fix env

src/github.rs

@@ -1,5 +1,4 @@
 use std::collections::HashMap;
-use std::env;
 use std::iter::FromIterator;
 use std::path::PathBuf;
 use std::process::Command;
@@ -14,6 +13,8 @@ use sha1::Sha1;
 use structopt::StructOpt;
 use toml::Value as TomlValue;
 
+use handler::Environment;
+
 #[derive(StructOpt)]
 struct Opt {
     /// JSON input
@@ -50,7 +51,11 @@ fn default_path() -> PathBuf {
     PathBuf::from(".")
 }
 
-pub fn main(config: &TomlValue, input: &JsonValue) -> Result<JsonValue, Error> {
+pub(crate) fn main(
+    env: &Environment,
+    config: &TomlValue,
+    input: &JsonValue,
+) -> Result<JsonValue, Error> {
     let config_str = {
         let mut buf: Vec<u8> = Vec::new();
         {
@@ -94,8 +99,7 @@ pub fn main(config: &TomlValue, input: &JsonValue) -> Result<JsonValue, Error> {
 
     let payload: GithubPayload =
         serde_json::from_str(&payload.body).expect("Could not parse Github input into json");
-    let mut target_path =
-        PathBuf::from(env::var("DIP_WORKDIR").expect("Could not determine working directory"));
+    let mut target_path = env.workdir.clone();
     target_path.push(&config.path);
     Command::new("git")
         .arg("clone")

src/handler.rs

@@ -26,13 +26,20 @@ pub struct Handler {
 #[derive(Clone)]
 pub enum Action {
     /// A builtin function (for example, the Github handler).
-    Builtin(fn(&TomlValue, &JsonValue) -> Result<JsonValue, Error>),
+    Builtin(fn(&Environment, &TomlValue, &JsonValue) -> Result<JsonValue, Error>),
     /// A command represents a string to be executed by `bash -c`.
     Command(String),
     /// A program represents one of the handlers specified in the `handlers` directory.
     Program(String),
 }
 
+/// Describes the environment for running a builtin.
+#[derive(Clone)]
+pub struct Environment {
+    /// The current working directory.
+    pub workdir: PathBuf,
+}
+
 impl fmt::Debug for Action {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match &self {
@@ -94,7 +101,9 @@ impl Handler {
 
         let output: Box<Future<Item = JsonValue, Error = Error> + Send> = match action {
             Action::Builtin(ref func) => {
-                let result = func(&config, &input);
+                let workdir = temp_path_cp.clone();
+                let env = Environment { workdir };
+                let result = func(&env, &config, &input);
                 Box::new(future::result(result))
             }
             Action::Command(ref cmd) => {