$ git clone -n https://src.fedoraproject.org/rpms/dummy-test-package-gloster.git /var/lib/mock/f41-build-side-1-2672131-29190/root/chroot_tmpdir/scmroot/dummy-test-package-gloster
Cloning into '/var/lib/mock/f41-build-side-1-2672131-29190/root/chroot_tmpdir/scmroot/dummy-test-package-gloster'...
$ git fetch origin 33ec21b84f1d57c52a5cef8a1bb46f25c4a965bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dummy-test-package-gloster
 * [new ref]           33ec21b84f1d57c52a5cef8a1bb46f25c4a965bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33ec21b8 Bump release