Mercurial > hg
comparison mercurial/dirstateutils/timestamp.py @ 48260:269ff8978086
dirstate: store mtimes with nanosecond precision in memory
Keep integer seconds since the Unix epoch,
together with integer nanoseconds in the `0 <= n < 1e9` range.
For now, nanoseconds are still always zero.
This commit is about data structure changes.
Differential Revision: https://phab.mercurial-scm.org/D11684
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 18 Oct 2021 11:23:07 +0200 |
parents | |
children | 68bb472aee9c |
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48259:84f6b0c41b90 | 48260:269ff8978086 |
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1 # Copyright Mercurial Contributors | |
2 # | |
3 # This software may be used and distributed according to the terms of the | |
4 # GNU General Public License version 2 or any later version. | |
5 | |
6 from __future__ import absolute_import | |
7 | |
8 import stat | |
9 | |
10 | |
11 rangemask = 0x7FFFFFFF | |
12 | |
13 | |
14 class timestamp(tuple): | |
15 """ | |
16 A Unix timestamp with nanoseconds precision, | |
17 modulo 2**31 seconds. | |
18 | |
19 A 2-tuple containing: | |
20 | |
21 `truncated_seconds`: seconds since the Unix epoch, | |
22 truncated to its lower 31 bits | |
23 | |
24 `subsecond_nanoseconds`: number of nanoseconds since `truncated_seconds`. | |
25 """ | |
26 | |
27 def __new__(cls, value): | |
28 truncated_seconds, subsec_nanos = value | |
29 value = (truncated_seconds & rangemask, subsec_nanos) | |
30 return super(timestamp, cls).__new__(cls, value) | |
31 | |
32 | |
33 def zero(): | |
34 """ | |
35 Returns the `timestamp` at the Unix epoch. | |
36 """ | |
37 return tuple.__new__(timestamp, (0, 0)) | |
38 | |
39 | |
40 def mtime_of(stat_result): | |
41 """ | |
42 Takes an `os.stat_result`-like object and returns a `timestamp` object | |
43 for its modification time. | |
44 """ | |
45 # https://docs.python.org/2/library/os.html#os.stat_float_times | |
46 # "For compatibility with older Python versions, | |
47 # accessing stat_result as a tuple always returns integers." | |
48 secs = stat_result[stat.ST_MTIME] | |
49 | |
50 # For now | |
51 subsec_nanos = 0 | |
52 | |
53 return timestamp((secs, subsec_nanos)) |