$ git clone -n https://src.fedoraproject.org/rpms/perl-GD.git /var/lib/mock/f41-build-817006-150570/root/chroot_tmpdir/scmroot/perl-GD
Cloning into '/var/lib/mock/f41-build-817006-150570/root/chroot_tmpdir/scmroot/perl-GD'...
$ git fetch origin 920303f9a86bced77d578f53cfc10cac26842d2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-GD
 * [new ref]         920303f9a86bced77d578f53cfc10cac26842d2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 920303f Update to 2.83