local-cache and link-to-sdk don't seem to work well together

[akien-mga]

Hi,

I've tried to use this action to set up NDK r23c in GHA's Ubuntu 20.04's runner, using the link-to-sdk option so that it would be found where it used to be pre-installed (GH removed it from their Ubuntu 20.04 runner recently: actions/runner-images@8bb825b).

This seems to work if local-cache isn't used, but if I use both options, then the NDK doesn't seem to be found in /usr/local/lib/android/sdk/ndk/23.2.8568313.
Example build log: https://github.com/godotengine/godot/actions/runs/6936937595/job/18870055757

With this config:

      - name: Install Android NDK r23c
        uses: nttld/setup-ndk@v1
        with:
          ndk-version: r23c
          link-to-sdk: true
          local-cache: true

Ideally I'd like to use both, so that I can install the NDK once and keep it cached for all subsequent runs.

I would imagine it would restore /home/runner/.setup-ndk/r23c from the cache, and re-create the symlink in /usr/local/lib/android/sdk/ndk/23.2.8568313 each time.

[DmitriySalnikov]

I fixed it in my repository this way

All files were restored in the correct directory ${{steps.setup-ndk.outputs.ndk-path }}.
The problem was that the symbolic links when restoring from the cache referred to /opt/hostedtoolcache/ndk/r23/x64/ and not to /home/runner/.setup-ndk/r23 (action job)

Changed clang++ from /opt/hostedtoolcache/ndk/r23/x64/toolchains/llvm/prebuilt/linux-x86_64/bin/clang to /home/runner/.setup-ndk/r23/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
Changed llvm-strip from /opt/hostedtoolcache/ndk/r23/x64/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-objcopy to /home/runner/.setup-ndk/r23/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-objcopy

---

I switched to using link-to-sdk: true, but it still requires fixing symbolic links as well. Test with fix/Test without fix

[raftario]

I'll give this a look later today, should be an easy fix. Cool seeing this used in Godot :D

[raftario]

I think I have a good idea what is happening, currently the action will silently skip creating the symlink if the directory already exists. Looks like GitHub forgot to remove their symlink and it's still there pointing to non-existent files. I'll probably just change it to overwrite existing ones, shouldn't be a breaking change given it's the exact same version.

I'm assuming you'd get the exact same error without running the action. Someone should probably verify and report the issue but I'm probably gonna be lazy and just fix it here and let someone else run into it and report the issue themselves.

[akien-mga]

Thanks for the quick update!

I indeed had a similar error without pre-installing the NDK on another Godot repo (godot-cpp): https://github.com/godotengine/godot-cpp/actions/runs/6930951873/job/18859997384
So your findings seem correct.

That didn't break the main godot repo's CI though, presumably because our SCons buildsystem has some logic to check the existence of the NDK and install it if missing. Not sure why it then started failing with using this action with local-cache + link-to-sdk though.

I tested the fix and it doesn't seem to work yet for me:

• First run install NDK and caching it: https://github.com/godotengine/godot/actions/runs/6954839302/job/18922445237?pr=85156
• Second run re-using the cache: https://github.com/godotengine/godot/actions/runs/6955355592/job/18923995748?pr=85156

I may have an invalid cache from a previous attempt that I'd need to clean manually?

[DmitriySalnikov]

I confirm, without manually fixing the links, the same error appears
https://github.com/DmitriySalnikov/godot_debug_draw_3d/actions/runs/6955475648

And no errors with my Restore Android Symlinks step
https://github.com/DmitriySalnikov/godot_debug_draw_3d/actions/runs/6955529520/job/18924474269

But it is very strange that if the cache has not been used yet and Restore Android Symlinks is active, then this step still fixes exactly the same links as after restoring from the cache.
Probably after saving the cache, the unpacked NDK remains in some folder that is not recreated after recovery from the cache. (the paths in the screenshot are taken from the contents of symbolic links)

[DmitriySalnikov]

@raftario can you check again what the problem is?

[raftario]

I will during the weekend

[lynxnb]

Hey, any update on this? I was planning on using this on my repo to avoid caching ndk manually.

[raftario]

The honest answer is that I genuinely have no idea why the issue arises and would need to dig into it more, but didn't have time for it during the holidays and don't have time for it now as I am in the process of moving across the country. I'd be more than happy to accept contributions from someone willing to do the work but in the meantime I'm the only person maintaining this action and fixing a small edge case in it is pretty far down my priority list. I hope you can understand.

[lynxnb]

Thank you for replying, that is completely understandable and I wish you good luck. I might attempt looking into this in the future but my hands are full at the moment, so I don't think that will happen anytime soon.