Simplify CLI by requiring explicit job names.

Job names are derived from job type + user-defined name in config file
CLI now has subcommands corresponding 1:1 to the config file sections:

        push,pull,autosnap,prune

A subcommand always expects a job name, thus executes exactly one job.

Dict-style syntax also used for PullACL and Sink sections.

jobrun package is currently only used for autosnap, all others need to
be invoked repeatedly via external tool.
Plan is to re-integrate jobrun in an explicit daemon-mode (subcommand).

cmd/prune.go

@@ -29,35 +29,29 @@ func init() {
 
 func cmdPrune(cmd *cobra.Command, args []string) {
 
-	jobFailed := false
-
-	log.Printf("retending...")
-
-	for _, prune := range conf.Prunes {
-
-		if pruneArgs.job == "" || pruneArgs.job == prune.Name {
-			log.Printf("Beginning prune job:\n%s", prune)
-			ctx := PruneContext{prune, time.Now(), pruneArgs.dryRun}
-			err := doPrune(ctx, log)
-			if err != nil {
-				jobFailed = true
-				log.Printf("Prune job failed with error: %s", err)
-			}
-			log.Printf("\n")
-
-		}
-
+	if len(args) < 1 {
+		log.Printf("must specify exactly one job as positional argument")
+		os.Exit(1)
 	}
 
-	if jobFailed {
-		log.Printf("At least one job failed with an error. Check log for details.")
+	job, ok := conf.Prunes[args[0]]
+	if !ok {
+		log.Printf("could not find prune job: %s", args[0])
+		os.Exit(1)
+	}
+
+	log.Printf("Beginning prune job:\n%s", job)
+	ctx := PruneContext{job, time.Now(), pruneArgs.dryRun}
+	err := doPrune(ctx, log)
+	if err != nil {
+		log.Printf("Prune job failed with error: %s", err)
 		os.Exit(1)
 	}
 
 }
 
 type PruneContext struct {
-	Prune  Prune
+	Prune  *Prune
 	Now    time.Time
 	DryRun bool
 }