corepack enable does not work on broken symlink

[krombel]

When running corepack enable the links are not properly updated.

I updated the node version with brew and now all symlinks previously enabled with corepack are broken.

MacBookPro:bin mk42$ corepack disable
MacBookPro:bin mk42$ corepack enable 
Internal Error: EEXIST: file already exists, symlink '../Cellar/node@22/22.20.0_2/lib/node_modules/corepack/dist/yarn.js' -> '/opt/homebrew/bin/yarn'
    at async Object.symlink (node:internal/fs/promises:1008:10)
    at async EnableCommand.generatePosixLink (/opt/homebrew/Cellar/node@22/22.20.0_2/lib/node_modules/corepack/dist/lib/corepack.cjs:23168:5)
    at async Promise.all (index 2)
    at async EnableCommand.execute (/opt/homebrew/Cellar/node@22/22.20.0_2/lib/node_modules/corepack/dist/lib/corepack.cjs:23151:5)
    at async EnableCommand.validateAndExecute (/opt/homebrew/Cellar/node@22/22.20.0_2/lib/node_modules/corepack/dist/lib/corepack.cjs:20258:22)
    at async _Cli.run (/opt/homebrew/Cellar/node@22/22.20.0_2/lib/node_modules/corepack/dist/lib/corepack.cjs:21195:18)
    at async Object.runMain (/opt/homebrew/Cellar/node@22/22.20.0_2/lib/node_modules/corepack/dist/lib/corepack.cjs:23654:19)

The issue seems to be here:

corepack/sources/commands/Enable.ts

Lines 81 to 100 in 0b492c9

	async generatePosixLink(installDirectory: string, distFolder: string, binName: string) {
	const file = path.join(installDirectory, binName);
	const symlink = path.relative(installDirectory, path.join(distFolder, `${binName}.js`));
	if (fs.existsSync(file)) {
	const currentSymlink = await fs.promises.readlink(file);
	if (binName.includes(`yarn`) && corepackUtils.isYarnSwitchPath(await fs.promises.realpath(file))) {
	console.warn(`${binName} is already installed in ${file} and points to a Yarn Switch install - skipping`);
	return;
	}
	if (currentSymlink !== symlink) {
	await fs.promises.unlink(file);
	} else {
	return;
	}
	}
	await fs.promises.symlink(symlink, file);

fs.existsSync(file) returns false as the file this symlink is pointing to does not exist. This check should be true to remove the broken symlink

[Pnlvfx]

do brew cleanup abd retry

[krombel]

this helps indeed - as does removing the broken links by hand.
The point of this issue is not how to circumvent the issue but to help fixing the underlying cause