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Size reports: add a script to streamline workflows (#12299)
#### Problem Workflow files have become cluttered with copy-pasted setup for size reports. #### Change overview Encapsulate the setup in a script, `gh_sizes_environment.py`. #### Testing Script checked manually, but confirmation for Github integration can only come from live CI.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| #!/usr/bin/env python3 | ||
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| """ | ||
| Set up environment variables used to generate size report artifacts. | ||
| Takes a single argument, a JSON dictionary of the `github` context. | ||
| Typically run as: | ||
| ``` | ||
| - name: Set up environment for size reports | ||
| env: | ||
| GH_CONTEXT: ${{ toJson(github) }} | ||
| run: gh_sizes_environment.py "${GH_CONTEXT}" | ||
| ``` | ||
| Sets the following environment variables: | ||
| - `GH_EVENT_PR` For a pull request, the PR number; otherwise 0. | ||
| - `GH_EVENT_HASH` SHA of the commit under test. | ||
| - `GH_EVENT_PARENT` SHA of the parent commit to which the commit under | ||
| test is applied. | ||
| """ | ||
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| import json | ||
| import os | ||
| import re | ||
| import subprocess | ||
| import sys | ||
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| github = json.loads(sys.argv[1]) | ||
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| if github['event_name'] == 'pull_request': | ||
| pr = github['event']['number'] | ||
| commit = github['event']['pull_request']['head']['sha'] | ||
| r = subprocess.run(['git', 'show', '--no-patch', '--format=%s', 'HEAD'], | ||
| capture_output=True, text=True, check=True) | ||
| m = re.fullmatch('Merge [0-9a-f]+ into ([0-9a-f]+)', r.stdout) | ||
| if m: | ||
| parent = m.group(1) | ||
| else: | ||
| parent = github['event']['pull_request']['base']['sha'] | ||
| else: | ||
| pr = 0 | ||
| commit = github['sha'] | ||
| parent = github['event']['before'] | ||
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| # Environment variables for subsequent workflow steps are set by | ||
| # writing to the file named by `$GITHUB_ENV`. | ||
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| env = os.environ.get('GITHUB_ENV') | ||
| assert env | ||
| with open(env, 'at') as out: | ||
| print(f'GH_EVENT_PR={pr}', file=out) | ||
| print(f'GH_EVENT_HASH={commit}', file=out) | ||
| print(f'GH_EVENT_PARENT={parent}', file=out) |