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windows: insert file positioning call between reads and writes fopen() and fdopen() have a unique-to-Windows requirement that transitions between read and write operations in files opened in modes r+, w+, and a+ perform a file positioning call (fsetpos, fseek, or rewind) in between. While the MSDN docs don't say what will happen if this is not done, observations reveal that Python raises an IOError with errno 0. Furthermore, I /think/ this behavior isn't deterministic. But I can reproduce it reliably with subsequent patches applied that open revlogs in a+ mode and perform both reads and writes. This patch introduces a proxy class for file handles opened in r+, w+, and a+ mode on Windows. The class intercepts calls and audits whether a file positioning function has been called between read and write operations. If not, a dummy, no-op seek to the current file position is performed. This appears to be sufficient to "trick" Windows into allowing transitions between read and writes without raising errors.
author Gregory Szorc <gregory.szorc@gmail.com>
date Sun, 27 Sep 2015 18:46:53 -0700
parents 0f1311e829c9
children 31c37e703cee
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*** Test in-uri schemes

CFG: {x.prefix: http://example.org}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: https://example.org}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: http://example.org, x.schemes: https}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: https://example.org, x.schemes: http}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort

*** Test separately configured schemes

CFG: {x.prefix: example.org, x.schemes: http}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: example.org, x.schemes: https}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: example.org, x.schemes: http https}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort

*** Test prefix matching

CFG: {x.prefix: http://example.org/foo, y.prefix: http://example.org/bar}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('y', 'y')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: http://example.org/foo, y.prefix: http://example.org/foo/bar}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('y', 'y')
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {x.prefix: *, y.prefix: https://example.org/bar}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('y', 'y')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     ('y', 'y')

*** Test user matching

CFG: {x.password: xpassword, x.prefix: http://example.org/foo, x.username: None}
URI: http://y@example.org/foo
     ('y', 'xpassword')
CFG: {x.password: xpassword, x.prefix: http://example.org/foo, x.username: None, y.password: ypassword, y.prefix: http://example.org/foo, y.username: y}
URI: http://y@example.org/foo
     ('y', 'ypassword')
CFG: {x.password: xpassword, x.prefix: http://example.org/foo/bar, x.username: None, y.password: ypassword, y.prefix: http://example.org/foo, y.username: y}
URI: http://y@example.org/foo/bar
     ('y', 'xpassword')

*** Test urllib2 and util.url

URIs: http://user@example.com:8080/foo http://example.com:8080/foo
('user', '')