Mercurial > hg
annotate tests/test-pull-r.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> |
---|---|
date | Sun, 24 Apr 2011 19:25:10 -0400 |
parents | 1e497df514e2 |
children | 90d997a812dc |
rev | line source |
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12279 | 1 $ hg init repo |
2 $ cd repo | |
3 $ echo foo > foo | |
4 $ hg ci -qAm 'add foo' | |
5 $ echo >> foo | |
6 $ hg ci -m 'change foo' | |
7 $ hg up -qC 0 | |
8 $ echo bar > bar | |
9 $ hg ci -qAm 'add bar' | |
5221
8ede77c2d008
pull -r: pass the revisions as the heads argument of findincoming
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
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10 |
12279 | 11 $ hg log |
12 changeset: 2:effea6de0384 | |
13 tag: tip | |
14 parent: 0:bbd179dfa0a7 | |
15 user: test | |
16 date: Thu Jan 01 00:00:00 1970 +0000 | |
17 summary: add bar | |
18 | |
19 changeset: 1:ed1b79f46b9a | |
20 user: test | |
21 date: Thu Jan 01 00:00:00 1970 +0000 | |
22 summary: change foo | |
23 | |
24 changeset: 0:bbd179dfa0a7 | |
25 user: test | |
26 date: Thu Jan 01 00:00:00 1970 +0000 | |
27 summary: add foo | |
28 | |
29 $ cd .. | |
30 $ hg init copy | |
31 $ cd copy | |
32 | |
33 Pull a missing revision: | |
5221
8ede77c2d008
pull -r: pass the revisions as the heads argument of findincoming
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
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34 |
12279 | 35 $ hg pull -qr missing ../repo |
36 abort: unknown revision 'missing'! | |
12316
4134686b83e1
tests: add exit codes to unified tests
Matt Mackall <mpm@selenic.com>
parents:
12279
diff
changeset
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37 [255] |
12279 | 38 |
39 Pull multiple revisions with update: | |
6405
b8346ae5d64b
commands: fix shadowed repo module
Patrick Mezard <pmezard@gmail.com>
parents:
5221
diff
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40 |
12279 | 41 $ hg pull -qu -r 0 -r 1 ../repo |
42 $ hg -q parents | |
43 0:bbd179dfa0a7 | |
44 $ hg rollback | |
13446
1e497df514e2
rollback: clarifies the message about the reverted state (issue2628)
Gilles Moris <gilles.moris@free.fr>
parents:
12316
diff
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45 repository tip rolled back to revision -1 (undo pull) |
1e497df514e2
rollback: clarifies the message about the reverted state (issue2628)
Gilles Moris <gilles.moris@free.fr>
parents:
12316
diff
changeset
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46 working directory now based on revision -1 |
10358
d42821cd5c96
pull: with -u and -r, update to the first revision given
Sune Foldager <cryo@cyanite.org>
parents:
8167
diff
changeset
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47 |
12279 | 48 $ hg pull -qr 0 ../repo |
49 $ hg log | |
50 changeset: 0:bbd179dfa0a7 | |
51 tag: tip | |
52 user: test | |
53 date: Thu Jan 01 00:00:00 1970 +0000 | |
54 summary: add foo | |
55 | |
56 $ hg pull -qr 1 ../repo | |
57 $ hg log | |
58 changeset: 1:ed1b79f46b9a | |
59 tag: tip | |
60 user: test | |
61 date: Thu Jan 01 00:00:00 1970 +0000 | |
62 summary: change foo | |
63 | |
64 changeset: 0:bbd179dfa0a7 | |
65 user: test | |
66 date: Thu Jan 01 00:00:00 1970 +0000 | |
67 summary: add foo | |
68 | |
5221
8ede77c2d008
pull -r: pass the revisions as the heads argument of findincoming
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
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69 |
12279 | 70 This used to abort: received changelog group is empty: |
5221
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pull -r: pass the revisions as the heads argument of findincoming
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
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71 |
12279 | 72 $ hg pull -qr 1 ../repo |
73 |