102 lines
3.4 KiB
Markdown
102 lines
3.4 KiB
Markdown
+++
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title = "Miscellaneous notes"
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weight = 20
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+++
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## Quirks about cargo2nix/rust in Nix
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If you use submodules in your crate (like `crdt` and `replication` in `garage_table`), you must list them in `default.nix`
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The Windows target does not work. it might be solvable through [overrides](https://github.com/cargo2nix/cargo2nix/blob/master/overlay/overrides.nix). Indeed, we pass `x86_64-pc-windows-gnu` but mingw need `x86_64-w64-mingw32`
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We have a simple [PR on cargo2nix](https://github.com/cargo2nix/cargo2nix/pull/201) that fixes critical bugs but the project does not seem very active currently. We must use [my patched version of cargo2nix](https://github.com/superboum/cargo2nix) to enable i686 and armv6l compilation. We might need to contribute to cargo2nix in the future.
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## Nix
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Nix has no armv7 + musl toolchains but armv7l is backward compatible with armv6l.
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```bash
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cat > $HOME/.awsrc <<EOF
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export AWS_ACCESS_KEY_ID="xxx"
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export AWS_SECRET_ACCESS_KEY="xxx"
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EOF
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# source each time you want to send on the cache
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source ~/.awsrc
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# copy garage build dependencies (and not only the output)
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nix-build
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nix-store -qR --include-outputs $(nix-instantiate default.nix)
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| xargs nix copy --to 's3://nix?endpoint=garage.deuxfleurs.fr®ion=garage'
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# copy shell dependencies
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nix-build shell.nix -A inputDerivation
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nix copy $(nix-store -qR result/) --to 's3://nix?endpoint=garage.deuxfleurs.fr®ion=garage'
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```
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More example of nix-copy
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```
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# nix-build produces a result/ symlink
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nix copy result/ --to 's3://nix?endpoint=garage.deuxfleurs.fr®ion=garage'
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# alternative ways to use nix copy
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nix copy nixpkgs.garage --to ...
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nix copy /nix/store/3rbb9qsc2w6xl5xccz5ncfhy33nzv3dp-crate-garage-0.3.0 --to ...
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```
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Clear the cache:
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```bash
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mc rm --recursive --force garage/nix/
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```
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---
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A desirable `nix.conf` for a consumer:
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```toml
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substituters = https://cache.nixos.org https://nix.web.deuxfleurs.fr
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trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nix.web.deuxfleurs.fr:eTGL6kvaQn6cDR/F9lDYUIP9nCVR/kkshYfLDJf1yKs=
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```
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And now, whenever you run a command like:
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```
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nix-shell
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nix-build
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```
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Our cache will be checked.
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### Some references about Nix
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- https://doc.rust-lang.org/nightly/rustc/platform-support.html
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- https://nix.dev/tutorials/cross-compilation
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- https://nixos.org/manual/nix/unstable/package-management/s3-substituter.html
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- https://fzakaria.com/2020/09/28/nix-copy-closure-your-nix-shell.html
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- http://www.lpenz.org/articles/nixchannel/index.html
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## Drone
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Do not try to set a build as trusted from the interface or the CLI tool,
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your request would be ignored. Instead, directly edit the database (table `repos`, column `repo_trusted`).
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Drone can do parallelism both at the step and the pipeline level. At the step level, parallelism is restricted to the same runner.
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## Building Docker containers
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We were:
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- Unable to use the official Docker plugin because
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- it requires to mount docker socket in the container but it is not recommended
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- you cant set the platform when building
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- Unable to use buildah because it needs `CLONE_USERNS` capability
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- Unable to use the kaniko plugin for Drone as we can't set the target platform
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- Unable to use the kaniko container provided by Google as we can't run arbitrary logic: we need to put our secret in .docker/config.json.
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Finally we chose to build kaniko through nix and use it in a `nix-shell`.
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