VersionString() API selftest

Signed-off-by: grantseltzer <grantseltzer@gmail.com>

selftest/version/Makefile

@@ -0,0 +1 @@
+../common/Makefile

selftest/version/go.mod

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+module github.com/aquasecurity/libbpfgo/selftest/perfbuffers
+
+go 1.16
+
+require github.com/aquasecurity/libbpfgo v0.2.1-libbpf-0.4.0
+
+replace github.com/aquasecurity/libbpfgo => ../../

selftest/version/go.sum

@@ -0,0 +1,11 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20210514084401-e8d321eab015/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

selftest/version/main.bpf.c

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+//+build ignore
+#ifdef asm_inline
+#undef asm_inline
+#define asm_inline asm
+#endif
+

selftest/version/main.go

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+package main
+
+import "C"
+
+import (
+	"log"
+	"os/exec"
+	"strings"
+
+	"github.com/aquasecurity/libbpfgo"
+)
+
+func main() {
+
+	cmd := exec.Command("git", "describe", "--tags")
+	cmd.Dir = "../../libbpf"
+
+	b, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// libbpf doesn't put the patch version in exported version
+	// symbols, so use just prefix to exclude it
+	if strings.HasPrefix(libbpfgo.VersionString(), string(b)) {
+		log.Fatalf("Error reading exported symbols for libbpf major and minor version: %s is not %s", libbpfgo.VersionString(), b)
+	}
+}

selftest/version/run.sh

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+../common/run-5.8.sh