Run fuzzers on macOS arm64 (#67297)

eng/pipelines/coreclr/exploratory.yml

@@ -22,13 +22,13 @@ jobs:
     buildConfig: checked
     platforms:
     # Linux tests are built on the OSX machines.
-    # - OSX_x64
     - Linux_arm
     - Linux_arm64
     - Linux_x64
     - windows_x64
     - windows_x86
     - windows_arm64
+    - OSX_arm64
     - CoreClrTestBuildHost # Either OSX_x64 or Linux_x64
     jobParameters:
       testGroup: outerloop
@@ -39,13 +39,13 @@ jobs:
     buildConfig: checked
     platforms:
     # Linux tests are built on the OSX machines.
-    # - OSX_x64
     - Linux_arm
     - Linux_arm64
     - Linux_x64
     - windows_x64
     - windows_x86
     - windows_arm64
+    - OSX_arm64
     helixQueueGroup: ci
     helixQueuesTemplate: /eng/pipelines/coreclr/templates/helix-queues-setup.yml
     jobParameters:

src/coreclr/scripts/fuzzer_setup.py

@@ -79,7 +79,10 @@ def main(main_args):
 
     coreclr_args = setup_args(main_args)
     arch_name = coreclr_args.arch
-    os_name = "win" if coreclr_args.platform.lower() == "windows" else "linux"
+    os_name = coreclr_args.platform.lower()
+    if os_name == "windows":
+        os_name = "win"
+
     run_configuration = "{}-{}".format(os_name, arch_name)
     source_directory = coreclr_args.source_directory
 
@@ -109,7 +112,7 @@ def main(main_args):
         acceptable_copy = lambda path: any(path.endswith(extension) for extension in [".py", ".dll", ".exe", ".json"])
     else:
         # Need to accept files without any extension, which is how executable file's names look.
-        acceptable_copy = lambda path: (os.path.basename(path).find(".") == -1) or any(path.endswith(extension) for extension in [".py", ".dll", ".so", ".json", ".a"])
+        acceptable_copy = lambda path: (os.path.basename(path).find(".") == -1) or any(path.endswith(extension) for extension in [".py", ".dll", ".so", ".dylib", ".json", ".a"])
 
     # copy CORE_ROOT
     print('Copying {} -> {}'.format(coreclr_args.core_root_directory, coreroot_directory))
@@ -140,7 +143,7 @@ def main(main_args):
     except PermissionError as pe:
         print("Skipping file. Got error: %s", pe)
 
-    # create foo.txt in work_item directories
+    # create a dummy file in the work_item directories, otherwise Helix complains
     workitem_directory = path.join(source_directory, "workitem")
     os.mkdir(workitem_directory)
     foo_txt = os.path.join(workitem_directory, "foo.txt")