python-linkme-wrapper

pkgs/development/interpreters/python/python-linkme-wrapper.nix

@@ -0,0 +1,13 @@
+{ stdenv }:
+
+stdenv.mkDerivation {
+  name = "python-linkme-wrapper-1.0";
+
+  unpackPhase = "true";
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cat ${./python-linkme-wrapper.sh} >  $out/bin/.python-linkme-wrapper
+    chmod +x $out/bin/.python-linkme-wrapper
+  '';
+}

pkgs/development/interpreters/python/python-linkme-wrapper.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+#
+# Install it into a nix profile and from there build symlink chains.
+# The chain will be followed to set the PYTHONPATH
+# A/bin/foo -> B/bin/bar -> NIXENV/bin/.python-linkme-wrapper.sh
+#
+
+if test ! -L "$0"; then
+   echo "Link me!"
+   exit 1
+fi
+
+PROG=$(basename "$0")
+SITES=
+
+pypath() {
+  BIN=$(dirname "$1")
+  BIN=$(realpath -s "$BIN")
+  ENV=$(dirname "$BIN")
+  SITE="$ENV/lib/python2.7/site-packages"
+  SITES="$SITES${SITES:+:}$SITE"
+
+  PRG=$BIN/$(readlink "$1")
+
+  if test -L "$PRG"; then
+    pypath "$PRG"
+  fi
+}
+
+pypath $(realpath -s "$0")
+
+export PYTHONPATH="$PYTHONPATH${PYTHONPATH:+:}$SITES"
+
+exec $BIN/$PROG "$@"

pkgs/top-level/all-packages.nix

@@ -2859,6 +2859,8 @@ let
 
   pythonhomeWrapper = callPackage ../development/interpreters/python/pythonhome-wrapper.nix { };
 
+  pythonLinkmeWrapper = callPackage ../development/interpreters/python/python-linkme-wrapper.nix { };
+
   pyrex = pyrex095;
 
   pyrex095 = callPackage ../development/interpreters/pyrex/0.9.5.nix { };