$ git clone -n https://src.fedoraproject.org/rpms/perl-PerlIO-gzip.git /var/lib/mock/f45-build-25822-613/root/chroot_tmpdir/scmroot/perl-PerlIO-gzip
Cloning into '/var/lib/mock/f45-build-25822-613/root/chroot_tmpdir/scmroot/perl-PerlIO-gzip'...
$ git fetch origin fc226c301280730cacc2d6490858f0edc4d21cac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PerlIO-gzip
 * [new ref]         fc226c301280730cacc2d6490858f0edc4d21cac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc226c3 Perl 5.44 rebuild