# 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
}
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
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 "$1" | tr "a-z" "A-Z")"
+ lid="$(echo "$1" | tr "[A-Z]" "[a-z]")"
+ uid="$(echo "$1" | tr "[a-z]" "[A-Z]")"
pick_id_script='
/^'$lid' /{
s/'\''/'\''\\'\'\''/g
h
s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
s/'\''/'\''\'\'\''/g
- s/.*/export GIT_'$uid'_NAME='\''&'\''/p
+ s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p
g
s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
s/'\''/'\''\'\'\''/g
- s/.*/export GIT_'$uid'_EMAIL='\''&'\''/p
+ s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p
g
s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
s/'\''/'\''\'\'\''/g
- s/.*/export GIT_'$uid'_DATE='\''&'\''/p
+ s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p
q
}
LANG=C LC_ALL=C sed -ne "$pick_id_script"
# Ensure non-empty id name.
- echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
+ echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
}
-# This script can be sourced by the commit filter to get the functions
-test "a$SOURCE_FUNCTIONS" = a1 && return
-this_script="$(cd "$(dirname "$0")"; pwd)"/$(basename "$0")
-export this_script
-
USAGE="[--env-filter <command>] [--tree-filter <command>] \
[--index-filter <command>] [--parent-filter <command>] \
[--msg-filter <command>] [--commit-filter <command>] \
OPTIONS_SPEC=
. git-sh-setup
-git diff-files --quiet &&
- git diff-index --cached --quiet HEAD ||
+if [ "$(is_bare_repository)" = false ]; then
+ git diff-files --quiet &&
+ git diff-index --cached --quiet HEAD -- ||
die "Cannot rewrite branch(es) with a dirty working directory."
+fi
tempdir=.git-rewrite
filter_env=
filter_index=
filter_parent=
filter_msg=cat
-filter_commit='git commit-tree "$@"'
+filter_commit=
filter_tag_name=
filter_subdir=
orig_namespace=refs/original/
force=
+prune_empty=
while :
do
- test $# = 0 && usage
case "$1" in
--)
shift
force=t
continue
;;
+ --prune-empty)
+ shift
+ prune_empty=t
+ continue
+ ;;
-*)
;;
*)
filter_msg="$OPTARG"
;;
--commit-filter)
- filter_commit='SOURCE_FUNCTIONS=1 . "$this_script";'" $OPTARG"
+ filter_commit="$functions; $OPTARG"
;;
--tag-name-filter)
filter_tag_name="$OPTARG"
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 "$tempdir"
workdir="$(pwd)" ||
die ""
+# Remove tempdir on exit
+trap 'cd ../..; rm -rf "$tempdir"' 0
+
# Make sure refs/original is empty
git for-each-ref > "$tempdir"/backup-refs
while read sha1 type name
ORIG_GIT_DIR="$GIT_DIR"
ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
-export GIT_DIR GIT_WORK_TREE=.
+GIT_WORK_TREE=.
+export GIT_DIR GIT_WORK_TREE
-# These refs should be updated if their heads were rewritten
-
-git rev-parse --revs-only --symbolic "$@" |
-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
+# The refs should be updated if their heads were rewritten
+git rev-parse --no-flags --revs-only --symbolic-full-name --default HEAD "$@" |
+sed -e '/^^/d' >"$tempdir"/heads
test -s "$tempdir"/heads ||
die "Which ref do you want to rewrite?"
-export GIT_INDEX_FILE="$(pwd)/../index"
+GIT_INDEX_FILE="$(pwd)/../index"
+export GIT_INDEX_FILE
git read-tree || die "Could not seed the index"
ret=0
case "$filter_subdir" in
"")
git rev-list --reverse --topo-order --default HEAD \
- --parents "$@"
+ --parents --simplify-merges "$@"
;;
*)
git rev-list --reverse --topo-order --default HEAD \
- --parents --full-history "$@" -- "$filter_subdir"
+ --parents --simplify-merges "$@" -- "$filter_subdir"
esac > ../revs || die "Could not get the commits"
commits=$(wc -l <../revs | tr -d " ")
git read-tree -i -m $commit
;;
*)
- git read-tree -i -m $commit:"$filter_subdir"
+ # 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"
- export GIT_COMMIT=$commit
+ GIT_COMMIT=$commit
+ export GIT_COMMIT
git cat-file commit "$commit" >../commit ||
die "Cannot read commit $commit"
die "Could not checkout the index"
# files that $commit removed are now still in the working tree;
# remove them, else they would be added again
- git ls-files -z --others | xargs -0 rm -f
+ git clean -d -q -f -x
eval "$filter_tree" < /dev/null ||
die "tree filter failed: $filter_tree"
- git diff-index -r $commit | cut -f 2- | tr '\n' '\0' | \
- xargs -0 git update-index --add --replace --remove
- git ls-files -z --others | \
- xargs -0 git update-index --add --replace --remove
+ (
+ git diff-index -r --name-only $commit
+ git ls-files --others
+ ) |
+ git update-index --add --replace --remove --stdin
fi
eval "$filter_index" < /dev/null ||
sed -e '1,/^$/d' <../commit | \
eval "$filter_msg" > ../message ||
die "msg filter failed: $filter_msg"
- sh -c "$filter_commit" "git commit-tree" \
+ @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
$(git write-tree) $parentstr < ../message > ../map/$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 next rewritten
-# ancestor(s), i.e. the boundaries in the set of rewritten commits.
+# revision walker. Fix it by mapping these heads to the unique nearest
+# ancestor that survived the pruning.
-# 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 $ref --boundary --stdin |
- sed -n "s/^-//p")
+if test "$filter_subdir"
+then
+ while read ref
do
- map $p >> "$workdir"/../map/$sha1
- done
-done < "$tempdir"/heads
+ 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"
-count=0
echo
while read ref
do
;;
$_x40)
echo "Ref '$ref' was rewritten"
- git update-ref -m "filter-branch: rewrite" \
- "$ref" $rewritten $sha1 ||
- die "Could not rewrite $ref"
+ if ! git update-ref -m "filter-branch: rewrite" \
+ "$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 $ref"
+ fi
+ fi
;;
*)
# NEEDSWORK: possibly add -Werror, making this an error
;;
esac
git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1
- count=$(($count+1))
done < "$tempdir"/heads
# TODO: This should possibly go, with the semantics that all positive given
[ -f "../map/$sha1" ] || continue
new_sha1="$(cat "../map/$sha1")"
- export GIT_COMMIT="$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
- # Warn that we are not rewriting the tag object itself.
- warn "unreferencing tag object $sha1t"
+ new_sha1=$( ( 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" "$new_sha1" ||
cd ../..
rm -rf "$tempdir"
-echo
-test $count -gt 0 && echo "These refs were rewritten:"
-git show-ref | grep ^"$orig_namespace"
-
-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
-git read-tree -u -m HEAD
+
+trap - 0
+
+if [ "$(is_bare_repository)" = false ]; then
+ unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
+ test -z "$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
+ }
+ git read-tree -u -m HEAD
+fi
exit $ret