find local installed libmongoc first

mongoc-sys/Cargo.toml

@@ -13,3 +13,6 @@ exclude     = ["mongo-c-driver-*"]
 [dependencies]
 libc        = "0.2"
 openssl-sys = "0.9"
+
+[build-dependencies]
+semver = "0.8"

mongoc-sys/build.rs

@@ -1,10 +1,36 @@
+extern crate semver;
+
 use std::env;
 use std::path::Path;
 use std::process::Command;
+use std::str::FromStr;
+
+use semver::Version;
 
 static VERSION: &'static str = "1.8.0"; // Should be the same major version as in the manifest
 
 fn main() {
+    let mut local_exist = false;
+    if let Ok(output) = Command::new("pkg-config")
+        .arg("--modversion")
+        .arg("libmongoc-1.0")
+        .output()
+    {
+        if output.status.success() {
+            if let Ok(ref stdout) = String::from_utf8(output.stdout) {
+                if let Ok(local_version) = Version::from_str(stdout) {
+                    let except_version = Version::from_str(VERSION).unwrap();
+                    if local_version.major == except_version.major &&
+                        local_version.minor == except_version.minor
+                    {
+                        local_exist = true;
+                    }
+                }
+            }
+        }
+    }
+
+    if !local_exist {
         let out_dir_var = env::var("OUT_DIR").expect("No out dir");
         let out_dir = format!("{}/{}", out_dir_var, VERSION);
         let driver_src_path = format!("mongo-c-driver-{}", VERSION);
@@ -17,22 +43,24 @@ fn main() {
                 VERSION,
                 VERSION
             );
-        assert!(Command::new("curl").arg("-O") // Save to disk
+            assert!(
+                Command::new("curl").arg("-O") // Save to disk
                                     .arg("-L") // Follow redirects
                                     .arg(url)
                                     .status()
                                     .expect("Could not run curl")
-                                    .success());
-
-        let archive_name = format!(
-            "mongo-c-driver-{}.tar.gz",
-            VERSION
+                                    .success()
             );
-        assert!(Command::new("tar").arg("xzf")
+
+            let archive_name = format!("mongo-c-driver-{}.tar.gz", VERSION);
+            assert!(
+                Command::new("tar")
+                    .arg("xzf")
                     .arg(&archive_name)
                     .status()
                     .expect("Could not run tar")
-                                   .success());
+                    .success()
+            );
 
             // Configure and install
             let mut command = Command::new("sh");
@@ -60,18 +88,24 @@ fn main() {
             }
 
             assert!(command.status().expect("Could not run configure").success());
-        assert!(Command::new("make").
-                         current_dir(&driver_src_path).
-                         env("CFLAGS", "-DMONGOC_TRACE").
-                         status().
-                         expect("Could not run make").
-                         success());
-        assert!(Command::new("make").
-                         arg("install").
-                         current_dir(&driver_src_path).
-                         status().
-                         expect("Could not run make install").
-                         success());
+            assert!(
+                Command::new("make")
+                    .current_dir(&driver_src_path)
+                    .env("CFLAGS", "-DMONGOC_TRACE")
+                    .status()
+                    .expect("Could not run make")
+                    .success()
+            );
+            assert!(
+                Command::new("make")
+                    .arg("install")
+                    .current_dir(&driver_src_path)
+                    .status()
+                    .expect("Could not run make install")
+                    .success()
+            );
+
+
         }
 
         // Output to Cargo
@@ -79,3 +113,4 @@ fn main() {
         println!("cargo:rustc-link-lib=static=bson-1.0");
         println!("cargo:rustc-link-lib=static=mongoc-1.0");
     }
+}