commands.archive function

[Philip Wrenn]

I am trying to write a simple python script that uses that archive
command to create a file type archive.

Since the archival.archive command will fail if archive type is set to
file and a prefix exists I am not setting the prefix.  The problem is
without a prefix the call to make_filename on line 170 of commands.py
fails.

patlen = len(pat)
TypeError: object of type 'NoneType' has no len()

My example:

u = ui.ui()
repo = hg.repository(u, "/path/to/repo")
tiprev = len(repo) - 1
commands.archive(u,repo,"/path/to/archive/dest", rev=tiprev)

Everything works fine if test prefix before calling make_filename. My
concern is that I may be introducing other problems. If anyone has an
opinion on this I would appreciate hearing it.

-    prefix = cmdutil.make_filename(repo, prefix, node)
+    if prefix:
+        prefix = cmdutil.make_filename(repo, prefix, node)

Thanks,

Philip
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