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[PATCHv3] rebase: pass --[no-]signoff option to git am

This makes it easy to sign off a whole patchset before submission.

To make things work, we also fix a design issue in git-am that made it
ignore the signoff option during rebase (specifically, signoff was
handled in parse_mail(), but not in parse_mail_rebasing()).

This is trivially fixed by moving the conditional addition of the
signoff from parse_mail() to the caller (am_run()), after either of the
parse_mail*() functions were called.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@xxxxxxxxx>
 Documentation/git-rebase.txt | 5 +++++
 builtin/am.c                 | 6 +++---
 git-rebase.sh                | 3 ++-
 3 files changed, 10 insertions(+), 4 deletions(-)

As suggested by Ævar, it's [no-]signoff, not [no]-signoff.

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index 67d48e6883..e6f0b93337 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -385,6 +385,11 @@ have the long commit hash prepended to the format.
 	Recreate merge commits instead of flattening the history by replaying
 	commits a merge commit introduces. Merge conflict resolutions or manual
 	amendments to merge commits are not preserved.
+	This flag is passed to 'git am' to sign off all the rebased
+	commits (see linkgit:git-am[1]).
 This uses the `--interactive` machinery internally, but combining it
 with the `--interactive` option explicitly is generally not a good
diff --git a/builtin/am.c b/builtin/am.c
index f7a7a971fb..d072027b5a 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1321,9 +1321,6 @@ static int parse_mail(struct am_state *state, const char *mail)
 	strbuf_addbuf(&msg, &mi.log_message);
 	strbuf_stripspace(&msg, 0);
-	if (state->signoff)
-		am_signoff(&msg);
 	state->author_name = strbuf_detach(&author_name, NULL);
@@ -1848,6 +1845,9 @@ static void am_run(struct am_state *state, int resume)
 			if (skip)
 				goto next; /* mail should be skipped */
+			if (state->signoff)
+				am_append_signoff(state);
diff --git a/git-rebase.sh b/git-rebase.sh
index 48d7c5ded4..cce72d8494 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -34,6 +34,7 @@ root!              rebase all reachable commits up to the root(s)
 autosquash         move commits that begin with squash!/fixup! under -i
 committer-date-is-author-date! passed to 'git am'
 ignore-date!       passed to 'git am'
+[no-]signoff!      passed to 'git am'
 whitespace=!       passed to 'git apply'
 ignore-whitespace! passed to 'git apply'
 C=!                passed to 'git apply'
@@ -321,7 +322,7 @@ do
 		git_am_opt="$git_am_opt $1"
-	--committer-date-is-author-date|--ignore-date)
+	--committer-date-is-author-date|--ignore-date|--signoff|--no-signoff)
 		git_am_opt="$git_am_opt $1"