[TOY PATCH] filter-branch: add option --delete-unchanged
- From
Thomas Rast <trast@student.ethz.ch>
- Date
- Aug 8, 2008, 20:10 UTC
- Message-ID
- <1218226224-25273-1-git-send-email-trast@student.ethz.ch>
- In-Reply-To
- <1218153031-18443-1-git-send-email-trast@student.ethz.ch>
With --delete-unchanged, we nuke refs whose targets did not change during rewriting. It is intended to be used along with --subdirectory-filter to clean out old refs from before the first commit to the filtered subdirectory. (They would otherwise keep the old history alive.)
Obviously this is a rather dangerous mode of operation.
Note the "sort -u" is required: Without it, --all includes 'origin/master' twice (from 'origin/master' and via 'origin/HEAD'), and the second pass concludes it is unchanged and nukes the ref.
Signed-off-by: Thomas Rast <trast@student.ethz.ch> ---
This applies on top of "filter-branch: be more helpful when an annotated tag changes".
I'm not really sure if this should go in, but it might have solved Jan's problem.
git-filter-branch.sh | 33 +++++++++++++++++++++++---------- 1 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/git-filter-branch.sh b/git-filter-branch.sh index a140337..539b2e6 100755 --- a/git-filter-branch.sh +++ b/git-filter-branch.sh @@ -114,6 +114,7 @@ filter_tag_name= filter_subdir= orig_namespace=refs/original/ force= +delete_unchanged= while : do case "$1" in @@ -126,6 +127,11 @@ do force=t continue ;; + --delete-unchanged-refs) + shift + delete_unchanged=t + continue + ;; -*) ;; *) @@ -215,6 +221,7 @@ export GIT_DIR GIT_WORK_TREE # The refs should be updated if their heads were rewritten git rev-parse --no-flags --revs-only --symbolic-full-name --default HEAD "$@" | +sort -u | sed -e '/^^/d' >"$tempdir"/heads test -s "$tempdir"/heads || @@ -344,7 +351,7 @@ do sha1=$(git rev-parse "$ref"^0) rewritten=$(map $sha1) - test $sha1 = "$rewritten" && + test $sha1 = "$rewritten" -a -z "$delete_unchanged" && warn "WARNING: Ref '$ref' is unchanged" && continue @@ -355,16 +362,22 @@ do 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 "$filter_tag_name"; then - warn "WARNING: You said to rewrite tagged commits, but not the corresponding tag." - warn "WARNING: Perhaps use '--tag-name-filter cat' to rewrite the tag." + if test "$delete_unchanged" -a $sha1 = "$rewritten"; then + echo "Ref '$ref' was deleted because it is unchanged" + git update-ref -m "filter-branch: delete" -d "$ref" $sha1 || + die "Could not delete $ref" + else + echo "Ref '$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 - else - die "Could not rewrite $ref" fi fi ;;
-- 1.6.0.rc2.24.gf1dd.dirty