selftest: add VersionString() selftest (#139)

libbpfgo.go

@@ -127,8 +127,9 @@ func MinorVersion() int {
 	return C.LIBBPF_MINOR_VERSION
 }
 
-// VersionString returns the string representation of the libbpf version.
-func VersionString() string {
+// LibbpfVersionString returns the string representation of the libbpf version which
+// libbpfgo is linked against
+func LibbpfVersionString() string {
 	return fmt.Sprintf("v%d.%d", MajorVersion(), MinorVersion())
 }
 

selftest/version/Makefile

@@ -0,0 +1,91 @@
+BASEDIR = $(abspath ../../)
+
+OUTPUT = ../../output
+
+LIBBPF_SRC = $(abspath ../../libbpf/src)
+LIBBPF_OBJ = $(abspath $(OUTPUT)/libbpf.a)
+
+CC = gcc
+CLANG = clang
+
+ARCH := $(shell uname -m)
+ARCH := $(subst x86_64,amd64,$(ARCH))
+
+CFLAGS = -g -O2 -Wall -fpie
+LDFLAGS =
+
+CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT))"
+CGO_LDFLAGS_STATIC = "-lelf -lz $(LIBBPF_OBJ)"
+CGO_EXTLDFLAGS_STATIC = '-w -extldflags "-static"'
+
+CGO_CFGLAGS_DYN = "-I. -I/usr/include/"
+CGO_LDFLAGS_DYN = "-lelf -lz -lbpf"
+
+.PHONY: $(TEST)
+.PHONY: $(TEST).go
+.PHONY: $(TEST).bpf.c
+
+TEST = main
+
+all: $(TEST)-static
+
+.PHONY: libbpfgo
+.PHONY: libbpfgo-static
+.PHONY: libbpfgo-dynamic
+
+## libbpfgo
+
+libbpfgo-static:
+	$(MAKE) -C $(BASEDIR) libbpfgo-static
+
+libbpfgo-dynamic:
+	$(MAKE) -C $(BASEDIR) libbpfgo-dynamic
+
+vmlinuxh:
+	$(MAKE) -C $(BASEDIR) vmlinuxh
+
+outputdir:
+	$(MAKE) -C $(BASEDIR) outputdir
+
+## test bpf dependency
+
+$(TEST).bpf.o: $(TEST).bpf.c
+	$(MAKE) -C $(BASEDIR) vmlinuxh
+	$(CLANG) $(CFLAGS) -target bpf -I$(OUTPUT) -c $< -o $@
+
+## test
+
+.PHONY: $(TEST)-static
+.PHONY: $(TEST)-dynamic
+
+$(TEST)-static: libbpfgo-static | $(TEST).bpf.o
+	CC=$(CLANG) \
+		CGO_CFLAGS=$(CGO_CFLAGS_STATIC) \
+		CGO_LDFLAGS=$(CGO_LDFLAGS_STATIC) \
+		GOOS=linux GOARCH=$(ARCH) \
+		go build \
+		-tags netgo -ldflags $(CGO_EXTLDFLAGS_STATIC) \
+		-o $(TEST)-static ./$(TEST).go
+
+$(TEST)-dynamic: libbpfgo-dynamic | $(TEST).bpf.o
+	CC=$(CLANG) \
+		CGO_CFLAGS=$(CGO_CFLAGS_DYN) \
+		CGO_LDFLAGS=$(CGO_LDFLAGS_DYN) \
+		go build -o ./$(TEST)-dynamic ./$(TEST).go
+
+## run
+
+.PHONY: run
+.PHONY: run-static
+.PHONY: run-dynamic
+
+run: run-static
+
+run-static: $(TEST)-static
+	./run.sh $(TEST)-static
+
+run-dynamic: $(TEST)-dynamic
+	./run.sh $(TEST)-dynamic
+
+clean:
+	rm -f *.o *-static *-dynamic

selftest/version/go.mod

@@ -0,0 +1,7 @@
+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

@@ -0,0 +1,6 @@
+//+build ignore
+#ifdef asm_inline
+#undef asm_inline
+#define asm_inline asm
+#endif
+

selftest/version/main.go

@@ -0,0 +1,26 @@
+package main
+
+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(string(b), err)
+	}
+
+	// libbpf doesn't put the patch version in exported version
+	// symbols, so use just prefix to exclude it
+	if strings.HasPrefix(libbpfgo.LibbpfVersionString(), string(b)) {
+		log.Fatalf("Error reading exported symbols for libbpf major and minor version: %s is not %s", libbpfgo.LibbpfVersionString(), b)
+	}
+}

selftest/version/run.sh

@@ -0,0 +1 @@
+../common/run-5.8.sh