Don't pass file paths as strings.

Instead of passing file paths as strings, now pass os.File or directory paths
for compile_commands.json since it's always named that.

PiperOrigin-RevId: 657349644

tools/nvidia_driver_differ/parser/clang_config.go

@@ -18,6 +18,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"path"
 )
 
 // ClangASTConfig is the format for compilation_commands.json.
@@ -42,11 +43,12 @@ func NewParserConfig(directory, filename string, includes []string) ClangASTConf
 	}
 }
 
-// CreateCompileCommandsFile writes the given config to file.
-func CreateCompileCommandsFile(config []ClangASTConfig, path string) error {
-	f, err := os.Create(path)
+// CreateCompileCommandsFile creates a new compile_commands.json file in the given directory, and
+// writes config to it.
+func CreateCompileCommandsFile(dir string, config []ClangASTConfig) error {
+	f, err := os.Create(path.Join(dir, "compile_commands.json"))
 	if err != nil {
-		return fmt.Errorf("failed to create %s: %w", path, err)
+		return fmt.Errorf("failed to create compile_commands.json: %w", err)
 	}
 	defer f.Close()
 

tools/nvidia_driver_differ/parser/sources.go

@@ -17,7 +17,7 @@ package parser
 import (
 	"bufio"
 	"fmt"
-	"os"
+	"io"
 	"path/filepath"
 )
 
@@ -83,19 +83,13 @@ func (d *DriverSourceDir) GetUVMIncludePaths() []string {
 }
 
 // WriteIncludeFile writes an cc file at file that includes all the given sources.
-func WriteIncludeFile(sources []string, path string) error {
-	f, err := os.Create(path)
-	if err != nil {
-		return fmt.Errorf("failed to create include file: %w", err)
-	}
-	defer f.Close()
-
-	w := bufio.NewWriter(f)
+func WriteIncludeFile(sources []string, w io.Writer) error {
+	bufW := bufio.NewWriter(w)
 	for _, source := range sources {
-		if _, err := w.WriteString(fmt.Sprintf("#include \"%s\"\n", source)); err != nil {
+		if _, err := bufW.WriteString(fmt.Sprintf("#include \"%s\"\n", source)); err != nil {
 			return fmt.Errorf("failed to write to include file: %w", err)
 		}
 	}
 
-	return w.Flush()
+	return bufW.Flush()
 }