# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1492440799 -32400
# Node ID cde72a195f3207f9b55099be28276d631e34ab22
# Parent  b844d0d367e298688e491d2f18accc53e30b63e9
dispatch: ignore further SIGPIPE while handling KeyboardInterrupt

I got the following error by running "hg log" and quitting the pager
immediately. Any output here may trigger another SIGPIPE, so only thing
we can do is to swallow the exception and exit with an error status.

  Traceback (most recent call last):
    File "./hg", line 45, in <module>
      mercurial.dispatch.run()
    File "mercurial/dispatch.py", line 83, in run
      status = (dispatch(req) or 0) & 255
    File "mercurial/dispatch.py", line 167, in dispatch
      req.ui.warn(_("interrupted!\n"))
    File "mercurial/ui.py", line 1224, in warn
      self.write_err(*msg, **opts)
    File "mercurial/ui.py", line 790, in write_err
      self._write_err(*msgs, **opts)
    File "mercurial/ui.py", line 798, in _write_err
      self.ferr.write(a)
    File "mercurial/ui.py", line 129, in _catchterm
      raise error.SignalInterrupt
  mercurial.error.SignalInterrupt

Perhaps this wasn't visible before de5c9d0e02ea because the original stderr
handle was restored very late.

diff -r b844d0d367e2 -r cde72a195f32 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Sat Apr 15 13:04:55 2017 +0900
+++ b/mercurial/dispatch.py	Mon Apr 17 23:53:19 2017 +0900
@@ -165,6 +165,10 @@
     except KeyboardInterrupt:
         try:
             req.ui.warn(_("interrupted!\n"))
+        except error.SignalInterrupt:
+            # maybe pager would quit without consuming all the output, and
+            # SIGPIPE was raised. we cannot print anything in this case.
+            pass
         except IOError as inst:
             if inst.errno != errno.EPIPE:
                 raise