| #!/bin/sh |
| # |
| # Rewrite revision history |
| # Copyright (c) Petr Baudis, 2006 |
| # Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007 |
| # |
| # Lets you rewrite the revision history of the current branch, creating |
| # a new branch. You can specify a number of filters to modify the commits, |
| # files and trees. |
| |
| # The following functions will also be available in the commit filter: |
| |
| functions=$(cat << \EOF |
| warn () { |
| echo "$*" >&2 |
| } |
| |
| map() |
| { |
| # if it was not rewritten, take the original |
| if test -r "$workdir/../map/$1" |
| then |
| cat "$workdir/../map/$1" |
| else |
| echo "$1" |
| fi |
| } |
| |
| # if you run 'skip_commit "$@"' in a commit filter, it will print |
| # the (mapped) parents, effectively skipping the commit. |
| |
| skip_commit() |
| { |
| shift; |
| while [ -n "$1" ]; |
| do |
| shift; |
| map "$1"; |
| shift; |
| done; |
| } |
| |
| # if you run 'git_commit_non_empty_tree "$@"' in a commit filter, |
| # it will skip commits that leave the tree untouched, commit the other. |
| git_commit_non_empty_tree() |
| { |
| if test $# = 3 && test "$1" = $(git rev-parse "$3^{tree}"); then |
| map "$3" |
| else |
| git commit-tree "$@" |
| fi |
| } |
| # override die(): this version puts in an extra line break, so that |
| # the progress is still visible |
| |
| die() |
| { |
| echo >&2 |
| echo "$*" >&2 |
| exit 1 |
| } |
| EOF |
| ) |
| |
| eval "$functions" |
| |
| # When piped a commit, output a script to set the ident of either |
| # "author" or "committer |
| |
| set_ident () { |
| lid="$(echo "$1" | tr "[A-Z]" "[a-z]")" |
| uid="$(echo "$1" | tr "[a-z]" "[A-Z]")" |
| pick_id_script=' |
| /^'$lid' /{ |
| s/'\''/'\''\\'\'\''/g |
| h |
| s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/ |
| s/'\''/'\''\'\'\''/g |
| s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p |
| |
| g |
| s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/ |
| s/'\''/'\''\'\'\''/g |
| s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p |
| |
| g |
| s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/ |
| s/'\''/'\''\'\'\''/g |
| s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p |
| |
| q |
| } |
| ' |
| |
| LANG=C LC_ALL=C sed -ne "$pick_id_script" |
| # Ensure non-empty id name. |
| echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac" |
| } |
| |
| USAGE="[--env-filter <command>] [--tree-filter <command>] |
| [--index-filter <command>] [--parent-filter <command>] |
| [--msg-filter <command>] [--commit-filter <command>] |
| [--tag-name-filter <command>] [--subdirectory-filter <directory>] |
| [--original <namespace>] [-d <directory>] [-f | --force] |
| [<rev-list options>...]" |
| |
| OPTIONS_SPEC= |
| . git-sh-setup |
| |
| if [ "$(is_bare_repository)" = false ]; then |
| git diff-files --ignore-submodules --quiet && |
| git diff-index --cached --quiet HEAD -- || |
| die "Cannot rewrite branch(es) with a dirty working directory." |
| fi |
| |
| tempdir=.git-rewrite |
| filter_env= |
| filter_tree= |
| filter_index= |
| filter_parent= |
| filter_msg=cat |
| filter_commit= |
| filter_tag_name= |
| filter_subdir= |
| orig_namespace=refs/original/ |
| force= |
| prune_empty= |
| while : |
| do |
| case "$1" in |
| --) |
| shift |
| break |
| ;; |
| --force|-f) |
| shift |
| force=t |
| continue |
| ;; |
| --prune-empty) |
| shift |
| prune_empty=t |
| continue |
| ;; |
| -*) |
| ;; |
| *) |
| break; |
| esac |
| |
| # all switches take one argument |
| ARG="$1" |
| case "$#" in 1) usage ;; esac |
| shift |
| OPTARG="$1" |
| shift |
| |
| case "$ARG" in |
| -d) |
| tempdir="$OPTARG" |
| ;; |
| --env-filter) |
| filter_env="$OPTARG" |
| ;; |
| --tree-filter) |
| filter_tree="$OPTARG" |
| ;; |
| --index-filter) |
| filter_index="$OPTARG" |
| ;; |
| --parent-filter) |
| filter_parent="$OPTARG" |
| ;; |
| --msg-filter) |
| filter_msg="$OPTARG" |
| ;; |
| --commit-filter) |
| filter_commit="$functions; $OPTARG" |
| ;; |
| --tag-name-filter) |
| filter_tag_name="$OPTARG" |
| ;; |
| --subdirectory-filter) |
| filter_subdir="$OPTARG" |
| ;; |
| --original) |
| orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/ |
| ;; |
| *) |
| usage |
| ;; |
| esac |
| done |
| |
| case "$prune_empty,$filter_commit" in |
| ,) |
| filter_commit='git commit-tree "$@"';; |
| t,) |
| filter_commit="$functions;"' git_commit_non_empty_tree "$@"';; |
| ,*) |
| ;; |
| *) |
| die "Cannot set --prune-empty and --filter-commit at the same time" |
| esac |
| |
| case "$force" in |
| t) |
| rm -rf "$tempdir" |
| ;; |
| '') |
| test -d "$tempdir" && |
| die "$tempdir already exists, please remove it" |
| esac |
| mkdir -p "$tempdir/t" && |
| tempdir="$(cd "$tempdir"; pwd)" && |
| cd "$tempdir/t" && |
| workdir="$(pwd)" || |
| die "" |
| |
| # Remove tempdir on exit |
| trap 'cd ../..; rm -rf "$tempdir"' 0 |
| |
| ORIG_GIT_DIR="$GIT_DIR" |
| ORIG_GIT_WORK_TREE="$GIT_WORK_TREE" |
| ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE" |
| GIT_WORK_TREE=. |
| export GIT_DIR GIT_WORK_TREE |
| |
| # Make sure refs/original is empty |
| git for-each-ref > "$tempdir"/backup-refs || exit |
| while read sha1 type name |
| do |
| case "$force,$name" in |
| ,$orig_namespace*) |
| die "Cannot create a new backup. |
| A previous backup already exists in $orig_namespace |
| Force overwriting the backup with -f" |
| ;; |
| t,$orig_namespace*) |
| git update-ref -d "$name" $sha1 |
| ;; |
| esac |
| done < "$tempdir"/backup-refs |
| |
| # The refs should be updated if their heads were rewritten |
| git rev-parse --no-flags --revs-only --symbolic-full-name \ |
| --default HEAD "$@" > "$tempdir"/raw-heads || exit |
| sed -e '/^^/d' "$tempdir"/raw-heads >"$tempdir"/heads |
| |
| test -s "$tempdir"/heads || |
| die "Which ref do you want to rewrite?" |
| |
| GIT_INDEX_FILE="$(pwd)/../index" |
| export GIT_INDEX_FILE |
| git read-tree || die "Could not seed the index" |
| |
| # map old->new commit ids for rewriting parents |
| mkdir ../map || die "Could not create map/ directory" |
| |
| case "$filter_subdir" in |
| "") |
| git rev-list --reverse --topo-order --default HEAD \ |
| --parents --simplify-merges "$@" |
| ;; |
| *) |
| git rev-list --reverse --topo-order --default HEAD \ |
| --parents --simplify-merges "$@" -- "$filter_subdir" |
| esac > ../revs || die "Could not get the commits" |
| commits=$(wc -l <../revs | tr -d " ") |
| |
| test $commits -eq 0 && die "Found nothing to rewrite" |
| |
| # Rewrite the commits |
| |
| git_filter_branch__commit_count=0 |
| while read commit parents; do |
| git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1)) |
| printf "\rRewrite $commit ($git_filter_branch__commit_count/$commits)" |
| |
| case "$filter_subdir" in |
| "") |
| git read-tree -i -m $commit |
| ;; |
| *) |
| # The commit may not have the subdirectory at all |
| err=$(git read-tree -i -m $commit:"$filter_subdir" 2>&1) || { |
| if ! git rev-parse -q --verify $commit:"$filter_subdir" |
| then |
| rm -f "$GIT_INDEX_FILE" |
| else |
| echo >&2 "$err" |
| false |
| fi |
| } |
| esac || die "Could not initialize the index" |
| |
| GIT_COMMIT=$commit |
| export GIT_COMMIT |
| git cat-file commit "$commit" >../commit || |
| die "Cannot read commit $commit" |
| |
| eval "$(set_ident AUTHOR <../commit)" || |
| die "setting author failed for commit $commit" |
| eval "$(set_ident COMMITTER <../commit)" || |
| die "setting committer failed for commit $commit" |
| eval "$filter_env" < /dev/null || |
| die "env filter failed: $filter_env" |
| |
| if [ "$filter_tree" ]; then |
| git checkout-index -f -u -a || |
| die "Could not checkout the index" |
| # files that $commit removed are now still in the working tree; |
| # remove them, else they would be added again |
| git clean -d -q -f -x |
| eval "$filter_tree" < /dev/null || |
| die "tree filter failed: $filter_tree" |
| |
| ( |
| git diff-index -r --name-only $commit && |
| git ls-files --others |
| ) > "$tempdir"/tree-state || exit |
| git update-index --add --replace --remove --stdin \ |
| < "$tempdir"/tree-state || exit |
| fi |
| |
| eval "$filter_index" < /dev/null || |
| die "index filter failed: $filter_index" |
| |
| parentstr= |
| for parent in $parents; do |
| for reparent in $(map "$parent"); do |
| parentstr="$parentstr -p $reparent" |
| done |
| done |
| if [ "$filter_parent" ]; then |
| parentstr="$(echo "$parentstr" | eval "$filter_parent")" || |
| die "parent filter failed: $filter_parent" |
| fi |
| |
| sed -e '1,/^$/d' <../commit | \ |
| eval "$filter_msg" > ../message || |
| die "msg filter failed: $filter_msg" |
| @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \ |
| $(git write-tree) $parentstr < ../message > ../map/$commit || |
| die "could not write rewritten commit" |
| done <../revs |
| |
| # In case of a subdirectory filter, it is possible that a specified head |
| # is not in the set of rewritten commits, because it was pruned by the |
| # revision walker. Fix it by mapping these heads to the unique nearest |
| # ancestor that survived the pruning. |
| |
| if test "$filter_subdir" |
| then |
| while read ref |
| do |
| sha1=$(git rev-parse "$ref"^0) |
| test -f "$workdir"/../map/$sha1 && continue |
| ancestor=$(git rev-list --simplify-merges -1 \ |
| $ref -- "$filter_subdir") |
| test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1 |
| done < "$tempdir"/heads |
| fi |
| |
| # Finally update the refs |
| |
| _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]' |
| _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40" |
| echo |
| while read ref |
| do |
| # avoid rewriting a ref twice |
| test -f "$orig_namespace$ref" && continue |
| |
| sha1=$(git rev-parse "$ref"^0) |
| rewritten=$(map $sha1) |
| |
| test $sha1 = "$rewritten" && |
| warn "WARNING: Ref '$ref' is unchanged" && |
| continue |
| |
| case "$rewritten" in |
| '') |
| echo "Ref '$ref' was deleted" |
| git update-ref -m "filter-branch: delete" -d "$ref" $sha1 || |
| die "Could not delete $ref" |
| ;; |
| $_x40) |
| echo "Ref '$ref' was rewritten" |
| if ! git update-ref -m "filter-branch: rewrite" \ |
| "$ref" $rewritten $sha1 2>/dev/null; then |
| if test $(git cat-file -t "$ref") = tag; then |
| if test -z "$filter_tag_name"; then |
| warn "WARNING: You said to rewrite tagged commits, but not the corresponding tag." |
| warn "WARNING: Perhaps use '--tag-name-filter cat' to rewrite the tag." |
| fi |
| else |
| die "Could not rewrite $ref" |
| fi |
| fi |
| ;; |
| *) |
| # NEEDSWORK: possibly add -Werror, making this an error |
| warn "WARNING: '$ref' was rewritten into multiple commits:" |
| warn "$rewritten" |
| warn "WARNING: Ref '$ref' points to the first one now." |
| rewritten=$(echo "$rewritten" | head -n 1) |
| git update-ref -m "filter-branch: rewrite to first" \ |
| "$ref" $rewritten $sha1 || |
| die "Could not rewrite $ref" |
| ;; |
| esac |
| git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1 || |
| exit |
| done < "$tempdir"/heads |
| |
| # TODO: This should possibly go, with the semantics that all positive given |
| # refs are updated, and their original heads stored in refs/original/ |
| # Filter tags |
| |
| if [ "$filter_tag_name" ]; then |
| git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags | |
| while read sha1 type ref; do |
| ref="${ref#refs/tags/}" |
| # XXX: Rewrite tagged trees as well? |
| if [ "$type" != "commit" -a "$type" != "tag" ]; then |
| continue; |
| fi |
| |
| if [ "$type" = "tag" ]; then |
| # Dereference to a commit |
| sha1t="$sha1" |
| sha1="$(git rev-parse -q "$sha1"^{commit})" || continue |
| fi |
| |
| [ -f "../map/$sha1" ] || continue |
| new_sha1="$(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 mktag) || |
| die "Could not create new tag object for $ref" |
| if git cat-file tag "$ref" | \ |
| 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 $new_ref" |
| done |
| fi |
| |
| cd ../.. |
| rm -rf "$tempdir" |
| |
| trap - 0 |
| |
| unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE |
| 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 |
| } |
| |
| if [ "$(is_bare_repository)" = false ]; then |
| git read-tree -u -m HEAD || exit |
| fi |
| |
| exit 0 |