log: fix json-formatted output when file copies are listed (issue4523)

mercurial/cmdutil.py

@@ -1091,8 +1091,8 b' class jsonchangeset(changeset_printer):'
 
             if copies:
                 self.ui.write(',\n  "copies": {%s}' %
-                              ", ".join('"%s": %s' % (j(k), j(copies[k]))
-                                                      for k in copies))
+                              ", ".join('"%s": "%s"' % (j(k), j(v))
+                                                        for k, v in copies))
 
         matchfn = self.matchfn
         if matchfn:

tests/test-log.t

@@ -494,7 +494,23 b' log copies with hardcoded style and with'
   e
   
   
-
+  $ hg log -vC -r4 -Tjson
+  [
+   {
+    "rev": 4,
+    "node": "7e4639b4691b9f84b81036a8d4fb218ce3c5e3a3",
+    "branch": "default",
+    "phase": "draft",
+    "user": "test",
+    "date": [5, 0],
+    "desc": "e",
+    "bookmarks": [],
+    "tags": ["tip"],
+    "parents": ["2ca5ba7019804f1f597249caddf22a64d34df0ba"],
+    "files": ["dir/b", "e"],
+    "copies": {"e": "dir/b"}
+   }
+  ]
 
 log copies, non-linear manifest