$ git clone -n https://src.fedoraproject.org/rpms/flexiblas.git /var/lib/mock/f42-build-3273064-41309/root/chroot_tmpdir/scmroot/flexiblas
Cloning into '/var/lib/mock/f42-build-3273064-41309/root/chroot_tmpdir/scmroot/flexiblas'...
$ git fetch origin 7039033d0c9fdf3e13e4b6eef95a23ca44b49ed0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flexiblas
 * [new ref]         7039033d0c9fdf3e13e4b6eef95a23ca44b49ed0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7039033 Update to 3.4.5