mirror of
https://github.com/git/git.git
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3175b0cfc1
Some versions of 'tr' only accept octal codes if entered with three digits, and therefor misinterpret the '\0' in the test suite. Some versions of 'tr' reject the (needless) use of character classes. Signed-off-by: H.Merijn Brand <h.m.brand@xs4all.nl> Signed-off-by: Junio C Hamano <gitster@pobox.com>
439 lines
10 KiB
Bash
Executable File
439 lines
10 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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# The following functions will also be available in the commit filter:
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functions=$(cat << \EOF
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warn () {
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echo "$*" >&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 "$1"
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fi
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}
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# if you run 'skip_commit "$@"' in a commit filter, it will print
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# the (mapped) parents, effectively skipping the commit.
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skip_commit()
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{
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shift;
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while [ -n "$1" ];
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do
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shift;
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map "$1";
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shift;
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done;
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}
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# override die(): this version puts in an extra line break, so that
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# the progress is still visible
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die()
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{
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echo >&2
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echo "$*" >&2
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exit 1
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}
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EOF
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)
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eval "$functions"
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# When piped a commit, output a script to set the ident of either
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# "author" or "committer
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set_ident () {
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lid="$(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' \([^<]*\) <[^>]*> .*$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p
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g
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s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p
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g
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s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/GIT_'$uid'_DATE='\''&'\''; 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 "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
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}
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USAGE="[--env-filter <command>] [--tree-filter <command>] \
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[--index-filter <command>] [--parent-filter <command>] \
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[--msg-filter <command>] [--commit-filter <command>] \
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[--tag-name-filter <command>] [--subdirectory-filter <directory>] \
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[--original <namespace>] [-d <directory>] [-f | --force] \
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[<rev-list options>...]"
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OPTIONS_SPEC=
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. git-sh-setup
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git diff-files --quiet &&
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git diff-index --cached --quiet HEAD -- ||
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die "Cannot rewrite branch(es) with a dirty working directory."
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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 :
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do
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test $# = 0 && usage
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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="$functions; $OPTARG"
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;;
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--tag-name-filter)
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filter_tag_name="$OPTARG"
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;;
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--subdirectory-filter)
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filter_subdir="$OPTARG"
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;;
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--original)
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orig_namespace=$(expr "$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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ORIG_GIT_DIR="$GIT_DIR"
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ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
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ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
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GIT_WORK_TREE=.
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export GIT_DIR GIT_WORK_TREE
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# These refs should be updated if their heads were rewritten
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git rev-parse --revs-only --symbolic "$@" |
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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 "$tempdir"/heads ||
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die "Which ref do you want to rewrite?"
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GIT_INDEX_FILE="$(pwd)/../index"
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export GIT_INDEX_FILE
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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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GIT_COMMIT=$commit
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export GIT_COMMIT
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git cat-file commit "$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 $commit | cut -f 2- | tr '\n' '\000' | \
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xargs -0 git update-index --add --replace --remove
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git ls-files -z --others | \
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xargs -0 git update-index --add --replace --remove
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fi
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eval "$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/$sha1")"
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GIT_COMMIT="$sha1"
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export GIT_COMMIT
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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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unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
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test -z "$ORIG_GIT_DIR" || GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
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test -z "$ORIG_GIT_WORK_TREE" || GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" &&
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export GIT_WORK_TREE
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test -z "$ORIG_GIT_INDEX_FILE" || GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
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export GIT_INDEX_FILE
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git read-tree -u -m HEAD
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exit $ret
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