Minimal container based on Alpine Linux

[odiroot]

You might find it useful, if not please just close this issue.

I managed to build a very lightweight container starting with an Alpine Linux 3.20 base.
The result

REPOSITORY                                     TAG                 IMAGE ID      CREATED             SIZE
docker.io/odiroot/go-librespot                 0.1.3               e2413272e241  58 seconds ago      38.7 MB

See it published here.

Here's the Dockerfile I used

FROM alpine:3.20 AS build

RUN apk -U --no-cache add \
    git go alsa-lib-dev libogg-dev libvorbis-dev

RUN git clone https://github.com/devgianlu/go-librespot.git

RUN cd go-librespot \
    && go build -v ./cmd/daemon


#####

FROM alpine:3.20

RUN apk -U --no-cache add \
    libpulse avahi libgcc gcompat alsa-lib

COPY --from=build go-librespot/daemon /usr/bin/go-librespot

CMD ["/usr/bin/go-librespot", "--config_dir", "/config"]

[praul]

Tested it and its working great for me. Thanks, this is more elegant than my own dockerfile.

[devgianlu]

Have you used any particular flag to run the container? It is not able to talk to ALSA on my setup.

[odiroot]

Have you used any particular flag to run the container? It is not able to talk to ALSA on my setup.

My bad, only tested with pulse (well, pipewire).
I could look into the alsa problem.

[odiroot]

I also forgot to mention how I run this one.

Minimal compose file would be

services:
  go_librespot
    image: docker.io/odiroot/go-librespot:latest
    network_mode: host
    volumes:
      - "./vol_config:/config"
      - "/home/<your username>/.config/pulse/cookie:/pulse_cookie:ro"
      - "/run/user/<your uid>/pulse/native:/pulse_native"
    environment:
      PULSE_SERVER: "unix:/pulse_native"
      PULSE_COOKIE: "/pulse_cookie"
    userns_mode: keep-id

Naturally <your username> has to be replaced with e.g. whoami and <your uid> with id -u.

Now for running with ALSA I believe this should work:

services:
  go_librespot:
    image: docker.io/odiroot/go-librespot:latest
    network_mode: host
    volumes:
      - "./vol_config:/config"
      - "/usr/share/alsa:/usr/share/alsa:ro"
    devices:
      - "/dev/snd:/dev/snd"
    userns_mode: keep-id

[devgianlu]

Can confirm that the PulseAudio setup works, I was not able to get ALSA to work, but nontheless I'll add this to the repo and make official docker images!

[odiroot]

Can confirm that the PulseAudio setup works, I was not able to get ALSA to work, but nontheless I'll add this to the repo and make official docker images!

Sorry about the ALSA thing. I also couldn't get it to work but for a completely unrelated reason (config being ignored).
I might need to look into the build step. Could be that not all required libraries are provided.

[devgianlu]

Could be that not all required libraries are provided.

Build fines for me and on the CI too: https://github.com/devgianlu/go-librespot/actions/runs/12573825057/job/35047226348

I'll leave this open if you think there are possible improvements, feel free to make a PR too!

[odiroot]

Hey @devgianlu
Just one small nitpick. You link to your other project's containers in Readme: https://github.com/devgianlu/go-librespot?tab=readme-ov-file#using-docker

[devgianlu]

Hey @devgianlu Just one small nitpick. You link to your other project's containers in Readme: https://github.com/devgianlu/go-librespot?tab=readme-ov-file#using-docker

Oops, copy pasted too much, thanks for noticing :^)

[praul]

Have you used any particular flag to run the container? It is not able to talk to ALSA on my setup.

My bad, sorry - I only used it with pipe output which should be the most easy scenario for a docker setup

[marco79cgn]

I'm trying to build this on a Raspberry Pi 4 (bookworm, linux/arm64/v8) but unfortunately the docker build always quits with an error. Any idea how I could fix this? Btw. I only need the pipe output (like @praul).

docker-build-log.txt

[devgianlu]

You can use this Dockerfile or a prebuild image

[marco79cgn]

You can use this Dockerfile or a prebuild image

I already tried both. The prebuild image doesn't exist for my platform:

[+] Running 0/1
 ⠧ go_librespot Pulling                                                                                                                                                                                       0.7s 
no matching manifest for linux/arm64/v8 in the manifest list entries

Whereas with the original Dockerfile I get this error:

=> ERROR [build 4/7] COPY go.mod go.sum ./                                                                                                                                                                   0.0s
------                                                                                                                                                                                                             
 > [build 4/7] COPY go.mod go.sum ./:
------
Dockerfile:7
--------------------
   5 |     WORKDIR /src
   6 |     
   7 | >>> COPY go.mod go.sum ./
   8 |     RUN go mod download
   9 |     
--------------------
ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref 6a128ed5-70b8-4722-9c24-c983371ec2b1::wj4afmmx7c8c21gdw3w30w8wd: "/go.sum": not found

[devgianlu]

In order to use the Dockerfile you need to clone the repository and do docker build -t go-librespot . inside of it.

[marco79cgn]

Thanks, I tried. The repo is cloned, the go compiler is on the classpath but still I get an error in a later step:

------
Dockerfile:11
--------------------
   9 |     
  10 |     COPY . .
  11 | >>> RUN go build -v ./cmd/daemon
  12 |     
  13 |     FROM alpine:3.20
--------------------
ERROR: failed to solve: process "/bin/sh -c go build -v ./cmd/daemon" did not complete successfully: exit code: 1