feat: support dotenv

codex-rs/Cargo.lock

@@ -636,6 +636,7 @@ dependencies = [
  "codex-login",
  "codex-mcp-server",
  "codex-tui",
+ "dotenvy",
  "serde_json",
  "tokio",
  "tracing",
@@ -1272,6 +1273,12 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+
 [[package]]
 name = "dupe"
 version = "0.9.1"

codex-rs/cli/Cargo.toml

@@ -26,6 +26,7 @@ codex-login = { path = "../login" }
 codex-linux-sandbox = { path = "../linux-sandbox" }
 codex-mcp-server = { path = "../mcp-server" }
 codex-tui = { path = "../tui" }
+dotenvy = "0.15.7"
 serde_json = "1"
 tokio = { version = "1", features = [
     "io-std",

codex-rs/cli/src/main.rs

@@ -99,6 +99,12 @@ fn main() -> anyhow::Result<()> {
 }
 
 async fn cli_main(codex_linux_sandbox_exe: Option<PathBuf>) -> anyhow::Result<()> {
+    // Load env vars from ~/.codex/.env and `$(pwd)/.env`.
+    if let Ok(codex_home) = codex_core::config::find_codex_home() {
+        dotenvy::from_path(codex_home.join(".env")).ok();
+    }
+    dotenvy::dotenv().ok();
+
     let cli = MultitoolCli::parse();
 
     match cli.subcommand {

codex-rs/core/src/config.rs

@@ -539,7 +539,7 @@ fn default_model() -> String {
 ///   function will Err if the path does not exist.
 /// - If `CODEX_HOME` is not set, this function does not verify that the
 ///   directory exists.
-fn find_codex_home() -> std::io::Result<PathBuf> {
+pub fn find_codex_home() -> std::io::Result<PathBuf> {
     // Honor the `CODEX_HOME` environment variable when it is set to allow users
     // (and tests) to override the default location.
     if let Ok(val) = std::env::var("CODEX_HOME") {