On Thu, Nov 05, 2015 at 07:18:32PM -0500, Jeff King wrote:
> Of course that leaves only the problem that filter-branch is
> horrendously slow (for the kernel, most of the time goes to populating
> the index for each commit; I think filter-branch could probably learn to
> skip this step if there is no index or tree filter at work).
Here's a totally untested patch that seems to make a filter-branch like
this on the kernel orders of magnitude faster:
diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 27c9c54..9df5185 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -306,6 +306,13 @@ then
start_timestamp=$(date '+%s')
fi
+if test -n "$filter_index" || test -n "$filter_tree"
+then
+ need_index=t
+else
+ need_index=
+fi
+
while read commit parents; do
git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1))
@@ -313,7 +320,10 @@ while read commit parents; do
case "$filter_subdir" in
"")
- GIT_ALLOW_NULL_SHA1=1 git read-tree -i -m $commit
+ if test -n "$need_index"
+ then
+ GIT_ALLOW_NULL_SHA1=1 git read-tree -i -m $commit
+ fi
;;
*)
# The commit may not have the subdirectory at all
@@ -387,8 +397,15 @@ while read commit parents; do
} <../commit |
eval "$filter_msg" > ../message ||
die "msg filter failed: $filter_msg"
+
+ if test -n "$need_index"
+ then
+ tree=$(git write-tree)
+ else
+ tree="$commit^{tree}"
+ fi
workdir=$workdir @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
- $(git write-tree) $parentstr < ../message > ../map/$commit ||
+ "$tree" $parentstr < ../message > ../map/$commit ||
die "could not write rewritten commit"
done <../revs
--
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