Allowing for incremental updates of large trees. I have been using this as part of the device tree extraction from the Linux kernel source since 2013, about time I sent the patch upstream! Signed-off-by: Ian Campbell <ijc@xxxxxxxxxxxxxx> --- git-filter-branch.sh | 39 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) diff --git a/git-filter-branch.sh b/git-filter-branch.sh index 3a74602ef..d07db3fee 100755 --- a/git-filter-branch.sh +++ b/git-filter-branch.sh @@ -86,7 +86,7 @@ USAGE="[--setup <command>] [--env-filter <command>] [--parent-filter <command>] [--msg-filter <command>] [--commit-filter <command>] [--tag-name-filter <command>] [--subdirectory-filter <directory>] [--original <namespace>] - [-d <directory>] [-f | --force] + [-d <directory>] [-f | --force] [--state-branch <branch>] [--] [<rev-list options>...]" OPTIONS_SPEC= @@ -106,6 +106,7 @@ filter_msg=cat filter_commit= filter_tag_name= filter_subdir= +state_branch= orig_namespace=refs/original/ force= prune_empty= @@ -181,6 +182,9 @@ do --original) orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/ ;; + --state-branch) + state_branch="$OPTARG" + ;; *) usage ;; @@ -252,6 +256,20 @@ export GIT_INDEX_FILE # map old->new commit ids for rewriting parents mkdir ../map || die "Could not create map/ directory" +if [ -n "$state_branch" ] ; then + state_commit=`git show-ref -s "$state_branch"` + if [ -n "$state_commit" ] ; then + echo "Populating map from $state_branch ($state_commit)" 1>&2 + git show "$state_commit":filter.map | + perl -n -e 'm/(.*):(.*)/ or die; + open F, ">../map/$1" or die; + print F "$2" or die; + close(F) or die' + else + echo "Branch $state_branch does not exist. Will create" 1>&2 + fi +fi + # we need "--" only if there are no path arguments in $@ nonrevs=$(git rev-parse --no-revs "$@") || exit if test -z "$nonrevs" @@ -544,6 +562,25 @@ if [ "$filter_tag_name" ]; then done fi +if [ -n "$state_branch" ] ; then + echo "Saving rewrite state to $state_branch" 1>&2 + STATE_BLOB=$(ls ../map | + perl -n -e 'chomp(); + open F, "<../map/$_" or die; + chomp($f = <F>); print "$_:$f\n";' | + git hash-object -w --stdin ) + STATE_TREE=$(/bin/echo -e "100644 blob $STATE_BLOB\tfilter.map" | git mktree) + STATE_PARENT=$(git show-ref -s "$state_branch") + unset GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE + unset GIT_COMMITTER_NAME GIT_COMMITTER_EMAIL GIT_COMMITTER_DATE + if [ -n "$STATE_PARENT" ] ; then + STATE_COMMIT=$(/bin/echo "Sync" | git commit-tree "$STATE_TREE" -p "$STATE_PARENT") + else + STATE_COMMIT=$(/bin/echo "Sync" | git commit-tree "$STATE_TREE" ) + fi + git update-ref "$state_branch" "$STATE_COMMIT" +fi + cd "$orig_dir" rm -rf "$tempdir" -- 2.11.0
