license-generator: Use compile-time environment variables

For whatever reason, the environment variables in my `.htaccess` weren't
getting passed to my FastCGI executables on my production server.

Wasn't sure how to get them passed to the programs, so decided instead
to compile the env variables into the binaries.

To do that, we source the environment file before building the release
builds in the Docker container.

4 files changed, 7 insertions, 12 deletions

diff --git a/.htaccess b/.htaccess
index 186a57f..d9278c8 100644
--- a/.htaccess
+++ b/.htaccess
@@ -1,6 +1,3 @@
-SetEnv LOG_FILE "license_generator.log"
-SetEnv DATABASE_URL "mysql://localhost:3306/dome_key"
-
 ErrorDocument 404 /404.html
 
 
diff --git a/Makefile b/Makefile
index a93270d..6ba245f 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ internal_error.html: internal_error.in.html
 
 # Compile binaries for Linux
 license-generator/target/release/fulfillment \
-license-generator/target/release/license:
+license-generator/target/release/license: production-config/env
 	docker run \
 		--rm \
 		--interactive \
@@ -21,7 +21,10 @@ license-generator/target/release/license:
 		--volume $$PWD/license-generator:/app \
 		--workdir /app \
 		rust:1.30.1-trusty \
-		cargo build --release
+		bash -c " \
+			source ../production-config/env; \
+			cargo build --release \
+		"
 
 .PHONY: deploy
 deploy: license-generator/target/release/fulfillment \
diff --git a/license-generator/src/database.rs b/license-generator/src/database.rs
index 478c97e..85683e9 100644
--- a/license-generator/src/database.rs
+++ b/license-generator/src/database.rs
@@ -1,12 +1,9 @@
-use std::env;
-
 use mysql;
 
 use errors::*;
 
 pub fn get_database_pool() -> Result<mysql::Pool> {
-    let connection_url = env::var("DATABASE_URL")
-        .chain_err(|| "DATABASE_URL environment variable not found")?;
+    let connection_url = env!("DATABASE_URL");
     let pool = mysql::Pool::new_manual(4, 15, connection_url)?;
 
     Ok(pool)
diff --git a/license-generator/src/logger.rs b/license-generator/src/logger.rs
index 1b6e07b..d286808 100644
--- a/license-generator/src/logger.rs
+++ b/license-generator/src/logger.rs
@@ -1,4 +1,3 @@
-use std::env;
 use std::fs::OpenOptions;
 
 use fastcgi;
@@ -7,8 +6,7 @@ use simplelog::{Config, LevelFilter, WriteLogger};
 use errors::*;
 
 pub fn init() -> Result<()> {
-    let log_file_path = env::var("LOG_FILE")
-        .chain_err(|| "LOG_FILE environment variable not found")?;
+    let log_file_path = env!("LOG_FILE");
 
     let log_file = OpenOptions::new()
         .append(true)