third argument support for envs in compile

bin/compile

@@ -2,8 +2,7 @@
 
 # Usage:
 #
-#     $ bin/compile <build-dir> <cache-dir>
-
+#     $ bin/compile <build-dir> <cache-dir> <env-path>
 
 # Fail fast and fail hard.
 set -eo pipefail
@@ -16,6 +15,8 @@ BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
 ROOT_DIR=$(dirname $BIN_DIR)
 BUILD_DIR=$1
 CACHE_DIR=$2
+ENV_FILE=$3
+
 
 CACHED_DIRS=".heroku"
 
@@ -222,7 +223,7 @@ puts-step "Installing dependencies using Pip ($PIP_VERSION)"
 
 # Django collectstatic support.
 bpwatch start collectstatic
-  source $BIN_DIR/steps/collectstatic
+  sub-env $BIN_DIR/steps/collectstatic
 bpwatch stop collectstatic
 
 # ### Finalize
@@ -261,6 +262,6 @@ bpwatch start anvil_appdir_commit
   if [ "$SLUG_ID" ]; then
     deep-mv $TMP_APP_DIR $APP_DIR
   fi
-bpwatch stop anvil_appdir_commit
 
+bpwatch stop anvil_appdir_commit
 bpwatch stop compile

bin/steps/hooks/post_compile

@@ -3,5 +3,5 @@
 if [ -f bin/post_compile ]; then
     echo "-----> Running post-compile hook"
     chmod +x bin/post_compile
-    bin/post_compile
+    sub-env bin/post_compile
 fi

bin/steps/hooks/pre_compile

@@ -3,5 +3,5 @@
 if [ -f bin/pre_compile ]; then
     echo "-----> Running pre-compile hook"
     chmod +x bin/pre_compile
-    bin/pre_compile
+    sub-env bin/pre_compile
 fi

bin/utils

@@ -59,4 +59,6 @@ function deep-rm (){
   find -H $1 -maxdepth 1 -name '.*' -a \( -type d -o -type f -o -type l \) -exec rm -fr '{}' \;
 }
 
-
+function sub-env (){
+   (export $(egrep -v '^(GIT_DIR|PYTHONHOME|PYTHONPATH|LD_LIBRARY_PATH|LIBRARY_PATH|PATH)' $ENV_FILE); $1)
+}