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🐛 Relocate MCP run directory out of the npm-managed install directory

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For the npm MCP package, adjust the launcher to specifically prepare
the runtime directory: The package contents are copied once per version
to a runtime directory owned by the launcher.

The npm-owned package directory cannot be used. While installing there
worked for older npm/npx version, we have to assume it is read-only.

Fixes #9947
This commit is contained in:
Dominik Jain 2026-07-06 16:00:53 +00:00 committed by Alonso Torres
parent aee555ff6e
commit 93b5baa9fc
1 changed files with 45 additions and 5 deletions
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50
mcp/bin/mcp-local.js
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@ -1,21 +1,61 @@
#!/usr/bin/env node
// Entry point (bin) of the published @penpot/mcp package.
// This script is not intended to be run from a source checkout; there, use
// `pnpm run bootstrap` directly, as described in the README.
const { execSync } = require("child_process");
const fs = require("fs");
const os = require("os");
const path = require("path");
const root = path.resolve(__dirname, "..");
const pkg = require(path.join(root, "package.json"));
const packageRoot = path.resolve(__dirname, "..");
const pkg = require(path.join(packageRoot, "package.json"));
function pnpmVersion() {
const match = (pkg.packageManager || "").match(/^pnpm@([^+]+)/);
return match ? match[1] : "latest";
}
function run(command) {
execSync(command, { cwd: root, stdio: "inherit" });
/**
* Prepares the directory in which to bootstrap and run.
*
* The package contents are copied once per version to a runtime directory
* owned by this launcher. The npm-owned package directory cannot be used;
* we have to assume it is read-only (#9947).
*
* @returns {string} the directory to run the bootstrap in
*/
function prepareRuntimeRoot() {
const cacheBase = process.env.XDG_CACHE_HOME || path.join(os.homedir(), ".cache");
const runtimeRoot = path.join(cacheBase, "penpot-mcp", pkg.version);
if (fs.existsSync(runtimeRoot)) {
return runtimeRoot;
}
// copy to a temporary sibling first and rename, so an interrupted copy
// cannot leave a partial runtime directory behind
console.log(`Preparing runtime directory ${runtimeRoot} ...`);
const tempRoot = `${runtimeRoot}.tmp-${process.pid}`;
fs.rmSync(tempRoot, { recursive: true, force: true });
fs.cpSync(packageRoot, tempRoot, {
recursive: true,
filter: (src) => path.basename(src) !== "node_modules",
});
try {
fs.renameSync(tempRoot, runtimeRoot);
} catch (error) {
fs.rmSync(tempRoot, { recursive: true, force: true });
if (!fs.existsSync(runtimeRoot)) {
throw error;
}
// a concurrent launch created the runtime directory in the meantime; use it
}
return runtimeRoot;
}
const root = prepareRuntimeRoot();
// pnpm-lock.yaml is hard-excluded by npm pack; it is shipped as pnpm-lock.dist.yaml
// and restored here before bootstrap runs.
const distLock = path.join(root, "pnpm-lock.dist.yaml");
@ -25,7 +65,7 @@ if (fs.existsSync(distLock)) {
}
try {
run(`npx -y pnpm@${pnpmVersion()} run bootstrap`);
execSync(`npx -y pnpm@${pnpmVersion()} run bootstrap`, { cwd: root, stdio: "inherit" });
} catch (error) {
process.exit(error.status ?? 1);
}