electron: port mergeShellEnv logic from tauri (#20192)

packages/desktop-electron/src/main/shell-env.ts

@@ -0,0 +1,88 @@
+import { spawnSync } from "node:child_process"
+import { basename } from "node:path"
+
+const SHELL_ENV_TIMEOUT = 5_000
+
+type Probe = { type: "Loaded"; value: Record<string, string> } | { type: "Timeout" } | { type: "Unavailable" }
+
+export function getUserShell() {
+  return process.env.SHELL || "/bin/sh"
+}
+
+export function parseShellEnv(out: Buffer) {
+  const env: Record<string, string> = {}
+  for (const line of out.toString("utf8").split("\0")) {
+    if (!line) continue
+    const ix = line.indexOf("=")
+    if (ix <= 0) continue
+    env[line.slice(0, ix)] = line.slice(ix + 1)
+  }
+  return env
+}
+
+function probeShellEnv(shell: string, mode: "-il" | "-l"): Probe {
+  const out = spawnSync(shell, [mode, "-c", "env -0"], {
+    stdio: ["ignore", "pipe", "ignore"],
+    timeout: SHELL_ENV_TIMEOUT,
+    windowsHide: true,
+  })
+
+  const err = out.error as NodeJS.ErrnoException | undefined
+  if (err) {
+    if (err.code === "ETIMEDOUT") return { type: "Timeout" }
+    console.log(`[cli] Shell env probe failed for ${shell} ${mode}: ${err.message}`)
+    return { type: "Unavailable" }
+  }
+
+  if (out.status !== 0) {
+    console.log(`[cli] Shell env probe exited with non-zero status for ${shell} ${mode}`)
+    return { type: "Unavailable" }
+  }
+
+  const env = parseShellEnv(out.stdout)
+  if (Object.keys(env).length === 0) {
+    console.log(`[cli] Shell env probe returned empty env for ${shell} ${mode}`)
+    return { type: "Unavailable" }
+  }
+
+  return { type: "Loaded", value: env }
+}
+
+export function isNushell(shell: string) {
+  const name = basename(shell).toLowerCase()
+  const raw = shell.toLowerCase()
+  return name === "nu" || name === "nu.exe" || raw.endsWith("\\nu.exe")
+}
+
+export function loadShellEnv(shell: string) {
+  if (isNushell(shell)) {
+    console.log(`[cli] Skipping shell env probe for nushell: ${shell}`)
+    return null
+  }
+
+  const interactive = probeShellEnv(shell, "-il")
+  if (interactive.type === "Loaded") {
+    console.log(`[cli] Loaded shell environment with -il (${Object.keys(interactive.value).length} vars)`)
+    return interactive.value
+  }
+  if (interactive.type === "Timeout") {
+    console.warn(`[cli] Interactive shell env probe timed out: ${shell}`)
+    return null
+  }
+
+  const login = probeShellEnv(shell, "-l")
+  if (login.type === "Loaded") {
+    console.log(`[cli] Loaded shell environment with -l (${Object.keys(login.value).length} vars)`)
+    return login.value
+  }
+
+  console.warn(`[cli] Falling back to app environment: ${shell}`)
+  return null
+}
+
+export function mergeShellEnv(shell: Record<string, string> | null, env: Record<string, string>) {
+  return {
+    ...(shell || {}),
+    ...env,
+  }
+}