Mercurial > public > mercurial-scm > hg-stable
diff mercurial/ui.py @ 33668:cde4cfeb6e3e stable
ui: restore behavior to ignore some I/O errors (issue5658)
e9646ff34d55 and 1bfb9a63b98e refactored ui methods to no longer
silently swallow some IOError instances. This is arguably the
correct thing to do. However, it had the unfortunate side-effect
of causing StdioError to bubble up to sensitive code like
transaction aborts, leading to an uncaught exceptions and failures
to e.g. roll back a transaction. This could occur when a remote
HTTP or SSH client connection dropped. The new behavior is
resulting in semi-frequent "abandonded transaction" errors on
multiple high-volume repositories at Mozilla.
This commit effectively reverts e9646ff34d55 and 1bfb9a63b98e to
restore the old behavior.
I agree with the principle that I/O errors shouldn't be ignored.
That makes this change... unfortunate. However, our hands are tied
for what to do on stable. I think the proper solution is for the
ui's behavior to be configurable (possibly via a context manager).
During critical sections like transaction rollback and abort, it
should be possible to suppress errors. But this feature would not
be appropriate on stable.
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Tue, 15 Aug 2017 13:04:31 -0700 |
| parents | c2c6a0f7408b |
| children | 0e4bed5c5c38 af20468eb0a4 |
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--- a/mercurial/ui.py Mon Aug 14 13:12:40 2017 -0700 +++ b/mercurial/ui.py Tue Aug 15 13:04:31 2017 -0700 @@ -904,7 +904,8 @@ if not getattr(self.ferr, 'closed', False): self.ferr.flush() except IOError as inst: - raise error.StdioError(inst) + if inst.errno not in (errno.EPIPE, errno.EIO, errno.EBADF): + raise error.StdioError(inst) def flush(self): # opencode timeblockedsection because this is a critical path @@ -913,12 +914,14 @@ try: self.fout.flush() except IOError as err: - raise error.StdioError(err) + if err.errno not in (errno.EPIPE, errno.EIO, errno.EBADF): + raise error.StdioError(err) finally: try: self.ferr.flush() except IOError as err: - raise error.StdioError(err) + if err.errno not in (errno.EPIPE, errno.EIO, errno.EBADF): + raise error.StdioError(err) finally: self._blockedtimes['stdio_blocked'] += \ (util.timer() - starttime) * 1000