main.ts

const core = require('@actions/core');
const github = require('@actions/github');
const exec = require('@actions/exec');
const io = require('@actions/io');
const cp = require('child_process');
const fs = require('fs');
const path = require('path');

async function run() {
  try {

    // Get github context data
    const context = github.context;

    // To be used to get contents of this git ref 
    const owner = context.repo.owner
    const repo = context.repo.repo
    const ref = context.ref

    // get inputs from workflow
    // specFile name
    const configPath = core.getInput('spec_file'); // user input, eg: `foo.spec' or `rpm/foo.spec'
    const basename = path.basename(configPath); // always just `foo.spec`
    const specFile = {
      srcFullPath: `/github/workspace/${configPath}`,
      destFullPath: `/github/home/rpmbuild/SPECS/${basename}`,
    };

    // Read spec file and get values 
    var data = fs.readFileSync(specFile.srcFullPath, 'utf8');
    let name = '';       
    let version = '';

    for (var line of data.split('\n')){
        var lineArray = line.split(/[ ]+/);
        if(lineArray[0].includes('Name')){
            name = name+lineArray[1];
        }
        if(lineArray[0].includes('Version')){
            version = version+lineArray[1];
        }   
    }
    console.log(`name: ${name}`);
    console.log(`version: ${version}`);

    // setup rpm tree
    await exec.exec('rpmdev-setuptree');

    // Copy spec file from path specFile to /github/home/rpmbuild/SPECS/
    await exec.exec(`cp ${specFile.srcFullPath} ${specFile.destFullPath}`);

    // Make the code in /github/workspace/ into a tar.gz, located in /github/home/rpmbuild/SOURCES/
    const oldGitDir = process.env.GIT_DIR;
    process.env.GIT_DIR = '/github/workspace/.git';
    await exec.exec(`git archive --output=/github/home/rpmbuild/SOURCES/${name}-${version}.tar.gz --prefix=${name}-${version}/ HEAD`);
    await exec.exec(`ln -s /github/home/rpmbuild/SOURCES/${name}-${version}.tar.gz /github/home/rpmbuild/SOURCES/${name}.tar.gz`);
    process.env.GIT_DIR = oldGitDir;

    // Copy any *.patch files from the repo root into SOURCES so spec files
    // can reference them via standard Patch0:/Patch1:/... declarations.
    // No-op if the repo has no patch files.
    const workspaceFiles = fs.readdirSync('/github/workspace');
    for (const f of workspaceFiles) {
      if (f.endsWith('.patch')) {
        console.log(`Copying patch file to SOURCES: ${f}`);
        await exec.exec(`cp /github/workspace/${f} /github/home/rpmbuild/SOURCES/`);
      }
    }

    // Installs additional repositories
    const additionalRepos = core.getInput('additional_repos'); // user input, eg: '["centos-release-scl"]'
	if (additionalRepos) {
		const arr = JSON.parse(additionalRepos);
		for (let i = 0; i < arr.length; i++) {
			console.log(`Installing repo': ${arr[i]}`);
    		await exec.exec(`dnf install -y ${arr[i]}`);
		};
	}

	// Installs build dependencies
    await exec.exec(`dnf builddep -y ${specFile.destFullPath}`);

    // Execute rpmbuild , -ba generates both RPMS and SPRMS
    try {
      await exec.exec(
        `rpmbuild -ba ${specFile.destFullPath}`
      );
    } catch (err) {
      core.setFailed(`action failed with error: ${err}`);
    }

    // Verify RPM is created
    await exec.exec('ls /github/home/rpmbuild/RPMS');

    // setOutput rpm_path to /root/rpmbuild/RPMS , to be consumed by other actions like 
    // actions/upload-release-asset 

    // Get source rpm name , to provide file name, path as output
    let myOutput = '';
    await cp.exec('ls /github/home/rpmbuild/SRPMS/', (err, stdout, stderr) => {
      if (err) {
        //some err occurred
        console.error(err)
      } else {
          // the *entire* stdout and stderr (buffered)
          console.log(`stdout: ${stdout}`);
          myOutput = myOutput+`${stdout}`.trim();
          console.log(`stderr: ${stderr}`);
        }
      });


    // only contents of workspace can be changed by actions and used by subsequent actions 
    // So copy all generated rpms into workspace , and publish output path relative to workspace (/github/workspace)
    await exec.exec(`mkdir -p rpmbuild/SRPMS`);
    await exec.exec(`mkdir -p rpmbuild/RPMS`);

    await exec.exec(`cp /github/home/rpmbuild/SRPMS/${myOutput} rpmbuild/SRPMS`);
    await cp.exec(`cp -R /github/home/rpmbuild/RPMS/. rpmbuild/RPMS/`);

    await exec.exec(`ls -la rpmbuild/SRPMS`);
    await exec.exec(`ls -la rpmbuild/RPMS`);
    
    // set outputs to path relative to workspace ex ./rpmbuild/
    core.setOutput("source_rpm_dir_path", `rpmbuild/SRPMS/`);              // path to  SRPMS directory
    core.setOutput("source_rpm_path", `rpmbuild/SRPMS/${myOutput}`);       // path to Source RPM file
    core.setOutput("source_rpm_name", `${myOutput}`);                      // name of Source RPM file
    core.setOutput("rpm_dir_path", `rpmbuild/RPMS/`);                      // path to RPMS directory
    core.setOutput("rpm_content_type", "application/octet-stream");        // Content-type for Upload
    


  } catch (error: unknown) {
    if (error instanceof Error) {
      core.setFailed(error.message);
    }
  }
}

run();