[FIX] Make package resolve request respect case sensitivity -- Windows

src/rez/utils/filesystem.py

@@ -16,6 +16,7 @@
 import os
 import re
 import stat
+import platform
 
 
 class TempDirs(object):
@@ -124,6 +125,23 @@ def retain_cwd():
     finally:
         os.chdir(cwd)
 
+def get_case_canonical_path(path):
+    """Get the packages path in the canonical case.
+
+    Paths on windows are case-insensitive therefore the filesystem package repo
+    filepath should be lower()ed on windows so that stuff like the unique repo identifier,
+    and the local path that gets stored into variant handles, doesn't differ.
+
+    Args:
+        path (str): Packages path to convert the case.
+
+    Returns:
+        str: The packages path in the canonical case form (always lowered).
+    """
+    if "Windows" in platform.system():
+        return path.lower()
+    else:
+        return path
 
 def get_existing_path(path, topmost_path=None):
     """Get the longest parent path in `path` that exists.

src/rezplugins/package_repository/filesystem.py

@@ -7,6 +7,7 @@
 import stat
 import errno
 import time
+import platform
 
 from rez.package_repository import PackageRepository
 from rez.package_resources_ import PackageFamilyResource, VariantResourceHelper, \
@@ -20,7 +21,7 @@
 from rez.utils.resources import cached_property
 from rez.utils.logging_ import print_warning
 from rez.utils.memcached import memcached, pool_memcached_connections
-from rez.utils.filesystem import make_path_writable
+from rez.utils.filesystem import make_path_writable, get_case_canonical_path
 from rez.serialise import load_from_file, FileFormat
 from rez.config import config
 from rez.backport.lru_cache import lru_cache
@@ -461,6 +462,7 @@ def __init__(self, location, resource_pool):
         Args:
             location (str): Path containing the package repository.
         """
+        location = get_case_canonical_path(location)
         super(FileSystemPackageRepository, self).__init__(location, resource_pool)
 
         global _settings
@@ -785,6 +787,9 @@ def _get_families(self):
     def _get_family(self, name):
         is_valid_package_name(name, raise_error=True)
         if os.path.isdir(os.path.join(self.location, name)):
+            # force case-sensitive match on pkg family, on case-insensitive platforms
+            if "Windows" in platform.system() and name not in os.listdir(self.location):
+                return None
             family = self.get_resource(
                 FileSystemPackageFamilyResource.key,
                 location=self.location,