$ git clone -n https://gitee.com/ocs-upgrade/gtkmm30.git /var/lib/mock/dist-ocs23-base-build-317720-33438/root/chroot_tmpdir/scmroot/gtkmm30
Cloning into '/var/lib/mock/dist-ocs23-base-build-317720-33438/root/chroot_tmpdir/scmroot/gtkmm30'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/ocs-upgrade/gtkmm30
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c213d0 Upgrade to version 4.19.0