Fix bug where saving a file resets the permissions (when owner/root at least)

README.md

@@ -48,6 +48,7 @@ This will add a Workspace folder linked to a SSH (SFTP) session:
 ![Workspace folder added](./media/screenshot-explorer.png)
 
 ## TO DO *(in order of most likely to implement first)*
+* ~~Fix bug where saving a file resets the permissions (when owner/root at least)~~ **DONE**
 * Fix bug where the Explorer shows a loading bar forever
 * Fix bug where VSCode shows an error message about `no provider for ssh://NAME/`
 * An icon for the extension

src/sshFileSystem.ts

@@ -71,9 +71,10 @@ export class SSHFileSystem implements vscode.FileSystemProvider {
     });
   }
   public writeFile(uri: vscode.Uri, content: Uint8Array, options: { create: boolean; overwrite: boolean; }): void | Promise<void> {
-    return new Promise((resolve, reject) => {
+    return new Promise(async (resolve, reject) => {
+      const stat = await toPromise<ssh2s.Stats>(cb => this.sftp.stat(this.relative(uri.path), cb));
       const array = new Buffer(0);
-      const stream = this.sftp.createWriteStream(this.relative(uri.path));
+      const stream = this.sftp.createWriteStream(this.relative(uri.path), { mode: stat.mode });
       stream.on('error', reject);
       stream.end(content, resolve);
     });