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-rw-r--r--gnu/packages/aux-files/python/sitecustomize.py22
1 files changed, 16 insertions, 6 deletions
diff --git a/gnu/packages/aux-files/python/sitecustomize.py b/gnu/packages/aux-files/python/sitecustomize.py
index 71e328b9ac..e2348e0356 100644
--- a/gnu/packages/aux-files/python/sitecustomize.py
+++ b/gnu/packages/aux-files/python/sitecustomize.py
@@ -18,6 +18,7 @@
# along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
import os
+import site
import sys
# Commentary:
@@ -47,9 +48,18 @@ all_sites_norm = [os.path.normpath(p) for p in all_sites_raw]
matching_sites = [p for p in all_sites_norm
if p.endswith(site_packages_prefix)]
-# Insert sites matching the current version into sys.path, right before
-# Python's own site. This way, the user can override the libraries provided
-# by Python itself.
-sys_path_absolute = [os.path.realpath(p) for p in sys.path]
-index = sys_path_absolute.index(python_site)
-sys.path[index:index] = matching_sites
+if matching_sites:
+ # Deduplicate the entries, append them to sys.path, and handle any
+ # .pth files they contain.
+ for s in matching_sites:
+ site.addsitedir(s)
+
+ # Move the entries that were appended to sys.path in front of
+ # Python's own site-packages directory. This enables Guix
+ # packages to override Python's bundled packages, such as 'pip'.
+ python_site_index = sys.path.index(python_site)
+ new_site_start_index = sys.path.index(matching_sites[0])
+ if python_site_index < new_site_start_index:
+ sys.path = (sys.path[:python_site_index]
+ + sys.path[new_site_start_index:]
+ + sys.path[python_site_index:new_site_start_index])