From f2f3a6b802e3dae09a1c414cd8516ff2a546a527 Mon Sep 17 00:00:00 2001 From: Thomas Rast Date: Tue, 10 Nov 2009 22:04:51 +0100 Subject: filter-branch: nearest-ancestor rewriting outside subdir filter Since a0e4639 (filter-branch: fix ref rewriting with --subdirectory-filter, 2008-08-12) git-filter-branch has done nearest-ancestor rewriting when using a --subdirectory-filter. However, that rewriting strategy is also a useful building block in other tasks. For example, if you want to split out a subset of files from your history, you would typically call git filter-branch -- -- But this fails for all refs that do not point directly to a commit that affects , because their referenced commit will not be rewritten and the ref remains untouched. The code was already there for the --subdirectory-filter case, so just introduce an option that enables it independently. Signed-off-by: Thomas Rast Signed-off-by: Johannes Sixt Signed-off-by: Junio C Hamano --- git-filter-branch.sh | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'git-filter-branch.sh') diff --git a/git-filter-branch.sh b/git-filter-branch.sh index ed3db7d6e5..6b8b6a4f26 100755 --- a/git-filter-branch.sh +++ b/git-filter-branch.sh @@ -125,6 +125,7 @@ filter_subdir= orig_namespace=refs/original/ force= prune_empty= +remap_to_ancestor= while : do case "$1" in @@ -137,6 +138,11 @@ do force=t continue ;; + --remap-to-ancestor) + shift + remap_to_ancestor=t + continue + ;; --prune-empty) shift prune_empty=t @@ -182,6 +188,7 @@ do ;; --subdirectory-filter) filter_subdir="$OPTARG" + remap_to_ancestor=t ;; --original) orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/ @@ -354,12 +361,13 @@ while read commit parents; do die "could not write rewritten commit" done <../revs -# In case of a subdirectory filter, it is possible that a specified head -# is not in the set of rewritten commits, because it was pruned by the -# revision walker. Fix it by mapping these heads to the unique nearest -# ancestor that survived the pruning. +# If we are filtering for paths, as in the case of a subdirectory +# filter, it is possible that a specified head is not in the set of +# rewritten commits, because it was pruned by the revision walker. +# Ancestor remapping fixes this by mapping these heads to the unique +# nearest ancestor that survived the pruning. -if test "$filter_subdir" +if test "$remap_to_ancestor" = t then while read ref do -- cgit v1.2.1