Hi,

The current IPFS docker images "install just fine" on ARM but give you this error when running:
exec user process caused "exec format error"

Now i've been trying to resolve that.
The first step was to build the docker image for arm (just rebuilding it on an arm machine). This on it's own does make me suspect that the current docker images are not build for ARM64. I hope that could be added?

Rebuilding from git works just fine (not when using a zip, see #7420), but running is then again giving an error. Just a different one. This time:
exec user process caused "no such file or directory"

Next i took a deep dive in the docker container. Running it with:
docker run -d -it --name ipfs_host --entrypoint /bin/sh --restart unless-stopped -v $ipfs_staging:/export -v $ipfs_data:/data/ipfs -p 4001:4001 -p 127.0.0.1:8080:8080 -p 127.0.0.1:5001:5001 ipfs

Note the --entrypoint /bin/sh override and -it so that i can actually get inside that container and run commands.

Which i can then do with:
docker exec -it ipfs_host /bin/sh

Attaching probably works too, i just picked this route.
Then manually running what the actual endpoint did gives me this:

/ # /sbin/tini -- /usr/local/bin/start_ipfs
/bin/sh: /sbin/tini: not found

Which is weird as /sbin/tini and /usr/local/bin/start_ipfs definitely do exist as files.
Just running /usr/local/bin/start_ipfs won't work either:

/ # /usr/local/bin/start_ipfs
Changing user to ipfs
/usr/local/bin/start_ipfs: line 9: su-exec: not found
/usr/local/bin/start_ipfs: exec: line 11: su-exec: not found

Now the issue is getting interesting as su-exec does in fact exist.
So manually running tini and su-exec gave me even more interesting results...

/ # /sbin/tini
/bin/sh: /sbin/tini: not found
/ # /sbin/su-exec 
/bin/sh: /sbin/su-exec: not found

I am suspecting a dependency to be missing here, but i don't know which one. It's surprisingly difficult to get LDD working in that container so i kinda left it there.
I did download tini-static-arm64 to confirm my suspicion. And sure enough, the static version does run!

However, su-exec still has the same issue. I wouldn't be surprised if the fix for tini also fixes su-exec.

Cheers,
Mark