This allows a remote helper using the 'export' protocol to specify that
it supports signed tags, changing the handing from 'warn-strip' to
'verbatim'.

Signed-off-by: John Keeping <j...@keeping.me.uk>
---
 Documentation/gitremote-helpers.txt |  4 ++++
 git-remote-testgit                  |  1 +
 t/t5801-remote-helpers.sh           | 12 +++++++++++-
 transport-helper.c                  |  6 +++++-
 4 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/Documentation/gitremote-helpers.txt 
b/Documentation/gitremote-helpers.txt
index f506031..da74641 100644
--- a/Documentation/gitremote-helpers.txt
+++ b/Documentation/gitremote-helpers.txt
@@ -202,6 +202,10 @@ capability then it should advertise `refspec *:*`.
        marks specified in <file> before processing any input. For details,
        read up on '--import-marks=<file>' in linkgit:git-fast-export[1].
 
+'signed-tags'::
+       This modifies the 'export' capability, instructing Git to pass
+       '--signed-tags=verbatim' to linkgit:git-fast-export[1].  In the
+       absence of this capability, Git will use '--signed-tags=warn-strip'.
 
 
 
diff --git a/git-remote-testgit b/git-remote-testgit
index b395c8d..e7ed3a3 100755
--- a/git-remote-testgit
+++ b/git-remote-testgit
@@ -38,6 +38,7 @@ do
                        echo "*import-marks $gitmarks"
                        echo "*export-marks $gitmarks"
                fi
+               test -n "$GIT_REMOTE_TESTGIT_SIGNED_TAGS" && echo "signed-tags"
                echo
                ;;
        list)
diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index 9b287db..69212cd 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -173,7 +173,17 @@ test_expect_success GPG 'push signed tag' '
        git tag -s -m signed-tag signed-tag &&
        git push origin signed-tag
        ) &&
-       compare_refs local signed-tag^{} server signed-tag^{}
+       compare_refs local signed-tag^{} server signed-tag^{} &&
+       test_must_fail compare_refs local signed-tag server signed-tag
+'
+
+test_expect_success GPG 'push signed tag with signed-tags capability' '
+       (cd local &&
+       git checkout master &&
+       git tag -s -m signed-tag signed-tag-2 &&
+       GIT_REMOTE_TESTGIT_SIGNED_TAGS=1 git push origin signed-tag-2
+       ) &&
+       compare_refs local signed-tag-2 server signed-tag-2
 '
 
 test_done
diff --git a/transport-helper.c b/transport-helper.c
index 3ce8259..5f8d075 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -25,6 +25,7 @@ struct helper_data {
                option : 1,
                push : 1,
                connect : 1,
+               signed_tags : 1,
                no_disconnect_req : 1;
        char *export_marks;
        char *import_marks;
@@ -191,6 +192,8 @@ static struct child_process *get_helper(struct transport 
*transport)
                        refspecs[refspec_nr++] = xstrdup(capname + 
strlen("refspec "));
                } else if (!strcmp(capname, "connect")) {
                        data->connect = 1;
+               } else if (!strcmp(capname, "signed-tags")) {
+                       data->signed_tags = 1;
                } else if (!prefixcmp(capname, "export-marks ")) {
                        struct strbuf arg = STRBUF_INIT;
                        strbuf_addstr(&arg, "--export-marks=");
@@ -413,7 +416,8 @@ static int get_exporter(struct transport *transport,
        fastexport->argv = xcalloc(6 + revlist_args->nr, 
sizeof(*fastexport->argv));
        fastexport->argv[argc++] = "fast-export";
        fastexport->argv[argc++] = "--use-done-feature";
-       fastexport->argv[argc++] = "--signed-tags=warn-strip";
+       fastexport->argv[argc++] = data->signed_tags ?
+               "--signed-tags=verbatim" : "--signed-tags=warn-strip";
        if (data->export_marks)
                fastexport->argv[argc++] = data->export_marks;
        if (data->import_marks)
-- 
1.8.2.694.ga76e9c3.dirty

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