Speed up gopls startup

[ftassi]

gopls image startup is really slow. This is mainly due to the usermod and chmod performed by the entrypoint script. I tried to implement another dockerfile which uses the official golang images. They are installing go in a world writable directory, so there is no need for a dedicated user any more (hence no usermod and the image spins in milliseconds).

I had to define a GOCACHE dir, but apart from that the image it quite simple and seems to be working fine.

I am testing it on my env with this conf

    capabilities = capabilities,
    cmd = require'lspcontainers'.command('ftassigopls', {
            image = 'lspcontainers/gopls',
            network="bridge",
            cmd_builder = function (runtime, workdir, image, network)
                local volume = workdir..":"..workdir..":z"
                local env = vim.api.nvim_eval('environ()')
                local gopath = env.GOPATH or env.HOME.."/go"
                local gopath_volume = gopath..":"..gopath..":z"

                local group_handle = io.popen("id -g")
                local user_handle = io.popen("id -u")

                local group_id = string.gsub(group_handle:read("*a"), "%s+", "")
                local user_id = string.gsub(user_handle:read("*a"), "%s+", "")

                group_handle:close()
                user_handle:close()

                local user = user_id..":"..group_id

                return {
                    runtime,
                    "container",
                    "run",
                    "--interactive",
                    "--network="..network,
                    "--rm",
                    "--workdir="..workdir,
                    "--volume="..volume,
                    "--user="..user,
                    image
                }
            end,
        }),
    -- cmd = require'lspcontainers'.command('gopls'),
}

[ftassi]

This could also solve https://github.com/lspcontainers/lspcontainers.nvim/issues/68 (not sure though)

[jgero]

I will test it later today or in the next few days, thanks!

[jgero]

Okay I can confirm, this solves the --user related problems of lspcontainers/lspcontainers.nvim#68.

[jgero]

I just ran into a problem with this and I am not sure whether this is again podman related or not. While using your image with the --userid flag I get a permission denied error when trying to download a go package (via code action) into the volume. When I remove the --userid flag it works fine again. Is this the case for you? Do you have any ideas what causes this?

[erikreinert]

I believe I may have improved this in a separate PR if you don't mind testing this LSP and seeing if it's running faster. Thank you!