mirror of
https://github.com/git/git
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83e355a62c
It used to be a single, huge line, badly wrapped by xterm. Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
493 lines
12 KiB
Bash
Executable file
493 lines
12 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 "$1";
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shift;
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done;
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}
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# if you run 'git_commit_non_empty_tree "$@"' in a commit filter,
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# it will skip commits that leave the tree untouched, commit the other.
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git_commit_non_empty_tree()
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{
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if test $# = 3 && test "$1" = $(git rev-parse "$3^{tree}"); then
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map "$3"
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else
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git commit-tree "$@"
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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 "$*" >&2
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exit 1
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}
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EOF
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)
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eval "$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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if [ "$(is_bare_repository)" = false ]; then
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git diff-files --ignore-submodules --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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fi
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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=
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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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prune_empty=
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while :
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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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--prune-empty)
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shift
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prune_empty=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/" : '\(.*[^/]\)/*$')/
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;;
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*)
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usage
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;;
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esac
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done
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case "$prune_empty,$filter_commit" in
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,)
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filter_commit='git commit-tree "$@"';;
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t,)
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filter_commit="$functions;"' git_commit_non_empty_tree "$@"';;
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,*)
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;;
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*)
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die "Cannot set --prune-empty and --filter-commit at the same time"
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esac
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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="$(pwd)" ||
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die ""
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# Remove tempdir on exit
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trap 'cd ../..; rm -rf "$tempdir"' 0
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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="$GIT_INDEX_FILE"
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GIT_WORK_TREE=.
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export GIT_DIR GIT_WORK_TREE
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# Make sure refs/original is empty
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git for-each-ref > "$tempdir"/backup-refs || exit
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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 "Cannot create a new backup.
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A previous backup already exists in $orig_namespace
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Force overwriting the backup with -f"
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;;
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t,$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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# The refs should be updated if their heads were rewritten
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git rev-parse --no-flags --revs-only --symbolic-full-name \
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--default HEAD "$@" > "$tempdir"/raw-heads || exit
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sed -e '/^^/d' "$tempdir"/raw-heads >"$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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# 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 "$filter_subdir" in
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"")
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git rev-list --reverse --topo-order --default HEAD \
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--parents --simplify-merges "$@"
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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 --simplify-merges "$@" -- "$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 $commits -eq 0 && die "Found nothing to rewrite"
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# Rewrite the commits
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git_filter_branch__commit_count=0
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while read commit parents; do
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git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1))
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printf "\rRewrite $commit ($git_filter_branch__commit_count/$commits)"
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case "$filter_subdir" in
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"")
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git read-tree -i -m $commit
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;;
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*)
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# The commit may not have the subdirectory at all
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err=$(git read-tree -i -m $commit:"$filter_subdir" 2>&1) || {
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if ! git rev-parse -q --verify $commit:"$filter_subdir"
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then
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rm -f "$GIT_INDEX_FILE"
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else
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echo >&2 "$err"
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false
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fi
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}
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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 $commit removed are now still in the working tree;
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# remove them, else they would be added again
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git clean -d -q -f -x
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eval "$filter_tree" < /dev/null ||
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die "tree filter failed: $filter_tree"
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(
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git diff-index -r --name-only $commit &&
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git ls-files --others
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) > "$tempdir"/tree-state || exit
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git update-index --add --replace --remove --stdin \
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< "$tempdir"/tree-state || exit
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fi
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eval "$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: $filter_msg"
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@SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
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$(git write-tree) $parentstr < ../message > ../map/$commit ||
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die "could not write rewritten 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 unique nearest
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# ancestor that survived the pruning.
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if test "$filter_subdir"
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then
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while read ref
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do
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sha1=$(git rev-parse "$ref"^0)
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test -f "$workdir"/../map/$sha1 && continue
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ancestor=$(git rev-list --simplify-merges -1 \
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$ref -- "$filter_subdir")
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test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1
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done < "$tempdir"/heads
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fi
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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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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 '$ref' was rewritten"
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if ! git update-ref -m "filter-branch: rewrite" \
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"$ref" $rewritten $sha1 2>/dev/null; then
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if test $(git cat-file -t "$ref") = tag; then
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if test -z "$filter_tag_name"; then
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warn "WARNING: You said to rewrite tagged commits, but not the corresponding tag."
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warn "WARNING: Perhaps use '--tag-name-filter cat' to rewrite the tag."
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fi
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else
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die "Could not rewrite $ref"
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fi
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fi
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;;
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*)
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# NEEDSWORK: possibly add -Werror, making this an error
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warn "WARNING: '$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" $sha1 ||
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exit
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done < "$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="$(git rev-parse -q "$sha1"^{commit})" || 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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new_sha1=$( ( printf 'object %s\ntype commit\ntag %s\n' \
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"$new_sha1" "$new_ref"
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git cat-file tag "$ref" |
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sed -n \
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-e "1,/^$/{
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/^object /d
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/^type /d
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/^tag /d
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}" \
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-e '/^-----BEGIN PGP SIGNATURE-----/q' \
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-e 'p' ) |
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git mktag) ||
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die "Could not create new tag object for $ref"
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if git cat-file tag "$ref" | \
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grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
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then
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warn "gpg signature stripped from tag object $sha1t"
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fi
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fi
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git update-ref "refs/tags/$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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trap - 0
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unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
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test -z "$ORIG_GIT_DIR" || {
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GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
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}
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test -z "$ORIG_GIT_WORK_TREE" || {
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GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" &&
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export GIT_WORK_TREE
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}
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test -z "$ORIG_GIT_INDEX_FILE" || {
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GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
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export GIT_INDEX_FILE
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}
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if [ "$(is_bare_repository)" = false ]; then
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git read-tree -u -m HEAD || exit
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fi
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exit 0
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