Since 664059fb62 (Felipe Contreras, Apr 17 2013, transport-helper: update
remote helper namespace), a 'push' operation on a remote helper updates
the private ref by default. This is often a good thing, but it can also
be desirable to disable this update to force the next 'pull' to re-import
the pushed revisions.

Allow remote-helpers to disable the automatic update by introducing a new
capability.

Signed-off-by: Matthieu Moy <matthieu....@imag.fr>
---
> There's an extra unnecessary space here, no?

Indeed (the new option is shorter, and I didn't rewrap). It doesn't
really matter, but in case, here's an updated version.

 Documentation/gitremote-helpers.txt |  5 +++++
 git-remote-testgit.sh               |  1 +
 t/t5801-remote-helpers.sh           | 11 +++++++++++
 transport-helper.c                  |  7 +++++--
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Documentation/gitremote-helpers.txt 
b/Documentation/gitremote-helpers.txt
index 0827f69..ee9e134 100644
--- a/Documentation/gitremote-helpers.txt
+++ b/Documentation/gitremote-helpers.txt
@@ -120,6 +120,11 @@ connecting (see the 'connect' command under COMMANDS).
 When choosing between 'push' and 'export', Git prefers 'push'.
 Other frontends may have some other order of preference.
 
+'no-private-update'::
+       When using the 'refspec' capability, git normally updates the
+       private ref on successful push. This update is disabled when
+       the remote-helper declares the capability 'no-private-update'.
+
 
 Capabilities for Fetching
 ^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/git-remote-testgit.sh b/git-remote-testgit.sh
index 2109070..6d2f282 100755
--- a/git-remote-testgit.sh
+++ b/git-remote-testgit.sh
@@ -38,6 +38,7 @@ do
                        echo "*export-marks $gitmarks"
                fi
                test -n "$GIT_REMOTE_TESTGIT_SIGNED_TAGS" && echo "signed-tags"
+               test -n "$GIT_REMOTE_TESTGIT_NO_PRIVATE_UPDATE" && echo 
"no-private-update"
                echo
                ;;
        list)
diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index 8c4c539..613f69a 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -182,6 +182,17 @@ test_expect_success 'push update refs' '
        )
 '
 
+test_expect_success 'push update refs disabled by no-private-update' '
+       (cd local &&
+       echo more-update >>file &&
+       git commit -a -m more-update &&
+       git rev-parse --verify testgit/origin/heads/update >expect &&
+       GIT_REMOTE_TESTGIT_NO_PRIVATE_UPDATE=t git push origin update &&
+       git rev-parse --verify testgit/origin/heads/update >actual &&
+       test_cmp expect actual
+       )
+'
+
 test_expect_success 'push update refs failure' '
        (cd local &&
        git checkout update &&
diff --git a/transport-helper.c b/transport-helper.c
index 63cabc3..3328394 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -27,7 +27,8 @@ struct helper_data {
                push : 1,
                connect : 1,
                signed_tags : 1,
-               no_disconnect_req : 1;
+               no_disconnect_req : 1,
+               no_private_update : 1;
        char *export_marks;
        char *import_marks;
        /* These go from remote name (as in "list") to private name */
@@ -205,6 +206,8 @@ static struct child_process *get_helper(struct transport 
*transport)
                        strbuf_addstr(&arg, "--import-marks=");
                        strbuf_addstr(&arg, capname + strlen("import-marks "));
                        data->import_marks = strbuf_detach(&arg, NULL);
+               } else if (!prefixcmp(capname, "no-private-update")) {
+                       data->no_private_update = 1;
                } else if (mandatory) {
                        die("Unknown mandatory capability %s. This remote "
                            "helper probably needs newer version of Git.",
@@ -723,7 +726,7 @@ static void push_update_refs_status(struct helper_data 
*data,
                if (push_update_ref_status(&buf, &ref, remote_refs))
                        continue;
 
-               if (!data->refspecs)
+               if (!data->refspecs || data->no_private_update)
                        continue;
 
                /* propagate back the update to the remote namespace */
-- 
1.8.4.12.g98a4f55.dirty

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