D687: ssh: fix flakey ssh errors on BSD systems

[durham (Durham Goode)]

durham created this revision.
Herald added a subscriber: mercurial-devel.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  There's been a persistent issue with flakiness on BSD systems (like OSX) where
  the 'no suitable response from remote hg' message would sometimes not appear.
  This was caused by one of the earlier calls failing with a "IOError: Broken
  pipe". Catching those errors and printing the same message removes the
  flakiness.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D687

AFFECTED FILES
  mercurial/sshpeer.py

CHANGE DETAILS

diff --git a/mercurial/sshpeer.py b/mercurial/sshpeer.py
--- a/mercurial/sshpeer.py
+++ b/mercurial/sshpeer.py
@@ -203,23 +203,33 @@
         self._pipei = doublepipe(self.ui, self._pipei, self._pipee)
         self._pipeo = doublepipe(self.ui, self._pipeo, self._pipee)
 
-        # skip any noise generated by remote shell
-        self._callstream("hello")
-        r = self._callstream("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
+        def badresponse():
+            self._abort(error.RepoError(_('no suitable response from '
+                                          'remote hg')))
+
+        try:
+            # skip any noise generated by remote shell
+            self._callstream("hello")
+            r = self._callstream("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
+        except IOError:
+            badresponse()
+
         lines = ["", "dummy"]
         max_noise = 500
         while lines[-1] and max_noise:
-            l = r.readline()
-            self._readerr()
-            if lines[-1] == "1\n" and l == "\n":
-                break
-            if l:
-                self.ui.debug("remote: ", l)
-            lines.append(l)
-            max_noise -= 1
+            try:
+                l = r.readline()
+                self._readerr()
+                if lines[-1] == "1\n" and l == "\n":
+                    break
+                if l:
+                    self.ui.debug("remote: ", l)
+                lines.append(l)
+                max_noise -= 1
+            except IOError:
+                badresponse()
         else:
-            self._abort(error.RepoError(_('no suitable response from '
-                                          'remote hg')))
+            badresponse()
 
         self._caps = set()
         for l in reversed(lines):



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