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librespot: switch from cross-compile to native ARM64 build

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Cross-compile on x86_64 with qemu emulation takes >30min and hits
60-90min ceiling due to slow crate-by-crate aarch64 build under qemu.
Native ARM64 build on RPi 3B+ with --jobs 2 (1GB RAM) is much faster.

Rust 1.85.1 installed via rustup on RPi (precompiled aarch64 toolchain).
This commit is contained in:
David Gwilliam
2026-07-01 05:00:22 -07:00
parent 573821426c
commit e5b52fa56f
1 changed files with 15 additions and 23 deletions
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infra/librespot/Dockerfile
+15 -23
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@@ -1,51 +1,43 @@
# Librespot (Spotify Connect) for ARM64 # Librespot (Spotify Connect) for ARM64
# Multi-stage: cross-compile Rust app on x86_64 builder, ship slim runtime. # Multi-stage Docker build. Run on ARM64 host (RPi 3B+ etc).
# Audio output: PulseAudio (connect to audio-bridge via TCP localhost:4713). # Audio output: PulseAudio (connects to audio-bridge via TCP localhost:4713).
FROM rust:1.85.1-bookworm AS builder FROM rust:1.85.1-bookworm AS builder
# Cross-compile toolchain for aarch64 RUN apt-get update \
RUN rustup target add aarch64-unknown-linux-gnu
RUN dpkg --add-architecture arm64 \
&& apt-get update \
&& apt-get install -y --no-install-recommends \ && apt-get install -y --no-install-recommends \
gcc-aarch64-linux-gnu \ libpulse-dev \
libpulse-dev:arm64 \ libasound2-dev \
libasound2-dev:arm64 \
libssl-dev:arm64 \
&& rm -rf /var/lib/apt/lists/* && rm -rf /var/lib/apt/lists/*
# Build librespot. Pin to a known tag.
ARG LIBRESPOT_VERSION=v0.8.0 ARG LIBRESPOT_VERSION=v0.8.0
RUN git clone --depth 1 --branch ${LIBRESPOT_VERSION} \ RUN git clone --depth 1 --branch ${LIBRESPOT_VERSION} \
https://github.com/librespot-org/librespot.git /src https://github.com/librespot-org/librespot.git /src
WORKDIR /src WORKDIR /src
ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc
RUN cargo build --release --target aarch64-unknown-linux-gnu --no-default-features --features="pulseaudio-backend" # Limit parallelism to 2 (RPi 3B+ has 4 cores but only 1GB RAM).
# Lower = less memory pressure, slower build. Higher = OOM risk.
RUN cargo build --release --jobs 2 \
--no-default-features \
--features="pulseaudio-backend"
FROM debian:bookworm-slim FROM debian:bookworm-slim
RUN dpkg --add-architecture arm64 \ RUN apt-get update \
&& apt-get update \
&& apt-get install -y --no-install-recommends \ && apt-get install -y --no-install-recommends \
ca-certificates \ ca-certificates \
libpulse0:arm64 \ libpulse0 \
libasound2:arm64 \ libasound2 \
libssl3:arm64 \
&& rm -rf /var/lib/apt/lists/* && rm -rf /var/lib/apt/lists/*
COPY --from=builder /src/target/aarch64-unknown-linux-gnu/release/librespot /usr/local/bin/librespot COPY --from=builder /src/target/release/librespot /usr/local/bin/librespot
# Cache dir for Spotify credentials
VOLUME ["/var/cache/librespot"] VOLUME ["/var/cache/librespot"]
# PulseAudio bridge is at localhost:4713 (audio-bridge)
ENV PULSE_SERVER=tcp:127.0.0.1:4713 ENV PULSE_SERVER=tcp:127.0.0.1:4713
CMD ["librespot", \ CMD ["librespot", \
"--name", "Klubhaus", \ "--name", "Klubhaus", \
"--backend", "pulseaudio", \ "--backend", "pulseaudio", \
"--device", "alsa_output.default", \
"--bitrate", "320", \ "--bitrate", "320", \
"--enable-audio-cache", \ "--enable-audio-cache", \
"--cache", "/var/cache/librespot"] "--cache", "/var/cache/librespot"]