Handle file close in defer better

Improve the handling of file close in defer
by checking for possible errors during the close

pkg/lib/harness/llm-harness.go

@@ -61,7 +61,7 @@ func (harness *LLMHarness) Init() error {
 	return nil
 }
 
-func (harness *LLMHarness) Start(modelPath string) error {
+func (harness *LLMHarness) Start(modelPath string) (err error) {
 
 	harnessPath := constants.HarnessPath(harness.ConfigHome)
 	pidFile := filepath.Join(harnessPath, constants.HarnessProcessFile)
@@ -108,7 +108,17 @@ func (harness *LLMHarness) Start(modelPath string) error {
 	if err != nil {
 		return fmt.Errorf("failed to open log file for harness: %w", err)
 	}
-	defer logs.Close()
+
+	defer func() {
+		if errClose := logs.Close(); errClose != nil {
+			if err == nil {
+				err = fmt.Errorf("failed to close log file: %w", errClose)
+			} else {
+				err = fmt.Errorf("%v; failed to close log file: %w", err, errClose)
+			}
+		}
+	}()
+
 	output.Debugf("Saving server logs to %s", logFile)
 	cmd.Stdout = logs
 	cmd.Stderr = logs

pkg/lib/harness/llm_payload_all.go

@@ -29,7 +29,7 @@ import (
 	"kitops/pkg/lib/filesystem"
 )
 
-func extractFile(fs fs.FS, file, harnessHome string) error {
+func extractFile(fs fs.FS, file, harnessHome string) (err error) {
 	srcFile, err := fs.Open(file)
 	if err != nil {
 		return fmt.Errorf("failed to open file %s: %w", file, err)
@@ -62,15 +62,15 @@ func extractFile(fs fs.FS, file, harnessHome string) error {
 	if err != nil {
 		return fmt.Errorf("failed to create destination file %s: %w", destFile, err)
 	}
-	defer dest.Close()
+	deferCloseFile(dest, &err, "failed to close destination file")
 
 	if _, err := io.Copy(dest, srcReader); err != nil {
 		return fmt.Errorf("failed to copy payload to %s: %w", destFile, err)
 	}
 	return nil
 }
 
-func extractTar(tr *tar.Reader, dir string) error {
+func extractTar(tr *tar.Reader, dir string) (err error) {
 	for {
 		header, err := tr.Next()
 		if err == io.EOF {
@@ -102,7 +102,7 @@ func extractTar(tr *tar.Reader, dir string) error {
 			if err != nil {
 				return fmt.Errorf("failed to create file %s: %w", outPath, err)
 			}
-			defer file.Close()
+			deferCloseFile(file, &err, "failed to close destination file")
 
 			written, err := io.Copy(file, tr)
 			if err != nil {
@@ -118,3 +118,15 @@ func extractTar(tr *tar.Reader, dir string) error {
 	}
 	return nil
 }
+
+func deferCloseFile(f *os.File, err *error, msg string) {
+    defer func() {
+        if cerr := f.Close(); cerr != nil {
+            if *err == nil {
+                *err = fmt.Errorf("%s: %w", msg, cerr)
+            } else {
+                *err = fmt.Errorf("%v; %s: %w", *err, msg, cerr)
+            }
+        }
+    }()
+}