1 files changed, 124 insertions, 0 deletions
diff --git a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js
new file mode 100644
index 00000000000..964eaf2555d
--- /dev/null
+++ b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/generateNix.js
@@ -0,0 +1,124 @@
+const R = require('ramda')
+
+const urlToName = require('./urlToName')
+const { execFileSync } = require('child_process')
+
+// fetchgit transforms
+//
+// "shell-quote@git+https://github.com/srghma/node-shell-quote.git#without_unlicenced_jsonify":
+//   version "1.6.0"
+//   resolved "git+https://github.com/srghma/node-shell-quote.git#1234commit"
+//
+// to
+//
+// builtins.fetchGit {
+//   url = "https://github.com/srghma/node-shell-quote.git";
+//   ref = "without_unlicenced_jsonify";
+//   rev = "1234commit";
+// }
+//
+// and transforms
+//
+// "@graphile/plugin-supporter@git+https://1234user:1234pass@git.graphile.com/git/users/1234user/postgraphile-supporter.git":
+//   version "0.6.0"
+//   resolved "git+https://1234user:1234pass@git.graphile.com/git/users/1234user/postgraphile-supporter.git#1234commit"
+//
+// to
+//
+// builtins.fetchGit {
+//   url = "https://1234user:1234pass@git.graphile.com/git/users/1234user/postgraphile-supporter.git";
+//   ref = "master";
+//   rev = "1234commit";
+// }
+
+function prefetchgit(url, rev) {
+  return JSON.parse(
+    execFileSync("nix-prefetch-git", ["--rev", rev, url], {
+      stdio: [ "ignore", "pipe", "ignore" ],
+      timeout: 60000,
+    })
+  ).sha256
+}
+
+function fetchgit(fileName, url, rev, branch, builtinFetchGit) {
+  return `    {
+    name = "${fileName}";
+    path =
+      let${builtinFetchGit ? `
+        repo = builtins.fetchGit {
+          url = "${url}";
+          ref = "${branch}";
+          rev = "${rev}";
+        };
+      ` : `
+        repo = fetchgit {
+          url = "${url}";
+          rev = "${rev}";
+          sha256 = "${prefetchgit(url, rev)}";
+        };
+      `}in
+        runCommandNoCC "${fileName}" { buildInputs = [gnutar]; } ''
+          # Set u+w because tar-fs can't unpack archives with read-only dirs
+          # https://github.com/mafintosh/tar-fs/issues/79
+          tar cf $out --mode u+w -C \${repo} .
+        '';
+  }`
+}
+
+function fetchLockedDep(builtinFetchGit) {
+  return function (pkg) {
+    const { nameWithVersion, resolved } = pkg
+
+    if (!resolved) {
+      console.error(
+        `yarn2nix: can't find "resolved" field for package ${nameWithVersion}, you probably required it using "file:...", this feature is not supported, ignoring`,
+      )
+      return ''
+    }
+
+    const [url, sha1OrRev] = resolved.split('#')
+
+    const fileName = urlToName(url)
+
+    if (url.startsWith('git+')) {
+      const rev = sha1OrRev
+
+      const [_, branch] = nameWithVersion.split('#')
+
+      const urlForGit = url.replace(/^git\+/, '')
+
+      return fetchgit(fileName, urlForGit, rev, branch || 'master', builtinFetchGit)
+    }
+
+    const sha = sha1OrRev
+
+    return `    {
+      name = "${fileName}";
+      path = fetchurl {
+        name = "${fileName}";
+        url  = "${url}";
+        sha1 = "${sha}";
+      };
+    }`
+  }
+}
+
+const HEAD = `
+{ fetchurl, fetchgit, linkFarm, runCommandNoCC, gnutar }: rec {
+  offline_cache = linkFarm "offline" packages;
+  packages = [
+`.trim()
+
+// Object -> String
+function generateNix(pkgs, builtinFetchGit) {
+  const nameWithVersionAndPackageNix = R.map(fetchLockedDep(builtinFetchGit), pkgs)
+
+  const packagesDefinition = R.join(
+    '\n',
+    R.values(nameWithVersionAndPackageNix),
+  )
+
+  return R.join('\n', [HEAD, packagesDefinition, '  ];', '}'])
+}
+
+module.exports = generateNix