commands: lock() the repo while unbundling (issue1004)

mercurial/commands.py

@@ -2649,6 +2649,10 b' def unbundle(ui, repo, fname1, *fnames, '
     bundle command.
     """
     fnames = (fname1,) + fnames
+
+    lock = None
+    try:
+        lock = repo.lock()
     for fname in fnames:
         if os.path.exists(fname):
             f = open(fname, "rb")
@@ -2656,6 +2660,8 b' def unbundle(ui, repo, fname1, *fnames, '
             f = urllib.urlopen(fname)
         gen = changegroup.readbundle(f, fname)
         modheads = repo.addchangegroup(gen, 'unbundle', 'bundle:' + fname)
+    finally:
+        del lock
 
     return postincoming(ui, repo, modheads, opts['update'], None)