ci(build-info): compute git metadata using cli

.github/workflows/deploy-dev.yaml

@@ -2,9 +2,6 @@ name: Vercel Preview Deployment
 env:
   VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
   VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
-  GIT_REPO_NAME: ${{ github.repository }}
-  GIT_COMMIT_BRANCH: ${{ github.ref_name }}
-  GIT_COMMIT_SHA: ${{ github.sha }}
 on:
   push:
     branches:
@@ -25,8 +22,6 @@ jobs:
         run: npm install --global vercel@latest
       - name: Pull Vercel Environment Information
         run: vercel pull --yes --environment=preview --token=${{ secrets.VERCEL_TOKEN }}
-      - name: Strip Owner Part from GIT_REPO_NAME
-        run: echo "GIT_REPO_NAME=${GIT_REPO_NAME##*/}" >> $GITHUB_ENV
       - name: Build Project Artifacts
         run: vercel build --token=${{ secrets.VERCEL_TOKEN }}
       - name: Deploy Project Artifacts to Vercel

lib/server-only/buildInfo.ts

@@ -33,16 +33,23 @@ export function getCommitEntryForFile(filepath: string, head: boolean = true) {
 
 /// Returns the commit info for this build
 async function getBuildCommitInfo(): Promise<BuildCommitInfo> {
-  // NOTE: These environment variables are prepoluated in next.config.js
-  // Assert each required environment variable is a non-empty string.
-  assertEnvVarExists(process.env.GIT_REPO_NAME, "GIT_REPO_NAME");
-  assertEnvVarExists(process.env.GIT_COMMIT_SHA, "GIT_COMMIT_SHA");
-  assertEnvVarExists(process.env.GIT_COMMIT_BRANCH, "GIT_COMMIT_BRANCH");
+  // NOTE: We assume our build environment has our git repo
+  // and git history configured, which getCommitEntryForFile already assumes.
+  // So lets just use the git cli to get the info.
+  const branch = launchShellCmd("git branch --show-current")?.toString().trim();
+  if (!branch)
+    throw "Could not compute build branch using git cli. Are you sure the build environment has git set up?";
+  const hash = launchShellCmd(`git log -1 --pretty=format:"%H"`)
+    ?.toString()
+    .trim();
+  if (!hash)
+    throw "Could not compute build commit hash using git cli. Are you sure the build environment has git set up?";
+  const repo = "personal-website"; // This should never change.
 
   return {
-    repo: process.env.GIT_REPO_NAME,
-    hash: process.env.GIT_COMMIT_SHA,
-    branch: process.env.GIT_COMMIT_BRANCH,
+    repo,
+    hash,
+    branch,
   };
 }
 
@@ -56,7 +63,7 @@ function launchShellCmd(cmd: string) {
     }
   } catch (error) {
     console.log(error);
-    return buffer;
+    return undefined;
   }
   return buffer;
 }
@@ -74,3 +81,5 @@ function assertEnvVarExists(
     throw new Error(`Environment variable "${variableName}" is not a string.`);
   }
 }
+
+launchShellCmd("git branch --show-current")?.toString().trim();

next.config.js

@@ -19,15 +19,6 @@ module.exports = (phase, { defaultConfig }) => {
     },
     output: "standalone",
   };
-  if (phase != PHASE_DEVELOPMENT_SERVER) {
-    // NOTE: Alternatively, we can make this less imperative by
-    // returning a different config object and the env field
-    // On production builds, we should be are vars from
-    // whatever platform we are using right now its Vercel.
-    // process.env.GIT_REPO_NAME = process.env.VERCEL_GIT_REPO_SLUG;
-    // process.env.GIT_COMMIT_SHA = process.env.VERCEL_GIT_COMMIT_SHA;
-    // process.env.GIT_COMMIT_BRANCH = process.env.VERCEL_GIT_COMMIT_REF;
-  }
 
   return nextConfig;
 };