commit --amend -S: strip existing gpgsig headers

Any existing commit signature was made against the contents of the old
commit, including its committer date that is about to change, and will
become invalid by amending it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/commit.h b/commit.h
index 61076486df..123aea3a7c 100644
--- a/commit.h
+++ b/commit.h
@@ -200,8 +200,8 @@ extern int commit_tree_extended(const char *msg, unsigned char *tree,
 				const char *author, const char *sign_commit,
 				struct commit_extra_header *);
 
-extern struct commit_extra_header *read_commit_extra_headers(struct commit *);
-extern struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len);
+extern struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
+extern struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **);
 
 extern void free_commit_extra_headers(struct commit_extra_header *extra);