ensure the path to the decree file exists before attempting to write to it

lib/decrees.js

@@ -140,18 +140,25 @@ var Path = require("path");
 var readFileBin = require("./stream-file").readFileBin;
 var Util = require("./common-util");
 var Schedule = require("./schedule");
+var Fse = require("fs-extra");
+var nThen = require("nthen");
 
 Decrees.load = function (Env, cb) {
     Env.scheduleDecree = Env.scheduleDecree || Schedule();
 
-    var decreeName = Path.join(Env.paths.decree, 'decree.ndjson'); // XXX mkdirp
-
-    var stream = Fs.createReadStream(decreeName, {start: 0});
-
-    var handler = Decrees.createLineHandler(Env);
-
     Env.scheduleDecree.blocking('', function (unblock) {
         var done = Util.once(Util.both(cb, unblock));
+        nThen(function (w) {
+            // ensure that the path to the decree log exists
+            Fse.mkdirp(Env.paths.decree, w(function (err) {
+                if (!err) { return; }
+                w.abort();
+                done(err);
+            }));
+        }).nThen(function () {
+            var decreeName = Path.join(Env.paths.decree, 'decree.ndjson');
+            var stream = Fs.createReadStream(decreeName, {start: 0});
+            var handler = Decrees.createLineHandler(Env);
             readFileBin(stream, function (msgObj, next) {
                 var text = msgObj.buff.toString('utf8');
                 try {
@@ -164,6 +171,7 @@ Decrees.load = function (Env, cb) {
                 done(err);
             });
         });
+    });
 };
 
 Decrees.write = function (Env, decree, _cb) {