$ git clone -n https://src.fedoraproject.org/rpms/perl-Text-Xslate.git /var/lib/mock/f41-build-1211651-22574/root/chroot_tmpdir/scmroot/perl-Text-Xslate
Cloning into '/var/lib/mock/f41-build-1211651-22574/root/chroot_tmpdir/scmroot/perl-Text-Xslate'...
$ git fetch origin bb7813961cfff9d901139762e98832114cab2a8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Text-Xslate
 * [new ref]         bb7813961cfff9d901139762e98832114cab2a8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb78139 Perl 5.40 rebuild