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.
A sitecustomize.py is created in the virtualenv which makes libraries
from the python specified by the --python argument available to the
virtualenv. For example, this makes readline and sqlite3 available
when a wrapped python is specified. If no --python argument is passed,
it will only add the path to the python used when building
`virtualenv`, which is the unwrapped python, so sqlite3 won't be
available.
diff --git a/virtualenv.py b/virtualenv.py
index bcf3225..3530997 100755
--- a/virtualenv.py
+++ b/virtualenv.py
@@ -1163,20 +1163,7 @@ def path_locations(home_dir, dry_run=False):
def change_prefix(filename, dst_prefix):
- prefixes = [sys.prefix]
-
- if IS_DARWIN:
- prefixes.extend(
- (
- os.path.join("/Library/Python", VERSION, "site-packages"),
- os.path.join(sys.prefix, "Extras", "lib", "python"),
- os.path.join("~", "Library", "Python", VERSION, "site-packages"),
- # Python 2.6 no-frameworks
- os.path.join("~", ".local", "lib", "python", VERSION, "site-packages"),
- # System Python 2.7 on OSX Mountain Lion
- os.path.join("~", "Library", "Python", VERSION, "lib", "python", "site-packages"),
- )
- )
+ prefixes = ["/nix/store", sys.prefix]
if hasattr(sys, "real_prefix"):
prefixes.append(sys.real_prefix)
@@ -1199,6 +1186,8 @@ def change_prefix(filename, dst_prefix):
if src_prefix != os.sep: # sys.prefix == "/"
assert relative_path[0] == os.sep
relative_path = relative_path[1:]
+ if src_prefix == "/nix/store":
+ relative_path = "/".join(relative_path.split("/")[1:])
return join(dst_prefix, relative_path)
assert False, "Filename {} does not start with any of these prefixes: {}".format(filename, prefixes)
@@ -1375,6 +1364,11 @@ def install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages, clear, sy
site_filename_dst = change_prefix(site_filename, home_dir)
site_dir = os.path.dirname(site_filename_dst)
writefile(site_filename_dst, SITE_PY)
+ wrapper_path = join(prefix, "lib", PY_VERSION, "site-packages")
+ writefile(
+ join(site_dir, 'sitecustomize.py',),
+ "import sys; sys.path.append('%s')" % wrapper_path
+ )
writefile(join(site_dir, "orig-prefix.txt"), prefix)
site_packages_filename = join(site_dir, "no-global-site-packages.txt")
if not site_packages: