WIP on using a build.rs to avoid having Gradle set environment variables.

This DOES NOT WORK.  What's needed is a solution for rust-lang/cargo#4121.

Author: ncalexan

build.rs

@@ -0,0 +1,91 @@
+/* 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/. */
+
+use std::env;
+use std::fs::canonicalize;
+use std::path::Path;
+use std::process::Command;
+
+fn main() {
+    // uncomment to print all env vars
+    for (k, v) in std::env::vars() {
+        println!("{} -> {}", k, v);
+    }
+
+    let out_dir = env::var("OUT_DIR").unwrap();
+
+    // /Users/nalexander/Mozilla/application-services/target/debug/build/logins_ffi-d0290628a891f004/out
+    let target = Path::new(&out_dir).ancestors().find(|p| p.ends_with("target")).unwrap();
+
+    // path.ends_with("passwd"));
+
+    // run the build scripts from the lib dir.
+    let libs_dir =
+        canonicalize(target.join("..").join("build").join("libs")).unwrap();
+
+    // canonicalize(Path::new(".").join("build").join("libs")).unwrap();
+    // canonicalize(Path::new(".").join("..").join("..").join("..").join("build").join("libs")).unwrap();
+
+    let target_os = env::var("CARGO_CFG_TARGET_OS");
+    let build_info = match target_os.as_ref().map(|x| &**x) {
+        Ok("linux") => Some(("desktop", "linux-x86-64")),
+        Ok("windows") => Some(("desktop", "win32-x86-64")),
+        Ok("macos") => Some(("desktop", "darwin")),
+        //        Ok("android") => Some("android"), - TODO - need to do better at x-compile support.
+        _ => None,
+    };
+    match build_info {
+        None => println!(
+            "Unknown target OS '{:?}' - not executing external build script",
+            target_os
+        ),
+        Some((build_platform, target_dir)) => {
+            // let status = Command::new("sh")
+            //     .args(&["-c", &format!("./build-all.sh {}", build_platform)])
+            //     .current_dir(libs_dir.as_os_str())
+            //     .status()
+            //     .unwrap();
+            // if !status.success() {
+            //     panic!("external build script failed: {:?}", status);
+            // }
+            // println!("external build script succeeded");
+
+            println!("cargo:rustc-env=OPENSSL_STATIC=1");
+
+            let openssl = libs_dir
+                .join(build_platform)
+                .join(target_dir)
+                .join("openssl");
+            println!("cargo:rustc-env=OPENSSL_DIR={}", openssl.to_str().unwrap());
+
+            let sqlcipher = libs_dir
+                .join(build_platform)
+                .join(target_dir)
+                .join("sqlcipher");
+            println!("cargo:rustc-env=SQLCIPHER_LIB_DIR={}", sqlcipher.join("lib").to_str().unwrap());
+            println!("cargo:rustc-env=SQLCIPHER_INCLUDE_DIR={}", sqlcipher.join("include").to_str().unwrap());
+
+            // // point at the libraries
+            // let openssl = libs_dir
+            //     .join(build_platform)
+            //     .join(target_dir)
+            //     .join("openssl")
+            //     .join("lib");
+            // println!(
+            //     "cargo:rustc-link-search=native={}",
+            //     openssl.to_str().unwrap()
+            // );
+
+            // let sqlcipher = libs_dir
+            //     .join(build_platform)
+            //     .join(target_dir)
+            //     .join("sqlcipher")
+            //     .join("lib");
+            // println!(
+            //     "cargo:rustc-link-search=native={}",
+            //     sqlcipher.to_str().unwrap()
+            // );
+        }
+    };
+}

components/logins/Cargo.toml

@@ -3,6 +3,7 @@ name = "logins"
 edition = "2018"
 version = "0.1.0"
 authors = ["Thom Chiovoloni <[email protected]>"]
+build = "../../build.rs"
 
 [features]
 ffi = ["ffi-support"]

components/logins/ffi/Cargo.toml

@@ -3,6 +3,7 @@ name = "logins_ffi"
 edition = "2018"
 version = "0.1.0"
 authors = ["Thom Chiovoloni <[email protected]>"]
+build = "../../../build.rs"
 
 [lib]
 name = "logins_ffi"

components/places/Cargo.toml

@@ -3,6 +3,7 @@ name = "places"
 edition = "2018"
 version = "0.1.0"
 authors = []
+build = "../../build.rs"
 
 [features]
 ffi = ["ffi-support"]

components/places/ffi/Cargo.toml

@@ -3,6 +3,7 @@ name = "places-ffi"
 edition = "2018"
 version = "0.1.0"
 authors = ["Thom Chiovoloni <[email protected]>"]
+build = "../../../build.rs"
 
 [lib]
 name = "places_ffi"

components/support/sql/Cargo.toml

@@ -3,6 +3,7 @@ name = "sql-support"
 edition = "2018"
 version = "0.1.0"
 authors = ["Thom Chiovoloni <[email protected]>"]
+build = "../../../build.rs"
 
 [features]
 default = ["sqlcipher"]