$ git clone -n https://src.fedoraproject.org/rpms/dummy-test-package-gloster.git /var/lib/mock/f40-build-2434572-60750/root/chroot_tmpdir/scmroot/dummy-test-package-gloster
Cloning into '/var/lib/mock/f40-build-2434572-60750/root/chroot_tmpdir/scmroot/dummy-test-package-gloster'...
$ git fetch origin 750fe3d24c48af5445e339a7a8675286c1ad2278:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dummy-test-package-gloster
 * [new ref]           750fe3d24c48af5445e339a7a8675286c1ad2278 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 750fe3d2 Bump release