$ git clone -n https://src.fedoraproject.org/rpms/rubygem-uuid.git /var/lib/mock/f39-build-1667359-40811/root/chroot_tmpdir/scmroot/rubygem-uuid
Cloning into '/var/lib/mock/f39-build-1667359-40811/root/chroot_tmpdir/scmroot/rubygem-uuid'...
$ git fetch origin ce20bc1b1aaf38cd6ed8638ef431267da25bdb4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-uuid
 * [new ref]         ce20bc1b1aaf38cd6ed8638ef431267da25bdb4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce20bc1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild