$ git clone -n https://src.fedoraproject.org/rpms/tinyexr.git /var/lib/mock/f45-build-37146-711/root/chroot_tmpdir/scmroot/tinyexr
Cloning into '/var/lib/mock/f45-build-37146-711/root/chroot_tmpdir/scmroot/tinyexr'...
$ git fetch origin ac06846a1b19445aed078889361efef7cba0d5a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tinyexr
 * [new ref]         ac06846a1b19445aed078889361efef7cba0d5a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac06846 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild