view mercurial/templates/spartan/filelogentry.tmpl @ 45095:8e04607023e5

procutil: ensure that procutil.std{out,err}.write() writes all bytes

Python 3 offers different kind of streams and it’s not guaranteed for all of
them that calling write() writes all bytes.

When Python is started in unbuffered mode, sys.std{out,err}.buffer are
instances of io.FileIO, whose write() can write less bytes for
platform-specific reasons (e.g. Linux has a 0x7ffff000 bytes maximum and could
write less if interrupted by a signal; when writing to Windows consoles, it’s
limited to 32767 bytes to avoid the "not enough space" error). This can lead to
silent loss of data, both when using sys.std{out,err}.buffer (which may in fact
not be a buffered stream) and when using the text streams sys.std{out,err}
(I’ve created a CPython bug report for that:
https://bugs.python.org/issue41221).

Python may fix the problem at some point. For now, we implement our own wrapper
for procutil.std{out,err} that calls the raw stream’s write() method until all
bytes have been written. We don’t use sys.std{out,err} for larger writes, so I
think it’s not worth the effort to patch them.

<table class="logEntry parity{parity}">
 <tr>
  <th class="label"><span class="age">{date|rfc822date}</span>:</th>
  <th class="firstline"><a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a></th>
 </tr>
 <tr>
  <th class="revision">revision {filerev}:</th>
  <td class="node">
   <a href="{url|urlescape}file/{node|short}/{file|urlescape}{sessionvars%urlparameter}">{node|short}</a>
   <a href="{url|urlescape}diff/{node|short}/{file|urlescape}{sessionvars%urlparameter}">(diff)</a>
   <a href="{url|urlescape}annotate/{node|short}/{file|urlescape}{sessionvars%urlparameter}">(annotate)</a>
  </td>
 </tr>
 {rename%filelogrename}
 <tr>
  <th class="author">author:</th>
  <td class="author">{author|obfuscate}</td>
 </tr>
 <tr>
  <th class="date">date:</th>
  <td class="date">{date|rfc822date}</td>
 </tr>
</table>