Randomize SSH auth socket, kill agent to support non-ephemeral, self hosted runners (@thommyhh, #27)
Thanks to @thommyhh for this contribution! Unless the `SSH_AUTH_SOCK` is configured explicitly, this change will make the SSH agent use a random file name for the socket. That way, multiple, concurrent SSH agents can be used on non-ephemeral, self-hosted runners. A new post-action step will automatically clean up the running agent at the end of a job. Be aware of the possible security implications: Two jobs running on the same runner might be able to access each other's socket and thus access repositories and/or hosts.
This commit is contained in:
Thorben Nissen
GitHub
parent
a82ae3cd1a
commit
4fcb25e7ef
9 changed files with 424 additions and 20 deletions
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@ -57,6 +57,11 @@ The `ssh-agent` will load all of the keys and try each one in order when establi
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There's one **caveat**, though: SSH servers may abort the connection attempt after a number of mismatching keys have been presented. So if, for example, you have
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six different keys loaded into the `ssh-agent`, but the server aborts after five unknown keys, the last key (which might be the right one) will never even be tried.
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## Exported variables
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The action exports `SSH_AUTH_SOCK` and `SSH_AGENT_PID` through the Github Actions core module.
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The `$SSH_AUTH_SOCK` is used by several applications like git or rsync to connect to the SSH authentication agent.
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The `$SSH_AGENT_PID` contains the process id of the agent. This is used to kill the agent in post job action.
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## Known issues and limitations
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### Currently OS X and Linux only
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@ -116,7 +121,7 @@ As a note to my future self, in order to work on this repo:
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* Run `npm install` to fetch dependencies
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* _hack hack hack_
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* `node index.js`. Inputs are passed through `INPUT_` env vars with their names uppercased. Use `env "INPUT_SSH-PRIVATE-KEY=\`cat file\`" node index.js` for this action.
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* Run `./node_modules/.bin/ncc build index.js` to update `dist/index.js`, which is the file actually run
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* Run `npm run build` to update `dist/*`, which holds the files actually run
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* Read https://help.github.com/en/articles/creating-a-javascript-action if unsure.
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* Maybe update the README example when publishing a new version.
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@ -6,10 +6,10 @@ inputs:
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required: true
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ssh-auth-sock:
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description: 'Where to place the SSH Agent auth socket'
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default: /tmp/ssh-auth.sock
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runs:
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using: 'node12'
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main: 'dist/index.js'
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post: 'dist/cleanup.js'
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branding:
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icon: loader
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color: 'yellow'
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10
cleanup.js
Normal file
10
cleanup.js
Normal file
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@ -0,0 +1,10 @@
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const core = require('@actions/core')
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const { execSync } = require('child_process')
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try {
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// Kill the started SSH agent
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console.log('Stopping SSH agent')
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execSync('kill ${SSH_AGENT_PID}', { stdio: 'inherit' })
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} catch (error) {
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core.setFailed(error.message)
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}
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332
dist/cleanup.js
vendored
Normal file
332
dist/cleanup.js
vendored
Normal file
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@ -0,0 +1,332 @@
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module.exports =
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/******/ (function(modules, runtime) { // webpackBootstrap
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/******/ "use strict";
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/******/ // The module cache
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/******/ var installedModules = {};
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/******/
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/******/ // The require function
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/******/ function __webpack_require__(moduleId) {
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/******/
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/******/ // Check if module is in cache
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/******/ if(installedModules[moduleId]) {
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/******/ return installedModules[moduleId].exports;
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/******/ }
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/******/ // Create a new module (and put it into the cache)
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/******/ var module = installedModules[moduleId] = {
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/******/ i: moduleId,
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/******/ l: false,
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/******/ exports: {}
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/******/ };
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/******/
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/******/ // Execute the module function
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/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
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/******/
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/******/ // Flag the module as loaded
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/******/ module.l = true;
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/******/
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/******/ // Return the exports of the module
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/******/ return module.exports;
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/******/ }
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/******/
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/******/
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/******/ __webpack_require__.ab = __dirname + "/";
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/******/
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/******/ // the startup function
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/******/ function startup() {
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/******/ // Load entry module and return exports
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/******/ return __webpack_require__(175);
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/******/ };
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/******/
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/******/ // run startup
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/******/ return startup();
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/******/ })
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/************************************************************************/
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/******/ ({
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/***/ 87:
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/***/ (function(module) {
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module.exports = require("os");
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/***/ }),
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/***/ 129:
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/***/ (function(module) {
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module.exports = require("child_process");
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/***/ }),
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/***/ 175:
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/***/ (function(__unusedmodule, __unusedexports, __webpack_require__) {
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const core = __webpack_require__(470)
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const { execSync } = __webpack_require__(129)
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try {
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// Kill the started SSH agent
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console.log('Stopping SSH agent')
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execSync('kill ${SSH_AGENT_PID}', { stdio: 'inherit' })
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} catch (error) {
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core.setFailed(error.message)
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}
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/***/ }),
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/***/ 431:
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/***/ (function(__unusedmodule, exports, __webpack_require__) {
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const os = __webpack_require__(87);
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/**
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* Commands
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*
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* Command Format:
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* ##[name key=value;key=value]message
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*
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* Examples:
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* ##[warning]This is the user warning message
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* ##[set-secret name=mypassword]definitelyNotAPassword!
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*/
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function issueCommand(command, properties, message) {
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const cmd = new Command(command, properties, message);
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process.stdout.write(cmd.toString() + os.EOL);
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}
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exports.issueCommand = issueCommand;
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function issue(name, message = '') {
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issueCommand(name, {}, message);
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}
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exports.issue = issue;
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const CMD_PREFIX = '##[';
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class Command {
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constructor(command, properties, message) {
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if (!command) {
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command = 'missing.command';
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}
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this.command = command;
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this.properties = properties;
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this.message = message;
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}
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toString() {
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let cmdStr = CMD_PREFIX + this.command;
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if (this.properties && Object.keys(this.properties).length > 0) {
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cmdStr += ' ';
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for (const key in this.properties) {
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if (this.properties.hasOwnProperty(key)) {
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const val = this.properties[key];
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if (val) {
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// safely append the val - avoid blowing up when attempting to
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// call .replace() if message is not a string for some reason
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cmdStr += `${key}=${escape(`${val || ''}`)};`;
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}
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}
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}
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}
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cmdStr += ']';
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// safely append the message - avoid blowing up when attempting to
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// call .replace() if message is not a string for some reason
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const message = `${this.message || ''}`;
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cmdStr += escapeData(message);
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return cmdStr;
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}
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}
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function escapeData(s) {
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return s.replace(/\r/g, '%0D').replace(/\n/g, '%0A');
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}
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function escape(s) {
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return s
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.replace(/\r/g, '%0D')
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.replace(/\n/g, '%0A')
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.replace(/]/g, '%5D')
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.replace(/;/g, '%3B');
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}
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//# sourceMappingURL=command.js.map
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/***/ }),
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/***/ 470:
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/***/ (function(__unusedmodule, exports, __webpack_require__) {
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"use strict";
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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const command_1 = __webpack_require__(431);
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const path = __webpack_require__(622);
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/**
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* The code to exit an action
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*/
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var ExitCode;
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(function (ExitCode) {
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/**
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* A code indicating that the action was successful
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*/
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ExitCode[ExitCode["Success"] = 0] = "Success";
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/**
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* A code indicating that the action was a failure
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*/
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ExitCode[ExitCode["Failure"] = 1] = "Failure";
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})(ExitCode = exports.ExitCode || (exports.ExitCode = {}));
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//-----------------------------------------------------------------------
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// Variables
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//-----------------------------------------------------------------------
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/**
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* sets env variable for this action and future actions in the job
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* @param name the name of the variable to set
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* @param val the value of the variable
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*/
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function exportVariable(name, val) {
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process.env[name] = val;
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command_1.issueCommand('set-env', { name }, val);
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}
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exports.exportVariable = exportVariable;
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/**
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* exports the variable and registers a secret which will get masked from logs
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* @param name the name of the variable to set
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* @param val value of the secret
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*/
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function exportSecret(name, val) {
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exportVariable(name, val);
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// the runner will error with not implemented
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// leaving the function but raising the error earlier
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command_1.issueCommand('set-secret', {}, val);
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throw new Error('Not implemented.');
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}
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exports.exportSecret = exportSecret;
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/**
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* Prepends inputPath to the PATH (for this action and future actions)
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* @param inputPath
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*/
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function addPath(inputPath) {
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command_1.issueCommand('add-path', {}, inputPath);
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process.env['PATH'] = `${inputPath}${path.delimiter}${process.env['PATH']}`;
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}
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exports.addPath = addPath;
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/**
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* Gets the value of an input. The value is also trimmed.
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*
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* @param name name of the input to get
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* @param options optional. See InputOptions.
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* @returns string
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*/
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function getInput(name, options) {
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const val = process.env[`INPUT_${name.replace(' ', '_').toUpperCase()}`] || '';
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if (options && options.required && !val) {
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throw new Error(`Input required and not supplied: ${name}`);
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}
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return val.trim();
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}
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exports.getInput = getInput;
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/**
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* Sets the value of an output.
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*
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* @param name name of the output to set
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* @param value value to store
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*/
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function setOutput(name, value) {
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command_1.issueCommand('set-output', { name }, value);
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}
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exports.setOutput = setOutput;
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//-----------------------------------------------------------------------
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// Results
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//-----------------------------------------------------------------------
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/**
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* Sets the action status to failed.
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* When the action exits it will be with an exit code of 1
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* @param message add error issue message
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*/
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function setFailed(message) {
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process.exitCode = ExitCode.Failure;
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error(message);
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}
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exports.setFailed = setFailed;
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//-----------------------------------------------------------------------
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// Logging Commands
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//-----------------------------------------------------------------------
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/**
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* Writes debug message to user log
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* @param message debug message
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*/
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function debug(message) {
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command_1.issueCommand('debug', {}, message);
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}
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exports.debug = debug;
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/**
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* Adds an error issue
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* @param message error issue message
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*/
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function error(message) {
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command_1.issue('error', message);
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}
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exports.error = error;
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/**
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* Adds an warning issue
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* @param message warning issue message
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*/
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function warning(message) {
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command_1.issue('warning', message);
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}
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exports.warning = warning;
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/**
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* Begin an output group.
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*
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* Output until the next `groupEnd` will be foldable in this group
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*
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* @param name The name of the output group
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*/
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function startGroup(name) {
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command_1.issue('group', name);
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}
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exports.startGroup = startGroup;
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/**
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* End an output group.
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*/
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function endGroup() {
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command_1.issue('endgroup');
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}
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exports.endGroup = endGroup;
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/**
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* Wrap an asynchronous function call in a group.
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*
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* Returns the same type as the function itself.
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*
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* @param name The name of the group
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* @param fn The function to wrap in the group
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*/
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function group(name, fn) {
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return __awaiter(this, void 0, void 0, function* () {
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startGroup(name);
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let result;
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try {
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result = yield fn();
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}
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finally {
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endGroup();
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}
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return result;
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});
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}
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exports.group = group;
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//# sourceMappingURL=core.js.map
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/***/ }),
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/***/ 622:
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/***/ (function(module) {
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module.exports = require("path");
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/***/ })
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/******/ });
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21
dist/index.js
vendored
21
dist/index.js
vendored
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@ -62,7 +62,7 @@ try {
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const home = process.env['HOME'];
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const homeSsh = home + '/.ssh';
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const privateKey = core.getInput('ssh-private-key').trim();
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const privateKey = core.getInput('ssh-private-key');
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if (!privateKey) {
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core.setFailed("The ssh-private-key argument is empty. Maybe the secret has not been configured, or you are using a wrong secret name in your workflow file.");
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@ -71,14 +71,27 @@ try {
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}
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console.log(`Adding GitHub.com keys to ${homeSsh}/known_hosts`);
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fs.mkdirSync(homeSsh, { recursive: true});
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fs.mkdirSync(homeSsh, { recursive: true });
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fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==\n');
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fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-dss 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\n');
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console.log("Starting ssh-agent");
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const authSock = core.getInput('ssh-auth-sock');
|
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child_process.execFileSync('ssh-agent', ['-a', authSock]);
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core.exportVariable('SSH_AUTH_SOCK', authSock);
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let sshAgentOutput = ''
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if (authSock && authSock.length > 0) {
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sshAgentOutput = child_process.execFileSync('ssh-agent', ['-a', authSock]);
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} else {
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sshAgentOutput = child_process.execFileSync('ssh-agent')
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}
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// Extract auth socket path and agent pid and set them as job variables
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const lines = sshAgentOutput.toString().split("\n")
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for (const lineNumber in lines) {
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const matches = /^(SSH_AUTH_SOCK|SSH_AGENT_PID)=(.*); export \1/.exec(lines[lineNumber])
|
||||
if (matches && matches.length > 0) {
|
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core.exportVariable(matches[1], matches[2])
|
||||
}
|
||||
}
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||||
console.log("Adding private key to agent");
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||||
privateKey.split(/(?=-----BEGIN)/).forEach(function(key) {
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|
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17
index.js
17
index.js
|
|
@ -22,8 +22,21 @@ try {
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console.log("Starting ssh-agent");
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const authSock = core.getInput('ssh-auth-sock');
|
||||
child_process.execFileSync('ssh-agent', ['-a', authSock]);
|
||||
core.exportVariable('SSH_AUTH_SOCK', authSock);
|
||||
let sshAgentOutput = ''
|
||||
if (authSock && authSock.length > 0) {
|
||||
sshAgentOutput = child_process.execFileSync('ssh-agent', ['-a', authSock]);
|
||||
} else {
|
||||
sshAgentOutput = child_process.execFileSync('ssh-agent')
|
||||
}
|
||||
|
||||
// Extract auth socket path and agent pid and set them as job variables
|
||||
const lines = sshAgentOutput.toString().split("\n")
|
||||
for (const lineNumber in lines) {
|
||||
const matches = /^(SSH_AUTH_SOCK|SSH_AGENT_PID)=(.*); export \1/.exec(lines[lineNumber])
|
||||
if (matches && matches.length > 0) {
|
||||
core.exportVariable(matches[1], matches[2])
|
||||
}
|
||||
}
|
||||
|
||||
console.log("Adding private key to agent");
|
||||
privateKey.split(/(?=-----BEGIN)/).forEach(function(key) {
|
||||
|
|
|
|||
12
package-lock.json
generated
12
package-lock.json
generated
|
|
@ -5,9 +5,9 @@
|
|||
"requires": true,
|
||||
"dependencies": {
|
||||
"@actions/core": {
|
||||
"version": "1.1.0",
|
||||
"resolved": "https://registry.npmjs.org/@actions/core/-/core-1.1.0.tgz",
|
||||
"integrity": "sha512-KKpo3xzo0Zsikni9tbOsEQkxZBGDsYSJZNkTvmo0gPSXrc98TBOcdTvKwwjitjkjHkreTggWdB1ACiAFVgsuzA==",
|
||||
"version": "1.2.4",
|
||||
"resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.4.tgz",
|
||||
"integrity": "sha512-YJCEq8BE3CdN8+7HPZ/4DxJjk/OkZV2FFIf+DlZTC/4iBlzYCD5yjRR6eiOS5llO11zbRltIRuKAjMKaWTE6cg==",
|
||||
"dev": true
|
||||
},
|
||||
"@zeit/ncc": {
|
||||
|
|
@ -15,12 +15,6 @@
|
|||
"resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.20.5.tgz",
|
||||
"integrity": "sha512-XU6uzwvv95DqxciQx+aOLhbyBx/13ky+RK1y88Age9Du3BlA4mMPCy13BGjayOrrumOzlq1XV3SD/BWiZENXlw==",
|
||||
"dev": true
|
||||
},
|
||||
"child_process": {
|
||||
"version": "1.0.2",
|
||||
"resolved": "https://registry.npmjs.org/child_process/-/child_process-1.0.2.tgz",
|
||||
"integrity": "sha1-sffn/HPSXn/R1FWtyU4UODAYK1o=",
|
||||
"dev": true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -7,8 +7,10 @@
|
|||
"author": "webfactory GmbH <info@webfactory.de>",
|
||||
"license": "MIT",
|
||||
"devDependencies": {
|
||||
"@actions/core": "^1.1.0",
|
||||
"@zeit/ncc": "^0.20.5",
|
||||
"child_process": "^1.0.2"
|
||||
"@actions/core": "^1.2.4",
|
||||
"@zeit/ncc": "^0.20.5"
|
||||
},
|
||||
"scripts": {
|
||||
"build": "node scripts/build.js"
|
||||
}
|
||||
}
|
||||
|
|
|
|||
35
scripts/build.js
Normal file
35
scripts/build.js
Normal file
|
|
@ -0,0 +1,35 @@
|
|||
const { execSync } = require('child_process')
|
||||
const path = require('path')
|
||||
const fs = require('fs')
|
||||
|
||||
const buildDir = path.join(process.cwd(), 'build')
|
||||
const distDir = path.join(process.cwd(), 'dist')
|
||||
|
||||
const buildIndexJs = path.join(buildDir, 'index.js')
|
||||
const distIndexJs = path.join(distDir, 'index.js')
|
||||
const distCleanupJs = path.join(distDir, 'cleanup.js')
|
||||
|
||||
if (!fs.existsSync(buildDir)) {
|
||||
fs.mkdirSync(buildDir)
|
||||
}
|
||||
|
||||
// Build the main index.js file
|
||||
console.log('Building index.js...')
|
||||
execSync(`./node_modules/.bin/ncc build index.js -q -o ${buildDir}`)
|
||||
if (fs.existsSync(distIndexJs)) {
|
||||
fs.unlinkSync(distIndexJs)
|
||||
}
|
||||
fs.renameSync(buildIndexJs, distIndexJs)
|
||||
|
||||
// Build the cleanup.js file
|
||||
console.log('Building cleanup.js...')
|
||||
execSync(`./node_modules/.bin/ncc build cleanup.js -q -o ${buildDir}`)
|
||||
if (fs.existsSync(distCleanupJs)) {
|
||||
fs.unlinkSync(distCleanupJs)
|
||||
}
|
||||
fs.renameSync(buildIndexJs, distCleanupJs)
|
||||
|
||||
console.log('Cleaning up...')
|
||||
fs.rmdirSync(buildDir)
|
||||
|
||||
console.log('Done')
|
||||
Loading…
Reference in a new issue