Mercurial > hg
annotate tests/test-issue842.t @ 14007:d764463b433e
atomictempfile: avoid infinite recursion in __del__().
The problem is that a programmer using atomictempfile directly can
make an innocent everyday mistake -- not enough args to the
constructor -- which escalates badly. You would expect a simple
TypeError crash in that case, but you actually get an infinite
recursion that is surprisingly difficult to kill: it happens between
__del__() and __getattr__(), and Python does not handle infinite
recursion from __del__() well.
The fix is to not implement __getattr__(), but instead assign instance
attributes for the methods we wish to delegate to the builtin file
type: write() and fileno(). I've audited mercurial.* and hgext.* and
found no users of atomictempfile using methods other than write() and
rename(). I audited third-party extensions and found one (snap)
passing an atomictempfile to util.fstat(), so I also threw in
fileno().
The last time I submitted a similar patch, Matt proposed that we make
atomictempfile a subclass of file instead of wrapping it. Rejected on
grounds of unnecessary complexity: for one thing, it would make the
Windows implementation of posixfile quite a bit more complex. It would
have to become a subclass of file rather than a simple function -- but
since it's written in C, this is non-obvious and non-trivial.
Furthermore, there's nothing wrong with wrapping objects and
delegating methods: it's a well-established pattern that works just
fine in many cases. Subclassing is not the answer to all of life's
problems.
author | Greg Ward <greg@gerg.ca> |
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date | Sun, 24 Apr 2011 19:25:10 -0400 |
parents | b63f6422d2a7 |
children | 41885892796e |
rev | line source |
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1 http://mercurial.selenic.com/bts/issue842 |
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2 |
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3 $ hg init |
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4 $ echo foo > a |
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5 $ hg ci -Ama |
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6 adding a |
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7 |
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8 $ hg up -r0000 |
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9 0 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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10 |
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11 $ echo bar > a |
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12 |
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13 Should issue new head warning: |
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14 |
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15 $ hg ci -Amb |
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16 adding a |
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17 created new head |
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18 |
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19 $ hg up -r0000 |
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20 0 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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21 |
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22 $ echo stuffy > a |
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23 |
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24 Should not issue new head warning: |
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25 |
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26 $ hg ci -q -Amc |
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27 |
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28 $ hg up -r0000 |
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29 0 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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30 |
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31 $ echo crap > a |
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32 $ hg branch testing |
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33 marked working directory as branch testing |
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34 |
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35 Should not issue warning: |
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36 |
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37 $ hg ci -q -Amd |
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38 |