$ git clone -n https://src.fedoraproject.org/rpms/xloadimage.git /var/lib/mock/f45-build-38888-730/root/chroot_tmpdir/scmroot/xloadimage
Cloning into '/var/lib/mock/f45-build-38888-730/root/chroot_tmpdir/scmroot/xloadimage'...
$ git fetch origin 3dd74dd5589f937bb92cae87460cd8a95cc16bbf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xloadimage
 * [new ref]         3dd74dd5589f937bb92cae87460cd8a95cc16bbf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3dd74dd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild