$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON-XS.git /var/lib/mock/f45-build-24307-603/root/chroot_tmpdir/scmroot/perl-JSON-XS
Cloning into '/var/lib/mock/f45-build-24307-603/root/chroot_tmpdir/scmroot/perl-JSON-XS'...
$ git fetch origin 6c62f17290c7d3d9b393ce0c8c51504f121a668e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON-XS
 * [new ref]         6c62f17290c7d3d9b393ce0c8c51504f121a668e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c62f17 Perl 5.44 rebuild