python.pkgs.supervise_api: use patch to specify path to supervise

pkgs/development/python-modules/supervise_api/default.nix

@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, substituteAll
 , supervise
 , isPy3k
 , whichcraft
@@ -16,11 +17,18 @@ buildPythonPackage rec {
     sha256 = "1230f42294910e83421b7d3b08a968d27d510a4a709e966507ed70db5da1b9de";
   };
 
-  propagatedBuildInputs = [
-    supervise
-  ] ++ lib.optionals ( !isPy3k ) [
-    whichcraft
+  patches = [
+    (substituteAll {
+      src = ./supervise-path.patch;
+      inherit supervise;
+    })
   ];
+
+  # In the git repo, supervise_api lives inside a python subdir
+  patchFlags = [ "-p2" ];
+
+  propagatedBuildInputs = lib.optional (!isPy3k) whichcraft;
+
   checkInputs = [ utillinux ];
 
   meta = {

pkgs/development/python-modules/supervise_api/supervise-path.patch

@@ -0,0 +1,15 @@
+diff --git a/python/supervise_api/supervise.py b/python/supervise_api/supervise.py
+index 497d3ea..be57e35 100644
+--- a/python/supervise_api/supervise.py
++++ b/python/supervise_api/supervise.py
+@@ -41,9 +41,7 @@ try:
+ except:
+     from whichcraft import which
+ 
+-supervise_utility_location = which("supervise")
+-if not supervise_utility_location:
+-    raise FileNotFoundError(errno.ENOENT, "Executable not found in PATH", "supervise")
++supervise_utility_location = '@supervise@/bin/supervise'
+ 
+ 
+ def ignore_sigchld():