Andrew's git / gitweb.git / git-filter-branch.sh
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git-filter-branch.shon commit filter-branch.sh: remove temporary directory on failure (def16e7)
   1#!/bin/sh
   2#
   3# Rewrite revision history
   4# Copyright (c) Petr Baudis, 2006
   5# Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007
   6#
   7# Lets you rewrite the revision history of the current branch, creating
   8# a new branch. You can specify a number of filters to modify the commits,
   9# files and trees.
  10
  11# The following functions will also be available in the commit filter:
  12
  13functions=$(cat << \EOF
  14warn () {
  15        echo "$*" >&2
  16}
  17
  18map()
  19{
  20        # if it was not rewritten, take the original
  21        if test -r "$workdir/../map/$1"
  22        then
  23                cat "$workdir/../map/$1"
  24        else
  25                echo "$1"
  26        fi
  27}
  28
  29# if you run 'skip_commit "$@"' in a commit filter, it will print
  30# the (mapped) parents, effectively skipping the commit.
  31
  32skip_commit()
  33{
  34        shift;
  35        while [ -n "$1" ];
  36        do
  37                shift;
  38                map "$1";
  39                shift;
  40        done;
  41}
  42
  43# override die(): this version puts in an extra line break, so that
  44# the progress is still visible
  45
  46die()
  47{
  48        echo >&2
  49        echo "$*" >&2
  50        exit 1
  51}
  52EOF
  53)
  54
  55eval "$functions"
  56
  57# When piped a commit, output a script to set the ident of either
  58# "author" or "committer
  59
  60set_ident () {
  61        lid="$(echo "$1" | tr "A-Z" "a-z")"
  62        uid="$(echo "$1" | tr "a-z" "A-Z")"
  63        pick_id_script='
  64                /^'$lid' /{
  65                        s/'\''/'\''\\'\'\''/g
  66                        h
  67                        s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
  68                        s/'\''/'\''\'\'\''/g
  69                        s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p
  70
  71                        g
  72                        s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
  73                        s/'\''/'\''\'\'\''/g
  74                        s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p
  75
  76                        g
  77                        s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
  78                        s/'\''/'\''\'\'\''/g
  79                        s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p
  80
  81                        q
  82                }
  83        '
  84
  85        LANG=C LC_ALL=C sed -ne "$pick_id_script"
  86        # Ensure non-empty id name.
  87        echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
  88}
  89
  90USAGE="[--env-filter <command>] [--tree-filter <command>] \
  91[--index-filter <command>] [--parent-filter <command>] \
  92[--msg-filter <command>] [--commit-filter <command>] \
  93[--tag-name-filter <command>] [--subdirectory-filter <directory>] \
  94[--original <namespace>] [-d <directory>] [-f | --force] \
  95[<rev-list options>...]"
  96
  97OPTIONS_SPEC=
  98. git-sh-setup
  99
 100git diff-files --quiet &&
 101        git diff-index --cached --quiet HEAD -- ||
 102        die "Cannot rewrite branch(es) with a dirty working directory."
 103
 104tempdir=.git-rewrite
 105filter_env=
 106filter_tree=
 107filter_index=
 108filter_parent=
 109filter_msg=cat
 110filter_commit='git commit-tree "$@"'
 111filter_tag_name=
 112filter_subdir=
 113orig_namespace=refs/original/
 114force=
 115while :
 116do
 117        test $# = 0 && usage
 118        case "$1" in
 119        --)
 120                shift
 121                break
 122                ;;
 123        --force|-f)
 124                shift
 125                force=t
 126                continue
 127                ;;
 128        -*)
 129                ;;
 130        *)
 131                break;
 132        esac
 133
 134        # all switches take one argument
 135        ARG="$1"
 136        case "$#" in 1) usage ;; esac
 137        shift
 138        OPTARG="$1"
 139        shift
 140
 141        case "$ARG" in
 142        -d)
 143                tempdir="$OPTARG"
 144                ;;
 145        --env-filter)
 146                filter_env="$OPTARG"
 147                ;;
 148        --tree-filter)
 149                filter_tree="$OPTARG"
 150                ;;
 151        --index-filter)
 152                filter_index="$OPTARG"
 153                ;;
 154        --parent-filter)
 155                filter_parent="$OPTARG"
 156                ;;
 157        --msg-filter)
 158                filter_msg="$OPTARG"
 159                ;;
 160        --commit-filter)
 161                filter_commit="$functions; $OPTARG"
 162                ;;
 163        --tag-name-filter)
 164                filter_tag_name="$OPTARG"
 165                ;;
 166        --subdirectory-filter)
 167                filter_subdir="$OPTARG"
 168                ;;
 169        --original)
 170                orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/
 171                ;;
 172        *)
 173                usage
 174                ;;
 175        esac
 176done
 177
 178case "$force" in
 179t)
 180        rm -rf "$tempdir"
 181;;
 182'')
 183        test -d "$tempdir" &&
 184                die "$tempdir already exists, please remove it"
 185esac
 186mkdir -p "$tempdir/t" &&
 187tempdir="$(cd "$tempdir"; pwd)" &&
 188cd "$tempdir/t" &&
 189workdir="$(pwd)" ||
 190die ""
 191
 192# Remove tempdir on exit
 193trap 'cd ../..; rm -rf "$tempdir"' 0
 194
 195# Make sure refs/original is empty
 196git for-each-ref > "$tempdir"/backup-refs
 197while read sha1 type name
 198do
 199        case "$force,$name" in
 200        ,$orig_namespace*)
 201                die "Namespace $orig_namespace not empty"
 202        ;;
 203        t,$orig_namespace*)
 204                git update-ref -d "$name" $sha1
 205        ;;
 206        esac
 207done < "$tempdir"/backup-refs
 208
 209ORIG_GIT_DIR="$GIT_DIR"
 210ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
 211ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
 212GIT_WORK_TREE=.
 213export GIT_DIR GIT_WORK_TREE
 214
 215# The refs should be updated if their heads were rewritten
 216git rev-parse --no-flags --revs-only --symbolic-full-name "$@" |
 217sed -e '/^^/d' >"$tempdir"/heads
 218
 219test -s "$tempdir"/heads ||
 220        die "Which ref do you want to rewrite?"
 221
 222GIT_INDEX_FILE="$(pwd)/../index"
 223export GIT_INDEX_FILE
 224git read-tree || die "Could not seed the index"
 225
 226ret=0
 227
 228# map old->new commit ids for rewriting parents
 229mkdir ../map || die "Could not create map/ directory"
 230
 231case "$filter_subdir" in
 232"")
 233        git rev-list --reverse --topo-order --default HEAD \
 234                --parents "$@"
 235        ;;
 236*)
 237        git rev-list --reverse --topo-order --default HEAD \
 238                --parents --full-history "$@" -- "$filter_subdir"
 239esac > ../revs || die "Could not get the commits"
 240commits=$(wc -l <../revs | tr -d " ")
 241
 242test $commits -eq 0 && die "Found nothing to rewrite"
 243
 244# Rewrite the commits
 245
 246i=0
 247while read commit parents; do
 248        i=$(($i+1))
 249        printf "\rRewrite $commit ($i/$commits)"
 250
 251        case "$filter_subdir" in
 252        "")
 253                git read-tree -i -m $commit
 254                ;;
 255        *)
 256                git read-tree -i -m $commit:"$filter_subdir"
 257        esac || die "Could not initialize the index"
 258
 259        GIT_COMMIT=$commit
 260        export GIT_COMMIT
 261        git cat-file commit "$commit" >../commit ||
 262                die "Cannot read commit $commit"
 263
 264        eval "$(set_ident AUTHOR <../commit)" ||
 265                die "setting author failed for commit $commit"
 266        eval "$(set_ident COMMITTER <../commit)" ||
 267                die "setting committer failed for commit $commit"
 268        eval "$filter_env" < /dev/null ||
 269                die "env filter failed: $filter_env"
 270
 271        if [ "$filter_tree" ]; then
 272                git checkout-index -f -u -a ||
 273                        die "Could not checkout the index"
 274                # files that $commit removed are now still in the working tree;
 275                # remove them, else they would be added again
 276                git ls-files -z --others | xargs -0 rm -f
 277                eval "$filter_tree" < /dev/null ||
 278                        die "tree filter failed: $filter_tree"
 279
 280                git diff-index -r $commit | cut -f 2- | tr '\012' '\000' | \
 281                        xargs -0 git update-index --add --replace --remove
 282                git ls-files -z --others | \
 283                        xargs -0 git update-index --add --replace --remove
 284        fi
 285
 286        eval "$filter_index" < /dev/null ||
 287                die "index filter failed: $filter_index"
 288
 289        parentstr=
 290        for parent in $parents; do
 291                for reparent in $(map "$parent"); do
 292                        parentstr="$parentstr -p $reparent"
 293                done
 294        done
 295        if [ "$filter_parent" ]; then
 296                parentstr="$(echo "$parentstr" | eval "$filter_parent")" ||
 297                                die "parent filter failed: $filter_parent"
 298        fi
 299
 300        sed -e '1,/^$/d' <../commit | \
 301                eval "$filter_msg" > ../message ||
 302                        die "msg filter failed: $filter_msg"
 303        sh -c "$filter_commit" "git commit-tree" \
 304                $(git write-tree) $parentstr < ../message > ../map/$commit
 305done <../revs
 306
 307# In case of a subdirectory filter, it is possible that a specified head
 308# is not in the set of rewritten commits, because it was pruned by the
 309# revision walker.  Fix it by mapping these heads to the next rewritten
 310# ancestor(s), i.e. the boundaries in the set of rewritten commits.
 311
 312# NEEDSWORK: we should sort the unmapped refs topologically first
 313while read ref
 314do
 315        sha1=$(git rev-parse "$ref"^0)
 316        test -f "$workdir"/../map/$sha1 && continue
 317        # Assign the boundarie(s) in the set of rewritten commits
 318        # as the replacement commit(s).
 319        # (This would look a bit nicer if --not --stdin worked.)
 320        for p in $( (cd "$workdir"/../map; ls | sed "s/^/^/") |
 321                git rev-list $ref --boundary --stdin |
 322                sed -n "s/^-//p")
 323        do
 324                map $p >> "$workdir"/../map/$sha1
 325        done
 326done < "$tempdir"/heads
 327
 328# Finally update the refs
 329
 330_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 331_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 332echo
 333while read ref
 334do
 335        # avoid rewriting a ref twice
 336        test -f "$orig_namespace$ref" && continue
 337
 338        sha1=$(git rev-parse "$ref"^0)
 339        rewritten=$(map $sha1)
 340
 341        test $sha1 = "$rewritten" &&
 342                warn "WARNING: Ref '$ref' is unchanged" &&
 343                continue
 344
 345        case "$rewritten" in
 346        '')
 347                echo "Ref '$ref' was deleted"
 348                git update-ref -m "filter-branch: delete" -d "$ref" $sha1 ||
 349                        die "Could not delete $ref"
 350        ;;
 351        $_x40)
 352                echo "Ref '$ref' was rewritten"
 353                git update-ref -m "filter-branch: rewrite" \
 354                                "$ref" $rewritten $sha1 ||
 355                        die "Could not rewrite $ref"
 356        ;;
 357        *)
 358                # NEEDSWORK: possibly add -Werror, making this an error
 359                warn "WARNING: '$ref' was rewritten into multiple commits:"
 360                warn "$rewritten"
 361                warn "WARNING: Ref '$ref' points to the first one now."
 362                rewritten=$(echo "$rewritten" | head -n 1)
 363                git update-ref -m "filter-branch: rewrite to first" \
 364                                "$ref" $rewritten $sha1 ||
 365                        die "Could not rewrite $ref"
 366        ;;
 367        esac
 368        git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1
 369done < "$tempdir"/heads
 370
 371# TODO: This should possibly go, with the semantics that all positive given
 372#       refs are updated, and their original heads stored in refs/original/
 373# Filter tags
 374
 375if [ "$filter_tag_name" ]; then
 376        git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |
 377        while read sha1 type ref; do
 378                ref="${ref#refs/tags/}"
 379                # XXX: Rewrite tagged trees as well?
 380                if [ "$type" != "commit" -a "$type" != "tag" ]; then
 381                        continue;
 382                fi
 383
 384                if [ "$type" = "tag" ]; then
 385                        # Dereference to a commit
 386                        sha1t="$sha1"
 387                        sha1="$(git rev-parse "$sha1"^{commit} 2>/dev/null)" || continue
 388                fi
 389
 390                [ -f "../map/$sha1" ] || continue
 391                new_sha1="$(cat "../map/$sha1")"
 392                GIT_COMMIT="$sha1"
 393                export GIT_COMMIT
 394                new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
 395                        die "tag name filter failed: $filter_tag_name"
 396
 397                echo "$ref -> $new_ref ($sha1 -> $new_sha1)"
 398
 399                if [ "$type" = "tag" ]; then
 400                        # Warn that we are not rewriting the tag object itself.
 401                        warn "unreferencing tag object $sha1t"
 402                fi
 403
 404                git update-ref "refs/tags/$new_ref" "$new_sha1" ||
 405                        die "Could not write tag $new_ref"
 406        done
 407fi
 408
 409cd ../..
 410rm -rf "$tempdir"
 411
 412trap - 0
 413
 414unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
 415test -z "$ORIG_GIT_DIR" || GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
 416test -z "$ORIG_GIT_WORK_TREE" || GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" &&
 417        export GIT_WORK_TREE
 418test -z "$ORIG_GIT_INDEX_FILE" || GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
 419        export GIT_INDEX_FILE
 420git read-tree -u -m HEAD
 421
 422exit $ret