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Commit c99f05e5 authored by Gregory Szorc's avatar Gregory Szorc
Browse files

hook: move stdio redirection to context manager

The old code was checking stdio redirection in a loop.
This didn't make sense. The pattern is better expressed
as a context manager IMO, so this commit refactors it
to be one.

Differential Revision: https://phab.mercurial-scm.org/D8338
parent 00e0c5c06ed5
......@@ -7,6 +7,7 @@
from __future__ import absolute_import
import contextlib
import os
import sys
......@@ -259,26 +260,45 @@ def hook(ui, repo, htype, throw=False, **args):
return r
@contextlib.contextmanager
def redirect_stdio():
"""Redirects stdout to stderr, if possible."""
oldstdout = -1
try:
if _redirect:
try:
stdoutno = procutil.stdout.fileno()
stderrno = procutil.stderr.fileno()
# temporarily redirect stdout to stderr, if possible
if stdoutno >= 0 and stderrno >= 0:
procutil.stdout.flush()
oldstdout = os.dup(stdoutno)
os.dup2(stderrno, stdoutno)
except (OSError, AttributeError):
# files seem to be bogus, give up on redirecting (WSGI, etc)
pass
yield
finally:
# The stderr is fully buffered on Windows when connected to a pipe.
# A forcible flush is required to make small stderr data in the
# remote side available to the client immediately.
procutil.stderr.flush()
if _redirect and oldstdout >= 0:
procutil.stdout.flush() # write hook output to stderr fd
os.dup2(oldstdout, stdoutno)
os.close(oldstdout)
def runhooks(ui, repo, htype, hooks, throw=False, **args):
args = pycompat.byteskwargs(args)
res = {}
oldstdout = -1
try:
with redirect_stdio():
for hname, cmd in hooks:
if oldstdout == -1 and _redirect:
try:
stdoutno = procutil.stdout.fileno()
stderrno = procutil.stderr.fileno()
# temporarily redirect stdout to stderr, if possible
if stdoutno >= 0 and stderrno >= 0:
procutil.stdout.flush()
oldstdout = os.dup(stdoutno)
os.dup2(stderrno, stdoutno)
except (OSError, AttributeError):
# files seem to be bogus, give up on redirecting (WSGI, etc)
pass
if cmd is _fromuntrusted:
if throw:
raise error.HookAbort(
......@@ -312,15 +332,5 @@ def runhooks(ui, repo, htype, hooks, throw=False, **args):
raised = False
res[hname] = r, raised
finally:
# The stderr is fully buffered on Windows when connected to a pipe.
# A forcible flush is required to make small stderr data in the
# remote side available to the client immediately.
procutil.stderr.flush()
if _redirect and oldstdout >= 0:
procutil.stdout.flush() # write hook output to stderr fd
os.dup2(oldstdout, stdoutno)
os.close(oldstdout)
return res
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