ssh-agent-action/index.js

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const core = require('@actions/core');
const child_process = require('child_process');
const fs = require('fs');
const os = require('os');
const crypto = require('crypto');
try {
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const privateKey = core.getInput('ssh-private-key');
if (!privateKey) {
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.");
return;
}
var home;
if (process.env['OS'] == 'Windows_NT') {
console.log('Preparing ssh-agent service on Windows');
child_process.execSync('sc config ssh-agent start=demand', { stdio: 'inherit' });
home = os.homedir();
} else {
// Use getent() system call, since this is what ssh does; makes a difference in Docker-based
// Action runs, where $HOME is different from the pwent
var { homedir: home } = os.userInfo();
}
const homeSsh = home + '/.ssh';
console.log(`Adding GitHub.com keys to ${homeSsh}/known_hosts`);
fs.mkdirSync(homeSsh, { recursive: true });
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==\n');
fs.appendFileSync(`${homeSsh}/known_hosts`, '\ngithub.com ssh-dss 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\n');
console.log("Starting ssh-agent");
const authSock = core.getInput('ssh-auth-sock');
let sshAgentOutput = ''
if (authSock && authSock.length > 0) {
sshAgentOutput = child_process.execFileSync('ssh-agent', ['-a', authSock]);
} else {
sshAgentOutput = child_process.execFileSync('ssh-agent')
}
// Extract auth socket path and agent pid and set them as job variables
const lines = sshAgentOutput.toString().split("\n")
for (const lineNumber in lines) {
const matches = /^(SSH_AUTH_SOCK|SSH_AGENT_PID)=(.*); export \1/.exec(lines[lineNumber])
if (matches && matches.length > 0) {
core.exportVariable(matches[1], matches[2])
}
}
console.log("Adding private key to agent");
privateKey.split(/(?=-----BEGIN)/).forEach(function(key) {
child_process.execSync('ssh-add -', { input: key.trim() + "\n" });
});
console.log("Keys added:");
child_process.execSync('ssh-add -l', { stdio: 'inherit' });
child_process.execFileSync('ssh-add', ['-L']).toString().split(/\r?\n/).forEach(function(key) {
let parts = key.match(/\bgithub.com[:/](.*)(?:\.git)?\b/);
if (parts == null) {
return;
}
let ownerAndRepo = parts[1];
let sha256 = crypto.createHash('sha256').update(key).digest('hex');
fs.writeFileSync(`${homeSsh}/${sha256}`, key + "\n", { mode: '600' });
child_process.execSync(`git config --global --replace-all url."git@${sha256}:${ownerAndRepo}".insteadOf "https://github.com/${ownerAndRepo}"`);
child_process.execSync(`git config --global --add url."git@${sha256}:${ownerAndRepo}".insteadOf "git@github.com:${ownerAndRepo}"`);
child_process.execSync(`git config --global --add url."git@${sha256}:${ownerAndRepo}".insteadOf "ssh://git@github.com/${ownerAndRepo}"`);
let sshConfig = `\nHost ${sha256}\n`
+ ` HostName github.com\n`
+ ` User git\n`
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+ ` IdentityFile ${homeSsh}/${sha256}\n`;
fs.appendFileSync(`${homeSsh}/config`, sshConfig);
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console.log(`Added deploy-key mapping: Use key "${key}" for GitHub repository ${ownerAndRepo}, key file "${sha256}"`);
});
} catch (error) {
core.setFailed(error.message);
}