From c6b33fd407069d4eadf20de6184fcbe35a59aba4 Mon Sep 17 00:00:00 2001
From: Louis Dureuil <louis@meilisearch.com>
Date: Thu, 18 Jul 2024 17:28:01 +0200
Subject: [PATCH] Allow `MEILI_NO_VERGEN` env var to skip vergen

---
 CONTRIBUTING.md     | 4 ++++
 build-info/build.rs | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3e11e2f19..092eb10e9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -62,6 +62,10 @@ We recommend using the standard `$HOME/.cache/lindera` directory:
 export LINDERA_CACHE=$HOME/.cache/lindera
 ```
 
+Furthermore, you can improve incremental compilation by setting the `MEILI_NO_VERGEN` environment variable.
+Setting this variable will prevent the Meilisearch binary from being rebuilt each time the directory that hosts the Meilisearch repository changes.
+Do not enable this environment variable for production builds (as it will break the `version` route, among other things).
+
 #### Snapshot-based tests
 
 We are using [insta](https://insta.rs) to perform snapshot-based testing.
diff --git a/build-info/build.rs b/build-info/build.rs
index b1ec0ab47..8fbca603b 100644
--- a/build-info/build.rs
+++ b/build-info/build.rs
@@ -5,6 +5,13 @@ fn main() {
 }
 
 fn emit_git_variables() -> anyhow::Result<()> {
+    println!("cargo::rerun-if-env-changed=MEILI_NO_VERGEN");
+
+    let has_vergen =
+        !matches!(std::env::var_os("MEILI_NO_VERGEN"), Some(x) if x != "false" && x != "0");
+
+    anyhow::ensure!(has_vergen, "disabled via `MEILI_NO_VERGEN`");
+
     // Note: any code that needs VERGEN_ environment variables should take care to define them manually in the Dockerfile and pass them
     // in the corresponding GitHub workflow (publish_docker.yml).
     // This is due to the Dockerfile building the binary outside of the git directory.