$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-LibIDN.git /var/lib/mock/f45-build-25329-610/root/chroot_tmpdir/scmroot/perl-Net-LibIDN
Cloning into '/var/lib/mock/f45-build-25329-610/root/chroot_tmpdir/scmroot/perl-Net-LibIDN'...
$ git fetch origin a0e69d70f07fb86805dad8af3b55e554d2260a30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-LibIDN
 * [new ref]         a0e69d70f07fb86805dad8af3b55e554d2260a30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0e69d7 Perl 5.44 rebuild