pkg/build: share extractRootCause with openbsd

* pkg/build: share extractRootCause with openbsd

This should get kernel build errors reported in syz-ci console.

* Add a test

* lint

1 files changed, 0 insertions, 37 deletions

diff --git a/pkg/build/linux.go b/pkg/build/linux.go
index dbe9cfbb7..f4dff538f 100644
--- a/pkg/build/linux.go
+++ b/pkg/build/linux.go
@@ -10,7 +10,6 @@
 package build
 
 import (
-	"bytes"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -124,39 +123,3 @@ func (linux) clean(kernelDir string) error {
 	_, err := osutil.Run(10*time.Minute, cmd)
 	return err
 }
-
-func extractRootCause(err error) error {
-	verr, ok := err.(*osutil.VerboseError)
-	if !ok {
-		return err
-	}
-	var cause []byte
-	for _, line := range bytes.Split(verr.Output, []byte{'\n'}) {
-		for _, pattern := range buildFailureCauses {
-			if pattern.weak && cause != nil {
-				continue
-			}
-			if bytes.Contains(line, pattern.pattern) {
-				cause = line
-				break
-			}
-		}
-	}
-	if cause != nil {
-		verr.Title = string(cause)
-	}
-	return KernelBuildError{verr}
-}
-
-type buildFailureCause struct {
-	pattern []byte
-	weak    bool
-}
-
-var buildFailureCauses = [...]buildFailureCause{
-	{pattern: []byte(": error: ")},
-	{pattern: []byte(": fatal error: ")},
-	{pattern: []byte(": undefined reference to")},
-	{weak: true, pattern: []byte(": final link failed: ")},
-	{weak: true, pattern: []byte("collect2: error: ")},
-}