Function findWindowsBash

src/node/utils/main/bashPath.ts:109–195

* Find bash executable path on Windows. * * We strongly prefer Git Bash (Git for Windows) and explicitly avoid WSL launchers.

(params: FindWindowsBashParams)

 * We strongly prefer Git Bash (Git for Windows) and explicitly avoid WSL launchers.
 */
function findWindowsBash(params: FindWindowsBashParams): string | null {
  const { env, execSyncFn, existsSyncFn } = params;

  const gitRoots: string[] = [
    // Git for Windows default paths
    "C:\\Program Files\\Git",
    "C:\\Program Files (x86)\\Git",
    // Chocolatey installation
    "C:\\tools\\git",
  ];

  // User-local Git installation
  if (env.LOCALAPPDATA) {
    gitRoots.push(WIN_PATH.join(env.LOCALAPPDATA, "Programs", "Git"));
  }

  // Scoop installation
  if (env.USERPROFILE) {
    gitRoots.push(WIN_PATH.join(env.USERPROFILE, "scoop", "apps", "git", "current"));
  }

  // Prefer known Git for Windows install locations.
  const commonPaths = gitRoots.flatMap((root) => [
    WIN_PATH.join(root, "bin", "bash.exe"),
    WIN_PATH.join(root, "usr", "bin", "bash.exe"),
  ]);

  for (const bashPath of commonPaths) {
    if (existsSyncFn(bashPath) && looksLikeGitForWindowsBash(bashPath, existsSyncFn)) {
      return bashPath;
    }
  }

  // Also check if Git is in PATH and derive bash path from it.
  try {
    const result = execSyncFn("where git", {
      encoding: "utf8",
      stdio: ["pipe", "pipe", "ignore"],
      windowsHide: true,
    });
    for (const gitExePath of parseWhereOutput(result)) {
      if (!existsSyncFn(gitExePath)) {
        continue;
      }

      const gitRoot = findGitRootFromGitExePath(gitExePath, existsSyncFn);
      if (!gitRoot) {
        continue;
      }

      const candidateBashPaths = [
        WIN_PATH.join(gitRoot, "bin", "bash.exe"),
        WIN_PATH.join(gitRoot, "usr", "bin", "bash.exe"),
      ];

      for (const bashPath of candidateBashPaths) {
        if (existsSyncFn(bashPath) && looksLikeGitForWindowsBash(bashPath, existsSyncFn)) {
          return bashPath;