# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 1515989216 28800
# Node ID 48fe4f56a3b4138813ba912b012498ce349c4c24
# Parent  40da2d7b487175735bc304211da09f6f7497fd2d
dispatch: handle IOError when writing to stderr

Previously, attempts to write to stderr in dispatch.run() may lead to
an exception being thrown. This would likely be handled by Python's
default exception handler, which would print the exception and exit
1.

Code in this function is already catching IOError for stdout failures
and converting to exit code 255 (-1 & 255 == 255). Why we weren't
doing the same for stderr for the sake of consistency, I don't know.
I do know that chg and hg diverged in behavior here (as the changed
test-basic.t shows).

After this commit, we catch I/O failure on stderr and change the
exit code to 255. chg and hg now behave consistently. As a bonus,
Rust hg also now passes this test.

I'm skeptical at changing the exit code due to failures this late
in the process. I think we should consider preserving the current
exit code - assuming it is non-0. And, we may want to preserve the
exit code completely if the I/O error is EPIPE (and potentially
other special error classes). There's definitely room to tweak
behavior. But for now, let's at least prevent the uncaught exception.

Differential Revision: https://phab.mercurial-scm.org/D1860

diff -r 40da2d7b4871 -r 48fe4f56a3b4 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Sun Jan 14 19:30:48 2018 -0800
+++ b/mercurial/dispatch.py	Sun Jan 14 20:06:56 2018 -0800
@@ -96,10 +96,16 @@
             err = e
             status = -1
     if util.safehasattr(req.ui, 'ferr'):
-        if err is not None and err.errno != errno.EPIPE:
-            req.ui.ferr.write('abort: %s\n' %
-                              encoding.strtolocal(err.strerror))
-        req.ui.ferr.flush()
+        try:
+            if err is not None and err.errno != errno.EPIPE:
+                req.ui.ferr.write('abort: %s\n' %
+                                  encoding.strtolocal(err.strerror))
+            req.ui.ferr.flush()
+        # There's not much we can do about an I/O error here. So (possibly)
+        # change the status code and move on.
+        except IOError:
+            status = -1
+
     sys.exit(status & 255)
 
 def _initstdio():
diff -r 40da2d7b4871 -r 48fe4f56a3b4 tests/test-basic.t
--- a/tests/test-basic.t	Sun Jan 14 19:30:48 2018 -0800
+++ b/tests/test-basic.t	Sun Jan 14 20:06:56 2018 -0800
@@ -34,15 +34,7 @@
   [255]
 #endif
 
-#if devfull no-chg
-  $ hg status >/dev/full 2>&1
-  [1]
-
-  $ hg status ENOENT 2>/dev/full
-  [1]
-#endif
-
-#if devfull chg
+#if devfull
   $ hg status >/dev/full 2>&1
   [255]