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Merge branch 'js/filter' into ei/worktree+filter
* js/filter: filter-branch: also don't fail in map() if a commit cannot be mapped filter-branch: Use rev-list arguments to specify revision ranges. filter-branch: fix behaviour of '-k' filter-branch: use $(($i+1)) instead of $((i+1)) chmod +x git-filter-branch.sh filter-branch: prevent filters from reading from stdin t7003: make test repeatable Add git-filter-branch
This commit is contained in:
Junio C Hamano
commit
3270736bd1
3 changed files with 475 additions and 1 deletions
3
Makefile
3
Makefile
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@ -209,7 +209,8 @@ SCRIPT_SH = \
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git-am.sh \
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git-am.sh \
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git-merge.sh git-merge-stupid.sh git-merge-octopus.sh \
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git-merge.sh git-merge-stupid.sh git-merge-octopus.sh \
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git-merge-resolve.sh git-merge-ours.sh \
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git-merge-resolve.sh git-merge-ours.sh \
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git-lost-found.sh git-quiltimport.sh git-submodule.sh
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git-lost-found.sh git-quiltimport.sh git-submodule.sh \
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git-filter-branch.sh
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SCRIPT_PERL = \
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SCRIPT_PERL = \
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git-add--interactive.perl \
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git-add--interactive.perl \
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416
git-filter-branch.sh
Executable file
416
git-filter-branch.sh
Executable file
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@ -0,0 +1,416 @@
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#!/bin/sh
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#
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# Rewrite revision history
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# Copyright (c) Petr Baudis, 2006
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# Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007
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#
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# Lets you rewrite GIT revision history by creating a new branch from
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# your current branch by applying custom filters on each revision.
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# Those filters can modify each tree (e.g. removing a file or running
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# a perl rewrite on all files) or information about each commit.
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# Otherwise, all information (including original commit times or merge
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# information) will be preserved.
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#
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# The command takes the new branch name as a mandatory argument and
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# the filters as optional arguments. If you specify no filters, the
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# commits will be recommitted without any changes, which would normally
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# have no effect and result with the new branch pointing to the same
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# branch as your current branch. (Nevertheless, this may be useful in
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# the future for compensating for some Git bugs or such, therefore
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# such a usage is permitted.)
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#
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# WARNING! The rewritten history will have different ids for all the
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# objects and will not converge with the original branch. You will not
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# be able to easily push and distribute the rewritten branch. Please do
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# not use this command if you do not know the full implications, and
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# avoid using it anyway - do not do what a simple single commit on top
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# of the current version would fix.
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#
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# Always verify that the rewritten version is correct before disposing
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# the original branch.
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#
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# Note that since this operation is extensively I/O expensive, it might
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# be a good idea to do it off-disk, e.g. on tmpfs. Reportedly the speedup
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# is very noticeable.
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#
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# OPTIONS
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# -------
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# -d TEMPDIR:: The path to the temporary tree used for rewriting
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# When applying a tree filter, the command needs to temporary
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# checkout the tree to some directory, which may consume
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# considerable space in case of large projects. By default it
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# does this in the '.git-rewrite/' directory but you can override
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# that choice by this parameter.
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#
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# Filters
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# ~~~~~~~
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# The filters are applied in the order as listed below. The COMMAND
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# argument is always evaluated in shell using the 'eval' command.
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# The $GIT_COMMIT environment variable is permanently set to contain
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# the id of the commit being rewritten. The author/committer environment
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# variables are set before the first filter is run.
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#
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# A 'map' function is available that takes an "original sha1 id" argument
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# and outputs a "rewritten sha1 id" if the commit has been already
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# rewritten, fails otherwise; the 'map' function can return several
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# ids on separate lines if your commit filter emitted multiple commits
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# (see below).
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#
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# --env-filter COMMAND:: The filter for modifying environment
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# This is the filter for modifying the environment in which
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# the commit will be performed. Specifically, you might want
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# to rewrite the author/committer name/email/time environment
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# variables (see `git-commit` for details). Do not forget to
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# re-export the variables.
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#
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# --tree-filter COMMAND:: The filter for rewriting tree (and its contents)
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# This is the filter for rewriting the tree and its contents.
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# The COMMAND argument is evaluated in shell with the working
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# directory set to the root of the checked out tree. The new tree
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# is then used as-is (new files are auto-added, disappeared files
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# are auto-removed - .gitignore files nor any other ignore rules
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# HAVE NO EFFECT!).
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#
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# --index-filter COMMAND:: The filter for rewriting index
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# This is the filter for rewriting the Git's directory index.
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# It is similar to the tree filter but does not check out the
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# tree, which makes it much faster. However, you must use the
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# lowlevel Git index manipulation commands to do your work.
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#
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# --parent-filter COMMAND:: The filter for rewriting parents
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# This is the filter for rewriting the commit's parent list.
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# It will receive the parent string on stdin and shall output
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# the new parent string on stdout. The parent string is in
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# format accepted by `git-commit-tree`: empty for initial
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# commit, "-p parent" for a normal commit and "-p parent1
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# -p parent2 -p parent3 ..." for a merge commit.
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#
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# --msg-filter COMMAND:: The filter for rewriting commit message
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# This is the filter for rewriting the commit messages.
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# The COMMAND argument is evaluated in shell with the original
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# commit message on standard input; its standard output is
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# is used as the new commit message.
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#
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# --commit-filter COMMAND:: The filter for performing the commit
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# If this filter is passed, it will be called instead of the
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# `git-commit-tree` command, with those arguments:
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#
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# TREE_ID [-p PARENT_COMMIT_ID]...
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#
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# and the log message on stdin. The commit id is expected on
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# stdout. As a special extension, the commit filter may emit
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# multiple commit ids; in that case, all of them will be used
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# as parents instead of the original commit in further commits.
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#
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# --tag-name-filter COMMAND:: The filter for rewriting tag names.
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# If this filter is passed, it will be called for every tag ref
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# that points to a rewritten object (or to a tag object which
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# points to a rewritten object). The original tag name is passed
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# via standard input, and the new tag name is expected on standard
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# output.
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#
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# The original tags are not deleted, but can be overwritten;
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# use "--tag-name-filter=cat" to simply update the tags. In this
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# case, be very careful and make sure you have the old tags
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# backed up in case the conversion has run afoul.
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#
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# Note that there is currently no support for proper rewriting of
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# tag objects; in layman terms, if the tag has a message or signature
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# attached, the rewritten tag won't have it. Sorry. (It is by
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# definition impossible to preserve signatures at any rate, though.)
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#
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# EXAMPLE USAGE
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# -------------
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# Suppose you want to remove a file (containing confidential information
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# or copyright violation) from all commits:
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#
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# git-filter-branch --tree-filter 'rm filename' newbranch
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#
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# A significantly faster version:
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#
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# git-filter-branch --index-filter 'git-update-index --remove filename' newbranch
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#
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# Now, you will get the rewritten history saved in the branch 'newbranch'
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# (your current branch is left untouched).
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#
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# To "etch-graft" a commit to the revision history (set a commit to be
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# the parent of the current initial commit and propagate that):
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#
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# git-filter-branch --parent-filter sed\ 's/^$/-p graftcommitid/' newbranch
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#
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# (if the parent string is empty - therefore we are dealing with the
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# initial commit - add graftcommit as a parent). Note that this assumes
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# history with a single root (that is, no git-merge without common ancestors
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# happened). If this is not the case, use:
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#
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# git-filter-branch --parent-filter 'cat; [ "$GIT_COMMIT" = "COMMIT" ] && echo "-p GRAFTCOMMIT"' newbranch
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#
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# To remove commits authored by "Darl McBribe" from the history:
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#
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# git-filter-branch --commit-filter 'if [ "$GIT_AUTHOR_NAME" = "Darl McBribe" ]; then shift; while [ -n "$1" ]; do shift; echo "$1"; shift; done; else git-commit-tree "$@"; fi' newbranch
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#
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||||||
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# (the shift magic first throws away the tree id and then the -p
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# parameters). Note that this handles merges properly! In case Darl
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# committed a merge between P1 and P2, it will be propagated properly
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# and all children of the merge will become merge commits with P1,P2
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# as their parents instead of the merge commit.
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#
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||||||
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# To restrict rewriting to only part of the history, specify a revision
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# range in addition to the new branch name. The new branch name will
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# point to the top-most revision that a 'git rev-list' of this range
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# will print.
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#
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||||||
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# Consider this history:
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#
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# D--E--F--G--H
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# / /
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# A--B-----C
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#
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# To rewrite commits D,E,F,G,H, use:
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#
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# git-filter-branch ... new-H C..H
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#
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# To rewrite commits E,F,G,H, use one of these:
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#
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# git-filter-branch ... new-H C..H --not D
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# git-filter-branch ... new-H D..H --not C
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|
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|
# Testsuite: TODO
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|
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|
set -e
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|
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|
USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] DESTBRANCH [REV-RANGE]"
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|
. git-sh-setup
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|
|
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map()
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{
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# if it was not rewritten, take the original
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test -r "$workdir/../map/$1" || echo "$1"
|
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|
cat "$workdir/../map/$1"
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||||||
|
}
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||||||
|
|
||||||
|
# When piped a commit, output a script to set the ident of either
|
||||||
|
# "author" or "committer
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||||||
|
|
||||||
|
set_ident () {
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||||||
|
lid="$(echo "$1" | tr "A-Z" "a-z")"
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|
uid="$(echo "$1" | tr "a-z" "A-Z")"
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||||||
|
pick_id_script='
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||||||
|
/^'$lid' /{
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||||||
|
s/'\''/'\''\\'\'\''/g
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||||||
|
h
|
||||||
|
s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
|
||||||
|
s/'\''/'\''\'\'\''/g
|
||||||
|
s/.*/export GIT_'$uid'_NAME='\''&'\''/p
|
||||||
|
|
||||||
|
g
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||||||
|
s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
|
||||||
|
s/'\''/'\''\'\'\''/g
|
||||||
|
s/.*/export GIT_'$uid'_EMAIL='\''&'\''/p
|
||||||
|
|
||||||
|
g
|
||||||
|
s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
|
||||||
|
s/'\''/'\''\'\'\''/g
|
||||||
|
s/.*/export GIT_'$uid'_DATE='\''&'\''/p
|
||||||
|
|
||||||
|
q
|
||||||
|
}
|
||||||
|
'
|
||||||
|
|
||||||
|
LANG=C LC_ALL=C sed -ne "$pick_id_script"
|
||||||
|
# Ensure non-empty id name.
|
||||||
|
echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
|
||||||
|
}
|
||||||
|
|
||||||
|
# list all parent's object names for a given commit
|
||||||
|
get_parents () {
|
||||||
|
git-rev-list -1 --parents "$1" | sed "s/^[0-9a-f]*//"
|
||||||
|
}
|
||||||
|
|
||||||
|
tempdir=.git-rewrite
|
||||||
|
filter_env=
|
||||||
|
filter_tree=
|
||||||
|
filter_index=
|
||||||
|
filter_parent=
|
||||||
|
filter_msg=cat
|
||||||
|
filter_commit='git-commit-tree "$@"'
|
||||||
|
filter_tag_name=
|
||||||
|
while case "$#" in 0) usage;; esac
|
||||||
|
do
|
||||||
|
case "$1" in
|
||||||
|
--)
|
||||||
|
shift
|
||||||
|
break
|
||||||
|
;;
|
||||||
|
-*)
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
break;
|
||||||
|
esac
|
||||||
|
|
||||||
|
# all switches take one argument
|
||||||
|
ARG="$1"
|
||||||
|
case "$#" in 1) usage ;; esac
|
||||||
|
shift
|
||||||
|
OPTARG="$1"
|
||||||
|
shift
|
||||||
|
|
||||||
|
case "$ARG" in
|
||||||
|
-d)
|
||||||
|
tempdir="$OPTARG"
|
||||||
|
;;
|
||||||
|
--env-filter)
|
||||||
|
filter_env="$OPTARG"
|
||||||
|
;;
|
||||||
|
--tree-filter)
|
||||||
|
filter_tree="$OPTARG"
|
||||||
|
;;
|
||||||
|
--index-filter)
|
||||||
|
filter_index="$OPTARG"
|
||||||
|
;;
|
||||||
|
--parent-filter)
|
||||||
|
filter_parent="$OPTARG"
|
||||||
|
;;
|
||||||
|
--msg-filter)
|
||||||
|
filter_msg="$OPTARG"
|
||||||
|
;;
|
||||||
|
--commit-filter)
|
||||||
|
filter_commit="$OPTARG"
|
||||||
|
;;
|
||||||
|
--tag-name-filter)
|
||||||
|
filter_tag_name="$OPTARG"
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
usage
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
done
|
||||||
|
|
||||||
|
dstbranch="$1"
|
||||||
|
shift
|
||||||
|
test -n "$dstbranch" || die "missing branch name"
|
||||||
|
git-show-ref "refs/heads/$dstbranch" 2> /dev/null &&
|
||||||
|
die "branch $dstbranch already exists"
|
||||||
|
|
||||||
|
test ! -e "$tempdir" || die "$tempdir already exists, please remove it"
|
||||||
|
mkdir -p "$tempdir/t"
|
||||||
|
cd "$tempdir/t"
|
||||||
|
workdir="$(pwd)"
|
||||||
|
|
||||||
|
case "$GIT_DIR" in
|
||||||
|
/*)
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
export GIT_DIR="$(pwd)/../../$GIT_DIR"
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
export GIT_INDEX_FILE="$(pwd)/../index"
|
||||||
|
git-read-tree # seed the index file
|
||||||
|
|
||||||
|
ret=0
|
||||||
|
|
||||||
|
|
||||||
|
mkdir ../map # map old->new commit ids for rewriting parents
|
||||||
|
|
||||||
|
git-rev-list --reverse --topo-order --default HEAD "$@" >../revs
|
||||||
|
commits=$(cat ../revs | wc -l | tr -d " ")
|
||||||
|
|
||||||
|
test $commits -eq 0 && die "Found nothing to rewrite"
|
||||||
|
|
||||||
|
i=0
|
||||||
|
while read commit; do
|
||||||
|
i=$(($i+1))
|
||||||
|
printf "$commit ($i/$commits) "
|
||||||
|
|
||||||
|
git-read-tree -i -m $commit
|
||||||
|
|
||||||
|
export GIT_COMMIT=$commit
|
||||||
|
git-cat-file commit "$commit" >../commit
|
||||||
|
|
||||||
|
eval "$(set_ident AUTHOR <../commit)"
|
||||||
|
eval "$(set_ident COMMITTER <../commit)"
|
||||||
|
eval "$filter_env" < /dev/null
|
||||||
|
|
||||||
|
if [ "$filter_tree" ]; then
|
||||||
|
git-checkout-index -f -u -a
|
||||||
|
# files that $commit removed are now still in the working tree;
|
||||||
|
# remove them, else they would be added again
|
||||||
|
git-ls-files -z --others | xargs -0 rm -f
|
||||||
|
eval "$filter_tree" < /dev/null
|
||||||
|
git-diff-index -r $commit | cut -f 2- | tr '\n' '\0' | \
|
||||||
|
xargs -0 git-update-index --add --replace --remove
|
||||||
|
git-ls-files -z --others | \
|
||||||
|
xargs -0 git-update-index --add --replace --remove
|
||||||
|
fi
|
||||||
|
|
||||||
|
eval "$filter_index" < /dev/null
|
||||||
|
|
||||||
|
parentstr=
|
||||||
|
for parent in $(get_parents $commit); do
|
||||||
|
for reparent in $(map "$parent"); do
|
||||||
|
parentstr="$parentstr -p $reparent"
|
||||||
|
done
|
||||||
|
done
|
||||||
|
if [ "$filter_parent" ]; then
|
||||||
|
parentstr="$(echo "$parentstr" | eval "$filter_parent")"
|
||||||
|
fi
|
||||||
|
|
||||||
|
sed -e '1,/^$/d' <../commit | \
|
||||||
|
eval "$filter_msg" | \
|
||||||
|
sh -c "$filter_commit" git-commit-tree $(git-write-tree) $parentstr | \
|
||||||
|
tee ../map/$commit
|
||||||
|
done <../revs
|
||||||
|
|
||||||
|
src_head=$(tail -n 1 ../revs)
|
||||||
|
target_head=$(head -n 1 ../map/$src_head)
|
||||||
|
case "$target_head" in
|
||||||
|
'')
|
||||||
|
echo Nothing rewritten
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
git-update-ref refs/heads/"$dstbranch" $target_head
|
||||||
|
if [ $(cat ../map/$src_head | wc -l) -gt 1 ]; then
|
||||||
|
echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
|
||||||
|
sed 's/^/ /' ../map/$src_head >&2
|
||||||
|
ret=1
|
||||||
|
fi
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
if [ "$filter_tag_name" ]; then
|
||||||
|
git-for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |
|
||||||
|
while read sha1 type ref; do
|
||||||
|
ref="${ref#refs/tags/}"
|
||||||
|
# XXX: Rewrite tagged trees as well?
|
||||||
|
if [ "$type" != "commit" -a "$type" != "tag" ]; then
|
||||||
|
continue;
|
||||||
|
fi
|
||||||
|
|
||||||
|
if [ "$type" = "tag" ]; then
|
||||||
|
# Dereference to a commit
|
||||||
|
sha1t="$sha1"
|
||||||
|
sha1="$(git-rev-parse "$sha1"^{commit} 2>/dev/null)" || continue
|
||||||
|
fi
|
||||||
|
|
||||||
|
[ -f "../map/$sha1" ] || continue
|
||||||
|
new_sha1="$(cat "../map/$sha1")"
|
||||||
|
export GIT_COMMIT="$sha1"
|
||||||
|
new_ref="$(echo "$ref" | eval "$filter_tag_name")"
|
||||||
|
|
||||||
|
echo "$ref -> $new_ref ($sha1 -> $new_sha1)"
|
||||||
|
|
||||||
|
if [ "$type" = "tag" ]; then
|
||||||
|
# Warn that we are not rewriting the tag object itself.
|
||||||
|
warn "unreferencing tag object $sha1t"
|
||||||
|
fi
|
||||||
|
|
||||||
|
git-update-ref "refs/tags/$new_ref" "$new_sha1"
|
||||||
|
done
|
||||||
|
fi
|
||||||
|
|
||||||
|
cd ../..
|
||||||
|
rm -rf "$tempdir"
|
||||||
|
echo "Rewritten history saved to the $dstbranch branch"
|
||||||
|
|
||||||
|
exit $ret
|
||||||
57
t/t7003-filter-branch.sh
Executable file
57
t/t7003-filter-branch.sh
Executable file
|
|
@ -0,0 +1,57 @@
|
||||||
|
#!/bin/sh
|
||||||
|
|
||||||
|
test_description='git-filter-branch'
|
||||||
|
. ./test-lib.sh
|
||||||
|
|
||||||
|
make_commit () {
|
||||||
|
lower=$(echo $1 | tr A-Z a-z)
|
||||||
|
echo $lower > $lower
|
||||||
|
git add $lower
|
||||||
|
test_tick
|
||||||
|
git commit -m $1
|
||||||
|
git tag $1
|
||||||
|
}
|
||||||
|
|
||||||
|
test_expect_success 'setup' '
|
||||||
|
make_commit A
|
||||||
|
make_commit B
|
||||||
|
git checkout -b branch B
|
||||||
|
make_commit D
|
||||||
|
make_commit E
|
||||||
|
git checkout master
|
||||||
|
make_commit C
|
||||||
|
git checkout branch
|
||||||
|
git merge C
|
||||||
|
git tag F
|
||||||
|
make_commit G
|
||||||
|
make_commit H
|
||||||
|
'
|
||||||
|
|
||||||
|
H=$(git-rev-parse H)
|
||||||
|
|
||||||
|
test_expect_success 'rewrite identically' '
|
||||||
|
git-filter-branch H2
|
||||||
|
'
|
||||||
|
|
||||||
|
test_expect_success 'result is really identical' '
|
||||||
|
test $H = $(git-rev-parse H2)
|
||||||
|
'
|
||||||
|
|
||||||
|
test_expect_success 'rewrite, renaming a specific file' '
|
||||||
|
git-filter-branch --tree-filter "mv d doh || :" H3
|
||||||
|
'
|
||||||
|
|
||||||
|
test_expect_success 'test that the file was renamed' '
|
||||||
|
test d = $(git show H3:doh)
|
||||||
|
'
|
||||||
|
|
||||||
|
git tag oldD H3~4
|
||||||
|
test_expect_success 'rewrite one branch, keeping a side branch' '
|
||||||
|
git-filter-branch --tree-filter "mv b boh || :" modD D..oldD
|
||||||
|
'
|
||||||
|
|
||||||
|
test_expect_success 'common ancestor is still common (unchanged)' '
|
||||||
|
test "$(git-merge-base modD D)" = "$(git-rev-parse B)"
|
||||||
|
'
|
||||||
|
|
||||||
|
test_done
|
||||||
Loading…
Reference in a new issue