Adds a generated file with the dawn git hash encoded at build time.
Bug: dawn:549
Change-Id: I5d6306f33b7ad2247ee75a0c5387a2bc6fac0497
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/83901
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Loko Kung <lokokung@google.com>
diff --git a/generator/dawn_version_generator.py b/generator/dawn_version_generator.py
new file mode 100644
index 0000000..462cb31
--- /dev/null
+++ b/generator/dawn_version_generator.py
@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+# Copyright 2022 The Dawn Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os, subprocess, sys
+
+from generator_lib import Generator, run_generator, FileRender
+
+
+def get_git():
+ return 'git.bat' if sys.platform == 'win32' else 'git'
+
+
+def get_gitHash(dawnDir):
+ result = subprocess.run([get_git(), 'rev-parse', 'HEAD'],
+ stdout=subprocess.PIPE,
+ cwd=dawnDir)
+ if result.returncode == 0:
+ return result.stdout.decode('utf-8').strip()
+ return ''
+
+
+def get_gitHead(dawnDir):
+ return [os.path.join(dawnDir, '.git', 'HEAD')]
+
+
+def unpackGitRef(packed, resolved):
+ with open(packed) as fin:
+ refs = fin.read().strip().split('\n')
+
+ # Strip comments
+ refs = [ref.split(' ') for ref in refs if ref.strip()[0] != '#']
+
+ # Parse results which are in the format [<gitHash>, <refFile>] from previous step.
+ refs = [gitHash for (gitHash, refFile) in refs if refFile == resolved]
+ if len(refs) == 1:
+ with open(resolved, 'w') as fout:
+ fout.write(refs[0] + '\n')
+ return True
+ return False
+
+
+def get_gitResolvedHead(dawnDir):
+ result = subprocess.run(
+ [get_git(), 'rev-parse', '--symbolic-full-name', 'HEAD'],
+ stdout=subprocess.PIPE,
+ cwd=dawnDir)
+ if result.returncode != 0:
+ raise Exception('Failed to execute git rev-parse to resolve git head.')
+
+ resolved = os.path.join(dawnDir, '.git',
+ result.stdout.decode('utf-8').strip())
+
+ # Check a packed-refs file exists. If so, we need to potentially unpack and include it as a dep.
+ packed = os.path.join(dawnDir, '.git', 'packed-refs')
+ if os.path.exists(packed) and unpackGitRef(packed, resolved):
+ return [packed, resolved]
+
+ if not os.path.exists(resolved):
+ raise Exception('Unable to resolve git HEAD hash file:', path)
+ return [resolved]
+
+
+def compute_params(args):
+ return {
+ 'get_gitHash': lambda: get_gitHash(os.path.abspath(args.dawn_dir)),
+ }
+
+
+class DawnVersionGenerator(Generator):
+ def get_description(self):
+ return 'Generates version dependent Dawn code. Currently regenerated dependent on git hash.'
+
+ def add_commandline_arguments(self, parser):
+ parser.add_argument('--dawn-dir',
+ required=True,
+ type=str,
+ help='The Dawn root directory path to use')
+
+ def get_dependencies(self, args):
+ dawn_dir = os.path.abspath(args.dawn_dir)
+ return get_gitHead(dawn_dir) + get_gitResolvedHead(dawn_dir)
+
+ def get_file_renders(self, args):
+ params = compute_params(args)
+
+ return [
+ FileRender('dawn/common/Version.h',
+ 'src/dawn/common/Version_autogen.h', [params]),
+ ]
+
+
+if __name__ == '__main__':
+ sys.exit(run_generator(DawnVersionGenerator()))
