tests:sensors: add bpf cgroups sensor to test

This allows to load and test bpf cgroups programs.

Later we will move these bpf cgroups programs to be part of the
base sensor; until then let's babysit them here.

Signed-off-by: Djalal Harouni <[email protected]>

Author: tixxdz

pkg/sensors/test/cgroups.go

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Authors of Tetragon
+
+package test
+
+import (
+	"github.com/cilium/tetragon/pkg/kernels"
+	"github.com/cilium/tetragon/pkg/sensors"
+	"github.com/cilium/tetragon/pkg/sensors/program"
+)
+
+var (
+	CgroupMkdir = program.Builder(
+		"bpf_cgroup_mkdir.o",
+		"cgroup/cgroup_mkdir",
+		"raw_tracepoint/cgroup_mkdir",
+		"tg_tp_cgrp_mkdir",
+		"raw_tracepoint",
+	)
+
+	CgroupRmdir = program.Builder(
+		"bpf_cgroup_rmdir.o",
+		"cgroup/cgroup_rmdir",
+		"raw_tracepoint/cgroup_rmdir",
+		"tg_tp_cgrp_rmdir",
+		"raw_tracepoint",
+	)
+
+	CgroupRelease = program.Builder(
+		"bpf_cgroup_release.o",
+		"cgroup/cgroup_release",
+		"raw_tracepoint/cgroup_release",
+		"tg_tp_cgrp_release",
+		"raw_tracepoint",
+	)
+
+	/* Cgroup tracking maps */
+	CgroupsTrackingMap    = program.MapBuilder("tg_cgrps_tracking_map", CgroupMkdir)
+	CgroupsTrackingMapV53 = program.MapBuilder("tg_cgrps_tracking_map", CgroupMkdir)
+)
+
+func getCgroupsTrackingMap() *program.Map {
+	if kernels.EnableLargeProgs() {
+		return CgroupsTrackingMapV53
+	}
+	return CgroupsTrackingMap
+}
+
+func getCgroupPrograms() []*program.Program {
+	progs := []*program.Program{
+		CgroupMkdir,
+		CgroupRmdir,
+		CgroupRelease,
+	}
+	return progs
+}
+
+func getCgroupMaps() []*program.Map {
+	maps := []*program.Map{
+		getCgroupsTrackingMap(),
+	}
+	return maps
+}
+
+// GetCgroupSensor returns the Cgroups base sensor
+func GetCgroupSensor() *sensors.Sensor {
+	return &sensors.Sensor{
+		Name:  "test-sensor-cgroups",
+		Progs: getCgroupPrograms(),
+		Maps:  getCgroupMaps(),
+	}
+}