Update stats action for running locally (vercel#14143)

Noticed a few things that could be updated to make running the stats locally better e.g. if the folder name didn't match the name of the repo in the `stats-config.js` file it would fail to run and the `yarn` cache could break diffing from a cached package being used instead

Author: ijjk

.github/actions/next-stats-action/src/constants.js

@@ -8,6 +8,9 @@ const mainRepoDir = path.join(workDir, mainRepoName)
 const diffRepoDir = path.join(workDir, diffRepoName)
 const statsAppDir = path.join(workDir, 'stats-app')
 const diffingDir = path.join(workDir, 'diff')
+const yarnEnvValues = {
+  YARN_CACHE_FOLDER: path.join(workDir, 'yarn-cache'),
+}
 const allowedConfigLocations = [
   './',
   '.stats-app',
@@ -24,5 +27,6 @@ module.exports = {
   mainRepoDir,
   diffRepoDir,
   statsAppDir,
+  yarnEnvValues,
   allowedConfigLocations,
 }

.github/actions/next-stats-action/src/index.js

@@ -46,6 +46,12 @@ if (!allowedActions.has(actionInfo.actionName) && !actionInfo.isRelease) {
       )
     }
 
+    if (actionInfo.isLocal) {
+      // make sure to use local repo location instead of the
+      // one provided in statsConfig
+      statsConfig.mainRepo = actionInfo.prRepo
+    }
+
     // clone main repository/ref
     if (!actionInfo.skipClone) {
       await cloneRepo(statsConfig.mainRepo, mainRepoDir)

.github/actions/next-stats-action/src/run/index.js

@@ -6,7 +6,7 @@ const logger = require('../util/logger')
 const getDirSize = require('./get-dir-size')
 const collectStats = require('./collect-stats')
 const collectDiffs = require('./collect-diffs')
-const { statsAppDir, diffRepoDir, mainRepoDir } = require('../constants')
+const { statsAppDir, diffRepoDir, yarnEnvValues } = require('../constants')
 
 async function runConfigs(
   configs = [],
@@ -32,12 +32,7 @@ async function runConfigs(
 
       // if stats-config is in root of project we're analyzing
       // the whole project so copy from each repo
-      const curStatsAppPath =
-        relativeStatsAppDir === './'
-          ? mainRepoStats
-            ? diffRepoDir
-            : mainRepoDir
-          : path.join(diffRepoDir, relativeStatsAppDir)
+      const curStatsAppPath = path.join(diffRepoDir, relativeStatsAppDir)
 
       // clean statsAppDir
       await fs.remove(statsAppDir)
@@ -61,7 +56,9 @@ async function runConfigs(
       }
 
       const buildStart = new Date().getTime()
-      await exec(`cd ${statsAppDir} && ${statsConfig.appBuildCommand}`)
+      await exec(`cd ${statsAppDir} && ${statsConfig.appBuildCommand}`, false, {
+        env: yarnEnvValues,
+      })
       curStats.General.buildDuration = new Date().getTime() - buildStart
 
       // apply renames to get deterministic output names
@@ -182,7 +179,11 @@ async function linkPkgs(pkgDir = '', pkgPaths) {
     }
   }
   await fs.writeFile(pkgJsonPath, JSON.stringify(pkgData, null, 2), 'utf8')
-  await exec(`cd ${pkgDir} && yarn install`)
+
+  await fs.remove(yarnEnvValues.YARN_CACHE_FOLDER)
+  await exec(`cd ${pkgDir} && yarn install`, false, {
+    env: yarnEnvValues,
+  })
 }
 
 module.exports = runConfigs

.github/actions/next-stats-action/src/util/exec.js

@@ -9,9 +9,13 @@ const env = {
   PR_STATS_COMMENT_TOKEN: '',
 }
 
-function exec(command, noLog = false) {
+function exec(command, noLog = false, opts = {}) {
   if (!noLog) logger(`exec: ${command}`)
-  return execP(command, { env, timeout: 180 * 1000 })
+  return execP(command, {
+    timeout: 180 * 1000,
+    ...opts,
+    env: { ...env, ...opts.env },
+  })
 }
 
 exec.spawn = function spawn(command = '', opts = {}) {