$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-YAML-Valid.git /var/lib/mock/f45-build-26937-620/root/chroot_tmpdir/scmroot/perl-Test-YAML-Valid
Cloning into '/var/lib/mock/f45-build-26937-620/root/chroot_tmpdir/scmroot/perl-Test-YAML-Valid'...
$ git fetch origin 46dfbe01a4c0df7071d1a0aa0b8341e9dd014d56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-YAML-Valid
 * [new ref]         46dfbe01a4c0df7071d1a0aa0b8341e9dd014d56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46dfbe0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild