$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-doc.git /var/lib/mock/f45-build-13110-446/root/chroot_tmpdir/scmroot/gstreamer1-doc
Cloning into '/var/lib/mock/f45-build-13110-446/root/chroot_tmpdir/scmroot/gstreamer1-doc'...
$ git fetch origin 0299d5f6919e6d796e336fdb500c4ea09a610650:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-doc
 * [new ref]         0299d5f6919e6d796e336fdb500c4ea09a610650 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0299d5f 1.28.6