error on out of space

files/public.go

@@ -15,6 +15,10 @@ import (
 	"github.com/saracen/walker"
 )
 
+// syncFile is a seam to allow tests to force fsync failures (e.g. ENOSPC).
+// In production it calls (*os.File).Sync().
+var syncFile = func(f *os.File) error { return f.Sync() }
+
 // PublishedStorage abstract file system with public dirs (published repos)
 type PublishedStorage struct {
 	rootPath     string
@@ -25,7 +29,7 @@ type PublishedStorage struct {
 // Global mutex map to prevent concurrent access to the same destinationPath in LinkFromPool
 var (
 	fileLockMutex sync.Mutex
-	fileLocks = make(map[string]*sync.Mutex)
+	fileLocks     = make(map[string]*sync.Mutex)
 )
 
 // getFileLock returns a mutex for a specific file path to prevent concurrent modifications
@@ -119,7 +123,17 @@ func (storage *PublishedStorage) PutFile(path string, sourceFilename string) err
 	}()
 
 	_, err = io.Copy(f, source)
-	return err
+	if err != nil {
+		return err
+	}
+
+	// Sync to ensure all data is written to disk and catch ENOSPC errors
+	err = syncFile(f)
+	if err != nil {
+		return fmt.Errorf("error syncing file %s: %s", path, err)
+	}
+
+	return nil
 }
 
 // Remove removes single file under public path
@@ -268,6 +282,13 @@ func (storage *PublishedStorage) LinkFromPool(publishedPrefix, publishedRelPath,
 			return err
 		}
 
+		// Sync to ensure all data is written to disk and catch ENOSPC errors
+		err = syncFile(dst)
+		if err != nil {
+			_ = dst.Close()
+			return fmt.Errorf("error syncing file %s: %s", destinationPath, err)
+		}
+
 		err = dst.Close()
 	} else if storage.linkMethod == LinkMethodSymLink {
 		err = localSourcePool.Symlink(sourcePath, destinationPath)