Add a $JOBSERIAL environment variable when jobs run.

[whenjobs.git] / daemon / daemon.ml

diff --git a/daemon/daemon.ml b/daemon/daemon.ml
index fd986fb..a8bd514 100644 (file)
--- a/daemon/daemon.ml
+++ b/daemon/daemon.ml
@@ -18,6 +18,7 @@
 
 open Whenutils
 
+open Big_int
 open Unix
 open Printf
 
@@ -80,7 +81,12 @@ let rec init j d =
   );
 
   (* Handle SIGCHLD to clean up jobs. *)
-  Sys.set_signal Sys.sigchld (Sys.Signal_handle handle_sigchld)
+  Sys.set_signal Sys.sigchld (Sys.Signal_handle handle_sigchld);
+
+  (* Initialize the variables.  XXX Eventually this will be saved
+   * and loaded from a persistent store.
+   *)
+  variables := StringMap.add "JOBSERIAL" (T_int zero_big_int) !variables
 
 and proc_reload_file () =
   if !debug then Syslog.notice "remote call: reload_file";
@@ -210,7 +216,7 @@ and reevaluate_whenjobs jobnames =
   let set = loop StringSet.empty jobnames in
   let jobnames = StringSet.elements set in
   (* Ensure the jobs always run in predictable (name) order. *)
-  let jobnames = List.sort compare jobnames in
+  let jobnames = List.sort compare_jobnames jobnames in
   List.iter run_job
     (List.map (fun jobname -> StringMap.find jobname !jobs) jobnames)
 
@@ -263,7 +269,8 @@ and schedule_next_everyjob () =
     if jobs <> [] then (
       (* Ensure the jobs always run in predictable (name) order. *)
       let jobs =
-        List.sort (fun { job_name = a } { job_name = b } -> compare a b) jobs in
+        List.sort (fun {job_name = a} {job_name = b} -> compare_jobnames a b)
+          jobs in
 
       if !debug then
         Syslog.notice "scheduling job(s) %s to run at %s"
@@ -290,7 +297,18 @@ and string_of_time_t t =
     tm.tm_hour tm.tm_min tm.tm_sec
 
 and run_job job =
-  Syslog.notice "running %s" job.job_name;
+  let () =
+    (* Increment JOBSERIAL. *)
+    let serial =
+      match StringMap.find "JOBSERIAL" !variables with
+      | T_int serial ->
+        let serial = succ_big_int serial in
+        variables := StringMap.add "JOBSERIAL" (T_int serial) !variables;
+        serial
+      | _ -> assert false in
+
+    Syslog.notice "running %s (JOBSERIAL=%s)"
+      job.job_name (string_of_big_int serial) in
 
   (* Create a temporary directory.  The current directory of the job
    * will be in this directory.  The directory is removed when the
@@ -356,5 +374,21 @@ and cleanup_job job dir =
   let cmd = sprintf "rm -rf '%s'" dir in
   ignore (Sys.command cmd)
 
+(* Intelligent comparison of job names. *)
+and compare_jobnames name1 name2 =
+  try
+    let len1 = String.length name1
+    and len2 = String.length name2 in
+    if len1 > 4 && len2 > 4 &&
+      String.sub name1 0 4 = "job$" && String.sub name2 0 4 = "job$"
+    then (
+      let i1 = int_of_string (String.sub name1 4 (len1-4)) in
+      let i2 = int_of_string (String.sub name2 4 (len2-4)) in
+      compare i1 i2
+    )
+    else raise Not_found
+  with _ ->
+    compare name1 name2
+
 let main_loop () =
   Unixqueue.run esys