tests/svn-safe-append.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Fri, 15 Mar 2024 01:31:57 +0100
branchstable
changeset 51505 c9ceb4f60256
parent 48875 6000f5b25c9b
permissions -rwxr-xr-x
phases: avoid N² behavior in `advanceboundary` We allowed duplicated entries in the deque, which each entry could potentially insert all its ancestors. So advancing boundary for the full repository would mean each revision would walk all its ancestors, resulting in O(N²) iteration. For repository of any decent size, N² is quickly insane. We introduce a simple set to avoid this and get back to reasonable performance.
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#!/usr/bin/env python3
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__doc__ = """Same as `echo a >> b`, but ensures a changed mtime of b.
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Without this svn will not detect workspace changes."""
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import os
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import stat
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import sys
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if sys.version_info[0] >= 3:
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    text = os.fsencode(sys.argv[1])
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    fname = os.fsencode(sys.argv[2])
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else:
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    text = sys.argv[1]
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    fname = sys.argv[2]
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f = open(fname, "ab")
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try:
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    before = os.fstat(f.fileno())[stat.ST_MTIME]
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    f.write(text)
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    f.write(b"\n")
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finally:
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    f.close()
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inc = 1
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now = os.stat(fname)[stat.ST_MTIME]
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while now == before:
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    t = now + inc
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    inc += 1
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    os.utime(fname, (t, t))
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    now = os.stat(fname)[stat.ST_MTIME]