Function findExistingInstall

apps/desktop/src/main/cli-install.ts:236–263

(
  wrapper: WrapperLocation | null
)

}

async function findExistingInstall(
  wrapper: WrapperLocation | null
): Promise<ExistingInstall | null> {
  for (const dir of candidateDirs()) {
    const candidate = path.join(dir, CLI_NAME)
    try {
      const linkTarget = await fsp.readlink(candidate)
      const resolved = path.isAbsolute(linkTarget)
        ? linkTarget
        : path.resolve(dir, linkTarget)
      const byUs = wrapper ? sameFile(resolved, wrapper.wrapperPath) : looksLikeOurInstall(resolved)
      return { linkPath: candidate, installedByThisApp: byUs }
    } catch (err) {
      if ((err as NodeJS.ErrnoException).code === 'EINVAL') {
        // Real file, not a symlink. Treat as a foreign install we
        // refuse to manage.
        try {
          await fsp.access(candidate)
          return { linkPath: candidate, installedByThisApp: false }
        } catch {
          /* fall through */
        }
      }
      // ENOENT or permission errors — keep searching.
    }
  }
  return null
}

function sameFile(a: string, b: string): boolean {
  try {