WIP: Drone CI config

.drone.jsonnet

@@ -0,0 +1,134 @@
+// This is the CI config for Plume.
+// It uses a Drone CI instance, on https://ci.joinplu.me
+
+// First of all, we define a few useful constants
+
+// This Docker image contains everything we need to build Plume.
+// Its Dockerfile can be found at https://git.joinplu.me/plume/buildenv
+local plumeEnv = "plumeorg/plume-buildenv:v0.0.9";
+
+// A utility function to generate a new pipeline
+local basePipeline(name, steps) = {
+    kind: "pipeline",
+    name: name,
+    type: "docker",
+    steps: steps
+};
+
+// A pipeline step that restores the cache.
+// The cache contains all the cargo build files.
+// Thus, we don't have to download and compile all of our dependencies for each
+// commit.
+// This cache is only "deleted" when the contents of Cargo.lock changes.
+//
+// We use this plugin for caching: https://github.com/meltwater/drone-cache/
+//
+// Potential TODO: use one cache per pipeline, as we used to do when we were
+// using CircleCI.
+local restoreCache = {
+    name: "restore-cache",
+    image: "meltwater/drone-cache:dev",
+    pull: true,
+    settings: {
+        backend: "filesystem",
+        restore: true,
+        cache_key: 'v0-{{ checksum "Cargo.lock" }}-{{ .Commit.Branch }}',
+        archive_format: "gzip",
+        mount: [ "~/.cargo/", "./target" ]
+    },
+    volumes: { name: "cache", path: "/tmp/cache" }
+};
+
+// And a step that saves the cache.
+local saveCache = {
+    name: "save-cache",
+    image: "meltwater/drone-cache:dev",
+    pull: true,
+    settings: {
+        backend: "filesystem",
+        rebuild: true,
+        cache_key: 'v0-{{ checksum "Cargo.lock" }}-{{ .Commit.Branch }}',
+        archive_format: "gzip",
+        mount: [ "~/.cargo/", "./target" ]
+    },
+    volumes: { name: "cache", path: "/tmp/cache" }
+};
+
+// Finally, the Docker volume to store the cache
+local cacheVolume = {
+    name: "cache",
+    host: {
+        path: "/var/lib/cache"
+    }
+};
+
+// This step starts a PostgreSQL database if the db parameter is "postgres",
+// otherwise it does nothing.
+local startDb(db) = if db == "postgres" then {
+    name: "start-db",
+    image: "postgres:9.6-alpine",
+    detach: true,
+    environment: {
+        POSTGRES_USER: "postgres",
+        POSTGRES_DB: "plume"
+    }
+};
+
+// Here starts the actual list of pipelines!
+
+// First one: a pipeline that runs cargo fmt, and that fails if the style of
+// the code is not standard.
+local CargoFmt() = basePipeline(
+    "cargo-fmt",
+    [
+        restoreCache,
+        {
+            name: "cargo-fmt",
+            image: plumeEnv,
+            commands: [ "cargo fmt --all -- --check" ]
+        },
+        saveCache,
+    ]
+);
+
+local Clippy(db) = basePipeline(
+    "clippy-" + db,
+    [
+        restoreCache,
+        {
+            local cmd(pkg, features=true) = if features then
+                "cargo clippy --no-default-features --features " + db
+                + "--release -p " + pkg + " -- -D warnings"
+            else
+                "cargo clippy --no-default-features --release -p "
+                + pkg + " -- -D warnings",
+            name: "clippy",
+            image: plumeEnv,
+            commands: [
+                cmd("plume"), cmd("plume-cli"), cmd("plume-front", false)
+            ],
+        },
+        saveCache,
+    ]
+);
+
+// TODO
+
+local Unit(db) = {};
+local Integration(db) = {};
+local Release(db) = {};
+local PushTranslations() = {};
+
+// And finally, the list of all our pipelines:
+[
+    CargoFmt(),
+    Clippy("postgres"),
+    Clippy("sqlite"),
+    Unit("postgres"),
+    Unit("sqlite"),
+    Integration("postgres"),
+    Integration("sqlite"),
+    Release("postgres"),
+    Release("sqlite"),
+    PushTranslations()
+]