Unset and restore extraheader config option

src/git.js

@@ -0,0 +1,93 @@
+const core = require("@actions/core");
+const exec = require("@actions/exec");
+const path = require("path");
+
+function getRepoPath(relativePath) {
+  let githubWorkspacePath = process.env["GITHUB_WORKSPACE"];
+  if (!githubWorkspacePath) {
+    throw new Error("GITHUB_WORKSPACE not defined");
+  }
+  githubWorkspacePath = path.resolve(githubWorkspacePath);
+  core.debug(`githubWorkspacePath: ${githubWorkspacePath}`);
+
+  repoPath = githubWorkspacePath;
+  if (relativePath) repoPath = path.resolve(repoPath, relativePath);
+
+  core.debug(`repoPath: ${repoPath}`);
+  return repoPath;
+}
+
+async function execGit(repoPath, args, ignoreReturnCode = false) {
+  const stdout = [];
+  const options = {
+    cwd: repoPath,
+    ignoreReturnCode: ignoreReturnCode,
+    listeners: {
+      stdout: data => {
+        stdout.push(data.toString());
+      }
+    }
+  };
+
+  var result = {};
+  result.exitCode = await exec.exec("git", args, options);
+  result.stdout = stdout.join("");
+  return result;
+}
+
+async function addConfigOption(repoPath, name, value) {
+  const result = await execGit(
+    repoPath,
+    ["config", "--local", "--add", name, value],
+    true
+  );
+  return result.exitCode === 0;
+}
+
+async function unsetConfigOption(repoPath, name) {
+  const result = await execGit(
+    repoPath,
+    ["config", "--local", "--unset", name],
+    true
+  );
+  return result.exitCode === 0;
+}
+
+async function configOptionExists(repoPath, name) {
+  const result = await execGit(
+    repoPath,
+    ["config", "--local", "--name-only", "--get-regexp", name],
+    true
+  );
+  return result.exitCode === 0;
+}
+
+async function getConfigOption(repoPath, name) {
+  const result = await execGit(
+    repoPath,
+    ["config", "--local", name],
+    true
+  );
+  return result.stdout.trim();
+}
+
+async function getAndUnsetConfigOption(repoPath, name) {
+  if (await configOptionExists(repoPath, name)) {
+    const extraHeaderOptionValue = await getConfigOption(repoPath, name);
+    if (await unsetConfigOption(repoPath, name)) {
+      core.debug(`Unset config option '${name}'`);
+      return extraHeaderOptionValue;
+    }
+  }
+  return null;
+}
+
+module.exports = {
+  getRepoPath,
+  execGit,
+  addConfigOption,
+  unsetConfigOption,
+  configOptionExists,
+  getConfigOption,
+  getAndUnsetConfigOption
+};