @@ fi
 case "$1" in
     "-"*)
        echo "Usage: $NAME [-q] [<system> [<system> [...]]]"
+       echo "       $NAME {-r|--running}"
        exit 2
        ;;
 esac