$ git clone -n https://src.fedoraproject.org/rpms/vxl.git /var/lib/mock/f42-build-side-1-3573404-46767/root/chroot_tmpdir/scmroot/vxl
Cloning into '/var/lib/mock/f42-build-side-1-3573404-46767/root/chroot_tmpdir/scmroot/vxl'...
$ git fetch origin c2e4fc1a9796c49b9150e7b60ff26beb4dede197:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vxl
 * [new ref]         c2e4fc1a9796c49b9150e7b60ff26beb4dede197 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2e4fc1 fix: disable failing test