Readme

.dockerignore

@@ -0,0 +1 @@
+.git

.gitignore

@@ -1 +1,2 @@
-node_modules
+node_modules
+.idea

Dockerfile

@@ -1,8 +1,15 @@
-FROM node:10.15.1-alpine
+FROM node:14-alpine
+
+# from https://github.com/spritsail/alpine-cmake/blob/master/Dockerfile
+# needed to build @hanazuki/node-jsonnet
+RUN apk --no-cache add cmake clang clang-dev make gcc g++ libc-dev linux-headers
 
 WORKDIR /app
-COPY . .
 
+COPY package.json yarn.lock ./
 RUN yarn
 
-CMD /usr/local/bin/node /app/plugin.js
+COPY plugin.js ./
+COPY lib lib/
+
+CMD /usr/local/bin/node /app/plugin.js

README.md

@@ -59,3 +59,9 @@ See [the official docs](https://docs.drone.io/extend/config) for extra informati
 ## Pattern Matching
 
 This uses the [Glob](https://www.npmjs.com/package/glob) module under the hood, so supports all pattern matching syntaxes of this module.
+
+## Deployment
+To deploy to AWS ECR, pull down a temp mfa token for AWS Platinum, and run the following:
+1. `aws ecr get-login-password --region us-east-2 --profile mfa | docker login --username AWS --password-stdin 650007492008.dkr.ecr.us-east-2.amazonaws.com`
+2. `docker build -t 650007492008.dkr.ecr.us-east-2.amazonaws.com/drone-config-plugin-changeset-conditional:1.0.0 .`
+3. `docker image push 650007492008.dkr.ecr.us-east-2.amazonaws.com/drone-config-plugin-changeset-conditional:1.0.0`

lib/parsed-yaml-retriever.js

@@ -1,13 +1,17 @@
+const Jsonnet = require('@hanazuki/node-jsonnet')
 const { promisify } = require('util')
 const yaml = require('yaml')
-const getParsedYaml = gh => async data => {
+
+const jsonnet = new Jsonnet.Jsonnet()
+
+const getParsedYaml = (gh) => async (data) => {
   let contents = data.yaml
   if (!contents) {
     const options = {
       user: data.repo.namespace,
       repo: data.repo.name,
       ref: data.build.ref,
-      path: data.repo.config_path
+      path: data.repo.config_path,
     }
     const file = await promisify(gh.repos.getContent)(options)
     if (!file.content) {
@@ -16,11 +20,15 @@ const getParsedYaml = gh => async data => {
     }
     contents = Buffer.from(file.content, 'base64').toString()
   }
+  if (data.repo.config_path.endsWith('.jsonnet')) {
+    // this returns formatted JSON that we can then parse to YAML as normal
+    contents = await jsonnet.evaluateSnippet(contents)
+  }
   const docs = contents.split('\n---\n')
-  const parsedDocs = docs.map(d => {
+  const parsedDocs = docs.map((d) => {
     return yaml.parse(d)
   })
   return parsedDocs
 }
 
-module.exports = getParsedYaml
+module.exports = getParsedYaml

package.json

@@ -1,6 +1,6 @@
 {
   "name": "drone-config-changeset-conditional",
-  "version": "1.0.0",
+  "version": "5.0.0",
   "description": "",
   "main": "plugin.js",
   "scripts": {
@@ -9,11 +9,16 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "body-parser": "^1.18.3",
-    "express": "^4.16.4",
-    "github4": "^1.1.1",
-    "globule": "^1.2.1",
-    "http-signature": "^1.2.0",
-    "yaml": "^1.7.1"
+    "@hanazuki/node-jsonnet": "0.4.2",
+    "body-parser": "1.18.3",
+    "express": "4.16.4",
+    "github4": "1.1.1",
+    "globule": "1.2.1",
+    "http-signature": "1.2.0",
+    "yaml": "1.7.1"
+  },
+  "prettier": {
+    "semi": false,
+    "singleQuote": true
   }
 }

plugin.js

@@ -57,15 +57,27 @@ app.post('/', bodyParser.json({limit: '50mb'}), async (req, res) => {
       }
     }
 
-    const trimmedSteps = py.steps.filter(s => {
-      if (!s.when || !s.when.changeset || !s.when.changeset.includes) return true
+    const transformedSteps = py.steps.map(s => {
+      if (!s.when || !s.when.changeset || !s.when.changeset.includes) {
+        return s;
+      }
+
       const requiredFiles = s.when.changeset.includes
       const matchedFiles = glob.match(requiredFiles, filesChanged, { dot: true })
       console.log('Matched files for step:', matchedFiles.length, 'Allowed matches:', requiredFiles)
-      return matchedFiles.length
+
+      if (!matchedFiles.length) {
+        // Add an impossible conditional which guarantees the step gets skipped
+        s.when = {
+          ...s.when,
+          event: { exclude: ['*'] },
+        }
+      }
+
+      return s;
     })
 
-    return trimmedSteps.length ? yaml.stringify({ ...py, steps: trimmedSteps }) : nullYaml(index)
+    return transformedSteps.length ? yaml.stringify({ ...py, steps: transformedSteps }) : nullYaml(index)
   })
 
   res.json({ Data: finalYamlDocs.join('\n---\n') })