Mercurial > hg
annotate tests/test-1993.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 | 61c0df2b089a |
children | f2719b387380 |
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1 $ hg init a |
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2 $ cd a |
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3 $ echo a > a |
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4 $ hg ci -Am0 |
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5 adding a |
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6 $ echo b > b |
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7 $ hg ci -Am1 |
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8 adding b |
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9 $ hg tag -r0 default |
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10 warning: tag default conflicts with existing branch name |
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11 $ hg log |
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12 changeset: 2:30a83d1e4a1e |
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13 tag: tip |
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14 user: test |
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15 date: Thu Jan 01 00:00:00 1970 +0000 |
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16 summary: Added tag default for changeset f7b1eb17ad24 |
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17 |
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18 changeset: 1:925d80f479bb |
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19 user: test |
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20 date: Thu Jan 01 00:00:00 1970 +0000 |
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21 summary: 1 |
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22 |
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23 changeset: 0:f7b1eb17ad24 |
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24 tag: default |
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25 user: test |
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26 date: Thu Jan 01 00:00:00 1970 +0000 |
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27 summary: 0 |
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28 |
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29 $ hg update 'tag(default)' |
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30 0 files updated, 0 files merged, 2 files removed, 0 files unresolved |
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31 $ hg parents |
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32 changeset: 0:f7b1eb17ad24 |
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33 tag: default |
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34 user: test |
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35 date: Thu Jan 01 00:00:00 1970 +0000 |
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update: use revsingle to enable use of revsets as update targets (issue1993)
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36 summary: 0 |
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37 |
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38 $ hg update 'branch(default)' |
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39 2 files updated, 0 files merged, 0 files removed, 0 files unresolved |
61c0df2b089a
update: use revsingle to enable use of revsets as update targets (issue1993)
Augie Fackler <durin42@gmail.com>
parents:
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40 $ hg parents |
61c0df2b089a
update: use revsingle to enable use of revsets as update targets (issue1993)
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parents:
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41 changeset: 2:30a83d1e4a1e |
61c0df2b089a
update: use revsingle to enable use of revsets as update targets (issue1993)
Augie Fackler <durin42@gmail.com>
parents:
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42 tag: tip |
61c0df2b089a
update: use revsingle to enable use of revsets as update targets (issue1993)
Augie Fackler <durin42@gmail.com>
parents:
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43 user: test |
61c0df2b089a
update: use revsingle to enable use of revsets as update targets (issue1993)
Augie Fackler <durin42@gmail.com>
parents:
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44 date: Thu Jan 01 00:00:00 1970 +0000 |
61c0df2b089a
update: use revsingle to enable use of revsets as update targets (issue1993)
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parents:
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45 summary: Added tag default for changeset f7b1eb17ad24 |
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46 |