internal/kconfig: move Find to package linux

Move Find to package linux, since it depends on deriving a
file name from the current linux kernel version.

This means that package kconfig only implements parsing of
the kconfig format.

Signed-off-by: Lorenz Bauer <[email protected]>

Author: lmb

collection.go

@@ -652,7 +652,7 @@ func resolveKconfig(m *MapSpec) error {
 
 	// We only parse kconfig file if a CONFIG_* variable was found.
 	if len(configs) > 0 {
-		f, err := kconfig.Find()
+		f, err := linux.FindKConfig()
 		if err != nil {
 			return fmt.Errorf("cannot find a kconfig file: %w", err)
 		}

internal/kconfig/kconfig.go

@@ -1,3 +1,4 @@
+// Package kconfig implements a parser for the format of Linux's .config file.
 package kconfig
 
 import (
@@ -7,39 +8,13 @@ import (
 	"fmt"
 	"io"
 	"math"
-	"os"
 	"strconv"
 	"strings"
 
 	"github.com/cilium/ebpf/btf"
 	"github.com/cilium/ebpf/internal"
-	"github.com/cilium/ebpf/internal/linux"
 )
 
-// Find find a kconfig file on the host.
-// It first reads from /boot/config- of the current running kernel and tries
-// /proc/config.gz if nothing was found in /boot.
-// If none of the file provide a kconfig, it returns an error.
-func Find() (*os.File, error) {
-	kernelRelease, err := linux.KernelRelease()
-	if err != nil {
-		return nil, fmt.Errorf("cannot get kernel release: %w", err)
-	}
-
-	path := "/boot/config-" + kernelRelease
-	f, err := os.Open(path)
-	if err == nil {
-		return f, nil
-	}
-
-	f, err = os.Open("/proc/config.gz")
-	if err == nil {
-		return f, nil
-	}
-
-	return nil, fmt.Errorf("neither %s nor /proc/config.gz provide a kconfig", path)
-}
-
 // Parse parses the kconfig file for which a reader is given.
 // All the CONFIG_* which are in filter and which are set set will be
 // put in the returned map as key with their corresponding value as map value.

internal/linux/kconfig.go

@@ -0,0 +1,31 @@
+package linux
+
+import (
+	"fmt"
+	"os"
+)
+
+// FindKConfig searches for a kconfig file on the host.
+//
+// It first reads from /boot/config- of the current running kernel and tries
+// /proc/config.gz if nothing was found in /boot.
+// If none of the file provide a kconfig, it returns an error.
+func FindKConfig() (*os.File, error) {
+	kernelRelease, err := KernelRelease()
+	if err != nil {
+		return nil, fmt.Errorf("cannot get kernel release: %w", err)
+	}
+
+	path := "/boot/config-" + kernelRelease
+	f, err := os.Open(path)
+	if err == nil {
+		return f, nil
+	}
+
+	f, err = os.Open("/proc/config.gz")
+	if err == nil {
+		return f, nil
+	}
+
+	return nil, fmt.Errorf("neither %s nor /proc/config.gz provide a kconfig", path)
+}