tjh.dev
1Without this patch `virtualenv --python=python2.7 .` fails with an
2error because it notices that the python readline.so is not in the
3same path as python2.7. I assume this is to avoid copying the wrong
4file on systems where it is possible to find incompatible libraries by
5accident. Adding "/nix/store" to the prefix fixes this problem.
6
7A sitecustomize.py is created in the virtualenv which makes libraries
8from the python specified by the --python argument available to the
9virtualenv. For example, this makes readline and sqlite3 available
10when a wrapped python is specified. If no --python argument is passed,
11it will only add the path to the python used when building
12`virtualenv`, which is the unwrapped python, so sqlite3 won't be
13available.
14
15
16diff --git a/virtualenv.py b/virtualenv.py
17index bcf3225..3530997 100755
18--- a/virtualenv.py
19+++ b/virtualenv.py
20@@ -1163,20 +1163,7 @@ def path_locations(home_dir, dry_run=False):
21
22
23 def change_prefix(filename, dst_prefix):
24- prefixes = [sys.prefix]
25-
26- if IS_DARWIN:
27- prefixes.extend(
28- (
29- os.path.join("/Library/Python", VERSION, "site-packages"),
30- os.path.join(sys.prefix, "Extras", "lib", "python"),
31- os.path.join("~", "Library", "Python", VERSION, "site-packages"),
32- # Python 2.6 no-frameworks
33- os.path.join("~", ".local", "lib", "python", VERSION, "site-packages"),
34- # System Python 2.7 on OSX Mountain Lion
35- os.path.join("~", "Library", "Python", VERSION, "lib", "python", "site-packages"),
36- )
37- )
38+ prefixes = ["/nix/store", sys.prefix]
39
40 if hasattr(sys, "real_prefix"):
41 prefixes.append(sys.real_prefix)
42@@ -1199,6 +1186,8 @@ def change_prefix(filename, dst_prefix):
43 if src_prefix != os.sep: # sys.prefix == "/"
44 assert relative_path[0] == os.sep
45 relative_path = relative_path[1:]
46+ if src_prefix == "/nix/store":
47+ relative_path = "/".join(relative_path.split("/")[1:])
48 return join(dst_prefix, relative_path)
49 assert False, "Filename {} does not start with any of these prefixes: {}".format(filename, prefixes)
50
51@@ -1375,6 +1364,11 @@ def install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages, clear, sy
52 site_filename_dst = change_prefix(site_filename, home_dir)
53 site_dir = os.path.dirname(site_filename_dst)
54 writefile(site_filename_dst, SITE_PY)
55+ wrapper_path = join(prefix, "lib", PY_VERSION, "site-packages")
56+ writefile(
57+ join(site_dir, 'sitecustomize.py',),
58+ "import sys; sys.path.append('%s')" % wrapper_path
59+ )
60 writefile(join(site_dir, "orig-prefix.txt"), prefix)
61 site_packages_filename = join(site_dir, "no-global-site-packages.txt")
62 if not site_packages: