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index 8c43be611a3a632788e4dcb9e322c4522fccb334..895d7503100632f5ab79af548fed3b3a6d79c413 100644 (file)
[--index-filter <command>] [--parent-filter <command>]
[--msg-filter <command>] [--commit-filter <command>]
[--tag-name-filter <command>] [--subdirectory-filter <directory>]
[--index-filter <command>] [--parent-filter <command>]
[--msg-filter <command>] [--commit-filter <command>]
[--tag-name-filter <command>] [--subdirectory-filter <directory>]
- [-d <directory>] [-f | --force] [<rev-list options>...]
+ [--original <namespace>] [-d <directory>] [-f | --force]
+ [<rev-list options>...]
DESCRIPTION
-----------
DESCRIPTION
-----------
-Lets you rewrite git revision history by creating a new branch from
-your current branch, applying custom filters on each revision.
+Lets you rewrite git revision history by rewriting the branches mentioned
+in the <rev-list options>, applying custom filters on each revision.
Those filters can modify each tree (e.g. removing a file or running
a perl rewrite on all files) or information about each commit.
Otherwise, all information (including original commit times or merge
information) will be preserved.
Those filters can modify each tree (e.g. removing a file or running
a perl rewrite on all files) or information about each commit.
Otherwise, all information (including original commit times or merge
information) will be preserved.
-The command takes the new branch name as a mandatory argument and
-the filters as optional arguments. 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, therefore such a usage is
-permitted.
+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).
+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,
+therefore such a usage is permitted.
*WARNING*! The rewritten history will have different object names for all
the objects and will not converge with the original branch. You will not
*WARNING*! The rewritten history will have different object names for all
the objects and will not converge with the original branch. You will not
'refs/original/'.
Note that since this operation is extensively I/O expensive, it might
'refs/original/'.
Note that since this operation is extensively I/O expensive, it might
-be a good idea to redirect the temporary directory off-disk, e.g. on
-tmpfs. Reportedly the speedup is very noticeable.
+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.
Filters
Filters
As a special extension, the commit filter may emit multiple
commit ids; in that case, ancestors of the original commit will
have all of them as parents.
As a special extension, the commit filter may emit multiple
commit ids; in that case, ancestors 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).
--tag-name-filter <command>::
This is the filter for rewriting tag names. When passed,
--tag-name-filter <command>::
This is the filter for rewriting tag names. When passed,
The result will contain that directory (and only that) as its
project root.
The result will contain that directory (and only that) as its
project root.
+--original <namespace>::
+ Use this option to set the namespace where the original commits
+ will be stored. The default value is 'refs/original'.
+
-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
-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
does this in the '.git-rewrite/' directory but you can override
that choice by this parameter.
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.
`git filter-branch` refuses to start with an existing temporary
directory or when there are already refs starting with
'refs/original/', unless forced.
git filter-branch --index-filter 'git update-index --remove filename' HEAD
--------------------------------------------------------------------------
git filter-branch --index-filter 'git update-index --remove filename' HEAD
--------------------------------------------------------------------------
-Now, you will get the rewritten history saved in the branch 'newbranch'
-(your current branch is left untouched).
+Now, you will get the rewritten history saved in HEAD.
To set a commit (which typically is at the tip of another
history) to be the parent of the current initial commit, in
To set a commit (which typically is at the tip of another
history) to be the parent of the current initial commit, in
git filter-branch --parent-filter 'sed "s/^\$/-p <graft-id>/"' HEAD
-------------------------------------------------------------------
git filter-branch --parent-filter 'sed "s/^\$/-p <graft-id>/"' HEAD
-------------------------------------------------------------------
-(if the parent string is empty - therefore we are dealing with the
-initial commit - add graftcommit as a parent). Note that this assumes
+(if the parent string is empty - which happens when we are dealing with
+the initial commit - add graftcommit as a parent). Note that this assumes
history with a single root (that is, no merge without common ancestors
happened). If this is not the case, use:
history with a single root (that is, no merge without common ancestors
happened). If this is not the case, use:
git filter-branch --commit-filter '
if [ "$GIT_AUTHOR_NAME" = "Darl McBribe" ];
then
git filter-branch --commit-filter '
if [ "$GIT_AUTHOR_NAME" = "Darl McBribe" ];
then
- shift;
- while [ -n "$1" ];
- do
- shift;
- echo "$1";
- shift;
- done;
+ skip_commit "$@";
else
git commit-tree "$@";
fi' HEAD
------------------------------------------------------------------------------
else
git commit-tree "$@";
fi' HEAD
------------------------------------------------------------------------------
+The function 'skip_commit' is defined as follows:
+
+--------------------------
+skip_commit()
+{
+ shift;
+ while [ -n "$1" ];
+ do
+ shift;
+ map "$1";
+ shift;
+ done;
+}
+--------------------------
+
The shift magic first throws away the tree id and then the -p
parameters. Note that this handles merges properly! In case Darl
committed a merge between P1 and P2, it will be propagated properly
and all children of the merge will become merge commits with P1,P2
as their parents instead of the merge commit.
The shift magic first throws away the tree id and then the -p
parameters. Note that this handles merges properly! In case Darl
committed a merge between P1 and P2, it will be propagated properly
and all children of the merge will become merge commits with P1,P2
as their parents instead of the merge commit.
+
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
point to the top-most revision that a 'git rev-list' of this range
will print.
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
point to the top-most revision that a 'git rev-list' of this range
will print.
-Note that the changes introduced by the commits, and not reverted by
-subsequent commits, will still be in the rewritten branch. If you want
+*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].
to throw out _changes_ together with the commits, you should use the
interactive mode of gitlink:git-rebase[1].
+
Consider this history:
------------------
Consider this history:
------------------