$ git clone -n https://src.fedoraproject.org/rpms/dummy-test-package-gloster.git /var/lib/mock/f41-build-1018507-17947/root/chroot_tmpdir/scmroot/dummy-test-package-gloster
Cloning into '/var/lib/mock/f41-build-1018507-17947/root/chroot_tmpdir/scmroot/dummy-test-package-gloster'...
$ git fetch origin 37137b7a56083088c7848b0b955f43ae8678d2b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dummy-test-package-gloster
 * [new ref]           37137b7a56083088c7848b0b955f43ae8678d2b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37137b7a Bump release