From cc468d499ee83f6b6ed876ef90aaf845eb6c65dd Mon Sep 17 00:00:00 2001
From: Anthony Scopatz <scopatz@gmail.com>
Date: Fri, 23 Mar 2018 13:35:08 -0400
Subject: [PATCH] Fixed process hanging issue.

---
 news/checkend.rst | 14 ++++++++++++++
 xonsh/proc.py     |  8 +++++---
 2 files changed, 19 insertions(+), 3 deletions(-)
 create mode 100644 news/checkend.rst

diff --git a/news/checkend.rst b/news/checkend.rst
new file mode 100644
index 000000000..509194fb3
--- /dev/null
+++ b/news/checkend.rst
@@ -0,0 +1,14 @@
+**Added:** None
+
+**Changed:** None
+
+**Deprecated:** None
+
+**Removed:** None
+
+**Fixed:**
+
+* Fixed hanging issue with pipelines whose middle processes exit before the
+  first or last process.
+
+**Security:** None
diff --git a/xonsh/proc.py b/xonsh/proc.py
index 33933c19a..4a017e31d 100644
--- a/xonsh/proc.py
+++ b/xonsh/proc.py
@@ -2062,16 +2062,18 @@ class CommandPipeline:
         """Boolean for if all previous processes have completed. If there
         is only a single process in the pipeline, this returns False.
         """
+        any_running = False
         for s, p in zip(self.specs[:-1], self.procs[:-1]):
+            if p.poll() is None:
+                any_running = True
+                continue
             self._safe_close(p.stdin)
             self._safe_close(s.stdin)
-            if p.poll() is None:
-                return False
             self._safe_close(p.stdout)
             self._safe_close(s.stdout)
             self._safe_close(p.stderr)
             self._safe_close(s.stderr)
-        return len(self) > 1
+        return False if any_running else (len(self) > 1)
 
     def _close_prev_procs(self):
         """Closes all but the last proc's stdout."""