information) will be preserved.
The command will only rewrite the _positive_ refs mentioned in the
-command line (i.e. if you pass 'a..b', only 'b' will be rewritten).
+command line (e.g. if you pass 'a..b', only 'b' will be rewritten).
If you specify no filters, the commits will be recommitted without any
changes, which would normally have no effect. Nevertheless, this may be
useful in the future for compensating for some git bugs or such,
if different from the rewritten ones, will be stored in the namespace
'refs/original/'.
-Note that since this operation is extensively I/O expensive, it might
+Note that since this operation is very I/O expensive, it might
be a good idea to redirect the temporary directory off-disk with the
'-d' option, e.g. on tmpfs. Reportedly the speedup is very noticeable.
~~~~~~~
The filters are applied in the order as listed below. The <command>
-argument is always evaluated in shell using the 'eval' command (with the
-notable exception of the commit filter, for technical reasons).
+argument is always evaluated in the shell context using the 'eval' command
+(with the notable exception of the commit filter, for technical reasons).
Prior to that, the $GIT_COMMIT environment variable will be set to contain
the id of the commit being rewritten. Also, GIT_AUTHOR_NAME,
GIT_AUTHOR_EMAIL, GIT_AUTHOR_DATE, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL,
-and GIT_COMMITTER_DATE are set according to the current commit.
+and GIT_COMMITTER_DATE are set according to the current commit. The values
+of these variables after the filters have run, are used for the new commit.
+If any evaluation of <command> returns a non-zero exit status, the whole
+operation will be aborted.
A 'map' function is available that takes an "original sha1 id" argument
and outputs a "rewritten sha1 id" if the commit has been already
-------
--env-filter <command>::
- This is the filter for modifying the environment in which
- the commit will be performed. Specifically, you might want
- to rewrite the author/committer name/email/time environment
- variables (see gitlink:git-commit[1] for details). Do not forget
+ This filter may be used if you only need to modify the environment
+ in which the commit will be performed. Specifically, you might
+ want to rewrite the author/committer name/email/time environment
+ variables (see linkgit:git-commit[1] for details). Do not forget
to re-export the variables.
--tree-filter <command>::
--index-filter <command>::
This is the filter for rewriting the index. It is similar to the
tree filter but does not check out the tree, which makes it much
- faster. For hairy cases, see gitlink:git-update-index[1].
+ faster. For hairy cases, see linkgit:git-update-index[1].
--parent-filter <command>::
This is the filter for rewriting the commit's parent list.
It will receive the parent string on stdin and shall output
the new parent string on stdout. The parent string is in
- a format accepted by gitlink:git-commit-tree[1]: empty for
+ a format accepted by linkgit:git-commit-tree[1]: empty for
the initial commit, "-p parent" for a normal commit and
"-p parent1 -p parent2 -p parent3 ..." for a merge commit.
--commit-filter <command>::
This is the filter for performing the commit.
If this filter is specified, it will be called instead of the
- gitlink:git-commit-tree[1] command, with arguments of the form
+ linkgit:git-commit-tree[1] command, with arguments of the form
"<TREE_ID> [-p <PARENT_COMMIT_ID>]..." and the log message on
stdin. The commit id is expected on stdout.
+
As a special extension, the commit filter may emit multiple
-commit ids; in that case, ancestors of the original commit will
+commit ids; in that case, the rewritten children of the original commit will
have all of them as parents.
+
You can use the 'map' convenience function in this filter, and other
convenience functions, too. For example, calling 'skip_commit "$@"'
will leave out the current commit (but not its changes! If you want
-that, use gitlink:git-rebase[1] instead).
+that, use linkgit:git-rebase[1] instead).
--tag-name-filter <command>::
This is the filter for rewriting tag names. When passed,
case, be very careful and make sure you have the old tags
backed up in case the conversion has run afoul.
+
-Note that there is currently no support for proper rewriting of
-tag objects; in layman terms, if the tag has a message or signature
-attached, the rewritten tag won't have it. Sorry. (It is by
-definition impossible to preserve signatures at any rate.)
+Nearly proper rewriting of tag objects is supported. If the tag has
+a message attached, a new tag object will be created with the same message,
+author, and timestamp. If the tag has a signature attached, the
+signature will be stripped. It is by definition impossible to preserve
+signatures. The reason this is "nearly" proper, is because ideally if
+the tag did not change (points to the same object, has the same name, etc.)
+it should retain any signature. That is not the case, signatures will always
+be removed, buyer beware. There is also no support for changing the
+author or timestamp (or the tag message for that matter). Tags which point
+to other tags will be rewritten to point to the underlying commit.
--subdirectory-filter <directory>::
Only look at the history which touches the given subdirectory.
-d <directory>::
Use this option to set the path to the temporary directory used for
rewriting. When applying a tree filter, the command needs to
- temporary checkout the tree to some directory, which may consume
+ temporarily check out the tree to some directory, which may consume
considerable space in case of large projects. By default it
does this in the '.git-rewrite/' directory but you can override
that choice by this parameter.
--f|--force::
+-f::
+--force::
`git filter-branch` refuses to start with an existing temporary
directory or when there are already refs starting with
'refs/original/', unless forced.
<rev-list-options>::
When options are given after the new branch name, they will
- be passed to gitlink:git-rev-list[1]. Only commits in the resulting
+ be passed to linkgit:git-rev-list[1]. Only commits in the resulting
output will be filtered, although the filtered commits can still
reference parents which are outside of that set.
git filter-branch --tree-filter 'rm filename' HEAD
-------------------------------------------------------
+However, if the file is absent from the tree of some commit,
+a simple `rm filename` will fail for that tree and commit.
+Thus you may instead want to use `rm -f filename` as the script.
+
A significantly faster version:
--------------------------------------------------------------------------
--------------------------------------------------------------------------
git filter-branch --parent-filter \
- 'cat; test $GIT_COMMIT = <commit-id> && echo "-p <graft-id>"' HEAD
+ 'test $GIT_COMMIT = <commit-id> && echo "-p <graft-id>" || cat' HEAD
--------------------------------------------------------------------------
or even simpler:
and all children of the merge will become merge commits with P1,P2
as their parents instead of the merge commit.
+You can rewrite the commit log messages using `--msg-filter`. For
+example, `git-svn-id` strings in a repository created by `git-svn` can
+be removed this way:
+
+-------------------------------------------------------
+git filter-branch --msg-filter '
+ sed -e "/^git-svn-id:/d"
+'
+-------------------------------------------------------
To restrict rewriting to only part of the history, specify a revision
range in addition to the new branch name. The new branch name will
*NOTE* the changes introduced by the commits, and which are not reverted
by subsequent commits, will still be in the rewritten branch. If you want
to throw out _changes_ together with the commits, you should use the
-interactive mode of gitlink:git-rebase[1].
+interactive mode of linkgit:git-rebase[1].
Consider this history:
GIT
---
-Part of the gitlink:git[7] suite
+Part of the linkgit:git[1] suite