Fix/export case insensitive

conans/client/cmd/export.py

@@ -461,7 +461,7 @@ def export_source(conanfile, origin_folder, destination_source_folder):
     included_sources, excluded_sources = _classify_patterns(conanfile.exports_sources)
     copier = FileCopier([origin_folder], destination_source_folder)
     for pattern in included_sources:
-        copier(pattern, links=True, excludes=excluded_sources)
+        copier(pattern, links=True, excludes=excluded_sources, ignore_case=False)
     output = conanfile.output
     package_output = ScopedOutput("%s exports_sources" % output.scope, output)
     copier.report(package_output)
@@ -494,7 +494,7 @@ def export_recipe(conanfile, origin_folder, destination_folder):
 
     copier = FileCopier([origin_folder], destination_folder)
     for pattern in included_exports:
-        copier(pattern, links=True, excludes=excluded_exports)
+        copier(pattern, links=True, excludes=excluded_exports, ignore_case=False)
     copier.report(package_output)
 
     _run_method(conanfile, "export", origin_folder, destination_folder, output)

conans/test/functional/command/export/export_test.py

@@ -1,4 +1,5 @@
 import os
+import platform
 import stat
 import textwrap
 import unittest
@@ -462,3 +463,33 @@ def test_export_conflict_no_user_channel(self):
         self.assertIn("pkg/0.1: A new conanfile.py version was exported", client.out)
         client.run('export . Pkg/0.1@', assert_error=True)
         self.assertIn("ERROR: Cannot export package with same name but different case", client.out)
+
+
+@pytest.mark.skipif(platform.system() != "Linux", reason="Needs case-sensitive filesystem")
+def test_export_casing():
+    # https://github.com/conan-io/conan/issues/8583
+    client = TestClient()
+    conanfile = textwrap.dedent("""
+        from conans import ConanFile
+        class Pkg(ConanFile):
+            exports = "file1", "FILE1"
+            exports_sources = "test", "TEST"
+        """)
+    client.save({"conanfile.py": conanfile,
+                 "test": "some lowercase",
+                 "TEST": "some UPPERCASE",
+                 "file1": "file1 lowercase",
+                 "FILE1": "file1 UPPERCASE"
+                 })
+    assert client.load("test") == "some lowercase"
+    assert client.load("TEST") == "some UPPERCASE"
+    assert client.load("file1") == "file1 lowercase"
+    assert client.load("FILE1") == "file1 UPPERCASE"
+    client.run("export . pkg/0.1@")
+    ref = ConanFileReference.loads("pkg/0.1@")
+    export_src_folder = client.cache.package_layout(ref).export_sources()
+    assert load(os.path.join(export_src_folder, "test")) == "some lowercase"
+    assert load(os.path.join(export_src_folder, "TEST")) == "some UPPERCASE"
+    exports_folder = client.cache.package_layout(ref).export()
+    assert load(os.path.join(exports_folder, "file1")) == "file1 lowercase"
+    assert load(os.path.join(exports_folder, "FILE1")) == "file1 UPPERCASE"