From 05b41b8b84e218d04cacd421f0395e91e582f879 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafael=20=C3=81vila=20de=20Esp=C3=ADndola?=
 <espindola@chiselstrike.com>
Date: Mon, 25 Oct 2021 13:35:19 -0700
Subject: [PATCH] Add support for a RUSTY_V8_ARCHIVE environment variable
 (#812)

---
 README.md | 10 ++++++++++
 build.rs  |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 88053c31..b1409290 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,16 @@ for REL in v0.13.0 v0.12.0; do
 done
 ```
 
+## The `RUSTY_V8_ARCHIVE` environment variable
+
+Tell the build script to use a specific v8 library. This can be an URL
+or a path. This is useful when you have a prebuilt archive somewhere:
+
+```bash
+export RUSTY_V8_ARCHIVE=/path/to/custom_archive.a
+cargo build
+```
+
 ## Build V8 from Source
 
 Use `V8_FROM_SOURCE=1 cargo build -vv` to build the crate completely from
diff --git a/build.rs b/build.rs
index 9b2d04ff..56daa0e4 100644
--- a/build.rs
+++ b/build.rs
@@ -201,6 +201,9 @@ fn download_ninja_gn_binaries() {
 }
 
 fn static_lib_url() -> String {
+  if let Ok(custom_archive) = env::var("RUSTY_V8_ARCHIVE") {
+    return custom_archive;
+  }
   let default_base = "https://github.com/denoland/rusty_v8/releases/download";
   let base =
     env::var("RUSTY_V8_MIRROR").unwrap_or_else(|_| default_base.into());