[bug] Tauri 2 can't change port number

[cryptoquick]

Describe the bug

Despite specifying both the env var and the port flag, it still tries to open the dev server on port 8080.

TAURI_CLI_PORT=1776 cargo tauri dev --port 1776                                                                                                       3679ms  Wed Aug 28 17:24:21 2024
    Running BeforeDevCommand (`trunk serve`)
2024-08-28T23:24:30.781117Z  INFO 🚀 Starting trunk 0.20.3
2024-08-28T23:24:30.873699Z  INFO 📦 starting build
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s
2024-08-28T23:24:31.471878Z  INFO tool version mismatch (required: 0.2.93, system: 0.2.79)
Browserslist: caniuse-lite is outdated. Please run:
  npx update-browserslist-db@latest
  Why you should do it regularly: https://github.com/browserslist/update-db#readme

Rebuilding...

Done in 260ms.
2024-08-28T23:24:32.301974Z  INFO applying new distribution
2024-08-28T23:24:32.303744Z  INFO ✅ success
2024-08-28T23:24:32.303787Z  INFO 📡 serving static assets at -> /
2024-08-28T23:24:32.304138Z  INFO 📡 server listening at:
2024-08-28T23:24:32.304142Z  INFO     🏠 http://127.0.0.1:8080/
2024-08-28T23:24:32.304144Z  INFO     🏠 http://[::1]:8080/
2024-08-28T23:24:32.304190Z ERROR error from server task error=Address already in use (os error 98)
2024-08-28T23:24:32.304222Z ERROR Address already in use (os error 98)
    Error The "beforeDevCommand" terminated with a non-zero status code.

Reproduction

Should be reproducible with create-tauri-app --rc

Expected behavior

The dev server should accept the provided port number and run on that port.

Full tauri info output

[✔] Environment
    - OS: Garuda Linux Soaring X64
    ✔ webkit2gtk-4.1: 2.44.3
    ✔ rsvg2: 2.58.3
    ✔ rustc: 1.80.1 (3f5fd8dd4 2024-08-06)
    ✔ cargo: 1.80.1 (376290515 2024-07-16)
    ✔ rustup: 1.27.1 (2024-05-07)
    ✔ Rust toolchain: stable-x86_64-unknown-linux-gnu (environment override by RUSTUP_TOOLCHAIN)
    - node: 22.7.0
    - yarn: 1.22.22
    - npm: 10.8.2

[-] Packages
    - tauri [RUST]: 2.0.0-rc.5
    - tauri-build [RUST]: 2.0.0-rc.5
    - wry [RUST]: 0.42.0
    - tao [RUST]: 0.29.1
    - tauri-cli [RUST]: 2.0.0-rc.6

[-] App
    - build-type: bundle
    - CSP: unset
    - frontendDist: ../dist
    - devUrl: http://localhost:1777/

Stack trace

N/A

Additional context

N/A

[amrbashir]

--port only affects the built-in devServer (which only works if you don't specify devUrl).

Anyways, you're using trunk to serve your frontend in development, so you'll need to change beforeDevCommand in tauri.conf.json to trunk serve --port=1776, you'll also need to change devUrl to match this new port

[cryptoquick]

That works! Thank you.