am: stop exporting GIT_COMMITTER_DATE

The implementation of --committer-date-is-author-date exports
GIT_COMMITTER_DATE to override the default committer date but does not
reset GIT_COMMITTER_DATE in the environment after creating the commit
so it is set in the environment of any hooks that get run. We're about
to add the same functionality to the sequencer and do not want to have
GIT_COMMITTER_DATE set when running hooks or exec commands so lets
update commit_tree_extended() to take an explicit committer so we
override the default date without setting GIT_COMMITTER_DATE in the
environment.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/commit.h b/commit.h
index 008a0fa4a0..8f4227ae5c 100644
--- a/commit.h
+++ b/commit.h
@@ -316,10 +316,9 @@ int commit_tree(const char *msg, size_t msg_len,
 
 int commit_tree_extended(const char *msg, size_t msg_len,
 			 const struct object_id *tree,
-			 struct commit_list *parents,
-			 struct object_id *ret, const char *author,
-			 const char *sign_commit,
-			 struct commit_extra_header *);
+			 struct commit_list *parents, struct object_id *ret,
+			 const char *author, const char *committer,
+			 const char *sign_commit, struct commit_extra_header *);
 
 struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);