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nixpkgs/pkgs/development/python-modules/virtualenv-change-prefix.patch

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Without this patch `virtualenv --python=python2.7 .` fails with an error because it notices that the python readline.so is not in the same path as python2.7. I assume this is to avoid copying the wrong file on systems where it is possible to find incompatible libraries by accident. Adding "/nix/store" to the prefix fixes this problem. Unfortunately readline is still not available if you just run `virtualenv .`.
--- virtualenv-1.6.4/virtualenv.py 2012-05-20 00:40:38.070649647 +0200
+++ virtualenv-1.6.4/virtualenv.py 2012-05-20 00:45:10.596242604 +0200
@@ -951,13 +951,7 @@
def change_prefix(filename, dst_prefix):
- prefixes = [sys.prefix]
-
- if sys.platform == "darwin":
- prefixes.extend((
- os.path.join("/Library/Python", sys.version[:3], "site-packages"),
- os.path.join(sys.prefix, "Extras", "lib", "python"),
- os.path.join("~", "Library", "Python", sys.version[:3], "site-packages")))
+ prefixes = ["/nix/store", sys.prefix]
if hasattr(sys, 'real_prefix'):
prefixes.append(sys.real_prefix)
@@ -968,6 +962,8 @@
_, relpath = filename.split(src_prefix, 1)
assert relpath[0] == os.sep
relpath = relpath[1:]
+ if src_prefix == "/nix/store":
+ relpath = "/".join(relpath.split("/")[1:])
return join(dst_prefix, relpath)
assert False, "Filename %s does not start with any of these prefixes: %s" % \
(filename, prefixes)