12483: Support O_TRUNC flag.

[arvados.git] / sdk / go / arvados / collection_fs.go

diff --git a/sdk/go/arvados/collection_fs.go b/sdk/go/arvados/collection_fs.go
index beddb9249b379ca0ec110b95bbd2ace0e9c94aff..e720b932878b16db407714733768dbfbd07d91d7 100644 (file)
--- a/sdk/go/arvados/collection_fs.go
+++ b/sdk/go/arvados/collection_fs.go
@@ -1061,6 +1061,14 @@ func (dn *dirnode) OpenFile(name string, flag int, perm os.FileMode) (*file, err
                dn.fileinfo.size++
        } else if flag&os.O_EXCL != 0 {
                return nil, ErrFileExists
+       } else if flag&os.O_TRUNC != 0 {
+               if !writable {
+                       return nil, fmt.Errorf("invalid flag O_TRUNC in read-only mode")
+               } else if fn, ok := n.(*filenode); !ok {
+                       return nil, fmt.Errorf("invalid flag O_TRUNC when opening directory")
+               } else {
+                       fn.Truncate(0)
+               }
        }
        return &file{
                inode:    n,