Use `docker buildx` to add arm platform to our docker image

[huan]

Now docker can Building Multi-Architecture Docker Images With Buildx which is very nice.

We use a different branch/tag for armhf support in the past, I believe it's time to use the latest docker buildx technology now.

Related to: #52 #9

[huan]

We have just published an experimental version of SMF 1.2:

$ docker buildx imagetools inspect zixia/simple-mail-forwarder:1.2
Name:      docker.io/zixia/simple-mail-forwarder:1.2
MediaType: application/vnd.docker.distribution.manifest.list.v2+json
Digest:    sha256:7cacf28ae8a6d86c6dab3d42dc5dd0464235f7cd8de524bb12c53aec11129398

Manifests: 
  Name:      docker.io/zixia/simple-mail-forwarder:1.2@sha256:b68f59095e5c38bd22677885e9c78e2bb9c4e9e810059aadde6ab650cc3d204a
  MediaType: application/vnd.docker.distribution.manifest.v2+json
  Platform:  linux/amd64

  Name:      docker.io/zixia/simple-mail-forwarder:1.2@sha256:45de2c7c96ebba77ed708e221cdb79e03ac18f8c20e94a9c75af80e49a28748c
  MediaType: application/vnd.docker.distribution.manifest.v2+json
  Platform:  linux/arm/v6

  Name:      docker.io/zixia/simple-mail-forwarder:1.2@sha256:e22830cca614c2631e698261dcfd182b3a66bc4fd0d78881b1c9896ae623c80e
  MediaType: application/vnd.docker.distribution.manifest.v2+json
  Platform:  linux/arm/v7

Please let me know if you can confirm any of those versions works as expected.

[huan]

Implemented by https://github.com/huan/docker-simple-mail-forwarder/commit/cd1410d2b5762ec2039d66d2cd9c751d7d195374

[huan]

We have republished v1.3 with multi-platforms docker image support (powered by buildx), please test and let me know whether it works under your platform.

[huan]

Hi @dimitrovs, please take a look at our new v1.3 version of multi-platforms docker images which can manage all architectures (arm/x86) in the same master branch!

[mrsufgi]

maybe im doing something wrong but -

the container restarts after that, stuck on a loop (arm64, rock pi 4A)

[huan]

@mrsufgi It seems that the arch is not right for your platform:

cannot execute binary file: Exec format error

Could you please tell us what docker image platform are you using?

We will use the arm version from https://github.com/just-containers/s6-overlay/releases/, please let me know if you can confirm it can work with the arm64 with rock pi 4A or not:

https://github.com/huan/docker-simple-mail-forwarder/blob/044933af0495eff8b5c58b7f8a5358bf0432400f/script/install-s6-overlay.sh#L13-L21

Update

According to this SO answer: Differences between arm64 and aarch64

So AArch64 and ARM64 refer to the same thing.

Maybe we need to use the aarch64 version of s6-overlay for aarch64 and armv8l?

[huan]

The latest SMF with v1.3.1 has been published.

Please try to upgrade to it to see if your problem has been solved or not on the arm64 rock pi 4A.

[mrsufgi]

docker image is still 1.3 (and latest is still 1.3), just removed local image and started again, same error.

Linux rockpi-4a 5.8.12-rockchip64 #20.08.5 SMP PREEMPT Sun Sep 27 12:47:16 CEST 2020 aarch64 GNU/Linux

@huan I deleted my existing images and pulled again (1.3, 1.3.1 wasn't available). I will try again, but that didn't seem to work :O

[guysoft]

Just tried latest and 1.3 tag. They seem not to work. The container boot-loops. If I run it from entrypoint: /bin/sh then run the entrypoint manually I get:

s6-supervise syslog-ng: warning: can't happen: timeout while the service is up!
s6-supervise postfix: warning: can't happen: timeout while the service is up!

And it keeps going on like that.

Raspsberry Pi OS with armf userspace and 64bit kernel.

[huan]

We have created a new issue to track the arm 64 architecture and let's close this finished issue.