$ git clone -n https://src.fedoraproject.org/rpms/rubygem-unf.git /var/lib/mock/f39-build-1499434-34744/root/chroot_tmpdir/scmroot/rubygem-unf
Cloning into '/var/lib/mock/f39-build-1499434-34744/root/chroot_tmpdir/scmroot/rubygem-unf'...
$ git fetch origin fce4b98470bba47e252948851db25d770c487354:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-unf
 * [new ref]         fce4b98470bba47e252948851db25d770c487354 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fce4b98 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild