Catch a RepoError if an hg clone fails and print a nice message inste…

…ad of a freaky traceback.

Fixes #50.

gitifyhg.py

@@ -38,7 +38,7 @@
 
 from mercurial.ui import ui
 from mercurial.context import memctx, memfilectx
-from mercurial.error import Abort
+from mercurial.error import Abort, RepoError
 from mercurial import encoding
 from mercurial.bookmarks import listbookmarks, readcurrent, pushbookmark
 from mercurial.util import sha1
@@ -311,8 +311,15 @@ def build_repo(self, url):
 
         local_path = self.remotedir.joinpath('clone')
         if not local_path.exists():
-            self.peer, dstpeer = hg.clone(myui, {}, url.encode('utf-8'),
-                local_path.encode('utf-8'), update=False, pull=True)
+            try:
+                self.peer, dstpeer = hg.clone(myui, {}, url.encode('utf-8'),
+                    local_path.encode('utf-8'), update=False, pull=True)
+            except (RepoError, Abort) as e:
+                sys.stderr.write("abort: %s\n" % e)
+                if e.hint:
+                    sys.stderr.write("(%s)\n" % e.hint)
+                sys.exit(-1)
+
             self.repo = dstpeer.local()
         else:
             self.repo = hg.repository(myui, local_path.encode('utf-8'))

test/test_clone.py

@@ -447,3 +447,11 @@ def test_clone_replace_dir_by_symlink(git_dir, hg_repo):
 
     assert p('dir_or_link').isfile()
     assert p('dir_or_link').islink()
+
+
+def test_clone_remote_fail(git_dir):
+    # Ensure it has an error message instead of a exception if you try
+    # to clone something which cannot be cloned.
+    err = sh.git.clone("gitifyhg::ssh://hg@hg.example.domain/repo",
+        _ok_code=128).stderr
+    assert "Traceback" not in err