fix(pkg/driverbuilder): fix local executor to correctly fetch KERNE…

…LDIR.

Signed-off-by: Federico Di Pierro <[email protected]>

pkg/driverbuilder/local.go

@@ -2,6 +2,7 @@ package driverbuilder
 
 import (
 	"bufio"
+	"bytes"
 	"context"
 	_ "embed"
 	"errors"
@@ -13,7 +14,6 @@ import (
 	"os/exec"
 	"os/user"
 	"path/filepath"
-	"strings"
 	"time"
 )
 
@@ -69,10 +69,21 @@ func (lbp *LocalBuildProcessor) Start(b *builder.Build) error {
 		if err == nil {
 			slog.Info("Trying automatic kernel headers download.")
 			kernelDownloadScript, err := builder.KernelDownloadScript(realBuilder, nil, kr)
+			// Patch kernel download script to echo KERNELDIR.
+			// We need to capture KERNELDIR to later pass it as env variable to the build.
+			kernelDownloadScript += "\necho $KERNELDIR"
 			if err == nil {
 				out, err := exec.Command("bash", "-c", kernelDownloadScript).Output()
 				if err == nil {
-					path := strings.TrimSuffix(string(out), "\n")
+					// Scan all stdout line by line and
+					// store last line as KERNELDIR path.
+					reader := bytes.NewReader(out)
+					scanner := bufio.NewScanner(reader)
+					var path string
+					for scanner.Scan() {
+						path = scanner.Text()
+					}
+					slog.Warn("Setting KERNELDIR", "path", path)
 					// add the kerneldir path to env
 					lbp.envMap[kernelDirEnv] = path
 					defer func() {