fix: sync remote ssh targets

src/infra/ssh-config.ts

@@ -0,0 +1,95 @@
+import { spawn } from "node:child_process";
+
+import type { SshParsedTarget } from "./ssh-tunnel.js";
+
+export type SshResolvedConfig = {
+  user?: string;
+  host?: string;
+  port?: number;
+  identityFiles: string[];
+};
+
+function parsePort(value: string | undefined): number | undefined {
+  if (!value) return undefined;
+  const parsed = Number.parseInt(value, 10);
+  if (!Number.isFinite(parsed) || parsed <= 0) return undefined;
+  return parsed;
+}
+
+export function parseSshConfigOutput(output: string): SshResolvedConfig {
+  const result: SshResolvedConfig = { identityFiles: [] };
+  const lines = output.split("\n");
+  for (const raw of lines) {
+    const line = raw.trim();
+    if (!line) continue;
+    const [key, ...rest] = line.split(/\s+/);
+    const value = rest.join(" ").trim();
+    if (!key || !value) continue;
+    switch (key) {
+      case "user":
+        result.user = value;
+        break;
+      case "hostname":
+        result.host = value;
+        break;
+      case "port":
+        result.port = parsePort(value);
+        break;
+      case "identityfile":
+        if (value !== "none") result.identityFiles.push(value);
+        break;
+      default:
+        break;
+    }
+  }
+  return result;
+}
+
+export async function resolveSshConfig(
+  target: SshParsedTarget,
+  opts: { identity?: string; timeoutMs?: number } = {},
+): Promise<SshResolvedConfig | null> {
+  const sshPath = "/usr/bin/ssh";
+  const args = ["-G"];
+  if (target.port > 0 && target.port !== 22) {
+    args.push("-p", String(target.port));
+  }
+  if (opts.identity?.trim()) {
+    args.push("-i", opts.identity.trim());
+  }
+  const userHost = target.user ? `${target.user}@${target.host}` : target.host;
+  args.push(userHost);
+
+  return await new Promise<SshResolvedConfig | null>((resolve) => {
+    const child = spawn(sshPath, args, {
+      stdio: ["ignore", "pipe", "ignore"],
+    });
+    let stdout = "";
+    child.stdout?.setEncoding("utf8");
+    child.stdout?.on("data", (chunk) => {
+      stdout += String(chunk);
+    });
+
+    const timeoutMs = Math.max(200, opts.timeoutMs ?? 800);
+    const timer = setTimeout(() => {
+      try {
+        child.kill("SIGKILL");
+      } finally {
+        resolve(null);
+      }
+    }, timeoutMs);
+
+    child.once("error", () => {
+      clearTimeout(timer);
+      resolve(null);
+    });
+    child.once("exit", (code) => {
+      clearTimeout(timer);
+      if (code !== 0 || !stdout.trim()) {
+        resolve(null);
+        return;
+      }
+      resolve(parseSshConfigOutput(stdout));
+    });
+  });
+}