Add Docker image for ARM builds

[mxpv]

ref #48

[pblgomez]

waiting for a docker arm image

[pblgomez]

I created a Dockerfile that works on arm32v7

https://github.com/pblgomez/PodSync-Armv6-Docker

with build.sh it install latest Podsync and builds the docker image

[pinano]

Thanks a lot! I have been waiting for this for a few weeks. I have just built the image in my rpi4 and it works like a charm!!! :)

[pblgomez]

I waited too, but couldn't wait any longer jejeje. Hope @mxpv uses this and makes a official arm docker.

[mxpv]

Hi. @pblgomez thanks for the reference. I'll get to this eventually :)

[melgu]

@pblgomez Hi! First of all, thank you very much.
The build process went fine. But I ran into an issue at startup.

time="2020-04-15T13:35:04Z" level=info msg="\n _______  _______  ______   _______           _        _______ \n(  ____ )(  ___  )(  __  \\ (  ____ \\|\\     /|( (    /|(  ____ \\\n| (    )|| (   ) || (  \\  )| (    \\/( \\   / )|  \\  ( || (    \\/\n| (____)|| |   | || |   ) || (_____  \\ (_) / |   \\ | || |      \n|  _____)| |   | || |   | |(_____  )  \\   /  | (\\ \\) || |      \n| (      | |   | || |   ) |      ) |   ) (   | | \\   || |      \n| )      | (___) || (__/  )/\\____) |   | |   | )  \\  || (____/\\\n|/       (_______)(______/ \\_______)   \\_/   |/    )_)(_______/\n"
time="2020-04-15T13:35:04Z" level=info msg="running podsync" commit=26e3ed40bfbd2138350b611f60cfdc6f55b7a266 date="2020-04-14T17:41:37Z" version=2.1.1
time="2020-04-15T13:35:09Z" level=info msg="using youtube-dl 2020.03.24\n"
time="2020-04-15T13:35:09Z" level=info msg="using ffmpeg ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers\nbuilt with gcc 9.2.0 (Alpine 9.2.0)\nconfiguration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --disable-debug\nlibavutil      56. 31.100 / 56. 31.100\nlibavcodec     58. 54.100 / 58. 54.100\nlibavformat    58. 29.100 / 58. 29.100\nlibavdevice    58.  8.100 / 58.  8.100\nlibavfilter     7. 57.100 /  7. 57.100\nlibavresample   4.  0.  0 /  4.  0.  0\nlibswscale      5.  5.100 /  5.  5.100\nlibswresample   3.  5.100 /  3.  5.100\nlibpostproc    55.  5.100 / 55.  5.100\n"
time="2020-04-15T13:35:09Z" level=info msg="opening database \"db\""
time="2020-04-15T13:35:09Z" level=info msg="All 0 tables opened in 0s\n"
time="2020-04-15T13:35:09Z" level=fatal msg="failed to open database" error="failed to open database: Mmap value log file. Path=db/000000.vlog. Error=cannot allocate memory"

I'm on the Pi 2 Model B v1.1

[pblgomez]

Yes, I tried too and it fails, something changed in this latest release.
Try to build it with v2.0.7
@mxpv Can you tell me what changed
level=fatal msg="failed to open database" error="could not mkdir database dir: mkdir db: permission denied"
Glad I could help

The problem exist with 2.1.0 and newer.

@melgu There's a branch on my github to keep using 2.0.7 till this is fixed. Use that one till then. ;)

[pblgomez]

@pblgomez Hi! First of all, thank you very much.
The build process went fine. But I ran into an issue at startup.

time="2020-04-15T13:35:04Z" level=info msg="\n _______  _______  ______   _______           _        _______ \n(  ____ )(  ___  )(  __  \\ (  ____ \\|\\     /|( (    /|(  ____ \\\n| (    )|| (   ) || (  \\  )| (    \\/( \\   / )|  \\  ( || (    \\/\n| (____)|| |   | || |   ) || (_____  \\ (_) / |   \\ | || |      \n|  _____)| |   | || |   | |(_____  )  \\   /  | (\\ \\) || |      \n| (      | |   | || |   ) |      ) |   ) (   | | \\   || |      \n| )      | (___) || (__/  )/\\____) |   | |   | )  \\  || (____/\\\n|/       (_______)(______/ \\_______)   \\_/   |/    )_)(_______/\n"
time="2020-04-15T13:35:04Z" level=info msg="running podsync" commit=26e3ed40bfbd2138350b611f60cfdc6f55b7a266 date="2020-04-14T17:41:37Z" version=2.1.1
time="2020-04-15T13:35:09Z" level=info msg="using youtube-dl 2020.03.24\n"
time="2020-04-15T13:35:09Z" level=info msg="using ffmpeg ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers\nbuilt with gcc 9.2.0 (Alpine 9.2.0)\nconfiguration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --disable-debug\nlibavutil      56. 31.100 / 56. 31.100\nlibavcodec     58. 54.100 / 58. 54.100\nlibavformat    58. 29.100 / 58. 29.100\nlibavdevice    58.  8.100 / 58.  8.100\nlibavfilter     7. 57.100 /  7. 57.100\nlibavresample   4.  0.  0 /  4.  0.  0\nlibswscale      5.  5.100 /  5.  5.100\nlibswresample   3.  5.100 /  3.  5.100\nlibpostproc    55.  5.100 / 55.  5.100\n"
time="2020-04-15T13:35:09Z" level=info msg="opening database \"db\""
time="2020-04-15T13:35:09Z" level=info msg="All 0 tables opened in 0s\n"
time="2020-04-15T13:35:09Z" level=fatal msg="failed to open database" error="failed to open database: Mmap value log file. Path=db/000000.vlog. Error=cannot allocate memory"

I'm on the Pi 2 Model B v1.1

I just programmed my first python app
https://github.com/pblgomez/ptsooy
Maybe it works for you too. You can download your own subscriptions and it make everything else like podsync.
Try it please.

[tuxpeople]

You could do this with a multi stage Dockerfile:

FROM golang:alpine AS builder
LABEL stage=builder
WORKDIR /workspace
COPY . .
RUN go build -o /bin/podsync ./cmd/podsync

FROM alpine:3.10
WORKDIR /app/
RUN wget -O /usr/bin/youtube-dl https://github.com/ytdl-org/youtube-dl/releases/latest/download/youtube-dl && \
    chmod +x /usr/bin/youtube-dl && \
    apk --no-cache add ca-certificates python ffmpeg tzdata
COPY --from=builder /bin/podsync .
CMD ["/app/podsync"]

Actually, the second part is the current podsync Dockerfile. Except for the COPY, as I had to adjust it to copy the binary from the builder part. You can now do this:
docker buildx build -t podsync-test --platform=linux/amd64,linux/arm64,linux/arm/v6,linux/386 .

But you need to have buildx activated. However, it currently fails because youtube-dl is currently offline due to DMCA. But if you remove the wget and the chmod line and add youtube-dl to the apk line, it works.

Further readings:

• https://www.docker.com/blog/multi-arch-images/
• https://www.docker.com/blog/multi-arch-build-and-images-the-simple-way/
• https://www.docker.com/blog/multi-arch-build-what-about-travis/
• https://medium.com/@artur.klauser/building-multi-architecture-docker-images-with-buildx-27d80f7e2408

However, as I really need the arm build, I'll use this in the meantime:

Dockerfile:

FROM golang:alpine AS builder
# PODSYNC_VERSION can be changed, by passing `--build-arg PODSYNC_VERSION=<new version>` during docker build
ARG PODSYNC_VERSION=v1
ENV PODSYNC_VERSION=${PODSYNC_VERSION}
LABEL stage=builder
WORKDIR /workspace
RUN wget -O - https://github.com/mxpv/podsync/archive/${PODSYNC_VERSION}.tar.gz | tar -xz --strip-components=1
RUN go build -o /bin/podsync ./cmd/podsync

FROM alpine:3.12
WORKDIR /app/
RUN apk --no-cache upgrade && apk --no-cache add ca-certificates ffmpeg tzdata youtube-dl
COPY --from=builder /bin/podsync .
CMD ["/app/podsync"]

Commands:

PCURVERSION=$(curl -s https://github.com/mxpv/podsync/releases/ | grep tree -m 1 | cut -d'"' -f2 | cut -d'/' -f5)
docker buildx build --push -t tdeutsch/podsync:latest -t tdeutsch/podsync:${PCURVERSION} -t tdeutsch/podsync:$(echo ${PCURVERSION} | cut -d'.' -f-2) --platform=linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7,linux/386 --build-arg PODSYNC_VERSION=${PCURVERSION} .

Result:

[tuxpeople]

Find my (above explained) stuff in a bit changed way here: https://github.com/tuxpeople/docker-podsync

This is what I use currently till we get the official ARM Image :-D

[tuxpeople]

@mxpv I have no idea about goreleaser but saw this here and thought about a pull request: https://carlosbecker.com/posts/multi-platform-docker-images-goreleaser-gh-actions/

However, this would end up in different tags for the different archs. And I'm not a fan of that. This here would "fix" that: https://namiops.medium.com/golang-multi-arch-docker-image-with-github-action-b59a62c8d2bd

But in this case you would have to move the image build from goreleaser into the github workflow. Would that be okay for you?