Implement the run feature

lib/generate-environment.js

@@ -0,0 +1,37 @@
+"use strict";
+
+// const nijs = require("nijs");
+const path = require("path");
+
+function nixEscapeString(string) {
+	return string
+		.replace(/\\/g, "\\\\")
+		.replace(/"/g, "\\\"");
+}
+
+module.exports = function generateEnvironment({ targetBinary, packages, binaryName }) {	
+	// return nijs.jsToNix("foo", true);
+
+	// return nijs.jsToNix(function (args) {
+	// 	return args.pkgs().buildFHSUserEnv({
+	// 		name: path.basename(targetBinary)
+	// 	});
+	// }, true);
+
+	return `
+		{ pkgs ? import <nixpkgs> {} }:
+		pkgs.buildFHSUserEnv {
+			name = "${nixEscapeString(binaryName)}";
+			
+			targetPkgs = pkgs: with pkgs; [
+				${packages.join(" ")}
+			];
+			
+			runScript = pkgs.writeScript "run-${nixEscapeString(binaryName)}" ''
+				cmd="$1"
+				shift
+				exec -- "${nixEscapeString(targetBinary)}" "$@"
+			'';
+		}
+	`;
+};

lib/nix-build.js

@@ -0,0 +1,22 @@
+"use strict";
+
+const Promise = require("bluebird");
+const nanoid = require("nanoid");
+
+const runProgram = require("./run-program");
+
+module.exports = function nixBuild(file) {
+	return Promise.try(() => {
+		let outLink = `/tmp/depfish-build-${nanoid()}`;
+		
+		return Promise.try(() => {
+			return runProgram("nix", [
+				"build",
+				"--file", file,
+				"--out-link", outLink
+			]);
+		}).then(() => {
+			return outLink;
+		});
+	});
+};

lib/run-program.js

@@ -0,0 +1,28 @@
+"use strict";
+
+const Promise = require("bluebird");
+const childProcess = require("child_process");
+
+module.exports = function runProgram(binary, args = [], options = {}) {
+	return new Promise((resolve, reject) => {
+		let proc = childProcess.spawn(binary, args, Object.assign({
+			stdio: [ process.stdin, process.stdout, process.stderr ]
+		}, options));
+
+		proc.on("error", (error) => {
+			reject(error);
+		});
+
+		proc.on("exit", (exitCode, signal) => {
+			if (exitCode === 0) {
+				resolve();
+			} else if (exitCode != null) {
+				reject(`Non-zero exit code: ${exitCode}`);
+			} else if (signal != null) {
+				reject(`Process terminated by signal: ${signal}`);
+			} else {
+				reject("Process exited abnormally");
+			}
+		});
+	});
+};

locate.js

@@ -5,9 +5,14 @@ const path = require("path");
 const chalk = require("chalk");
 const pad = require("pad");
 const yargs = require("yargs");
+const nanoid = require("nanoid");
+const fs = Promise.promisifyAll(require("fs"));
 
 const ldd = require("./lib/ldd");
 const findPackages = require("./lib/find-packages");
+const generateEnvironment = require("./lib/generate-environment");
+const nixBuild = require("./lib/nix-build");
+const runProgram = require("./lib/run-program");
 
 let argv = yargs
 	.boolean("run")
@@ -68,6 +73,25 @@ Promise.try(() => {
 	if (argv.run) {
 		console.log(chalk.cyan(`Preparing to run ${chalk.bold(binaryName)}...`));
 		
-		/* TODO */
+		let buildExpression = generateEnvironment({
+			binaryName: binaryName,
+			targetBinary: target,
+			packages: Object.keys(groupedPackages)
+				.concat([ "systemd" ]) /* Hack for libudev SIGTRAP issue; this may need to be detected interactively in the future */
+		});
+
+		let expressionPath = `/tmp/depfish-expr-${nanoid()}`;
+
+		return Promise.try(() => {
+			return fs.writeFileAsync(expressionPath, buildExpression);
+		}).then(() => {
+			console.log("Expression path:", expressionPath);
+			
+			return nixBuild(expressionPath);
+		}).then((outPath) => {
+			console.log("Build path:", outPath);
+
+			return runProgram(`${outPath}/bin/${binaryName}`);
+		});
 	}
 });

package.json

@@ -11,6 +11,8 @@
     "escape-string-regexp": "^2.0.0",
     "js-lcs": "^1.0.1",
     "map-obj": "^4.1.0",
+    "nanoid": "^2.0.3",
+    "nijs": "^0.0.25",
     "pad": "^3.2.0",
     "yargs": "^13.2.4"
   }

yarn.lock

@@ -207,11 +207,24 @@ mimic-fn@^2.0.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-2.1.0.tgz#7ed2c2ccccaf84d3ffcb7a69b57711fc2083401b"
   integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
 
+nanoid@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-2.0.3.tgz#dde999e173bc9d7bd2ee2746b89909ade98e075e"
+  integrity sha512-NbaoqdhIYmY6FXDRB4eYtDVC9Z9eCbn8TyaiC16LNKtpPv/aqa0tOPD8y6gNE4yUNnaZ7LLhYtXOev/6+cBtfw==
+
 nice-try@^1.0.4:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
   integrity sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==
 
+nijs@^0.0.25:
+  version "0.0.25"
+  resolved "https://registry.yarnpkg.com/nijs/-/nijs-0.0.25.tgz#04b035cb530d46859d1018839a518c029133f676"
+  integrity sha1-BLA1y1MNRoWdEBiDmlGMApEz9nY=
+  dependencies:
+    optparse ">= 1.0.3"
+    slasp "0.0.4"
+
 npm-run-path@^2.0.0:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
@@ -226,6 +239,11 @@ once@^1.3.1, once@^1.4.0:
   dependencies:
     wrappy "1"
 
+"optparse@>= 1.0.3":
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/optparse/-/optparse-1.0.5.tgz#75e75a96506611eb1c65ba89018ff08a981e2c16"
+  integrity sha1-dedallBmEescZbqJAY/wipgeLBY=
+
 os-locale@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-3.1.0.tgz#a802a6ee17f24c10483ab9935719cef4ed16bf1a"
@@ -331,6 +349,11 @@ signal-exit@^3.0.0:
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
   integrity sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=
 
+slasp@0.0.4:
+  version "0.0.4"
+  resolved "https://registry.yarnpkg.com/slasp/-/slasp-0.0.4.tgz#9adc26ee729a0f95095851a5489f87a5258d57a9"
+  integrity sha1-mtwm7nKaD5UJWFGlSJ+HpSWNV6k=
+
 string-width@^3.0.0, string-width@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/string-width/-/string-width-3.1.0.tgz#22767be21b62af1081574306f69ac51b62203961"