I believe I've stumbled across an inconsistency in how git commit-tree
reads messages from stdin. I would expect the behavior of these two
commands to be identical, and that neither would actually change any
commits:
git filter-branch --commit-filter 'git commit-tree $@'
git filter-branch --commit-filter 'git commit-tree -F - $@'
(If that assumption is untrue, please feel free to correct me and
disregard the rest of this message.)
What I'm observing is that if I add a commit with a message that
doesn't end in a trailing newline, like this:
git merge `echo -n "No trailing newline" | git commit-tree
HEAD^{tree} -p HEAD`
Then I get different behavior in different versions of Git on
different platforms. On git 1.8.4 on Ubuntu 12.04 (build from
https://launchpad.net/~git-core/+archive/ppa) under GNU bash, version
4.2.25(1)-release (x86_64-pc-linux-gnu), using "-F -" seems to add a
linefeed to the body:
$ git log -n 1 --format=:%H:%B:
: 4a11052c110c3daea46c89ae1118b1a2c59cc01b:No trailing newline:
$ git filter-branch --commit-filter 'git commit-tree $@'
Rewrite 4a11052c110c3daea46c89ae1118b1a2c59cc01b (2/2)
WARNING: Ref 'refs/heads/master' is unchanged
$ git filter-branch --commit-filter 'git commit-tree -F - $@'
Rewrite 4a11052c110c3daea46c89ae1118b1a2c59cc01b (2/2)
Ref 'refs/heads/master' was rewritten
$ git log -n 1 --format=:%H:%B:
:5ecba0ff0ca1290f2a5e3a599622e2a59e311f67:No trailing newline
:
On git 1.7.12.4 (Apple Git-37) on Mac OS X 10.8.5 using GNU bash,
version 3.2.48(1)-release (x86_64-apple-darwin12), both commands (with
and without the "-F -" add newlines to the body of the commits.
Thanks for your attention!
Mick
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