bin: split `write_if_different()` out
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com> Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
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@ -28,6 +28,18 @@ def get_git_sha1():
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git_sha1 = ''
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return git_sha1
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def write_if_different(contents):
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"""
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Avoid touching the output file if it doesn't need modifications
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Useful to avoid triggering rebuilds when nothing has changed.
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"""
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if os.path.isfile(args.output):
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with open(args.output, 'r') as file:
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if file.read() == contents:
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return
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with open(args.output, 'w') as file:
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file.write(contents)
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parser = argparse.ArgumentParser()
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parser.add_argument('--output', help='File to write the #define in',
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required=True)
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@ -39,11 +51,6 @@ if git_sha1:
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'..', 'src', 'git_sha1.h.in')
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with open(git_sha1_h_in_path, 'r') as git_sha1_h_in:
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new_sha1 = git_sha1_h_in.read().replace('@VCS_TAG@', git_sha1)
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if os.path.isfile(args.output):
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with open(args.output, 'r') as git_sha1_h:
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if git_sha1_h.read() == new_sha1:
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quit()
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with open(args.output, 'w') as git_sha1_h:
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git_sha1_h.write(new_sha1)
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write_if_different(new_sha1)
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else:
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open(args.output, 'w').close()
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write_if_different('')
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