diff --git a/ofborg/src/bin/builder.rs b/ofborg/src/bin/builder.rs
index 711b164..bb12fc7 100644
--- a/ofborg/src/bin/builder.rs
+++ b/ofborg/src/bin/builder.rs
@@ -1,6 +1,7 @@
 extern crate ofborg;
 extern crate amqp;
 
+use std::collections::LinkedList;
 use std::env;
 use amqp::{Consumer, Channel};
 use amqp::protocol::basic::{Deliver,BasicProperties};
@@ -12,6 +13,9 @@ use amqp::Session;
 use amqp::Table;
 use std::process;
 use std::io::Error;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::BufRead;
 
 use ofborg::config;
 use ofborg::checkout;
@@ -34,11 +38,14 @@ fn main() {
         process::exit(1);
     }
 
-    let cloner = checkout::cached_cloner(Path::new("/home/grahamc/.nix-test-rs"));
+    let cloner = checkout::cached_cloner(Path::new(&cfg.checkout.root));
+    let nix = nix::new(cfg.nix.system.clone(), cfg.nix.remote);
 
     channel.basic_consume(
         worker::new(BuildWorker{
-            cloner: cloner
+            cloner: cloner,
+            nix: nix,
+            system: cfg.nix.system.clone()
         }),
         "build-inputs-samples",
         "lmao1",
@@ -58,6 +65,8 @@ fn main() {
 
 struct BuildWorker {
     cloner: checkout::CachedCloner,
+    nix: nix::Nix,
+    system: String,
 }
 
 impl worker::SimpleWorker for BuildWorker {
@@ -76,8 +85,12 @@ impl worker::SimpleWorker for BuildWorker {
         }
     }
 
-    fn job_to_actions(&self, channel: &mut amqp::Channel, job: &buildjob::BuildJob) -> buildjob::Actions {
-        return buildjob::Actions{};
+    fn job_to_actions(&self, channel: amqp::Channel, job: buildjob::BuildJob) -> buildjob::Actions {
+        return buildjob::Actions{
+            system: self.system.clone(),
+            channel: channel,
+            job: job,
+        };
     }
 
 
@@ -95,9 +108,48 @@ impl worker::SimpleWorker for BuildWorker {
         co.fetch_pr(job.pr.number).unwrap();
         co.merge_commit(job.pr.head_sha.as_ref()).unwrap();
 
-        println!("Got path: {:?}", refpath);
+        println!("Got path: {:?}, building", refpath);
 
-        let cmd = nix::safely_build_attrs_cmd(refpath, job.attrs);
+
+        let success: bool;
+        let reader: BufReader<File>;
+        match self.nix.safely_build_attrs(refpath.as_ref(), job.attrs) {
+            Ok(r) => {
+                success = true;
+                reader = BufReader::new(r);
+            }
+            Err(r) => {
+                success = false;
+                reader = BufReader::new(r);
+            }
+        }
+        println!("ok built ({:?}), building", success);
+
+        let l10 = reader.lines().fold(LinkedList::new(),
+
+                                      |mut coll, line|
+                                      {
+                                          match line {
+                                              Ok(e) => { coll.push_back(e); }
+                                              Err(wtf) => {
+                                                  println!("Got err in lines: {:?}", wtf);
+                                                  coll.push_back(String::from("<line omitted due to error>"));
+                                              }
+                                          }
+
+                                          if coll.len() == 11 {
+                                              coll.pop_front();
+                                          }
+
+                                          return coll
+                                      }
+        );
+        println!("Lines: {:?}", l10);
+
+        resp.build_finished(
+            success,
+            l10.into_iter().collect::<Vec<_>>()
+        );
 
         return Ok(())
     }
diff --git a/ofborg/src/config.rs b/ofborg/src/config.rs
index 90793a5..61a1e48 100644
--- a/ofborg/src/config.rs
+++ b/ofborg/src/config.rs
@@ -5,6 +5,8 @@ use std::io::Read;
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct Config {
+    pub checkout: CheckoutConfig,
+    pub nix: NixConfig,
     pub rabbitmq: RabbitMQConfig,
 }
 
@@ -15,6 +17,18 @@ pub struct RabbitMQConfig {
     pub password: String,
 }
 
+#[derive(Serialize, Deserialize, Debug)]
+pub struct NixConfig {
+    pub system: String,
+    pub remote: String,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct CheckoutConfig {
+    pub root: String,
+}
+
+
 impl RabbitMQConfig {
     pub fn as_uri(&self) -> String{
         return format!("amqps://{}:{}@{}//", self.username, self.password, self.host);
diff --git a/ofborg/src/message/buildjob.rs b/ofborg/src/message/buildjob.rs
index 25e4637..04c18d6 100644
--- a/ofborg/src/message/buildjob.rs
+++ b/ofborg/src/message/buildjob.rs
@@ -1,15 +1,41 @@
 use ofborg::message::{Pr,Repo};
+use ofborg::message::buildresult;
 use serde_json;
+use amqp::{Basic, Channel, protocol};
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct BuildJob {
     pub repo: Repo,
     pub pr: Pr,
-    pub attrs: Vec<String>,
+    pub attrs: Vec<String>
 }
 
 pub fn from(data: &Vec<u8>) -> Result<BuildJob, serde_json::error::Error> {
     return serde_json::from_slice(&data);
 }
 
-pub struct Actions{}
+pub struct Actions {
+    pub system: String,
+    pub job: BuildJob,
+    pub channel: Channel
+}
+
+impl Actions {
+    pub fn build_finished(&mut self, success: bool, lines: Vec<String>) {
+        let msg = buildresult::BuildResult {
+            repo: self.job.repo.clone(),
+            pr: self.job.pr.clone(),
+            system: self.system.clone(),
+            output: lines,
+            success: success
+        };
+
+        let props =  protocol::basic::BasicProperties {
+            content_type: Some("application/json".to_owned()),
+            ..Default::default()
+        };
+
+        self.channel.basic_publish("build-results", "", true, true,
+                             props, serde_json::to_string(&msg).unwrap().into_bytes()).unwrap();
+    }
+}
diff --git a/ofborg/src/message/buildresult.rs b/ofborg/src/message/buildresult.rs
new file mode 100644
index 0000000..1c25087
--- /dev/null
+++ b/ofborg/src/message/buildresult.rs
@@ -0,0 +1,10 @@
+use ofborg::message::{Pr,Repo};
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct BuildResult {
+    pub repo: Repo,
+    pub pr: Pr,
+    pub system: String,
+    pub output: Vec<String>,
+    pub success: bool
+}
diff --git a/ofborg/src/message/common.rs b/ofborg/src/message/common.rs
index 4071b8d..9d1f88a 100644
--- a/ofborg/src/message/common.rs
+++ b/ofborg/src/message/common.rs
@@ -1,11 +1,11 @@
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct Repo {
     pub full_name: String,
     pub clone_url: String,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct Pr {
     pub target_branch: Option<String>,
     pub number: i64,
diff --git a/ofborg/src/message/mod.rs b/ofborg/src/message/mod.rs
index 3564393..bb305a2 100644
--- a/ofborg/src/message/mod.rs
+++ b/ofborg/src/message/mod.rs
@@ -1,4 +1,5 @@
 mod common;
 pub mod buildjob;
+pub mod buildresult;
 
 use self::common::{Pr,Repo};
diff --git a/ofborg/src/nix.rs b/ofborg/src/nix.rs
index d6754aa..225e02b 100644
--- a/ofborg/src/nix.rs
+++ b/ofborg/src/nix.rs
@@ -3,34 +3,60 @@ use std::ffi::OsString;
 use std::process::{Command,Stdio};
 use tempfile::tempfile;
 use std::fs::File;
+use std::io::Seek;
+use std::io::SeekFrom;
 
-pub fn safely_build_attrs(nixpkgs: &Path, attrs: Vec<String>) -> Result<File,File> {
-    let mut nixpath = OsString::new();
-    nixpath.push("nixpkgs=");
-    nixpath.push(nixpkgs.as_os_str());
+pub struct Nix {
+    system: String,
+    remote: String
+}
 
-    let stdout = tempfile().unwrap();
-    let stderr = stdout.try_clone().unwrap();
-    let reader = stderr.try_clone().unwrap();
-
-    let mut cmd = Command::new("nix-build")
-        .env_clear()
-        .current_dir(nixpkgs)
-        .stdout(Stdio::from(stdout))
-        .stderr(Stdio::from(stderr))
-        .env("NIX_PATH", nixpath);
-
-    for attr in attrs {
-        cmd.arg("-A");
-        cmd.arg(attr);
+pub fn new(system: String, remote: String) -> Nix {
+    return Nix{
+        system: system,
+        remote: remote,
     }
+}
 
-    let stat = cmd
-        .status()
-        .unwrap();
+impl Nix {
+    pub fn safely_build_attrs(&self, nixpkgs: &Path, attrs: Vec<String>) -> Result<File,File> {
+        let mut nixpath = OsString::new();
+        nixpath.push("nixpkgs=");
+        nixpath.push(nixpkgs.as_os_str());
 
+        let mut attrargs: Vec<String> = Vec::with_capacity(attrs.len() * 2);
+        for attr in attrs {
+            attrargs.push(String::from("-A"));
+            attrargs.push(attr);
+        }
 
-    return Ok(reader);
+        let stdout = tempfile().unwrap();
+        let stderr = stdout.try_clone().unwrap();
+        let mut reader = stderr.try_clone().unwrap();
+
+        let status = Command::new("nix-build")
+            .env_clear()
+            .current_dir(nixpkgs)
+            .stdout(Stdio::from(stdout))
+            .stderr(Stdio::from(stderr))
+            .env("NIX_PATH", nixpath)
+            .env("NIX_REMOTE", &self.remote)
+            .arg("--no-out-link")
+            .args(&["--option", "restrict-eval", "true"])
+            .args(&["--argstr", "system", &self.system])
+            .arg("--keep-going")
+            .args(attrargs)
+            .status()
+            .unwrap();
+
+        reader.seek(SeekFrom::Start(0)).unwrap();
+
+        if status.success() {
+            return Ok(reader)
+        } else {
+            return Err(reader)
+        }
+    }
 }
 
 /*
diff --git a/ofborg/src/worker.rs b/ofborg/src/worker.rs
index 5b8515e..d9b0471 100644
--- a/ofborg/src/worker.rs
+++ b/ofborg/src/worker.rs
@@ -19,7 +19,7 @@ pub trait SimpleWorker {
     fn msg_to_job(&self, method: &Deliver, headers: &BasicProperties,
                   body: &Vec<u8>) -> Result<Self::J, String>;
 
-    fn job_to_actions(&self,  channel: &mut Channel, job: &Self::J) -> Self::A;
+    fn job_to_actions(&self,  channel: Channel, job: Self::J) -> Self::A;
 }
 
 pub fn new<T: SimpleWorker>(worker: T) -> Worker<T> {
diff --git a/shell.nix b/shell.nix
index 481e36a..bc6bfe7 100644
--- a/shell.nix
+++ b/shell.nix
@@ -12,7 +12,7 @@ let
 
   phpEnv = stdenv.mkDerivation rec {
     name = "gh-event-forwarder";
-    src = ./.;
+    src = null;
     buildInputs = with pkgs; [
       php
       phpPackages.composer
@@ -29,7 +29,6 @@ let
 
   rustEnv = stdenv.mkDerivation rec {
     name = "gh-event-forwarder";
-    src = ./.;
     buildInputs = with pkgs; [
       php
       phpPackages.composer
@@ -38,7 +37,7 @@ let
       openssl
     ];
 
-    HISTFILE = "${src}/.bash_hist";
+    HISTFILE = "${toString ./.}/.bash_hist";
   };