add minikube over virtualbox cgroup format (#882)

tap/tlstapper/bpf-builder/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3
+FROM alpine:3.14
 
 RUN apk --no-cache update && apk --no-cache add clang llvm libbpf-dev go linux-headers
 

tap/tlstapper/tls_process_discoverer.go

@@ -132,8 +132,22 @@ func extractCgroup(lines []string) string {
 	return ""
 }
 
+// cgroup in the /proc/<pid>/cgroup may look something like
+//
+//  /system.slice/docker-<ID>.scope
+//  /system.slice/containerd-<ID>.scope
+//  /kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod3beae8e0_164d_4689_a087_efd902d8c2ab.slice/docker-<ID>.scope
+//  /kubepods/besteffort/pod7709c1d5-447c-428f-bed9-8ddec35c93f4/<ID>
+//
+// This function extract the <ID> out of the cgroup path, the <ID> should match 
+//	the "Container ID:" field when running kubectl describe pod <POD>
+//
 func normalizeCgroup(cgrouppath string) string {
 	basename := strings.TrimSpace(path.Base(cgrouppath))
+	
+	if strings.Contains(basename, "-") {
+		basename = basename[strings.Index(basename, "-") + 1:]
+	}
 
 	if strings.Contains(basename, ".") {
 		return strings.TrimSuffix(basename, filepath.Ext(basename))

tap/tlstapper/tlstapper_bpfeb.go

@@ -1,5 +1,4 @@
 // Code generated by bpf2go; DO NOT EDIT.
-//go:build arm64be || armbe || mips || mips64 || mips64p32 || ppc64 || s390 || s390x || sparc || sparc64
 // +build arm64be armbe mips mips64 mips64p32 ppc64 s390 s390x sparc sparc64
 
 package tlstapper

tap/tlstapper/tlstapper_bpfel.go

@@ -1,5 +1,4 @@
 // Code generated by bpf2go; DO NOT EDIT.
-//go:build 386 || amd64 || amd64p32 || arm || arm64 || mips64le || mips64p32le || mipsle || ppc64le || riscv64
 // +build 386 amd64 amd64p32 arm arm64 mips64le mips64p32le mipsle ppc64le riscv64
 
 package tlstapper