Teach append_signoff how to detect a duplicate s-o-b in the commit footer.
This is in preparation to unify the append_signoff implementations in
log-tree.c and sequencer.c.

Fixes test in t3511.

Signed-off-by: Brandon Casey <bca...@nvidia.com>
---
 builtin/commit.c         |  2 +-
 sequencer.c              | 46 ++++++++++++++++++++++++++++++++++++----------
 sequencer.h              |  2 +-
 t/t3511-cherry-pick-x.sh |  2 +-
 4 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 7c2a3d4..081ff66 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -700,7 +700,7 @@ static int prepare_to_commit(const char *index_file, const 
char *prefix,
                        previous = eol;
                }
 
-               append_signoff(&sb, ignore_footer);
+               append_signoff(&sb, ignore_footer, 0);
        }
 
        if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
diff --git a/sequencer.c b/sequencer.c
index 163dc12..d4a2ece 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -46,12 +46,20 @@ static int is_cherry_picked_from_line(const char *buf, int 
len)
                 (buf[len - 1] == '\n' && buf[len - 2] == ')'));
 }
 
-static int has_conforming_footer(struct strbuf *sb, int ignore_footer)
+/*
+ * Returns 0 for non-conforming footer
+ * Returns 1 for conforming footer
+ * Returns 2 when sob exists within conforming footer
+ * Returns 3 when sob exists within conforming footer as last entry
+ */
+static int has_conforming_footer(struct strbuf *sb, struct strbuf *sob,
+       int ignore_footer)
 {
        int hit = 0;
        int i, k;
        int len = sb->len - ignore_footer;
        const char *buf = sb->buf;
+       int found_sob = 0;
 
        for (i = len - 1; i > 0; i--) {
                if (hit && buf[i] == '\n')
@@ -67,14 +75,25 @@ static int has_conforming_footer(struct strbuf *sb, int 
ignore_footer)
                i++;
 
        for (; i < len; i = k) {
+               int found_rfc2822;
+
                for (k = i; k < len && buf[k] != '\n'; k++)
                        ; /* do nothing */
                k++;
 
-               if (!(is_rfc2822_line(buf + i, k - i) ||
+               found_rfc2822 = is_rfc2822_line(buf + i, k - i);
+               if (found_rfc2822 && sob &&
+                       !strncmp(buf + i, sob->buf, sob->len))
+                       found_sob = k;
+
+               if (!(found_rfc2822 ||
                        is_cherry_picked_from_line(buf + i, k - i)))
                        return 0;
        }
+       if (found_sob == i)
+               return 3;
+       if (found_sob)
+               return 2;
        return 1;
 }
 
@@ -296,7 +315,7 @@ static int do_recursive_merge(struct commit *base, struct 
commit *next,
        rollback_lock_file(&index_lock);
 
        if (opts->signoff)
-               append_signoff(msgbuf, 0);
+               append_signoff(msgbuf, 0, 0);
 
        if (!clean) {
                int i;
@@ -555,7 +574,7 @@ static int do_pick_commit(struct commit *commit, struct 
replay_opts *opts)
                }
 
                if (opts->record_origin) {
-                       if (!has_conforming_footer(&msgbuf, 0))
+                       if (!has_conforming_footer(&msgbuf, NULL, 0))
                                strbuf_addch(&msgbuf, '\n');
                        strbuf_addstr(&msgbuf, cherry_picked_prefix);
                        strbuf_addstr(&msgbuf, 
sha1_to_hex(commit->object.sha1));
@@ -1082,9 +1101,10 @@ int sequencer_pick_revisions(struct replay_opts *opts)
        return pick_commits(todo_list, opts);
 }
 
-void append_signoff(struct strbuf *msgbuf, int ignore_footer)
+void append_signoff(struct strbuf *msgbuf, int ignore_footer, int no_dup_sob)
 {
        struct strbuf sob = STRBUF_INIT;
+       int has_footer = 0;
        int i;
 
        strbuf_addstr(&sob, sign_off_header);
@@ -1093,10 +1113,16 @@ void append_signoff(struct strbuf *msgbuf, int 
ignore_footer)
        strbuf_addch(&sob, '\n');
        for (i = msgbuf->len - 1 - ignore_footer; i > 0 && msgbuf->buf[i - 1] 
!= '\n'; i--)
                ; /* do nothing */
-       if (prefixcmp(msgbuf->buf + i, sob.buf)) {
-               if (!i || !has_conforming_footer(msgbuf, ignore_footer))
-                       strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, 
"\n", 1);
-               strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, sob.buf, 
sob.len);
-       }
+
+       if (i)
+               has_footer = has_conforming_footer(msgbuf, &sob, ignore_footer);
+
+       if (!has_footer)
+               strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, "\n", 1);
+
+       if (has_footer != 3 && (!no_dup_sob || has_footer != 2))
+               strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
+                               sob.buf, sob.len);
+
        strbuf_release(&sob);
 }
diff --git a/sequencer.h b/sequencer.h
index 9d57d57..c4c7132 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -48,6 +48,6 @@ int sequencer_pick_revisions(struct replay_opts *opts);
 
 extern const char sign_off_header[];
 
-void append_signoff(struct strbuf *msgbuf, int ignore_footer);
+void append_signoff(struct strbuf *msgbuf, int ignore_footer, int no_dup_sob);
 
 #endif
diff --git a/t/t3511-cherry-pick-x.sh b/t/t3511-cherry-pick-x.sh
index 9dd6d5d..4b67343 100755
--- a/t/t3511-cherry-pick-x.sh
+++ b/t/t3511-cherry-pick-x.sh
@@ -82,7 +82,7 @@ test_expect_success 'cherry-pick -s inserts blank line after 
one line subject' '
        test_cmp expect actual
 '
 
-test_expect_failure 'cherry-pick -s inserts blank line after non-conforming 
footer' '
+test_expect_success 'cherry-pick -s inserts blank line after non-conforming 
footer' '
        pristine_detach initial &&
        git cherry-pick -s mesg-broken-footer &&
        cat <<-EOF >expect &&
-- 
1.8.1.1.252.gdb33759

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