$ git clone -n https://src.fedoraproject.org/rpms/yara.git /var/lib/mock/f42-build-863114-171404/root/chroot_tmpdir/scmroot/yara
Cloning into '/var/lib/mock/f42-build-863114-171404/root/chroot_tmpdir/scmroot/yara'...
$ git fetch origin 416511b0fbeab19afe8282164f90ecaca9359613:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yara
 * [new ref]         416511b0fbeab19afe8282164f90ecaca9359613 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 416511b Rebuild for Jansson 2.14 (https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/3PYINSQGKQ4BB25NQUI2A2UCGGLAG5ND/)