$ git clone -n https://src.fedoraproject.org/rpms/rubygem-domain_name.git /var/lib/mock/f40-build-2250297-54043/root/chroot_tmpdir/scmroot/rubygem-domain_name
Cloning into '/var/lib/mock/f40-build-2250297-54043/root/chroot_tmpdir/scmroot/rubygem-domain_name'...
$ git fetch origin 5b5795759ba05e56f0fce1de3c40b26fe95135fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-domain_name
 * [new ref]         5b5795759ba05e56f0fce1de3c40b26fe95135fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b57957 0.6.20240107