nixpkgs/pkgs/development/python-modules/buildout-nix/nix.patch

--- a/src/zc/buildout/easy_install.py	2013-08-27 22:28:40.233718116 +0200
+++ b/src/zc/buildout/easy_install.py   2013-10-07 00:29:31.077413935 +0200
@@ -227,6 +227,12 @@
 
     def _satisfied(self, req, source=None):
         dists = [dist for dist in self._env[req.project_name] if dist in req]
+        try:
+            dists = ([dist for dist in dists
+                     if dist.precedence == pkg_resources.DEVELOP_DIST]
+                     + [pkg_resources.get_distribution(req.project_name)])
+        except pkg_resources.DistributionNotFound:
+            pass
         if not dists:
             logger.debug('We have no distributions for %s that satisfies %r.',
                          req.project_name, str(req))
Add a patched version of buildout 2.2.0 for development with nix Without this patch buildout will copy eggs from the nix store into the ./eggs directory and then try to compile them. This fails because they are read only. This patch changes the behaviour to create symlinks to eggs available in the nix store instead of copying them, and not to try to compile the eggs in the store. To differentiate this from the default buildout (which may be provided otherwise e.g. as a dependency) the executable is renamed to buildout-nix. This can be used in conjuntion with myEnvFun to create development environments which make use of the python modules available in the store while downloading any additional required eggs. A pleasant side effect is that you can conveniently replace the symlink with a copy for debugging purposes. 2013-08-27 23:26:06 +01:00			`--- a/src/zc/buildout/easy_install.py 2013-08-27 22:28:40.233718116 +0200`
Bugfix: zc_buildout_nix, replace links to eggs in the store which have been gc-ed 2013-10-08 00:51:24 +01:00			`+++ b/src/zc/buildout/easy_install.py 2013-10-07 00:29:31.077413935 +0200`
zc_buildout_nix: 2.2.1 -> 2.4.0 2015-07-22 09:37:14 +01:00			`@@ -227,6 +227,12 @@`

			`def _satisfied(self, req, source=None):`
			`dists = [dist for dist in self._env[req.project_name] if dist in req]`
			`+ try:`
			`+ dists = ([dist for dist in dists`
			`+ if dist.precedence == pkg_resources.DEVELOP_DIST]`
			`+ + [pkg_resources.get_distribution(req.project_name)])`
			`+ except pkg_resources.DistributionNotFound:`
			`+ pass`
			`if not dists:`
			`logger.debug('We have no distributions for %s that satisfies %r.',`
			`req.project_name, str(req))`