$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-LibIDN2.git /var/lib/mock/f41-build-817015-150572/root/chroot_tmpdir/scmroot/perl-Net-LibIDN2
Cloning into '/var/lib/mock/f41-build-817015-150572/root/chroot_tmpdir/scmroot/perl-Net-LibIDN2'...
$ git fetch origin 4c48e4f23f86f96bdc1a41e34ebb40ad29c37446:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-LibIDN2
 * [new ref]         4c48e4f23f86f96bdc1a41e34ebb40ad29c37446 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c48e4f Perl 5.40 rebuild