util: Add 'obtain-resource.py' utility

This can be used to obtain a resource from gem5-resources.

Change-Id: I922d78ae0450bf011f18893ffc05cb1ad6c97572

util/obtain-resource.py

@@ -0,0 +1,87 @@
+# Copyright (c) 2023 The Regents of the University of California
+# All Rights Reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""
+Obtain a resource from gem5 resource.
+
+Usage
+-----
+
+```sh
+scons build/ALL/gem5.opt -j$(nproc)
+build/ALL/gem5.opt util/obtain-resource.py <resource_id> [-p <path>] [-q]
+# Example:
+# `build/ALL/gem5.opt util/obtain-resource.py arm-hello64-static -p arm-hello`
+# This will download the resource with id `arm-hello64-static` to the
+# "arm-hello" in the CWD.
+```
+"""
+
+if __name__ == "__m5_main__":
+    from gem5.resources.resource import obtain_resource
+    import argparse
+
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "id",
+        type=str,
+        help="The resource id to download.",
+    )
+
+    parser.add_argument(
+        "-p",
+        "--path",
+        type=str,
+        required=False,
+        help="The path the resource is to be downloaded to. If not specified, "
+        "the resource will be downloaded to the default location in the "
+        "gem5 local cache of resources",
+    )
+
+    parser.add_argument(
+        "-q",
+        "--quiet",
+        action="store_true",
+        default=False,
+        help="Suppress output.",
+    )
+
+    args = parser.parse_args()
+
+    resource = obtain_resource(
+        resource_id=args.id,
+        quiet=args.quiet,
+        to_path=args.path,
+    )
+
+    if not args.quiet:
+        print(f"Resource at: '" + str(resource.get_local_path()) + "'")
+
+    exit(0)
+
+print("Error: This script is meant to be run with the gem5 binary")
+exit(1)