Display where pip is looking for packages (#4483)

Display where PackageFinder is looking for packages

news/4483.feature

@@ -0,0 +1 @@
+pip now displays where it is looking for packages, if non-default locations are used.

pip/index.py

@@ -27,6 +27,7 @@ from pip.exceptions import (
     BestVersionAlreadyInstalled, DistributionNotFound, InvalidWheelFilename,
     UnsupportedWheel
 )
+from pip.models import PyPI
 from pip.pep425tags import get_supported
 from pip.utils import (
     ARCHIVE_EXTENSIONS, SUPPORTED_EXTENSIONS, cached_property, normalize_path,
@@ -188,6 +189,18 @@ class PackageFinder(object):
                     )
                     break
 
+    def get_formatted_locations(self):
+        lines = []
+        if self.index_urls and self.index_urls != [PyPI.simple_url]:
+            lines.append(
+                "Looking in indexes: {}".format(", ".join(self.index_urls))
+            )
+        if self.find_links:
+            lines.append(
+                "Looking in links: {}".format(", ".join(self.find_links))
+            )
+        return "\n".join(lines)
+
     def add_dependency_links(self, links):
         # # FIXME: this shouldn't be global list this, it should only
         # # apply to requirements of the package that specifies the

pip/resolve.py

@@ -154,6 +154,11 @@ class Resolver(object):
             any(req.has_hash_options for req in root_reqs)
         )
 
+        # Display where finder is looking for packages
+        locations = self.finder.get_formatted_locations()
+        if locations:
+            logger.info(locations)
+
         # Actually prepare the files, and collect any exceptions. Most hash
         # exceptions cannot be checked ahead of time, because
         # req.populate_link() needs to be called before we can make decisions

tests/functional/test_install.py

@@ -114,6 +114,10 @@ def test_install_from_pypi(script):
     assert egg_info_folder in result.files_created, str(result)
     assert initools_folder in result.files_created, str(result)
 
+    # Should not display where it's looking for files
+    assert "Looking in indexes: " not in result.stdout
+    assert "Looking in links: " not in result.stdout
+
 
 def test_editable_install(script):
     """
@@ -633,6 +637,10 @@ def test_install_package_with_root(script, data):
     )
     assert root_path in result.files_created, str(result)
 
+    # Should show find-links location in output
+    assert "Looking in indexes: " not in result.stdout
+    assert "Looking in links: " in result.stdout
+
 
 def test_install_package_with_prefix(script, data):
     """
@@ -809,6 +817,10 @@ def test_url_incorrect_case_file_index(script, data):
     egg_folder = script.site_packages / 'Dinner-2.0-py%s.egg-info' % pyversion
     assert egg_folder in result.files_created, str(result)
 
+    # Should show index-url location in output
+    assert "Looking in indexes: " in result.stdout
+    assert "Looking in links: " not in result.stdout
+
 
 @pytest.mark.network
 def test_compiles_pyc(script):