From: Phillip Wood <phillip.w...@dunelm.org.uk>

If there was no 'Signed-off-by:' trailer but another trailer such as
'Reported-by:' then 'git am --signoff' would add a blank line between
the existing trailers and the added 'Signed-off-by:' line. e.g.

    Rebase accepts '--rerere-autoupdate' as an option but only honors
    it if '-m' is also given. Fix it for a non-interactive rebase by
    passing on the option to 'git am' and 'git cherry-pick'.

    Reported-by: Junio C Hamano <gits...@pobox.com>

    Signed-off-by: Phillip Wood <phillip.w...@dunelm.org.uk>

Fix by using the code provided for this purpose in sequencer.c.
Change the tests so that they check the formatting of the
'Signed-off-by:' lines rather than just grepping for them.

Signed-off-by: Phillip Wood <phillip.w...@dunelm.org.uk>
---
I've removed the call to ignore_non_trailer(), otherwise this is
unchanged from v1

 builtin/am.c  | 26 +------------------
 t/t4150-am.sh | 83 +++++++++++++++++++++++++++++++++++++++++++++--------------
 2 files changed, 64 insertions(+), 45 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 
c973bd96dcb5d630d56e935733bfa4530ccd2872..3aaef59676452fd2e7c6d4a375dc7c95558744c6
 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1181,34 +1181,10 @@ static void NORETURN die_user_resolve(const struct 
am_state *state)
  */
 static void am_append_signoff(struct am_state *state)
 {
-       char *cp;
-       struct strbuf mine = STRBUF_INIT;
        struct strbuf sb = STRBUF_INIT;
 
        strbuf_attach(&sb, state->msg, state->msg_len, state->msg_len);
-
-       /* our sign-off */
-       strbuf_addf(&mine, "\n%s%s\n",
-                   sign_off_header,
-                   fmt_name(getenv("GIT_COMMITTER_NAME"),
-                            getenv("GIT_COMMITTER_EMAIL")));
-
-       /* Does sb end with it already? */
-       if (mine.len < sb.len &&
-           !strcmp(mine.buf, sb.buf + sb.len - mine.len))
-               goto exit; /* no need to duplicate */
-
-       /* Does it have any Signed-off-by: in the text */
-       for (cp = sb.buf;
-            cp && *cp && (cp = strstr(cp, sign_off_header)) != NULL;
-            cp = strchr(cp, '\n')) {
-               if (sb.buf == cp || cp[-1] == '\n')
-                       break;
-       }
-
-       strbuf_addstr(&sb, mine.buf + !!cp);
-exit:
-       strbuf_release(&mine);
+       append_signoff(&sb, 0, 0);
        state->msg = strbuf_detach(&sb, &state->msg_len);
 }
 
diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 
44807e218d7016f58bd41b89af71104a37f31a8b..73b67b4280b99e0328e201e6b69c3d88b766ea84
 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -40,6 +40,8 @@ test_expect_success 'setup: messages' '
        dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio
        dignissim qui blandit praesent luptatum zzril delenit augue duis dolore 
te
        feugait nulla facilisi.
+
+       Reported-by: A N Other <a.n.ot...@example.com>
        EOF
 
        cat >failmail <<-\EOF &&
@@ -93,7 +95,7 @@ test_expect_success setup '
        echo world >>file &&
        git add file &&
        test_tick &&
-       git commit -s -F msg &&
+       git commit -F msg &&
        git tag second &&
 
        git format-patch --stdout first >patch1 &&
@@ -124,8 +126,6 @@ test_expect_success setup '
                echo "Date: $GIT_AUTHOR_DATE" &&
                echo &&
                sed -e "1,2d" msg &&
-               echo &&
-               echo "Signed-off-by: $GIT_COMMITTER_NAME 
<$GIT_COMMITTER_EMAIL>" &&
                echo "---" &&
                git diff-tree --no-commit-id --stat -p second
        } >patch1-stgit.eml &&
@@ -144,8 +144,6 @@ test_expect_success setup '
                echo "# Parent  $_z40" &&
                cat msg &&
                echo &&
-               echo "Signed-off-by: $GIT_COMMITTER_NAME 
<$GIT_COMMITTER_EMAIL>" &&
-               echo &&
                git diff-tree --no-commit-id -p second
        } >patch1-hg.eml &&
 
@@ -470,13 +468,15 @@ test_expect_success 'am --signoff adds Signed-off-by: 
line' '
        git reset --hard &&
        git checkout -b master2 first &&
        git am --signoff <patch2 &&
-       printf "%s\n" "$signoff" >expected &&
-       echo "Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>" 
>>expected &&
-       git cat-file commit HEAD^ | grep "Signed-off-by:" >actual &&
-       test_cmp expected actual &&
-       echo "Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>" 
>expected &&
-       git cat-file commit HEAD | grep "Signed-off-by:" >actual &&
-       test_cmp expected actual
+       {
+               printf "third\n\nSigned-off-by: %s <%s>\n\n" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL" &&
+               cat msg &&
+               printf "Signed-off-by: %s <%s>\n\n" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL"
+       } >expected-log &&
+       git log --pretty=%B -2 HEAD >actual &&
+       test_cmp expected-log actual
 '
 
 test_expect_success 'am stays in branch' '
@@ -486,17 +486,60 @@ test_expect_success 'am stays in branch' '
 '
 
 test_expect_success 'am --signoff does not add Signed-off-by: line if already 
there' '
-       git format-patch --stdout HEAD^ >patch3 &&
-       sed -e "/^Subject/ s,\[PATCH,Re: Re: Re: & 1/5 v2] [foo," patch3 
>patch4 &&
-       rm -fr .git/rebase-apply &&
-       git reset --hard &&
-       git checkout HEAD^ &&
-       git am --signoff patch4 &&
-       git cat-file commit HEAD >actual &&
-       test $(grep -c "^Signed-off-by:" actual) -eq 1
+       git format-patch --stdout first >patch3 &&
+       git reset --hard first &&
+       git am --signoff <patch3 &&
+       git log --pretty=%B -2 HEAD >actual &&
+       test_cmp expected-log actual
+'
+
+test_expect_success 'am --signoff adds Signed-off-by: if another author is 
preset' '
+       NAME="A N Other" &&
+       EMAIL="a.n.ot...@example.com" &&
+       {
+               printf "third\n\nSigned-off-by: %s <%s>\nSigned-off-by: %s 
<%s>\n\n" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL" \
+                       "$NAME" "$EMAIL" &&
+               cat msg &&
+               printf "Signed-off-by: %s <%s>\nSigned-off-by: %s <%s>\n\n" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL" \
+                       "$NAME" "$EMAIL"
+       } >expected-log &&
+       git reset --hard first &&
+       GIT_COMMITTER_NAME="$NAME" GIT_COMMITTER_EMAIL="$EMAIL" \
+               git am --signoff <patch3 &&
+       git log --pretty=%B -2 HEAD >actual &&
+       test_cmp expected-log actual
+'
+
+test_expect_success 'am --signoff duplicates Signed-off-by: if it is not the 
last one' '
+       NAME="A N Other" &&
+       EMAIL="a.n.ot...@example.com" &&
+       {
+               printf "third\n\nSigned-off-by: %s <%s>\n\
+Signed-off-by: %s <%s>\nSigned-off-by: %s <%s>\n\n" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL" \
+                       "$NAME" "$EMAIL" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL" &&
+               cat msg &&
+               printf "Signed-off-by: %s <%s>\nSigned-off-by: %s <%s>\n\
+Signed-off-by: %s <%s>\n\n" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL" \
+                       "$NAME" "$EMAIL" \
+                       "$GIT_COMMITTER_NAME" "$GIT_COMMITTER_EMAIL"
+       } >expected-log &&
+       git format-patch --stdout first >patch3 &&
+       git reset --hard first &&
+       git am --signoff <patch3 &&
+       git log --pretty=%B -2 HEAD >actual &&
+       test_cmp expected-log actual
 '
 
 test_expect_success 'am without --keep removes Re: and [PATCH] stuff' '
+       git format-patch --stdout HEAD^ >tmp &&
+       sed -e "/^Subject/ s,\[PATCH,Re: Re: Re: & 1/5 v2] [foo," tmp >patch4 &&
+       git reset --hard HEAD^ &&
+       git am <patch4 &&
        git rev-parse HEAD >expected &&
        git rev-parse master2 >actual &&
        test_cmp expected actual
-- 
2.13.3

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