Mercurial > hg
view tests/svn-safe-append.py @ 50242:379a78001d8e stable
dirstate: set identity whenever we read the dirstate's v2 docket
The docket can be loaded outside of a full read (for exemple when
pre-fetching parents), so the current code would read/set the identity
after loading the data, opening a race condition:
A0: first process docket is read
B0: other process appends new data to the dirstate (and changes the docket)
A1: first process sets the identity (based on pre-B content, but with post-B identity)
A1: first process loads the dirstatemap from the data file
A1: first process does not detect the race and overwrites the update from B.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 01 Mar 2023 02:38:20 +0100 |
parents | 6000f5b25c9b |
children |
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#!/usr/bin/env python3 __doc__ = """Same as `echo a >> b`, but ensures a changed mtime of b. Without this svn will not detect workspace changes.""" import os import stat import sys if sys.version_info[0] >= 3: text = os.fsencode(sys.argv[1]) fname = os.fsencode(sys.argv[2]) else: text = sys.argv[1] fname = sys.argv[2] f = open(fname, "ab") try: before = os.fstat(f.fileno())[stat.ST_MTIME] f.write(text) f.write(b"\n") finally: f.close() inc = 1 now = os.stat(fname)[stat.ST_MTIME] while now == before: t = now + inc inc += 1 os.utime(fname, (t, t)) now = os.stat(fname)[stat.ST_MTIME]