$ git clone -n https://src.fedoraproject.org/rpms/perl-Hash-Flatten.git /var/lib/mock/f40-build-2017765-46344/root/chroot_tmpdir/scmroot/perl-Hash-Flatten
Cloning into '/var/lib/mock/f40-build-2017765-46344/root/chroot_tmpdir/scmroot/perl-Hash-Flatten'...
$ git fetch origin d16a4c782bfe1d9ff4020aa3a6e09200405a8703:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Hash-Flatten
 * [new ref]         d16a4c782bfe1d9ff4020aa3a6e09200405a8703 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d16a4c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild