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8c1ce0f46b
A common mistake is to provide a filter which fails unwantedly. For example, this will stop in the middle: git filter-branch --env-filter ' test $GIT_COMMITTER_EMAIL = xyz && export GIT_COMMITTER_EMAIL = abc' rewritten When $GIT_COMMITTER_EMAIL is not "xyz", the test fails, and consequently the whole filter has a non-zero exit status. However, as demonstrated in this example, filter-branch would just stop, and the user would be none the wiser. Also, a failing msg-filter would not have been caught, as was the case with one of the tests. This patch fixes both issues, by paying attention to the exit status of msg-filter, and by saying what failed before exiting. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
289 lines
6.3 KiB
Bash
Executable File
289 lines
6.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Rewrite revision history
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# Copyright (c) Petr Baudis, 2006
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# Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007
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#
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# Lets you rewrite the revision history of the current branch, creating
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# a new branch. You can specify a number of filters to modify the commits,
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# files and trees.
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set -e
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USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] DESTBRANCH [REV-RANGE]"
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. git-sh-setup
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warn () {
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echo "$*" >&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 "$1"
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fi
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}
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# override die(): this version puts in an extra line break, so that
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# the progress is still visible
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die()
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{
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echo >&2
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echo "$*" >&2
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exit 1
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}
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# 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' \([^<]*\) <[^>]*> .*$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/export GIT_'$uid'_NAME='\''&'\''/p
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g
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s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/export GIT_'$uid'_EMAIL='\''&'\''/p
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g
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s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
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s/'\''/'\''\'\'\''/g
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s/.*/export GIT_'$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 "$pick_id_script"
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# Ensure non-empty id name.
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echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
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}
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tempdir=.git-rewrite
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filter_env=
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filter_tree=
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filter_index=
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filter_parent=
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filter_msg=cat
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filter_commit='git commit-tree "$@"'
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filter_tag_name=
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filter_subdir=
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while case "$#" in 0) usage;; esac
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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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-*)
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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="$OPTARG"
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;;
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--tag-name-filter)
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filter_tag_name="$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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*)
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usage
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;;
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esac
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done
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dstbranch="$1"
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shift
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test -n "$dstbranch" || die "missing branch name"
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git show-ref "refs/heads/$dstbranch" 2> /dev/null &&
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die "branch $dstbranch already exists"
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test ! -e "$tempdir" || die "$tempdir already exists, please remove it"
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mkdir -p "$tempdir/t"
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cd "$tempdir/t"
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workdir="$(pwd)"
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case "$GIT_DIR" in
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/*)
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;;
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*)
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GIT_DIR="$(pwd)/../../$GIT_DIR"
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;;
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esac
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export GIT_DIR GIT_WORK_TREE=.
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export GIT_INDEX_FILE="$(pwd)/../index"
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git read-tree # seed the index file
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ret=0
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mkdir ../map # map old->new commit ids for rewriting parents
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case "$filter_subdir" in
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"")
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git rev-list --reverse --topo-order --default HEAD \
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--parents "$@"
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;;
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*)
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git rev-list --reverse --topo-order --default HEAD \
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--parents --full-history "$@" -- "$filter_subdir"
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esac > ../revs
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commits=$(cat ../revs | wc -l | tr -d " ")
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test $commits -eq 0 && die "Found nothing to rewrite"
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i=0
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while read commit parents; do
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i=$(($i+1))
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printf "\rRewrite $commit ($i/$commits)"
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case "$filter_subdir" in
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"")
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git read-tree -i -m $commit
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;;
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*)
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git read-tree -i -m $commit:"$filter_subdir"
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esac
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export GIT_COMMIT=$commit
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git cat-file commit "$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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# files that $commit removed are now still in the working tree;
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# remove them, else they would be added again
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git ls-files -z --others | xargs -0 rm -f
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eval "$filter_tree" < /dev/null ||
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die "tree filter failed: $filter_tree"
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git diff-index -r $commit | cut -f 2- | tr '\n' '\0' | \
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xargs -0 git update-index --add --replace --remove
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git ls-files -z --others | \
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xargs -0 git update-index --add --replace --remove
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fi
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eval "$filter_index" < /dev/null ||
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die "index filter failed: $filter_index"
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parentstr=
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for parent in $parents; do
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for reparent in $(map "$parent"); do
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parentstr="$parentstr -p $reparent"
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done
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done
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if [ "$filter_parent" ]; then
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parentstr="$(echo "$parentstr" | eval "$filter_parent")" ||
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die "parent filter failed: $filter_parent"
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fi
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sed -e '1,/^$/d' <../commit | \
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eval "$filter_msg" > ../message ||
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die "msg filter failed: $filter_msg"
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sh -c "$filter_commit" "git commit-tree" \
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$(git write-tree) $parentstr < ../message > ../map/$commit
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done <../revs
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src_head=$(tail -n 1 ../revs | sed -e 's/ .*//')
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target_head=$(head -n 1 ../map/$src_head)
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case "$target_head" in
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'')
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echo Nothing rewritten
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;;
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*)
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git update-ref refs/heads/"$dstbranch" $target_head
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if [ $(cat ../map/$src_head | wc -l) -gt 1 ]; then
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echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
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sed 's/^/ /' ../map/$src_head >&2
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ret=1
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fi
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;;
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esac
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if [ "$filter_tag_name" ]; then
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git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |
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while read sha1 type ref; do
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ref="${ref#refs/tags/}"
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# XXX: Rewrite tagged trees as well?
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if [ "$type" != "commit" -a "$type" != "tag" ]; then
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continue;
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fi
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if [ "$type" = "tag" ]; then
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# Dereference to a commit
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sha1t="$sha1"
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sha1="$(git rev-parse "$sha1"^{commit} 2>/dev/null)" || continue
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fi
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[ -f "../map/$sha1" ] || continue
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new_sha1="$(cat "../map/$sha1")"
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export GIT_COMMIT="$sha1"
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new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
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die "tag name filter failed: $filter_tag_name"
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echo "$ref -> $new_ref ($sha1 -> $new_sha1)"
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if [ "$type" = "tag" ]; then
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# Warn that we are not rewriting the tag object itself.
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warn "unreferencing tag object $sha1t"
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fi
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git update-ref "refs/tags/$new_ref" "$new_sha1"
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done
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fi
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cd ../..
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rm -rf "$tempdir"
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printf "\nRewritten history saved to the $dstbranch branch\n"
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exit $ret
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