X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=git-filter-branch.sh;h=01900602e1f64483d2999f48aecea530f7afbc0b;hb=8a1d076e21810f5bc7e9ef10d84f7ca9637b89af;hp=0d000ed306caad7be70856c070a362f09439e48d;hpb=af580e9c5afcffe7020e6f955f5136ee4220834f;p=git.git diff --git a/git-filter-branch.sh b/git-filter-branch.sh index 0d000ed30..01900602e 100755 --- a/git-filter-branch.sh +++ b/git-filter-branch.sh @@ -8,7 +8,7 @@ # a new branch. You can specify a number of filters to modify the commits, # files and trees. -USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] DESTBRANCH [REV-RANGE]" +USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] [REV-RANGE]" . git-sh-setup warn () { @@ -78,6 +78,8 @@ filter_msg=cat filter_commit='git commit-tree "$@"' filter_tag_name= filter_subdir= +orig_namespace=refs/original/ +force= while case "$#" in 0) usage;; esac do case "$1" in @@ -85,6 +87,11 @@ do shift break ;; + --force|-f) + shift + force=t + continue + ;; -*) ;; *) @@ -126,33 +133,68 @@ do --subdirectory-filter) filter_subdir="$OPTARG" ;; + --original) + orig_namespace="$OPTARG" + ;; *) usage ;; esac done -dstbranch="$1" -shift -test -n "$dstbranch" || die "missing branch name" -git show-ref "refs/heads/$dstbranch" 2> /dev/null && - die "branch $dstbranch already exists" - -test ! -e "$tempdir" || die "$tempdir already exists, please remove it" +case "$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 "" -case "$GIT_DIR" in -/*) +# Make sure refs/original is empty +git for-each-ref > "$tempdir"/backup-refs +while read sha1 type name +do + case "$force,$name" in + ,$orig_namespace*) + die "Namespace $orig_namespace not empty" ;; -*) - GIT_DIR="$(pwd)/../../$GIT_DIR" + t,$orig_namespace*) + git update-ref -d "$name" $sha1 ;; -esac + esac +done < "$tempdir"/backup-refs + export GIT_DIR GIT_WORK_TREE=. +# These refs should be updated if their heads were rewritten + +git rev-parse --revs-only --symbolic "$@" | +while read ref +do + # normalize ref + case "$ref" in + HEAD) + ref="$(git symbolic-ref "$ref")" + ;; + refs/*) + ;; + *) + ref="$(git for-each-ref --format='%(refname)' | + grep /"$ref")" + esac + + git check-ref-format "$ref" && echo "$ref" +done > "$tempdir"/heads + +test -s "$tempdir"/heads || + die "Which ref do you want to rewrite?" + export GIT_INDEX_FILE="$(pwd)/../index" git read-tree || die "Could not seed the index" @@ -174,6 +216,8 @@ commits=$(wc -l <../revs | tr -d " ") test $commits -eq 0 && die "Found nothing to rewrite" +# Rewrite the commits + i=0 while read commit parents; do i=$(($i+1)) @@ -234,22 +278,75 @@ while read commit parents; do $(git write-tree) $parentstr < ../message > ../map/$commit done <../revs -src_head=$(tail -n 1 ../revs | sed -e 's/ .*//') -target_head=$(head -n 1 ../map/$src_head) -case "$target_head" in -'') - echo Nothing rewritten +# 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 next rewritten +# ancestor(s), i.e. the boundaries in the set of rewritten commits. + +# NEEDSWORK: we should sort the unmapped refs topologically first +while read ref +do + sha1=$(git rev-parse "$ref"^0) + test -f "$workdir"/../map/$sha1 && continue + # Assign the boundarie(s) in the set of rewritten commits + # as the replacement commit(s). + # (This would look a bit nicer if --not --stdin worked.) + for p in $( (cd "$workdir"/../map; ls | sed "s/^/^/") | + git rev-list $ref --boundary --stdin | + sed -n "s/^-//p") + do + map $p >> "$workdir"/../map/$sha1 + done +done < "$tempdir"/heads + +# 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" +count=0 +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 $ref" ;; -*) - git update-ref refs/heads/"$dstbranch" $target_head || - die "Could not update $dstbranch with $target_head" - if [ $(wc -l <../map/$src_head) -gt 1 ]; then - 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 $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2 - sed 's/^/ /' ../map/$src_head >&2 - ret=1 - fi + $_x40) + echo "Ref '$ref' was rewritten" + git update-ref -m "filter-branch: rewrite" \ + "$ref" $rewritten $sha1 || + die "Could not rewrite $ref" ;; -esac + *) + # NEEDSWORK: possibly add -Werror, making this an error + warn "WARNING: '$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" $sha1 + count=$(($count+1)) +done < "$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 [ "$filter_tag_name" ]; then git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags | @@ -286,6 +383,8 @@ fi cd ../.. rm -rf "$tempdir" -printf "\nRewritten history saved to the $dstbranch branch\n" +echo +test $count -gt 0 && echo "These refs were rewritten:" +git show-ref | grep ^"$orig_namespace" exit $ret