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+# Miscellaneous Notes
+
+## Quirks about cargo2nix/rust in Nix
+
+If you use submodules in your crate (like `crdt` and `replication` in `garage_table`), you must list them in `default.nix`
+
+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`
+
+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.
+
+
+## Nix
+
+Nix has no armv7 + musl toolchains but armv7l is backward compatible with armv6l.
+
+Signing keys are generated with: 
+
+```
+nix-store --generate-binary-cache-key nix.web.deuxfleurs.fr cache-priv-key.pem cache-pub-key.pem
+```
+
+We copy the secret key in our nix folder:
+
+```
+cp cache-priv-key.pem /etc/nix/signing-key.sec
+```
+
+Manually sign
+    
+We can sign the whole store with:
+
+```
+nix sign-paths --all -k /etc/nix/signing-key.sec
+```
+
+Or simply the current package and its dependencies with:
+
+```
+nix sign-paths --recursive -k /etc/nix/signing-key.sec
+```
+
+Setting a key in `nix.conf` will do the signature at build time automatically without additional commands, edit the `nix.conf` of your builder:
+
+```toml
+secret-key-files = /etc/nix/signing-key.sec
+max-jobs = auto
+cores = 8
+```
+
+Now you are ready to build your packages: 
+
+```bash
+cat > $HOME/.awsrc <<EOF
+export AWS_ACCESS_KEY_ID="xxx"
+export AWS_SECRET_ACCESS_KEY="xxx"
+EOF
+
+# source each time you want to send on the cache
+source ~/.awsrc
+
+# copy garage build dependencies (and not only the output)
+nix-build
+nix-store -qR --include-outputs $(nix-instantiate default.nix) 
+  | xargs nix copy --to 's3://nix?endpoint=garage.deuxfleurs.fr&region=garage'
+  
+# copy shell dependencies
+nix-build shell.nix -A inputDerivation
+nix copy $(nix-store -qR result/) --to 's3://nix?endpoint=garage.deuxfleurs.fr&region=garage' 
+```
+
+More example of nix-copy
+
+```
+# nix-build produces a result/ symlink
+nix copy result/ --to 's3://nix?endpoint=garage.deuxfleurs.fr&region=garage'
+
+# alternative ways to use nix copy
+nix copy nixpkgs.garage --to ...
+nix copy /nix/store/3rbb9qsc2w6xl5xccz5ncfhy33nzv3dp-crate-garage-0.3.0 --to ...
+```
+    
+
+Clear the cache:
+
+```bash
+mc rm --recursive --force garage/nix/
+```
+
+---
+
+A desirable `nix.conf` for a consumer:
+
+```toml
+substituters = https://cache.nixos.org https://nix.web.deuxfleurs.fr
+trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nix.web.deuxfleurs.fr:eTGL6kvaQn6cDR/F9lDYUIP9nCVR/kkshYfLDJf1yKs=
+```
+
+And now, whenever you run a command like:
+
+```
+nix-shell
+nix-build
+```
+
+Our cache will be checked.
+
+### Some references about Nix
+
+
+ - https://doc.rust-lang.org/nightly/rustc/platform-support.html
+ - https://nix.dev/tutorials/cross-compilation
+ - https://nixos.org/manual/nix/unstable/package-management/s3-substituter.html
+ - https://fzakaria.com/2020/09/28/nix-copy-closure-your-nix-shell.html
+ - http://www.lpenz.org/articles/nixchannel/index.html
+
+
+## Drone
+
+Do not try to set a build as trusted from the interface or the CLI tool,
+your request would be ignored. Instead, directly edit the database (table `repos`, column `repo_trusted`).
+
+Drone can do parallelism both at the step and the pipeline level. At the step level, parallelism is restricted to the same runner.
+
+## Building Docker containers
+
+We were:
+  - Unable to use the official Docker plugin because
+    - it requires to mount docker socket in the container but it is not recommended
+    - you cant set the platform when building
+  - Unable to use buildah because it needs `CLONE_USERNS` capability
+  - Unable to use the kaniko plugin for Drone as we can't set the target platform
+  - 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.
+
+Finally we chose to build kaniko through nix and use it in a `nix-shell`.