pnpm
Version:
Fast, disk space efficient package manager
69 lines • 2.44 kB
JavaScript
;
const betterPathResolve = require("better-path-resolve");
const fs = require("mz/fs");
const path = require("path");
const mkdirp = require("mkdirp-promise");
const isWindows = require("is-windows");
const renameOverwrite = require("rename-overwrite");
const IS_WINDOWS = isWindows();
// Always use "junctions" on Windows. Even though support for "symbolic links" was added in Vista+, users by default
// lack permission to create them
const symlinkType = IS_WINDOWS ? 'junction' : 'dir';
const resolveSrc = IS_WINDOWS ? resolveSrcOnWin : resolveSrcOnNonWin;
function resolveSrcOnWin(src, dest) {
return `${src}\\`;
}
function resolveSrcOnNonWin(src, dest) {
return path.relative(path.dirname(dest), src);
}
async function symlinkDir(src, dest) {
dest = betterPathResolve(dest);
src = betterPathResolve(src);
if (src === dest)
throw new Error(`Symlink path is the same as the target path (${src})`);
src = resolveSrc(src, dest);
try {
return await forceSymlink(src, dest);
}
catch (err) {
if (err.code === 'ENOENT') {
await mkdirp(path.dirname(dest));
return await forceSymlink(src, dest);
}
throw err;
}
}
/**
* Creates a symlink. Re-link if a symlink already exists at the supplied
* srcPath. API compatible with [`fs#symlink`](https://nodejs.org/api/fs.html#fs_fs_symlink_srcpath_dstpath_type_callback).
*/
async function forceSymlink(src, dest) {
try {
await fs.symlink(src, dest, symlinkType);
return { reused: false };
}
catch (err) {
if (err.code !== 'EEXIST')
throw err;
}
let linkString;
try {
linkString = await fs.readlink(dest);
}
catch (err) {
// Dest is not a link
const parentDir = path.dirname(dest);
const ignore = `.ignored_${path.basename(dest)}`;
await renameOverwrite(dest, path.join(parentDir, ignore));
return Object.assign({}, await forceSymlink(src, dest), { warn: `Symlink wanted name was occupied by directory or file. Old entity moved: "${parentDir}${path.sep}{${path.basename(dest)} => ${ignore}}".` });
}
if (src === linkString) {
return { reused: true };
}
await fs.unlink(dest);
return await forceSymlink(src, dest);
}
// for backward compatibility
symlinkDir['default'] = symlinkDir;
module.exports = symlinkDir;
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