refactor(build): generate revision into out_dir

.gitignore

@@ -23,7 +23,6 @@ Servo.app
 .config.mk.last
 /glfw
 capture_webrender/
-/components/compositing/webrender_revision.rs
 
 # Editors
 

components/compositing/build.rs

@@ -7,27 +7,11 @@ extern crate toml;
 use std::env;
 use std::fs::File;
 use std::io::{Read, Write};
-
-const WEBRENDER_REVISION_TEMPLATE: &'static str =
-"/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/// auto-generated by cargo. do not manually modify.
-pub const REVISION: &'static str = ";
+use std::path::Path;
 
 fn main() {
-    let current_path = env::current_dir().expect("Failed to access path to lockfile");
-    let lockfile_path = current_path.join("..").join("..").join("Cargo.lock");
-    let revision_file_path = current_path.join("webrender_revision.rs");
-
-    let mut existing_revision_exported = String::new();
-    match File::open(&revision_file_path) {
-        Ok(mut f) => {
-        f.read_to_string(&mut existing_revision_exported).unwrap_or_default();
-        },
-        Err(_) => ()
-    }
+    let lockfile_path = Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap()).join("..").join("..").join("Cargo.lock");
+    let revision_file_path = Path::new(&env::var_os("OUT_DIR").unwrap()).join("webrender_revision.rs");
 
     let mut lockfile = String::new();
     File::open(lockfile_path).expect("Cannot open lockfile")
@@ -49,13 +33,8 @@ fn main() {
                     let parsed: Vec<&str> = source.split("#").collect();
                     let revision = if parsed.len() > 1 { parsed[1] } else { source };
 
-                    if let Some(_) = existing_revision_exported.find(revision) {
-                        return
-                    }
-
-                    let revision_contents = format!("{}\"{}\";", WEBRENDER_REVISION_TEMPLATE, revision);
                     let mut revision_module_file = File::create(&revision_file_path).unwrap();
-                    write!(&mut revision_module_file, "{}", revision_contents).unwrap();
+                    write!(&mut revision_module_file, "{}", format!("\"{}\"", revision)).unwrap();
                 },
                 _ => panic!("Cannot find package definitions in lockfile")
             }

components/compositing/compositor.rs

@@ -37,7 +37,6 @@ use touch::{TouchHandler, TouchAction};
 use webrender;
 use webrender_api::{self, DeviceIntPoint, DevicePoint, DeviceUintRect, DeviceUintSize, HitTestFlags, HitTestResult};
 use webrender_api::{LayoutVector2D, ScrollEventPhase, ScrollLocation};
-use webrender_revision::REVISION;
 use windowing::{self, MouseWindowEvent, WebRenderDebugOption, WindowMethods};
 
 #[derive(Debug, PartialEq)]
@@ -1553,7 +1552,8 @@ impl<Window: WindowMethods> IOCompositor<Window> {
 
                 match File::create(revision_file_path) {
                     Ok(mut file) => {
-                        if let Err(err) = write!(&mut file, "{}", REVISION) {
+                        let revision = include!(concat!(env!("OUT_DIR"), "/webrender_revision.rs"));
+                        if let Err(err) = write!(&mut file, "{}", revision) {
                             println!("Unable to write webrender revision: {:?}", err)
                         }
                     }

components/compositing/lib.rs

@@ -39,7 +39,6 @@ use style_traits::CSSPixel;
 mod compositor;
 pub mod compositor_thread;
 mod touch;
-mod webrender_revision;
 pub mod windowing;
 
 pub struct SendableFrameTree {