mirror of
https://github.com/git/git.git
synced 2024-11-18 02:53:55 +01:00
5876b8ee3c
- Remove "DESTBRANCH" from usage, as it rewrites the branches given. - Remove an = from an example usage, as the script doesn't understand it. Signed-off-by: Brian Gernhardt <benji@silverinsanity.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
391 lines
8.7 KiB
Bash
Executable File
391 lines
8.7 KiB
Bash
Executable File
#!/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 the revision history of the current branch, creating
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# a new branch. You can specify a number of filters to modify the commits,
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# files and trees.
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USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] [REV-RANGE]"
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. git-sh-setup
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warn () {
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echo "$*" >&2
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}
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map()
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{
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# if it was not rewritten, take the original
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if test -r "$workdir/../map/$1"
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then
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cat "$workdir/../map/$1"
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else
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echo "$1"
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fi
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}
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# override die(): this version puts in an extra line break, so that
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# the progress is still visible
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die()
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{
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echo >&2
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echo "$*" >&2
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exit 1
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}
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# When piped a commit, output a script to set the ident of either
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# "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
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s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/export GIT_'$uid'_NAME='\''&'\''/p
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g
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s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/export GIT_'$uid'_EMAIL='\''&'\''/p
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g
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s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/export GIT_'$uid'_DATE='\''&'\''/p
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q
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}
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'
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LANG=C LC_ALL=C sed -ne "$pick_id_script"
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# Ensure non-empty id name.
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echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
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}
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tempdir=.git-rewrite
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filter_env=
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filter_tree=
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filter_index=
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filter_parent=
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filter_msg=cat
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filter_commit='git commit-tree "$@"'
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filter_tag_name=
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filter_subdir=
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orig_namespace=refs/original/
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force=
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while case "$#" in 0) usage;; esac
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do
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case "$1" in
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--)
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shift
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break
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;;
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--force|-f)
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shift
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force=t
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continue
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;;
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-*)
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;;
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*)
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break;
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esac
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# all switches take one argument
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ARG="$1"
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case "$#" in 1) usage ;; esac
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shift
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OPTARG="$1"
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shift
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case "$ARG" in
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-d)
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tempdir="$OPTARG"
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;;
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--env-filter)
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filter_env="$OPTARG"
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;;
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--tree-filter)
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filter_tree="$OPTARG"
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;;
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--index-filter)
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filter_index="$OPTARG"
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;;
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--parent-filter)
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filter_parent="$OPTARG"
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;;
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--msg-filter)
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filter_msg="$OPTARG"
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;;
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--commit-filter)
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filter_commit="$OPTARG"
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;;
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--tag-name-filter)
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filter_tag_name="$OPTARG"
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;;
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--subdirectory-filter)
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filter_subdir="$OPTARG"
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;;
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--original)
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orig_namespace="$OPTARG"
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;;
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*)
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usage
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;;
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esac
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done
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case "$force" in
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t)
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rm -rf "$tempdir"
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;;
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'')
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test -d "$tempdir" &&
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die "$tempdir already exists, please remove it"
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esac
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mkdir -p "$tempdir/t" &&
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tempdir="$(cd "$tempdir"; pwd)" &&
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cd "$tempdir/t" &&
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workdir="$(pwd)" ||
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die ""
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# Make sure refs/original is empty
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git for-each-ref > "$tempdir"/backup-refs
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while read sha1 type name
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do
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case "$force,$name" in
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,$orig_namespace*)
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die "Namespace $orig_namespace not empty"
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;;
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t,$orig_namespace*)
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git update-ref -d "$name" $sha1
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;;
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esac
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done < "$tempdir"/backup-refs
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export GIT_DIR GIT_WORK_TREE=.
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# These refs should be updated if their heads were rewritten
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git rev-parse --revs-only --symbolic "$@" |
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while read ref
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do
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# normalize ref
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case "$ref" in
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HEAD)
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ref="$(git symbolic-ref "$ref")"
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;;
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refs/*)
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;;
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*)
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ref="$(git for-each-ref --format='%(refname)' |
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grep /"$ref")"
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esac
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git check-ref-format "$ref" && echo "$ref"
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done > "$tempdir"/heads
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test -s "$tempdir"/heads ||
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die "Which ref do you want to rewrite?"
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export GIT_INDEX_FILE="$(pwd)/../index"
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git read-tree || die "Could not seed the index"
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ret=0
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# map old->new commit ids for rewriting parents
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mkdir ../map || die "Could not create map/ directory"
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case "$filter_subdir" in
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"")
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git rev-list --reverse --topo-order --default HEAD \
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--parents "$@"
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;;
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*)
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git rev-list --reverse --topo-order --default HEAD \
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--parents --full-history "$@" -- "$filter_subdir"
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esac > ../revs || die "Could not get the commits"
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commits=$(wc -l <../revs | tr -d " ")
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test $commits -eq 0 && die "Found nothing to rewrite"
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# Rewrite the commits
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i=0
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while read commit parents; do
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i=$(($i+1))
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printf "\rRewrite $commit ($i/$commits)"
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case "$filter_subdir" in
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"")
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git read-tree -i -m $commit
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;;
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*)
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git read-tree -i -m $commit:"$filter_subdir"
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esac || die "Could not initialize the index"
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export GIT_COMMIT=$commit
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git cat-file commit "$commit" >../commit ||
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die "Cannot read commit $commit"
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eval "$(set_ident AUTHOR <../commit)" ||
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die "setting author failed for commit $commit"
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eval "$(set_ident COMMITTER <../commit)" ||
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die "setting committer failed for commit $commit"
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eval "$filter_env" < /dev/null ||
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die "env filter failed: $filter_env"
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if [ "$filter_tree" ]; then
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git checkout-index -f -u -a ||
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die "Could not checkout the index"
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# files that $commit removed are now still in the working tree;
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# remove them, else they would be added again
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git ls-files -z --others | xargs -0 rm -f
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eval "$filter_tree" < /dev/null ||
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die "tree filter failed: $filter_tree"
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git diff-index -r $commit | cut -f 2- | tr '\n' '\0' | \
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xargs -0 git update-index --add --replace --remove
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git ls-files -z --others | \
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xargs -0 git update-index --add --replace --remove
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fi
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eval "$filter_index" < /dev/null ||
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die "index filter failed: $filter_index"
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parentstr=
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for parent in $parents; do
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for reparent in $(map "$parent"); do
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parentstr="$parentstr -p $reparent"
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done
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done
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if [ "$filter_parent" ]; then
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parentstr="$(echo "$parentstr" | eval "$filter_parent")" ||
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die "parent filter failed: $filter_parent"
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fi
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sed -e '1,/^$/d' <../commit | \
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eval "$filter_msg" > ../message ||
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die "msg filter failed: $filter_msg"
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sh -c "$filter_commit" "git commit-tree" \
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$(git write-tree) $parentstr < ../message > ../map/$commit
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done <../revs
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# In case of a subdirectory filter, it is possible that a specified head
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# is not in the set of rewritten commits, because it was pruned by the
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# revision walker. Fix it by mapping these heads to the next rewritten
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# ancestor(s), i.e. the boundaries in the set of rewritten commits.
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# NEEDSWORK: we should sort the unmapped refs topologically first
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while read ref
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do
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sha1=$(git rev-parse "$ref"^0)
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test -f "$workdir"/../map/$sha1 && continue
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# Assign the boundarie(s) in the set of rewritten commits
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# as the replacement commit(s).
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# (This would look a bit nicer if --not --stdin worked.)
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for p in $( (cd "$workdir"/../map; ls | sed "s/^/^/") |
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git rev-list $ref --boundary --stdin |
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sed -n "s/^-//p")
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do
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map $p >> "$workdir"/../map/$sha1
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done
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done < "$tempdir"/heads
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# Finally update the refs
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_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
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_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
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count=0
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echo
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while read ref
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do
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# avoid rewriting a ref twice
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test -f "$orig_namespace$ref" && continue
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sha1=$(git rev-parse "$ref"^0)
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rewritten=$(map $sha1)
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test $sha1 = "$rewritten" &&
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warn "WARNING: Ref '$ref' is unchanged" &&
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continue
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case "$rewritten" in
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'')
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echo "Ref '$ref' was deleted"
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git update-ref -m "filter-branch: delete" -d "$ref" $sha1 ||
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die "Could not delete $ref"
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;;
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$_x40)
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echo "Ref '$ref' was rewritten"
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git update-ref -m "filter-branch: rewrite" \
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"$ref" $rewritten $sha1 ||
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die "Could not rewrite $ref"
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;;
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*)
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# NEEDSWORK: possibly add -Werror, making this an error
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warn "WARNING: '$ref' was rewritten into multiple commits:"
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warn "$rewritten"
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warn "WARNING: Ref '$ref' points to the first one now."
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rewritten=$(echo "$rewritten" | head -n 1)
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git update-ref -m "filter-branch: rewrite to first" \
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"$ref" $rewritten $sha1 ||
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die "Could not rewrite $ref"
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;;
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esac
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git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1
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count=$(($count+1))
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done < "$tempdir"/heads
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# TODO: This should possibly go, with the semantics that all positive given
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# refs are updated, and their original heads stored in refs/original/
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# Filter tags
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if [ "$filter_tag_name" ]; then
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git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |
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while read sha1 type ref; do
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ref="${ref#refs/tags/}"
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# XXX: Rewrite tagged trees as well?
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if [ "$type" != "commit" -a "$type" != "tag" ]; then
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continue;
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fi
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if [ "$type" = "tag" ]; then
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# Dereference to a commit
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sha1t="$sha1"
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sha1="$(git rev-parse "$sha1"^{commit} 2>/dev/null)" || continue
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fi
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[ -f "../map/$sha1" ] || continue
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new_sha1="$(cat "../map/$sha1")"
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export GIT_COMMIT="$sha1"
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new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
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die "tag name filter failed: $filter_tag_name"
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echo "$ref -> $new_ref ($sha1 -> $new_sha1)"
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if [ "$type" = "tag" ]; then
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# Warn that we are not rewriting the tag object itself.
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warn "unreferencing tag object $sha1t"
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fi
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git update-ref "refs/tags/$new_ref" "$new_sha1" ||
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die "Could not write tag $new_ref"
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done
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fi
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cd ../..
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rm -rf "$tempdir"
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echo
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test $count -gt 0 && echo "These refs were rewritten:"
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git show-ref | grep ^"$orig_namespace"
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exit $ret
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