Plugin incorrectly assumes that it is running in an environment where a "browser" is available, making enrollment impossible

Beginne mit dem :Copilot-Setup-Einstiegspunkt und reproduziere den Fehler, wenn xdg-open nicht verfügbar ist. Verfolge die Authentifizierungsanfrage, die den Browser öffnet, und vergleiche sie anschließend mit dem im Issue beschriebenen alternativen Geräteablauf. Als erledigt gilt die Aufgabe, wenn das Setup brauchbare Anweisungen bereitstellt, sobald kein Browser-Launcher verfügbar ist, und die Authentifizierung weiterhin abgeschlossen werden kann.

It seems that the GitHub Copilot Vim plug-in was developed with the assumption that it is running in a fully graphical desktop environment where tools such as "a browser" and xdg-open are available, making the use of the plug-in impossible unless these (otherwise not mentioned in the README!) features are satisfied.

System version(s):

❯ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 24.04.3 LTS
Release:        24.04
Codename:       noble

❯ nvim -v
NVIM v0.9.5
Build type: Release
LuaJIT 2.1.1703358377

 77 ──────────────────────────────────────────────────────────────────────────────
 78 vim.lsp: require("vim.lsp.health").check()
 79
 80 - LSP log level : WARN
 81 - Log path: /home/whisperity/.local/state/nvim/lsp.log
 82 - Log size: 4 KB
 83
 84 vim.lsp: Active Clients
 85 - GitHub Copilot (id=1, root_dir=nil)

After installing the plug-in and executing :Copilot setup, the following happens:

Error detected while processing function copilot#Command[33]..function copilot#Command[25]..17[35]..<SNR>174_RequestWait:
line    2:
Error executing vim.schedule lua callback: /usr/share/nvim/runtime/lua/vim/lsp.lua:76: Vim:LSP[GitHub Copilot]: Error SERVER_REQUEST_HANDLER_ERROR: "Vim:E475: Invalid value for argument cmd:
'xdg-open' is not executable"
stack traceback:
        [C]: in function 'nvim_command'
        /usr/share/nvim/runtime/lua/vim/lsp.lua:76: in function 'err_message'
        /usr/share/nvim/runtime/lua/vim/lsp.lua:1086: in function 'cb'
        vim/_editor.lua:263: in function <vim/_editor.lua:262>
Press ENTER or type command to continue

Other tools, such as the gh cli shows an alternate flow to authenticate:

! First copy your one-time code: XXXX-YYYY
Press Enter to open https://github.com/login/device in your browser...

Opening this page and pasting the token and then running :Copilot status thankfully reports Ready, so the solution here would be to detect the failure of calling xdg-open or the browser and then creating an interactive message that leads the developer to open the browser on whatever other device they have and do the authentication flow there.