$ git clone -n https://src.fedoraproject.org/rpms/perl-PerlIO-buffersize.git /var/lib/mock/f41-build-816312-150086/root/chroot_tmpdir/scmroot/perl-PerlIO-buffersize
Cloning into '/var/lib/mock/f41-build-816312-150086/root/chroot_tmpdir/scmroot/perl-PerlIO-buffersize'...
$ git fetch origin 5204475d49d65a4de90bb3e138c49672685f94cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PerlIO-buffersize
 * [new ref]         5204475d49d65a4de90bb3e138c49672685f94cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5204475 Perl 5.40 rebuild