Function writeFile

src/main/electron.js:3171–3226

()

	await assertWritablePath(bkpPath);

	var writeFile = async function()
	{
		let fh;

		try
		{
			// O_SYNC is for sync I/O and reduce risk of file corruption
			fh = await fsProm.open(fileObject.path, O_SYNC | O_CREAT | O_WRONLY | O_TRUNC);
			await fsProm.writeFile(fh, data, writeEnc);
			await fh.sync(); // Flush to disk
		}
		finally
		{
			await fh?.close();
		}

		let stat2 = await fsProm.stat(fileObject.path);
		// Workaround for possible writing errors is to check the written
		// contents of the file and retry 3 times before showing an error
		let writtenData = await fsProm.readFile(fileObject.path, writeEnc);
		
		if (data != writtenData)
		{
			retryCount++;
			
			if (retryCount < 3)
			{
				return await writeFile();
			}
			else
			{
				throw new Error('all saving trials failed');
			}
		}
		else
		{
			//We'll keep the backup file in case the original file is corrupted. TODO When should we delete the backup file?
			if (backupCreated)
			{
				//fs.unlink(bkpPath, (err) => {}); //Ignore errors!

				//Delete old backup file with old prefix
				if (fs.existsSync(oldBkpPath))
				{
					try
					{
						await assertWritablePath(oldBkpPath);
						fs.unlink(oldBkpPath, (err) => {}); //Ignore errors
					}
					catch (e) {} //Ignore — path failed authorisation, skip cleanup.
				}
			}

			return stat2;
		}
	};
	
	async function doSaveFile(isNew)