Mercurial > hg
annotate tests/test-diff-hashes.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 | 4c94b6d0fb1c |
children | 117f9190c1ba |
rev | line source |
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1 $ hg init a |
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2 $ cd a |
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3 |
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4 $ hg diff inexistent1 inexistent2 |
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5 inexistent1: No such file or directory |
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6 inexistent2: No such file or directory |
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7 |
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8 $ echo bar > foo |
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9 $ hg add foo |
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10 $ hg ci -m 'add foo' |
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11 |
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12 $ echo foobar > foo |
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13 $ hg ci -m 'change foo' |
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14 |
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15 $ hg --quiet diff -r 0 -r 1 |
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16 --- a/foo Thu Jan 01 00:00:00 1970 +0000 |
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17 +++ b/foo Thu Jan 01 00:00:00 1970 +0000 |
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18 @@ -1,1 +1,1 @@ |
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19 -bar |
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20 +foobar |
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21 |
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22 $ hg diff -r 0 -r 1 |
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23 diff -r a99fb63adac3 -r 9b8568d3af2f foo |
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24 --- a/foo Thu Jan 01 00:00:00 1970 +0000 |
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25 +++ b/foo Thu Jan 01 00:00:00 1970 +0000 |
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26 @@ -1,1 +1,1 @@ |
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27 -bar |
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28 +foobar |
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29 |
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30 $ hg --verbose diff -r 0 -r 1 |
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31 diff -r a99fb63adac3 -r 9b8568d3af2f foo |
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32 --- a/foo Thu Jan 01 00:00:00 1970 +0000 |
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33 +++ b/foo Thu Jan 01 00:00:00 1970 +0000 |
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34 @@ -1,1 +1,1 @@ |
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35 -bar |
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36 +foobar |
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37 |
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38 $ hg --debug diff -r 0 -r 1 |
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39 diff -r a99fb63adac3f31816a22f665bc3b7a7655b30f4 -r 9b8568d3af2f1749445eef03aede868a6f39f210 foo |
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40 --- a/foo Thu Jan 01 00:00:00 1970 +0000 |
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41 +++ b/foo Thu Jan 01 00:00:00 1970 +0000 |
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42 @@ -1,1 +1,1 @@ |
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43 -bar |
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44 +foobar |
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45 |