Mercurial > hg
annotate mercurial/vfs.py @ 46149:294d5aca4ff5
copies: iterate over children directly (instead of parents)
Before this change we would gather all parent → child edges and iterate on
all parent, gathering copy information for children and aggregating them from
there.
They are not strict requirement for edges to be processed in that specific
order. We could also simply iterate over all "children" revision and aggregate
data from both parents at the same time. This patch does that.
It make various things simpler:
* since both parents are processed at the same time, we no longer need to
cache data for merge (see next changeset for details),
* we no longer need nested loop to process data,
* we no longer need to store partial merge data for a rev from distinct loop
interaction to another when processing merges,
* we no longer need to build a full parent -> children mapping (we only rely on
a simpler "parent -> number of children" map (for memory efficiency),
* the data access pattern is now simpler (from lower revisions to higher
revisions) and entirely predicable. That predictability open the way to
prefetching and parallel processing.
So that new iterations order requires simpler code and open the way to
interesting optimisation.
The effect on performance is quite good. In the worse case, we don't see any
significant negative impact. And in the best case, the reduction of roundtrip
to Python provide us with a significant speed. Some example below:
Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev
---------------------------------------------------------------------------------------------------------------------------------------------------------------
mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 34414 revs, 0.962867 s, 0.502584 s, -0.460283 s, × 0.5220, 14 µs/rev
mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 8598 revs, 0.110717 s, 0.076323 s, -0.034394 s, × 0.6894, 8 µs/rev
# full comparison between the previous changeset and this one
Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev
---------------------------------------------------------------------------------------------------------------------------------------------------------------
mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 1 revs, 0.000048 s, 0.000041 s, -0.000007 s, × 0.8542, 41 µs/rev
mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 6 revs, 0.000153 s, 0.000102 s, -0.000051 s, × 0.6667, 17 µs/rev
mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 1032 revs, 0.004209 s, 0.004254 s, +0.000045 s, × 1.0107, 4 µs/rev
pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 9 revs, 0.000203 s, 0.000282 s, +0.000079 s, × 1.3892, 31 µs/rev
pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 1 revs, 0.000059 s, 0.000048 s, -0.000011 s, × 0.8136, 48 µs/rev
pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 7 revs, 0.000194 s, 0.000211 s, +0.000017 s, × 1.0876, 30 µs/rev
pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 1 revs, 0.000380 s, 0.000375 s, -0.000005 s, × 0.9868, 375 µs/rev
pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 6 revs, 0.010588 s, 0.010574 s, -0.000014 s, × 0.9987, 1762 µs/rev
pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 4785 revs, 0.048961 s, 0.049974 s, +0.001013 s, × 1.0207, 10 µs/rev
pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 6780 revs, 0.083612 s, 0.084300 s, +0.000688 s, × 1.0082, 12 µs/rev
pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 5441 revs, 0.058579 s, 0.060128 s, +0.001549 s, × 1.0264, 11 µs/rev
pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 43645 revs, 0.736783 s, 0.686542 s, -0.050241 s, × 0.9318, 15 µs/rev
pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 2 revs, 0.022050 s, 0.009277 s, -0.012773 s, × 0.4207, 4638 µs/rev
pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 11316 revs, 0.120800 s, 0.114733 s, -0.006067 s, × 0.9498, 10 µs/rev
netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 2 revs, 0.000140 s, 0.000081 s, -0.000059 s, × 0.5786, 40 µs/rev
netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 2 revs, 0.000114 s, 0.000107 s, -0.000007 s, × 0.9386, 53 µs/rev
netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 3 revs, 0.000224 s, 0.000173 s, -0.000051 s, × 0.7723, 57 µs/rev
netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 9 revs, 0.000723 s, 0.000698 s, -0.000025 s, × 0.9654, 77 µs/rev
netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 1421 revs, 0.009665 s, 0.009248 s, -0.000417 s, × 0.9569, 6 µs/rev
netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 1533 revs, 0.014820 s, 0.015446 s, +0.000626 s, × 1.0422, 10 µs/rev
netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 5750 revs, 0.076049 s, 0.074373 s, -0.001676 s, × 0.9780, 12 µs/rev
netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 66949 revs, 0.683603 s, 0.639870 s, -0.043733 s, × 0.9360, 9 µs/rev
mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 2 revs, 0.000161 s, 0.000088 s, -0.000073 s, × 0.5466, 44 µs/rev
mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 8 revs, 0.000234 s, 0.000199 s, -0.000035 s, × 0.8504, 24 µs/rev
mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 9 revs, 0.000247 s, 0.000171 s, -0.000076 s, × 0.6923, 19 µs/rev
mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 7 revs, 0.000630 s, 0.000592 s, -0.000038 s, × 0.9397, 84 µs/rev
mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 3 revs, 0.003286 s, 0.003151 s, -0.000135 s, × 0.9589, 1050 µs/rev
mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.062441 s, 0.061612 s, -0.000829 s, × 0.9867, 10268 µs/rev
mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.005423 s, 0.005381 s, -0.000042 s, × 0.9923, 3 µs/rev
mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.005919 s, 0.003742 s, -0.002177 s, × 0.6322, 91 µs/rev
mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 7839 revs, 0.062597 s, 0.061983 s, -0.000614 s, × 0.9902, 7 µs/rev
mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.043551 s, 0.019861 s, -0.023690 s, × 0.4560, 32 µs/rev
mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 30263 revs, 0.192475 s, 0.188101 s, -0.004374 s, × 0.9773, 6 µs/rev
mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 153721 revs, 1.955575 s, 1.806696 s, -0.148879 s, × 0.9239, 11 µs/rev
mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 204976 revs, 2.886501 s, 2.682987 s, -0.203514 s, × 0.9295, 13 µs/rev
mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 2 revs, 0.001181 s, 0.000852 s, -0.000329 s, × 0.7214, 426 µs/rev
mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 2 revs, 0.001189 s, 0.000859 s, -0.000330 s, × 0.7225, 429 µs/rev
mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 4 revs, 0.000563 s, 0.000150 s, -0.000413 s, × 0.2664, 37 µs/rev
mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 2 revs, 0.001548 s, 0.001158 s, -0.000390 s, × 0.7481, 579 µs/rev
mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1 revs, 0.027782 s, 0.027240 s, -0.000542 s, × 0.9805, 27240 µs/rev
mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.062781 s, 0.062824 s, +0.000043 s, × 1.0007, 10470 µs/rev
mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.005778 s, 0.005463 s, -0.000315 s, × 0.9455, 3 µs/rev
mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.006192 s, 0.004238 s, -0.001954 s, × 0.6844, 103 µs/rev
mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 6657 revs, 0.065391 s, 0.064113 s, -0.001278 s, × 0.9805, 9 µs/rev
mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 40314 revs, 0.317216 s, 0.294063 s, -0.023153 s, × 0.9270, 7 µs/rev
mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 38690 revs, 0.303119 s, 0.281493 s, -0.021626 s, × 0.9287, 7 µs/rev
mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 8598 revs, 0.110717 s, 0.076323 s, -0.034394 s, × 0.6894, 8 µs/rev
mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.045739 s, 0.020390 s, -0.025349 s, × 0.4458, 33 µs/rev
mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 97052 revs, 3.098021 s, 3.023879 s, -0.074142 s, × 0.9761, 31 µs/rev
mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 52031 revs, 0.771480 s, 0.735549 s, -0.035931 s, × 0.9534, 14 µs/rev
mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 363753 revs, 18.813422 s, 18.568900 s, -0.244522 s, × 0.9870, 51 µs/rev
mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 34414 revs, 0.962867 s, 0.502584 s, -0.460283 s, × 0.5220, 14 µs/rev
mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 362229 revs, 18.684923 s, 18.356645 s, -0.328278 s, × 0.9824, 50 µs/rev
mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 359344 revs, 18.296305 s, 18.250393 s, -0.045912 s, × 0.9975, 50 µs/rev
mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 192665 revs, 3.061887 s, 2.792459 s, -0.269428 s, × 0.9120, 14 µs/rev
mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 228985 revs, 103.869641 s, 107.697264 s, +3.827623 s, × 1.0369, 470 µs/rev
mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 382065 revs, 64.262957 s, 63.961040 s, -0.301917 s, × 0.9953, 167 µs/rev
Differential Revision: https://phab.mercurial-scm.org/D9422
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Mon, 14 Dec 2020 11:32:24 +0100 |
parents | 89a2afe31e82 |
children | d4ba4d51f85f |
rev | line source |
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31217
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vfs: extract 'vfs' class and related code to a new 'vfs' module (API)
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1 # vfs.py - Mercurial 'vfs' classes |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 from __future__ import absolute_import |
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8 |
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9 import contextlib |
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10 import errno |
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11 import os |
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12 import shutil |
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13 import stat |
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14 import threading |
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15 |
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16 from .i18n import _ |
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17 from .pycompat import ( |
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18 delattr, |
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19 getattr, |
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20 setattr, |
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21 ) |
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22 from . import ( |
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23 encoding, |
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24 error, |
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25 pathutil, |
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26 pycompat, |
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27 util, |
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28 ) |
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29 |
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30 |
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31 def _avoidambig(path, oldstat): |
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32 """Avoid file stat ambiguity forcibly |
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33 |
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34 This function causes copying ``path`` file, if it is owned by |
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35 another (see issue5418 and issue5584 for detail). |
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36 """ |
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37 |
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38 def checkandavoid(): |
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39 newstat = util.filestat.frompath(path) |
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40 # return whether file stat ambiguity is (already) avoided |
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41 return not newstat.isambig(oldstat) or newstat.avoidambig(path, oldstat) |
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42 |
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43 if not checkandavoid(): |
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44 # simply copy to change owner of path to get privilege to |
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45 # advance mtime (see issue5418) |
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46 util.rename(util.mktempcopy(path), path) |
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47 checkandavoid() |
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48 |
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49 |
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50 class abstractvfs(object): |
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51 """Abstract base class; cannot be instantiated""" |
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52 |
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53 def __init__(self, *args, **kwargs): |
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54 '''Prevent instantiation; don't call this from subclasses.''' |
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55 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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56 |
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57 def __call__(self, path, mode=b'rb', **kwargs): |
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58 raise NotImplementedError |
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59 |
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60 def _auditpath(self, path, mode): |
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61 raise NotImplementedError |
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62 |
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63 def join(self, path, *insidef): |
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64 raise NotImplementedError |
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65 |
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66 def tryread(self, path): |
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67 '''gracefully return an empty string for missing files''' |
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68 try: |
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69 return self.read(path) |
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70 except IOError as inst: |
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71 if inst.errno != errno.ENOENT: |
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72 raise |
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73 return b"" |
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74 |
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75 def tryreadlines(self, path, mode=b'rb'): |
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76 '''gracefully return an empty array for missing files''' |
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77 try: |
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78 return self.readlines(path, mode=mode) |
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79 except IOError as inst: |
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80 if inst.errno != errno.ENOENT: |
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81 raise |
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82 return [] |
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83 |
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84 @util.propertycache |
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85 def open(self): |
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86 """Open ``path`` file, which is relative to vfs root. |
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87 |
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88 Newly created directories are marked as "not to be indexed by |
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89 the content indexing service", if ``notindexed`` is specified |
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90 for "write" mode access. |
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91 """ |
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92 return self.__call__ |
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93 |
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94 def read(self, path): |
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95 with self(path, b'rb') as fp: |
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96 return fp.read() |
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97 |
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98 def readlines(self, path, mode=b'rb'): |
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99 with self(path, mode=mode) as fp: |
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100 return fp.readlines() |
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101 |
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102 def write(self, path, data, backgroundclose=False, **kwargs): |
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103 with self(path, b'wb', backgroundclose=backgroundclose, **kwargs) as fp: |
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104 return fp.write(data) |
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105 |
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106 def writelines(self, path, data, mode=b'wb', notindexed=False): |
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107 with self(path, mode=mode, notindexed=notindexed) as fp: |
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108 return fp.writelines(data) |
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109 |
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110 def append(self, path, data): |
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111 with self(path, b'ab') as fp: |
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112 return fp.write(data) |
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113 |
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114 def basename(self, path): |
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115 """return base element of a path (as os.path.basename would do) |
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116 |
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117 This exists to allow handling of strange encoding if needed.""" |
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118 return os.path.basename(path) |
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119 |
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120 def chmod(self, path, mode): |
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121 return os.chmod(self.join(path), mode) |
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122 |
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123 def dirname(self, path): |
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124 """return dirname element of a path (as os.path.dirname would do) |
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125 |
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126 This exists to allow handling of strange encoding if needed.""" |
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127 return os.path.dirname(path) |
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128 |
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129 def exists(self, path=None): |
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130 return os.path.exists(self.join(path)) |
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131 |
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132 def fstat(self, fp): |
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133 return util.fstat(fp) |
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134 |
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135 def isdir(self, path=None): |
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136 return os.path.isdir(self.join(path)) |
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137 |
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138 def isfile(self, path=None): |
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139 return os.path.isfile(self.join(path)) |
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140 |
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141 def islink(self, path=None): |
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142 return os.path.islink(self.join(path)) |
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143 |
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144 def isfileorlink(self, path=None): |
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145 """return whether path is a regular file or a symlink |
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146 |
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147 Unlike isfile, this doesn't follow symlinks.""" |
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148 try: |
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149 st = self.lstat(path) |
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150 except OSError: |
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151 return False |
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152 mode = st.st_mode |
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153 return stat.S_ISREG(mode) or stat.S_ISLNK(mode) |
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154 |
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155 def reljoin(self, *paths): |
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156 """join various elements of a path together (as os.path.join would do) |
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157 |
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158 The vfs base is not injected so that path stay relative. This exists |
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159 to allow handling of strange encoding if needed.""" |
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160 return os.path.join(*paths) |
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161 |
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162 def split(self, path): |
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163 """split top-most element of a path (as os.path.split would do) |
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164 |
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165 This exists to allow handling of strange encoding if needed.""" |
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166 return os.path.split(path) |
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167 |
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168 def lexists(self, path=None): |
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169 return os.path.lexists(self.join(path)) |
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170 |
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171 def lstat(self, path=None): |
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172 return os.lstat(self.join(path)) |
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173 |
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174 def listdir(self, path=None): |
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175 return os.listdir(self.join(path)) |
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176 |
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177 def makedir(self, path=None, notindexed=True): |
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178 return util.makedir(self.join(path), notindexed) |
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179 |
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180 def makedirs(self, path=None, mode=None): |
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181 return util.makedirs(self.join(path), mode) |
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182 |
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183 def makelock(self, info, path): |
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184 return util.makelock(info, self.join(path)) |
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185 |
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186 def mkdir(self, path=None): |
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187 return os.mkdir(self.join(path)) |
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188 |
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189 def mkstemp(self, suffix=b'', prefix=b'tmp', dir=None): |
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190 fd, name = pycompat.mkstemp( |
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191 suffix=suffix, prefix=prefix, dir=self.join(dir) |
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192 ) |
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193 dname, fname = util.split(name) |
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194 if dir: |
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195 return fd, os.path.join(dir, fname) |
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196 else: |
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197 return fd, fname |
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198 |
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199 def readdir(self, path=None, stat=None, skip=None): |
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200 return util.listdir(self.join(path), stat, skip) |
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201 |
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202 def readlock(self, path): |
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203 return util.readlock(self.join(path)) |
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204 |
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205 def rename(self, src, dst, checkambig=False): |
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206 """Rename from src to dst |
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207 |
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208 checkambig argument is used with util.filestat, and is useful |
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209 only if destination file is guarded by any lock |
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210 (e.g. repo.lock or repo.wlock). |
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211 |
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212 To avoid file stat ambiguity forcibly, checkambig=True involves |
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213 copying ``src`` file, if it is owned by another. Therefore, use |
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214 checkambig=True only in limited cases (see also issue5418 and |
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215 issue5584 for detail). |
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216 """ |
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217 self._auditpath(dst, b'w') |
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218 srcpath = self.join(src) |
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219 dstpath = self.join(dst) |
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220 oldstat = checkambig and util.filestat.frompath(dstpath) |
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221 if oldstat and oldstat.stat: |
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222 ret = util.rename(srcpath, dstpath) |
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223 _avoidambig(dstpath, oldstat) |
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224 return ret |
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225 return util.rename(srcpath, dstpath) |
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226 |
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227 def readlink(self, path): |
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228 return util.readlink(self.join(path)) |
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229 |
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230 def removedirs(self, path=None): |
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231 """Remove a leaf directory and all empty intermediate ones""" |
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232 return util.removedirs(self.join(path)) |
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233 |
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234 def rmdir(self, path=None): |
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235 """Remove an empty directory.""" |
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236 return os.rmdir(self.join(path)) |
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237 |
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238 def rmtree(self, path=None, ignore_errors=False, forcibly=False): |
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239 """Remove a directory tree recursively |
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240 |
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241 If ``forcibly``, this tries to remove READ-ONLY files, too. |
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242 """ |
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243 if forcibly: |
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244 |
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245 def onerror(function, path, excinfo): |
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246 if function is not os.remove: |
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247 raise |
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248 # read-only files cannot be unlinked under Windows |
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249 s = os.stat(path) |
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250 if (s.st_mode & stat.S_IWRITE) != 0: |
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251 raise |
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252 os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE) |
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253 os.remove(path) |
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254 |
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255 else: |
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256 onerror = None |
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257 return shutil.rmtree( |
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258 self.join(path), ignore_errors=ignore_errors, onerror=onerror |
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259 ) |
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260 |
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261 def setflags(self, path, l, x): |
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262 return util.setflags(self.join(path), l, x) |
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263 |
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264 def stat(self, path=None): |
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265 return os.stat(self.join(path)) |
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266 |
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267 def unlink(self, path=None): |
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268 return util.unlink(self.join(path)) |
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269 |
31542 | 270 def tryunlink(self, path=None): |
271 """Attempt to remove a file, ignoring missing file errors.""" | |
272 util.tryunlink(self.join(path)) | |
273 | |
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274 def unlinkpath(self, path=None, ignoremissing=False, rmdir=True): |
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275 return util.unlinkpath( |
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276 self.join(path), ignoremissing=ignoremissing, rmdir=rmdir |
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277 ) |
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278 |
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279 def utime(self, path=None, t=None): |
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280 return os.utime(self.join(path), t) |
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281 |
24725 | 282 def walk(self, path=None, onerror=None): |
283 """Yield (dirpath, dirs, files) tuple for each directories under path | |
284 | |
285 ``dirpath`` is relative one from the root of this vfs. This | |
286 uses ``os.sep`` as path separator, even you specify POSIX | |
287 style ``path``. | |
288 | |
289 "The root of this vfs" is represented as empty ``dirpath``. | |
290 """ | |
291 root = os.path.normpath(self.join(None)) | |
292 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
293 # because len(dirpath) < prefixlen. | |
294 prefixlen = len(pathutil.normasprefix(root)) | |
295 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
296 yield (dirpath[prefixlen:], dirs, files) | |
297 | |
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298 @contextlib.contextmanager |
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299 def backgroundclosing(self, ui, expectedcount=-1): |
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300 """Allow files to be closed asynchronously. |
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301 |
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302 When this context manager is active, ``backgroundclose`` can be passed |
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303 to ``__call__``/``open`` to result in the file possibly being closed |
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304 asynchronously, on a background thread. |
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305 """ |
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306 # Sharing backgroundfilecloser between threads is complex and using |
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307 # multiple instances puts us at risk of running out of file descriptors |
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308 # only allow to use backgroundfilecloser when in main thread. |
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309 if not isinstance( |
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310 threading.currentThread(), |
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311 threading._MainThread, # pytype: disable=module-attr |
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312 ): |
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313 yield |
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314 return |
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315 vfs = getattr(self, 'vfs', self) |
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316 if getattr(vfs, '_backgroundfilecloser', None): |
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317 raise error.Abort( |
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318 _(b'can only have 1 active background file closer') |
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319 ) |
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320 |
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321 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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322 try: |
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323 vfs._backgroundfilecloser = ( |
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324 bfc # pytype: disable=attribute-error |
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325 ) |
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326 yield bfc |
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327 finally: |
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328 vfs._backgroundfilecloser = ( |
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329 None # pytype: disable=attribute-error |
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330 ) |
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331 |
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332 |
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333 class vfs(abstractvfs): |
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334 """Operate files relative to a base directory |
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335 |
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336 This class is used to hide the details of COW semantics and |
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337 remote file access from higher level code. |
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338 |
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339 'cacheaudited' should be enabled only if (a) vfs object is short-lived, or |
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340 (b) the base directory is managed by hg and considered sort-of append-only. |
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341 See pathutil.pathauditor() for details. |
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342 """ |
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343 |
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344 def __init__( |
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345 self, |
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346 base, |
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347 audit=True, |
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348 cacheaudited=False, |
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349 expandpath=False, |
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350 realpath=False, |
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351 ): |
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352 if expandpath: |
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353 base = util.expandpath(base) |
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354 if realpath: |
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355 base = os.path.realpath(base) |
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356 self.base = base |
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357 self._audit = audit |
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358 if audit: |
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359 self.audit = pathutil.pathauditor(self.base, cached=cacheaudited) |
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360 else: |
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361 self.audit = lambda path, mode=None: True |
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362 self.createmode = None |
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363 self._trustnlink = None |
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364 self.options = {} |
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365 |
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366 @util.propertycache |
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367 def _cansymlink(self): |
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368 return util.checklink(self.base) |
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369 |
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370 @util.propertycache |
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371 def _chmod(self): |
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372 return util.checkexec(self.base) |
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373 |
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374 def _fixfilemode(self, name): |
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375 if self.createmode is None or not self._chmod: |
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376 return |
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377 os.chmod(name, self.createmode & 0o666) |
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378 |
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379 def _auditpath(self, path, mode): |
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380 if self._audit: |
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381 if os.path.isabs(path) and path.startswith(self.base): |
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382 path = os.path.relpath(path, self.base) |
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383 r = util.checkosfilename(path) |
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384 if r: |
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385 raise error.Abort(b"%s: %r" % (r, path)) |
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386 self.audit(path, mode=mode) |
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387 |
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388 def __call__( |
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389 self, |
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390 path, |
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391 mode=b"r", |
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392 atomictemp=False, |
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393 notindexed=False, |
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394 backgroundclose=False, |
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395 checkambig=False, |
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396 auditpath=True, |
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397 makeparentdirs=True, |
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398 ): |
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399 """Open ``path`` file, which is relative to vfs root. |
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400 |
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401 By default, parent directories are created as needed. Newly created |
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402 directories are marked as "not to be indexed by the content indexing |
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403 service", if ``notindexed`` is specified for "write" mode access. |
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404 Set ``makeparentdirs=False`` to not create directories implicitly. |
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405 |
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406 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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407 It can only be used if the ``self.backgroundclosing()`` context manager |
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408 is active. This should only be specified if the following criteria hold: |
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409 |
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410 1. There is a potential for writing thousands of files. Unless you |
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411 are writing thousands of files, the performance benefits of |
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412 asynchronously closing files is not realized. |
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413 2. Files are opened exactly once for the ``backgroundclosing`` |
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414 active duration and are therefore free of race conditions between |
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415 closing a file on a background thread and reopening it. (If the |
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416 file were opened multiple times, there could be unflushed data |
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417 because the original file handle hasn't been flushed/closed yet.) |
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418 |
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419 ``checkambig`` argument is passed to atomictempfile (valid |
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420 only for writing), and is useful only if target file is |
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421 guarded by any lock (e.g. repo.lock or repo.wlock). |
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422 |
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423 To avoid file stat ambiguity forcibly, checkambig=True involves |
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424 copying ``path`` file opened in "append" mode (e.g. for |
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425 truncation), if it is owned by another. Therefore, use |
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426 combination of append mode and checkambig=True only in limited |
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427 cases (see also issue5418 and issue5584 for detail). |
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428 """ |
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429 if auditpath: |
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430 self._auditpath(path, mode) |
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431 f = self.join(path) |
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432 |
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433 if b"b" not in mode: |
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434 mode += b"b" # for that other OS |
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435 |
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436 nlink = -1 |
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437 if mode not in (b'r', b'rb'): |
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438 dirname, basename = util.split(f) |
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439 # If basename is empty, then the path is malformed because it points |
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440 # to a directory. Let the posixfile() call below raise IOError. |
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441 if basename: |
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442 if atomictemp: |
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443 if makeparentdirs: |
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444 util.makedirs(dirname, self.createmode, notindexed) |
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445 return util.atomictempfile( |
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446 f, mode, self.createmode, checkambig=checkambig |
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447 ) |
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448 try: |
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449 if b'w' in mode: |
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450 util.unlink(f) |
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451 nlink = 0 |
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452 else: |
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453 # nlinks() may behave differently for files on Windows |
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454 # shares if the file is open. |
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455 with util.posixfile(f): |
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456 nlink = util.nlinks(f) |
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457 if nlink < 1: |
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458 nlink = 2 # force mktempcopy (issue1922) |
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459 except (OSError, IOError) as e: |
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460 if e.errno != errno.ENOENT: |
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461 raise |
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462 nlink = 0 |
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463 if makeparentdirs: |
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464 util.makedirs(dirname, self.createmode, notindexed) |
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465 if nlink > 0: |
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466 if self._trustnlink is None: |
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467 self._trustnlink = nlink > 1 or util.checknlink(f) |
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468 if nlink > 1 or not self._trustnlink: |
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469 util.rename(util.mktempcopy(f), f) |
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470 fp = util.posixfile(f, mode) |
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471 if nlink == 0: |
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472 self._fixfilemode(f) |
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473 |
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474 if checkambig: |
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475 if mode in (b'r', b'rb'): |
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476 raise error.Abort( |
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477 _( |
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478 b'implementation error: mode %s is not' |
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479 b' valid for checkambig=True' |
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480 ) |
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481 % mode |
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482 ) |
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483 fp = checkambigatclosing(fp) |
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484 |
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485 if backgroundclose and isinstance( |
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486 threading.currentThread(), |
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487 threading._MainThread, # pytype: disable=module-attr |
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488 ): |
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489 if ( |
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490 not self._backgroundfilecloser # pytype: disable=attribute-error |
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491 ): |
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492 raise error.Abort( |
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493 _( |
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494 b'backgroundclose can only be used when a ' |
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495 b'backgroundclosing context manager is active' |
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496 ) |
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497 ) |
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498 |
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499 fp = delayclosedfile( |
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500 fp, |
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501 self._backgroundfilecloser, # pytype: disable=attribute-error |
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502 ) |
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parents:
27879
diff
changeset
|
503 |
13970
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move opener from util to scmutil
Adrian Buehlmann <adrian@cadifra.com>
parents:
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diff
changeset
|
504 return fp |
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parents:
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diff
changeset
|
505 |
d13913355390
move opener from util to scmutil
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parents:
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diff
changeset
|
506 def symlink(self, src, dst): |
18327
4aecdb91443c
scmutil: simplify vfs.audit - drop wrapped vfs.auditor
Mads Kiilerich <mads@kiilerich.com>
parents:
18316
diff
changeset
|
507 self.audit(dst) |
16199
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scmutil: add join method to opener to construct path relative to base
Idan Kamara <idankk86@gmail.com>
parents:
16198
diff
changeset
|
508 linkname = self.join(dst) |
31549 | 509 util.tryunlink(linkname) |
13970
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move opener from util to scmutil
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parents:
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diff
changeset
|
510 |
29017
07be86828e79
util: fix race in makedirs()
Adam Simpkins <simpkins@fb.com>
parents:
28819
diff
changeset
|
511 util.makedirs(os.path.dirname(linkname), self.createmode) |
13970
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move opener from util to scmutil
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parents:
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diff
changeset
|
512 |
14261
e3649bcca3f6
opener: rename _can_symlink to _cansymlink
Adrian Buehlmann <adrian@cadifra.com>
parents:
14236
diff
changeset
|
513 if self._cansymlink: |
13970
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parents:
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diff
changeset
|
514 try: |
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parents:
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diff
changeset
|
515 os.symlink(src, linkname) |
25660
328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
516 except OSError as err: |
43076
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parents:
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diff
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|
517 raise OSError( |
2372284d9457
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parents:
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changeset
|
518 err.errno, |
43077
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parents:
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diff
changeset
|
519 _(b'could not symlink to %r: %s') |
43076
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parents:
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diff
changeset
|
520 % (src, encoding.strtolocal(err.strerror)), |
2372284d9457
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parents:
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diff
changeset
|
521 linkname, |
2372284d9457
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parents:
43025
diff
changeset
|
522 ) |
13970
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Adrian Buehlmann <adrian@cadifra.com>
parents:
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diff
changeset
|
523 else: |
17768
9837cafc25b1
vfs: use self.write to write symlink placeholders
Matt Mackall <mpm@selenic.com>
parents:
17763
diff
changeset
|
524 self.write(dst, src) |
13971
bfeaa88b875d
move canonpath from util to scmutil
Adrian Buehlmann <adrian@cadifra.com>
parents:
13970
diff
changeset
|
525 |
24628
a0b47885a1c5
vfs: make it possible to pass multiple path elements to join
Matt Harbison <matt_harbison@yahoo.com>
parents:
24582
diff
changeset
|
526 def join(self, path, *insidef): |
17161
be016e96117a
localrepo: use file API via vfs while ensuring repository directory
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17157
diff
changeset
|
527 if path: |
24628
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vfs: make it possible to pass multiple path elements to join
Matt Harbison <matt_harbison@yahoo.com>
parents:
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diff
changeset
|
528 return os.path.join(self.base, path, *insidef) |
17681
a41fd730f230
scmutil: backout 83785bb56062 (issue3643)
Matt Mackall <mpm@selenic.com>
parents:
17675
diff
changeset
|
529 else: |
a41fd730f230
scmutil: backout 83785bb56062 (issue3643)
Matt Mackall <mpm@selenic.com>
parents:
17675
diff
changeset
|
530 return self.base |
16199
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scmutil: add join method to opener to construct path relative to base
Idan Kamara <idankk86@gmail.com>
parents:
16198
diff
changeset
|
531 |
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parents:
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changeset
|
532 |
17649
f65c6a5f256c
scmutil: rename classes from "opener" to "vfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17561
diff
changeset
|
533 opener = vfs |
f65c6a5f256c
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parents:
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|
534 |
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parents:
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diff
changeset
|
535 |
41093
6498f0e03526
vfs: fix proxyvfs inheritance
Boris Feld <boris.feld@octobus.net>
parents:
41092
diff
changeset
|
536 class proxyvfs(abstractvfs): |
17845
408ded42c5ec
scmutil: abstract out mustaudit delegation
Bryan O'Sullivan <bryano@fb.com>
parents:
17821
diff
changeset
|
537 def __init__(self, vfs): |
408ded42c5ec
scmutil: abstract out mustaudit delegation
Bryan O'Sullivan <bryano@fb.com>
parents:
17821
diff
changeset
|
538 self.vfs = vfs |
408ded42c5ec
scmutil: abstract out mustaudit delegation
Bryan O'Sullivan <bryano@fb.com>
parents:
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diff
changeset
|
539 |
41094
adee334d94cd
vfs: handle _auditpath in proxyvfs
Boris Feld <boris.feld@octobus.net>
parents:
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diff
changeset
|
540 def _auditpath(self, path, mode): |
adee334d94cd
vfs: handle _auditpath in proxyvfs
Boris Feld <boris.feld@octobus.net>
parents:
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diff
changeset
|
541 return self.vfs._auditpath(path, mode) |
adee334d94cd
vfs: handle _auditpath in proxyvfs
Boris Feld <boris.feld@octobus.net>
parents:
41093
diff
changeset
|
542 |
27879
52a4ad62b006
cleanup: use modern @property/@foo.setter property specification
Augie Fackler <augie@google.com>
parents:
27851
diff
changeset
|
543 @property |
29714
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
544 def options(self): |
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
29417
diff
changeset
|
545 return self.vfs.options |
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
29417
diff
changeset
|
546 |
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
29417
diff
changeset
|
547 @options.setter |
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
548 def options(self, value): |
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
29417
diff
changeset
|
549 self.vfs.options = value |
69109052d9ac
auditvfs: forward options property from nested vfs
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
550 |
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diff
changeset
|
551 |
41093
6498f0e03526
vfs: fix proxyvfs inheritance
Boris Feld <boris.feld@octobus.net>
parents:
41092
diff
changeset
|
552 class filtervfs(proxyvfs, abstractvfs): |
17649
f65c6a5f256c
scmutil: rename classes from "opener" to "vfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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diff
changeset
|
553 '''Wrapper vfs for filtering filenames with a function.''' |
14090
e24b5e3c2f27
add filteropener abstraction for store openers
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents:
14089
diff
changeset
|
554 |
17846
f42cf30873dc
scmutil: add mustaudit delegation to filtervfs (issue3673)
Bryan O'Sullivan <bryano@fb.com>
parents:
17845
diff
changeset
|
555 def __init__(self, vfs, filter): |
33412
a42369e04aee
vfs: rename auditvfs to proxyvfs
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
changeset
|
556 proxyvfs.__init__(self, vfs) |
14090
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add filteropener abstraction for store openers
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents:
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diff
changeset
|
557 self._filter = filter |
e24b5e3c2f27
add filteropener abstraction for store openers
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents:
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diff
changeset
|
558 |
e24b5e3c2f27
add filteropener abstraction for store openers
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents:
14089
diff
changeset
|
559 def __call__(self, path, *args, **kwargs): |
17846
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scmutil: add mustaudit delegation to filtervfs (issue3673)
Bryan O'Sullivan <bryano@fb.com>
parents:
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diff
changeset
|
560 return self.vfs(self._filter(path), *args, **kwargs) |
14090
e24b5e3c2f27
add filteropener abstraction for store openers
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents:
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diff
changeset
|
561 |
24628
a0b47885a1c5
vfs: make it possible to pass multiple path elements to join
Matt Harbison <matt_harbison@yahoo.com>
parents:
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diff
changeset
|
562 def join(self, path, *insidef): |
17725
ffd589d4b785
vfs: define "join()" in each classes derived from "abstractvfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17723
diff
changeset
|
563 if path: |
24628
a0b47885a1c5
vfs: make it possible to pass multiple path elements to join
Matt Harbison <matt_harbison@yahoo.com>
parents:
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diff
changeset
|
564 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
17725
ffd589d4b785
vfs: define "join()" in each classes derived from "abstractvfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17723
diff
changeset
|
565 else: |
17846
f42cf30873dc
scmutil: add mustaudit delegation to filtervfs (issue3673)
Bryan O'Sullivan <bryano@fb.com>
parents:
17845
diff
changeset
|
566 return self.vfs.join(path) |
17725
ffd589d4b785
vfs: define "join()" in each classes derived from "abstractvfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17723
diff
changeset
|
567 |
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parents:
43025
diff
changeset
|
568 |
17649
f65c6a5f256c
scmutil: rename classes from "opener" to "vfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17561
diff
changeset
|
569 filteropener = filtervfs |
f65c6a5f256c
scmutil: rename classes from "opener" to "vfs"
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17561
diff
changeset
|
570 |
43076
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Augie Fackler <augie@google.com>
parents:
43025
diff
changeset
|
571 |
41093
6498f0e03526
vfs: fix proxyvfs inheritance
Boris Feld <boris.feld@octobus.net>
parents:
41092
diff
changeset
|
572 class readonlyvfs(proxyvfs): |
18213
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
573 '''Wrapper vfs preventing any writing.''' |
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
574 |
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
575 def __init__(self, vfs): |
33412
a42369e04aee
vfs: rename auditvfs to proxyvfs
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
changeset
|
576 proxyvfs.__init__(self, vfs) |
18213
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
577 |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
578 def __call__(self, path, mode=b'r', *args, **kw): |
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
579 if mode not in (b'r', b'rb'): |
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
580 raise error.Abort(_(b'this vfs is read only')) |
18213
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
581 return self.vfs(path, mode, *args, **kw) |
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
582 |
26156
a112fffdb632
scmutil.readonlyvfs: implement join
Siddharth Agarwal <sid0@fb.com>
parents:
26098
diff
changeset
|
583 def join(self, path, *insidef): |
a112fffdb632
scmutil.readonlyvfs: implement join
Siddharth Agarwal <sid0@fb.com>
parents:
26098
diff
changeset
|
584 return self.vfs.join(path, *insidef) |
18213
c38a62af000e
vfs: add a read only vfs
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18206
diff
changeset
|
585 |
43076
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parents:
43025
diff
changeset
|
586 |
29994
0c40e64d6154
scmutil: factor out common logic of delayclosedfile to reuse it
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
29802
diff
changeset
|
587 class closewrapbase(object): |
0c40e64d6154
scmutil: factor out common logic of delayclosedfile to reuse it
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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diff
changeset
|
588 """Base class of wrapper, which hooks closing |
27895
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scmutil: support background file closing
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parents:
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diff
changeset
|
589 |
2d6a89e79b48
scmutil: support background file closing
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parents:
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diff
changeset
|
590 Do not instantiate outside of the vfs layer. |
2d6a89e79b48
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parents:
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diff
changeset
|
591 """ |
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parents:
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diff
changeset
|
592 |
29994
0c40e64d6154
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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diff
changeset
|
593 def __init__(self, fh): |
43506
9f70512ae2cf
cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents:
43484
diff
changeset
|
594 object.__setattr__(self, '_origfh', fh) |
27895
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27879
diff
changeset
|
595 |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27879
diff
changeset
|
596 def __getattr__(self, attr): |
2d6a89e79b48
scmutil: support background file closing
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parents:
27879
diff
changeset
|
597 return getattr(self._origfh, attr) |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27879
diff
changeset
|
598 |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27879
diff
changeset
|
599 def __setattr__(self, attr, value): |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
600 return setattr(self._origfh, attr, value) |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27879
diff
changeset
|
601 |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
27879
diff
changeset
|
602 def __delattr__(self, attr): |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
603 return delattr(self._origfh, attr) |
2d6a89e79b48
scmutil: support background file closing
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parents:
27879
diff
changeset
|
604 |
2d6a89e79b48
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parents:
27879
diff
changeset
|
605 def __enter__(self): |
40939
8d9f366b7f19
vfs: ensure closewrapbase fh doesn't escape by entering context manager
Matt Harbison <matt_harbison@yahoo.com>
parents:
39904
diff
changeset
|
606 self._origfh.__enter__() |
8d9f366b7f19
vfs: ensure closewrapbase fh doesn't escape by entering context manager
Matt Harbison <matt_harbison@yahoo.com>
parents:
39904
diff
changeset
|
607 return self |
27895
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scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
608 |
2d6a89e79b48
scmutil: support background file closing
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
609 def __exit__(self, exc_type, exc_value, exc_tb): |
43466
2dcd4e773193
vfs: fix erroneous bytes constants
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
610 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
29994
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parents:
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diff
changeset
|
611 |
0c40e64d6154
scmutil: factor out common logic of delayclosedfile to reuse it
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
29802
diff
changeset
|
612 def close(self): |
43466
2dcd4e773193
vfs: fix erroneous bytes constants
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
613 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
29994
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parents:
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diff
changeset
|
614 |
43076
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parents:
43025
diff
changeset
|
615 |
29994
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
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diff
changeset
|
616 class delayclosedfile(closewrapbase): |
0c40e64d6154
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parents:
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diff
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617 """Proxy for a file object whose close is delayed. |
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618 |
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619 Do not instantiate outside of the vfs layer. |
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620 """ |
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621 |
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622 def __init__(self, fh, closer): |
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623 super(delayclosedfile, self).__init__(fh) |
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624 object.__setattr__(self, '_closer', closer) |
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625 |
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626 def __exit__(self, exc_type, exc_value, exc_tb): |
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627 self._closer.close(self._origfh) |
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628 |
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629 def close(self): |
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630 self._closer.close(self._origfh) |
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631 |
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632 |
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633 class backgroundfilecloser(object): |
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634 """Coordinates background closing of file handles on multiple threads.""" |
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635 |
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636 def __init__(self, ui, expectedcount=-1): |
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637 self._running = False |
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638 self._entered = False |
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639 self._threads = [] |
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640 self._threadexception = None |
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641 |
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642 # Only Windows/NTFS has slow file closing. So only enable by default |
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643 # on that platform. But allow to be enabled elsewhere for testing. |
34645 | 644 defaultenabled = pycompat.iswindows |
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645 enabled = ui.configbool(b'worker', b'backgroundclose', defaultenabled) |
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646 |
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647 if not enabled: |
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648 return |
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649 |
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650 # There is overhead to starting and stopping the background threads. |
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651 # Don't do background processing unless the file count is large enough |
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652 # to justify it. |
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653 minfilecount = ui.configint(b'worker', b'backgroundcloseminfilecount') |
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654 # FUTURE dynamically start background threads after minfilecount closes. |
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655 # (We don't currently have any callers that don't know their file count) |
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656 if expectedcount > 0 and expectedcount < minfilecount: |
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657 return |
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658 |
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659 maxqueue = ui.configint(b'worker', b'backgroundclosemaxqueue') |
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660 threadcount = ui.configint(b'worker', b'backgroundclosethreadcount') |
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661 |
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662 ui.debug( |
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663 b'starting %d threads for background file closing\n' % threadcount |
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664 ) |
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665 |
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666 self._queue = pycompat.queue.Queue(maxsize=maxqueue) |
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667 self._running = True |
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668 |
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669 for i in range(threadcount): |
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670 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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671 self._threads.append(t) |
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672 t.start() |
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673 |
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674 def __enter__(self): |
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675 self._entered = True |
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676 return self |
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677 |
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678 def __exit__(self, exc_type, exc_value, exc_tb): |
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679 self._running = False |
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680 |
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681 # Wait for threads to finish closing so open files don't linger for |
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682 # longer than lifetime of context manager. |
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683 for t in self._threads: |
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684 t.join() |
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685 |
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686 def _worker(self): |
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687 """Main routine for worker thread.""" |
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688 while True: |
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689 try: |
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690 fh = self._queue.get(block=True, timeout=0.100) |
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691 # Need to catch or the thread will terminate and |
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692 # we could orphan file descriptors. |
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693 try: |
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694 fh.close() |
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695 except Exception as e: |
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696 # Stash so can re-raise from main thread later. |
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697 self._threadexception = e |
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698 except pycompat.queue.Empty: |
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699 if not self._running: |
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700 break |
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701 |
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702 def close(self, fh): |
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703 """Schedule a file for closing.""" |
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704 if not self._entered: |
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705 raise error.Abort( |
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706 _(b'can only call close() when context manager active') |
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707 ) |
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708 |
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709 # If a background thread encountered an exception, raise now so we fail |
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710 # fast. Otherwise we may potentially go on for minutes until the error |
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711 # is acted on. |
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712 if self._threadexception: |
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713 e = self._threadexception |
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714 self._threadexception = None |
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715 raise e |
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716 |
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717 # If we're not actively running, close synchronously. |
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718 if not self._running: |
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719 fh.close() |
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720 return |
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721 |
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722 self._queue.put(fh, block=True, timeout=None) |
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723 |
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724 |
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725 class checkambigatclosing(closewrapbase): |
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726 """Proxy for a file object, to avoid ambiguity of file stat |
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727 |
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728 See also util.filestat for detail about "ambiguity of file stat". |
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729 |
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730 This proxy is useful only if the target file is guarded by any |
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731 lock (e.g. repo.lock or repo.wlock) |
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732 |
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733 Do not instantiate outside of the vfs layer. |
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734 """ |
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735 |
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736 def __init__(self, fh): |
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737 super(checkambigatclosing, self).__init__(fh) |
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738 object.__setattr__(self, '_oldstat', util.filestat.frompath(fh.name)) |
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739 |
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740 def _checkambig(self): |
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741 oldstat = self._oldstat |
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742 if oldstat.stat: |
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743 _avoidambig(self._origfh.name, oldstat) |
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744 |
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745 def __exit__(self, exc_type, exc_value, exc_tb): |
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746 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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747 self._checkambig() |
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748 |
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749 def close(self): |
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750 self._origfh.close() |
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751 self._checkambig() |