hg: raise Abort on invalid path

Currently, some os.path functions when opening repositories may
raise an uncaught TypeError or ValueError if the path is invalid.

Let's catch these exceptions and turn them into an Abort for
convenience.

Differential Revision: https://phab.mercurial-scm.org/D5772

mercurial/hg.py

@@ -38,6 +38,7 b' from . import ('
     narrowspec,
     node,
     phases,
+    pycompat,
     repository as repositorymod,
     scmutil,
     sshpeer,
@@ -57,7 +58,15 b" sharedbookmarks = 'bookmarks'"
 
 def _local(path):
     path = util.expandpath(util.urllocalpath(path))
-    return (os.path.isfile(path) and bundlerepo or localrepo)
+
+    try:
+        isfile = os.path.isfile(path)
+    # Python 2 raises TypeError, Python 3 ValueError.
+    except (TypeError, ValueError) as e:
+        raise error.Abort(_('invalid path %s: %s') % (
+            path, pycompat.bytestr(e)))
+
+    return isfile and bundlerepo or localrepo
 
 def addbranchrevs(lrepo, other, branches, revs):
     peer = other.peer() # a courtesy to callers using a localrepo for other

mercurial/ui.py

@@ -2051,7 +2051,11 b' class path(object):'
         This is its own function so that extensions can change the definition of
         'valid' in this case (like when pulling from a git repo into a hg
         one)."""
+        try:
         return os.path.isdir(os.path.join(path, '.hg'))
+        # Python 2 may return TypeError. Python 3, ValueError.
+        except (TypeError, ValueError):
+            return False
 
     @property
     def suboptions(self):

tests/test-remotefilelog-gc.t

@@ -107,6 +107,6 b''
 # Test that warning is displayed when the repo path is malformed
 
   $ printf "asdas\0das" >> $CACHEDIR/repos
-  $ hg gc 2>&1 | head -n2
-  warning: malformed path: * (glob)
-  Traceback (most recent call last):
+  $ hg gc
+  abort: invalid path asdas\x00da: stat() argument 1 must be encoded string without null bytes, not str (esc)
+  [255]