`brew install` of arduino-cli leads to `discovery builtin:mdns-discovery not found` error

[aliphys]

Describe the problem

Upon installing the arduino-cli via brew, an Error initializing instance: Error loading hardware platform: discovery builtin:mdns-discovery not found error is displayed when the arduino-cli core list command is entered into the terminal.

To reproduce

1. Install brew and gccfrom the terminal

sudo apt install curl

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"~

(echo; echo 'eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"') >> /home/ali/.profile
eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"

sudo apt-get install build-essential
brew install gcc

2. Install arduino-cli

brew update
brew install arduino-cli

3. Run command arduino-cli core list

$ arduino-cli core list
Error initializing instance: Error loading hardware platform: discovery builtin:mdns-discovery not found
Error initializing instance: Error loading hardware platform: discovery builtin:mdns-discovery not found
Error initializing instance: Error loading hardware platform: discovery builtin:mdns-discovery not found
Error initializing instance: Error loading hardware platform: discovery builtin:mdns-discovery not found
ID                Installed Latest Name                                        
arduino:avr       1.8.3     1.8.3  Arduino AVR Boards                          
arduino:mbed_nano 2.0.0     2.0.0  Arduino Mbed OS Nano Boards                 
arduino:samd      1.8.11    1.8.11 Arduino SAMD Boards (32-bits ARM Cortex-M0+)

Expected behavior

$ arduino-cli core list
ID                Installed Latest Name                                        
arduino:avr       1.8.3     1.8.6  Arduino AVR Boards                          
arduino:mbed_nano 2.0.0     4.0.2  Arduino Mbed OS Nano Boards                 
arduino:samd      1.8.11    1.8.13 Arduino SAMD Boards (32-bits ARM Cortex-M0+)

Arduino CLI version

arduino-cli Version: 0.32.1 Commit: a8787b8 Date: 2023-04-07T13:55:06Z

Operating system

Linux

Operating system version

Ubuntu 22.04

Additional context

It is possible to solve this by running the arduino-cli core update-index command as mentioned by a Forum user here. Then, the next time arduino-cli core list is run, the required tools are installed.

Ideally this should not be required and this step should happen without user intervention.

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details

[sminogue]

This also happened to me when running arduino-cli board list after installation. The "workaround" above solved the problem.

I would recommend adding the command arduino-cli core update-index to the brew installation.

[umbynos]

@aliphys does this happens also with the latest version of the cli?

[aliphys]

I've installed the cli several times since I made this bug report. Haven't had this issue reoccur.

I guess we can close this issue. 🙂