Try to fix hardlink failures.

Author: mitchell-as

internal/unarchiver/unarchiver.go

@@ -133,6 +133,20 @@ func writeNewHardLink(fpath string, target string) error {
 		return fmt.Errorf("%s: making directory for file: %v", fpath, err)
 	}
 
+	// The unarchiving process is unordered, and a hardlinked file's target may not yet exist.
+	// Create it. writeNewFile() will overwrite it later, which is okay.
+	if !fileExists(target) {
+		err = os.MkdirAll(filepath.Dir(target), 0755)
+		if err != nil {
+			return fmt.Errorf("%s: making directory for file: %v", target, err)
+		}
+		f, err := os.Create(target)
+		if err != nil {
+			return fmt.Errorf("%s: creating target file: %v", target, err)
+		}
+		f.Close()
+	}
+
 	err = os.Link(target, fpath)
 	if err != nil {
 		return fmt.Errorf("%s: making hard link for: %v", fpath, err)