19f9098968PR-URL: https://github.com/nodejs/node/pull/62898 Reviewed-By: Jordan Harband <ljharb@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
26 lines
No EOL
1.2 KiB
JavaScript
26 lines
No EOL
1.2 KiB
JavaScript
// Get the appropriate flag to use for creating files
|
|
// We use fmap on Windows platforms for files less than
|
|
// 512kb. This is a fairly low limit, but avoids making
|
|
// things slower in some cases. Since most of what this
|
|
// library is used for is extracting tarballs of many
|
|
// relatively small files in npm packages and the like,
|
|
// it can be a big boost on Windows platforms.
|
|
import fs from 'fs';
|
|
const platform = process.env.__FAKE_PLATFORM__ || process.platform;
|
|
const isWindows = platform === 'win32';
|
|
/* c8 ignore start */
|
|
const { O_CREAT, O_NOFOLLOW, O_TRUNC, O_WRONLY } = fs.constants;
|
|
const UV_FS_O_FILEMAP = Number(process.env.__FAKE_FS_O_FILENAME__) ||
|
|
fs.constants.UV_FS_O_FILEMAP ||
|
|
0;
|
|
/* c8 ignore stop */
|
|
const fMapEnabled = isWindows && !!UV_FS_O_FILEMAP;
|
|
const fMapLimit = 512 * 1024;
|
|
const fMapFlag = UV_FS_O_FILEMAP | O_TRUNC | O_CREAT | O_WRONLY;
|
|
const noFollowFlag = !isWindows && typeof O_NOFOLLOW === 'number' ?
|
|
O_NOFOLLOW | O_TRUNC | O_CREAT | O_WRONLY
|
|
: null;
|
|
export const getWriteFlag = noFollowFlag !== null ? () => noFollowFlag
|
|
: !fMapEnabled ? () => 'w'
|
|
: (size) => (size < fMapLimit ? fMapFlag : 'w');
|
|
//# sourceMappingURL=get-write-flag.js.map
|