$ git clone -n https://src.fedoraproject.org/rpms/perl-Log-Report.git /var/lib/mock/f40-build-2018647-46443/root/chroot_tmpdir/scmroot/perl-Log-Report
Cloning into '/var/lib/mock/f40-build-2018647-46443/root/chroot_tmpdir/scmroot/perl-Log-Report'...
$ git fetch origin a678dabf115ce3d62807c1a78a7935fa30b2742c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Log-Report
 * [new ref]         a678dabf115ce3d62807c1a78a7935fa30b2742c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a678dab Cache 1.36 sources