$ git clone -n https://src.fedoraproject.org/rpms/libXrandr.git /var/lib/mock/f45-build-15787-479/root/chroot_tmpdir/scmroot/libXrandr
Cloning into '/var/lib/mock/f45-build-15787-479/root/chroot_tmpdir/scmroot/libXrandr'...
$ git fetch origin d790f9c8587f60a03ee4b47088220d8f92d810e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXrandr
 * [new ref]         d790f9c8587f60a03ee4b47088220d8f92d810e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d790f9c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild