# strange histories from filter-branch

1 messages from 2014-08-22 to 2014-08-22. Participants: Bernard Clark.
Thread: https://gitlist.dev/t/37397

## Bernard Clark, 2014-08-22 12:41

Subject: strange histories from filter-branch
Message-ID: <CACpvNxTTN7G09L0WPvs4eq9v9U9duoy-bz0b1Smj4A=hwwYhtg@mail.gmail.com>
URL: https://gitlist.dev/e/CACpvNxTTN7G09L0WPvs4eq9v9U9duoy-bz0b1Smj4A%3DhwwYhtg%40mail.gmail.com

```
I tried sending this mail to the "git for humans" mailing list but got
no response, so I'll try here.

I've been running the git filter-branch described on this page:

http://stackoverflow.com/questions/14759345/how-to-split-a-git-repository-and-follow-directory-renames.

But the resulting history includes at least two extraneous commits,
i.e., commits that appear to affect no files in the subdirectory of
interest. (The corresponding commits in the original history do affect
files, but those files are in another subdirectory.)

I also noticed several "duplicate parent" errors during the git
filter-branch. The page
http://stackoverflow.com/questions/15161809/git-duplicate-parent-causes-half-the-history-to-to-disappear
says that those errors can produce an incomplete new history, so I'm
now wondering if, in addition to including extraneous commits, my new
history might also be missing some. Both that page and
http://stackoverflow.com/questions/7489713/git-duplicate-parent/7501703#7501703
say that the "duplicate parent" errors should disappear if "git
filter-branch" is first run with no filter. But that didn't work for
me.

Any ideas?

```