mirror of
https://github.com/git/git.git
synced 2024-12-15 04:46:02 +08:00
e336afdfb6
Update the documentation for "git filter-branch" so that the filter options are listed in the same order as they are applied, as described in an earlier part of the doc. * dg/filter-branch-filter-order-doc: doc: list filter-branch subdirectory-filter first
650 lines
15 KiB
Bash
Executable File
650 lines
15 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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elif test $# = 1 && test "$1" = 4b825dc642cb6eb9a060e54bf8d69288fbee4904; then
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:
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else
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git commit-tree "$@"
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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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finish_ident() {
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# Ensure non-empty id name.
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echo "case \"\$GIT_$1_NAME\" in \"\") GIT_$1_NAME=\"\${GIT_$1_EMAIL%%@*}\" && export GIT_$1_NAME;; esac"
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# And make sure everything is exported.
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echo "export GIT_$1_NAME"
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echo "export GIT_$1_EMAIL"
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echo "export GIT_$1_DATE"
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}
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set_ident () {
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parse_ident_from_commit author AUTHOR committer COMMITTER
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finish_ident AUTHOR
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finish_ident COMMITTER
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}
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USAGE="[--setup <command>] [--subdirectory-filter <directory>] [--env-filter <command>]
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[--tree-filter <command>] [--index-filter <command>]
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[--parent-filter <command>] [--msg-filter <command>]
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[--commit-filter <command>] [--tag-name-filter <command>]
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[--original <namespace>]
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[-d <directory>] [-f | --force] [--state-branch <branch>]
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[--] [<rev-list options>...]"
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OPTIONS_SPEC=
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. git-sh-setup
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if [ "$(is_bare_repository)" = false ]; then
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require_clean_work_tree 'rewrite branches'
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fi
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tempdir=.git-rewrite
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filter_setup=
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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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state_branch=
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orig_namespace=refs/original/
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force=
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prune_empty=
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remap_to_ancestor=
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while :
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do
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case "$1" in
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--)
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shift
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break
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;;
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--force|-f)
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shift
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force=t
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continue
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;;
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--remap-to-ancestor)
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# deprecated ($remap_to_ancestor is set now automatically)
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shift
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remap_to_ancestor=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="$OPTARG"
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;;
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--setup)
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filter_setup="$OPTARG"
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;;
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--subdirectory-filter)
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filter_subdir="$OPTARG"
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remap_to_ancestor=t
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;;
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--env-filter)
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filter_env="$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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--original)
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orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/
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;;
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--state-branch)
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state_branch="$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 "$@"';;
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,*)
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;;
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*)
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die "Cannot set --prune-empty and --commit-filter at the same time"
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esac
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case "$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 "$tempdir already exists, please remove it"
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esac
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orig_dir=$(pwd)
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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="$(pwd)" ||
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die ""
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# Remove tempdir on exit
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trap 'cd "$orig_dir"; 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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ORIG_GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME"
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ORIG_GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL"
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ORIG_GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE"
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ORIG_GIT_COMMITTER_NAME="$GIT_COMMITTER_NAME"
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ORIG_GIT_COMMITTER_EMAIL="$GIT_COMMITTER_EMAIL"
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ORIG_GIT_COMMITTER_DATE="$GIT_COMMITTER_DATE"
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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 "$tempdir"/heads ||
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die "You must specify a ref to rewrite."
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GIT_INDEX_FILE="$(pwd)/../index"
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export GIT_INDEX_FILE
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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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if test -n "$state_branch"
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then
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state_commit=$(git rev-parse --no-flags --revs-only "$state_branch")
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if test -n "$state_commit"
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then
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echo "Populating map from $state_branch ($state_commit)" 1>&2
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perl -e'open(MAP, "-|", "git show $ARGV[0]:filter.map") or die;
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while (<MAP>) {
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m/(.*):(.*)/ or die;
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open F, ">../map/$1" or die;
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print F "$2" or die;
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close(F) or die;
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}
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close(MAP) or die;' "$state_commit" \
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|| die "Unable to load state from $state_branch:filter.map"
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else
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echo "Branch $state_branch does not exist. Will create" 1>&2
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fi
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fi
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# we need "--" only if there are no path arguments in $@
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nonrevs=$(git rev-parse --no-revs "$@") || exit
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if test -z "$nonrevs"
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then
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dashdash=--
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else
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dashdash=
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remap_to_ancestor=t
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fi
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git rev-parse --revs-only "$@" >../parse
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case "$filter_subdir" in
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"")
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eval set -- "$(git rev-parse --sq --no-revs "$@")"
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;;
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*)
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eval set -- "$(git rev-parse --sq --no-revs "$@" $dashdash \
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"$filter_subdir")"
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;;
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esac
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git rev-list --reverse --topo-order --default HEAD \
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--parents --simplify-merges --stdin "$@" <../parse >../revs ||
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die "Could not get the commits"
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commits=$(wc -l <../revs | tr -d " ")
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test $commits -eq 0 && die "Found nothing to rewrite"
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# Rewrite the commits
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report_progress ()
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{
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if test -n "$progress" &&
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test $git_filter_branch__commit_count -gt $next_sample_at
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then
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count=$git_filter_branch__commit_count
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now=$(date +%s)
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elapsed=$(($now - $start_timestamp))
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remaining=$(( ($commits - $count) * $elapsed / $count ))
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if test $elapsed -gt 0
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then
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next_sample_at=$(( ($elapsed + 1) * $count / $elapsed ))
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else
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next_sample_at=$(($next_sample_at + 1))
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fi
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progress=" ($elapsed seconds passed, remaining $remaining predicted)"
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fi
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printf "\rRewrite $commit ($count/$commits)$progress "
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}
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git_filter_branch__commit_count=0
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progress= start_timestamp=
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if date '+%s' 2>/dev/null | grep -q '^[0-9][0-9]*$'
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then
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next_sample_at=0
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progress="dummy to ensure this is not empty"
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start_timestamp=$(date '+%s')
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fi
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if test -n "$filter_index" ||
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test -n "$filter_tree" ||
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test -n "$filter_subdir"
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then
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need_index=t
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else
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need_index=
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fi
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eval "$filter_setup" < /dev/null ||
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die "filter setup failed: $filter_setup"
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while read commit parents; do
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git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1))
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report_progress
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case "$filter_subdir" in
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"")
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if test -n "$need_index"
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then
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GIT_ALLOW_NULL_SHA1=1 git read-tree -i -m $commit
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fi
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;;
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*)
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# The commit may not have the subdirectory at all
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err=$(GIT_ALLOW_NULL_SHA1=1 \
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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 <../commit)" ||
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die "setting author/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 --ignore-submodules $commit -- &&
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git ls-files --others
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) > "$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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case "$parentstr " in
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*" -p $reparent "*)
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;;
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*)
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parentstr="$parentstr -p $reparent"
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;;
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esac
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done
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done
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if [ "$filter_parent" ]; then
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parentstr="$(echo "$parentstr" | eval "$filter_parent")" ||
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die "parent filter failed: $filter_parent"
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fi
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{
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while IFS='' read -r header_line && test -n "$header_line"
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do
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# skip header lines...
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:;
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done
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# and output the actual commit message
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cat
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} <../commit |
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eval "$filter_msg" > ../message ||
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die "msg filter failed: $filter_msg"
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if test -n "$need_index"
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then
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tree=$(git write-tree)
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else
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tree=$(git rev-parse "$commit^{tree}")
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fi
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workdir=$workdir @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
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"$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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# If we are filtering for paths, as in the case of a subdirectory
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# filter, it is possible that a specified head is not in the set of
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# rewritten commits, because it was pruned by the revision walker.
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# Ancestor remapping fixes this by mapping these heads to the unique
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# nearest ancestor that survived the pruning.
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if test "$remap_to_ancestor" = t
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then
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while read ref
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do
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sha1=$(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 "$ref" "$@")
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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/$sha1")"
|
|
GIT_COMMIT="$sha1"
|
|
export GIT_COMMIT
|
|
new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
|
|
die "tag name filter failed: $filter_tag_name"
|
|
|
|
echo "$ref -> $new_ref ($sha1 -> $new_sha1)"
|
|
|
|
if [ "$type" = "tag" ]; then
|
|
new_sha1=$( ( printf 'object %s\ntype commit\ntag %s\n' \
|
|
"$new_sha1" "$new_ref"
|
|
git cat-file tag "$ref" |
|
|
sed -n \
|
|
-e '1,/^$/{
|
|
/^object /d
|
|
/^type /d
|
|
/^tag /d
|
|
}' \
|
|
-e '/^-----BEGIN PGP SIGNATURE-----/q' \
|
|
-e 'p' ) |
|
|
git hash-object -t tag -w --stdin) ||
|
|
die "Could not create new tag object for $ref"
|
|
if git cat-file tag "$ref" | \
|
|
sane_grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
|
|
then
|
|
warn "gpg signature stripped from tag object $sha1t"
|
|
fi
|
|
fi
|
|
|
|
git update-ref "refs/tags/$new_ref" "$new_sha1" ||
|
|
die "Could not write tag $new_ref"
|
|
done
|
|
fi
|
|
|
|
unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
|
|
unset GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
|
|
unset GIT_COMMITTER_NAME GIT_COMMITTER_EMAIL GIT_COMMITTER_DATE
|
|
test -z "$ORIG_GIT_DIR" || {
|
|
GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
|
|
}
|
|
test -z "$ORIG_GIT_WORK_TREE" || {
|
|
GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" &&
|
|
export GIT_WORK_TREE
|
|
}
|
|
test -z "$ORIG_GIT_INDEX_FILE" || {
|
|
GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
|
|
export GIT_INDEX_FILE
|
|
}
|
|
test -z "$ORIG_GIT_AUTHOR_NAME" || {
|
|
GIT_AUTHOR_NAME="$ORIG_GIT_AUTHOR_NAME" &&
|
|
export GIT_AUTHOR_NAME
|
|
}
|
|
test -z "$ORIG_GIT_AUTHOR_EMAIL" || {
|
|
GIT_AUTHOR_EMAIL="$ORIG_GIT_AUTHOR_EMAIL" &&
|
|
export GIT_AUTHOR_EMAIL
|
|
}
|
|
test -z "$ORIG_GIT_AUTHOR_DATE" || {
|
|
GIT_AUTHOR_DATE="$ORIG_GIT_AUTHOR_DATE" &&
|
|
export GIT_AUTHOR_DATE
|
|
}
|
|
test -z "$ORIG_GIT_COMMITTER_NAME" || {
|
|
GIT_COMMITTER_NAME="$ORIG_GIT_COMMITTER_NAME" &&
|
|
export GIT_COMMITTER_NAME
|
|
}
|
|
test -z "$ORIG_GIT_COMMITTER_EMAIL" || {
|
|
GIT_COMMITTER_EMAIL="$ORIG_GIT_COMMITTER_EMAIL" &&
|
|
export GIT_COMMITTER_EMAIL
|
|
}
|
|
test -z "$ORIG_GIT_COMMITTER_DATE" || {
|
|
GIT_COMMITTER_DATE="$ORIG_GIT_COMMITTER_DATE" &&
|
|
export GIT_COMMITTER_DATE
|
|
}
|
|
|
|
if test -n "$state_branch"
|
|
then
|
|
echo "Saving rewrite state to $state_branch" 1>&2
|
|
state_blob=$(
|
|
perl -e'opendir D, "../map" or die;
|
|
open H, "|-", "git hash-object -w --stdin" or die;
|
|
foreach (sort readdir(D)) {
|
|
next if m/^\.\.?$/;
|
|
open F, "<../map/$_" or die;
|
|
chomp($f = <F>);
|
|
print H "$_:$f\n" or die;
|
|
}
|
|
close(H) or die;' || die "Unable to save state")
|
|
state_tree=$(/bin/echo -e "100644 blob $state_blob\tfilter.map" | git mktree)
|
|
if test -n "$state_commit"
|
|
then
|
|
state_commit=$(/bin/echo "Sync" | git commit-tree "$state_tree" -p "$state_commit")
|
|
else
|
|
state_commit=$(/bin/echo "Sync" | git commit-tree "$state_tree" )
|
|
fi
|
|
git update-ref "$state_branch" "$state_commit"
|
|
fi
|
|
|
|
cd "$orig_dir"
|
|
rm -rf "$tempdir"
|
|
|
|
trap - 0
|
|
|
|
if [ "$(is_bare_repository)" = false ]; then
|
|
git read-tree -u -m HEAD || exit
|
|
fi
|
|
|
|
exit 0
|