Further plumb CRI/containerd in sysdig (#1376)

Signed-off-by: Spencer Krum <nibz@spencerkrum.com>

sysdig-CLA-1.0-contributing-entity: International Business Machines
sysdig-CLA-1.0-signed-off-by: Spencer Krum <skrum@us.ibm.com>

userspace/libsinsp/k8s_state.cpp

@@ -34,6 +34,7 @@ limitations under the License.
 
 const std::string k8s_state_t::m_docker_prefix = "docker://";
 const std::string k8s_state_t::m_rkt_prefix = "rkt://";
+const std::string k8s_state_t::m_containerd_prefix = "containerd://";
 const unsigned    k8s_state_t::m_id_length = 12u;
 
 k8s_state_t::k8s_state_t(bool is_captured, int capture_version):
@@ -70,8 +71,15 @@ void k8s_state_t::cache_pod(container_pod_map& map, const std::string& id, const
 		map[id.substr(m_rkt_prefix.size())] = pod;
 		return;
 	}
-	throw sinsp_exception("Invalid container ID (expected '" + m_docker_prefix +
-						  "{ID}' or '" + m_rkt_prefix + "{ID}'): " + id);
+	pos = id.find(m_containerd_prefix);
+	if( pos == 0)
+	{
+		map[id.substr(m_containerd_prefix.size(), m_id_length)] = pod;
+		return;
+	}
+	throw sinsp_exception("Invalid container ID (expected one of: '" + m_docker_prefix +
+						 "{ID}', '" + m_rkt_prefix + "{ID}', '" + m_containerd_prefix +
+						 "{ID}'): " + id);
 }
 
 bool k8s_state_t::has_pod(k8s_pod_t& pod)

userspace/libsinsp/k8s_state.h

@@ -353,6 +353,7 @@ class k8s_state_t
 
 	static const std::string m_docker_prefix; // "docker://"
 	static const std::string m_rkt_prefix; // "rkt://"
+	static const std::string m_containerd_prefix; // "containerd://"
 	static const unsigned    m_id_length; // portion of the ID to be cached (=12)
 
 #ifndef HAS_ANALYZER