Re: [PATCH] teach fast-export an --anonymize option

On Thu, Aug 21, 2014 at 02:57:22PM -0700, Junio C Hamano wrote:

Jeff King [off-list ref] writes:

quoted

+--anonymize::
+	Replace all paths, blob contents, commit and tag messages,
+	names, and email addresses in the output with anonymized data,
+	while still retaining the shape of history and of the stored
+	tree.

Sometimes branch names can contain codenames the project may prefer
to hide from the general public, so they may need to be anonymised
as well.

Yes, I do anonymize them (and check it in the tests). See
anonymize_refname. I just forgot to include it in the list. Trivial
squashable patch is below.

The few things I don't anonymize are:

  1. ref prefixes. We see the same distribution of refs/heads vs
     refs/tags, etc.

  2. refs/heads/master is left untouched, for convenience (and because
     it's not really a secret). The implementation is lazy, though, and
     would leave "refs/heads/master-supersecret", as well. I can tighten
     that if we really want to be careful.

  3. gitlinks are left untouched, since sha1s cannot be reversed. This
     could leak some information (if your private repo points to a
     public, I can find out you have it as submodule). I doubt it
     matters, but we can also scramble the sha1s.

---

diff --git a/Documentation/git-fast-export.txt b/Documentation/git-fast-export.txt
index 0ec7cad..52831fa 100644
--- a/Documentation/git-fast-export.txt
+++ b/Documentation/git-fast-export.txt

@@ -106,10 +106,10 @@ marks the same across runs.
 	different from the commit's first parent).
 
 --anonymize::
-	Replace all paths, blob contents, commit and tag messages,
-	names, and email addresses in the output with anonymized data,
-	while still retaining the shape of history and of the stored
-	tree.
+	Replace all refnames, paths, blob contents, commit and tag
+	messages, names, and email addresses in the output with
+	anonymized data, while still retaining the shape of history and
+	of the stored tree.
 
 --refspec::
 	Apply the specified refspec to each ref exported. Multiple of them can