--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/galaxy/util/sockets.py	Thu May 14 14:56:58 2020 -0400
@@ -0,0 +1,43 @@
+import random
+import shlex
+import socket
+import subprocess
+
+
+def unused_port(range=None):
+    if range:
+        return __unused_port_on_range(range)
+    else:
+        return __unused_port_rangeless()
+
+
+def __unused_port_rangeless():
+    # TODO: Allow ranges (though then need to guess and check)...
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.bind(('localhost', 0))
+    addr, port = s.getsockname()
+    s.close()
+    return port
+
+
+def __unused_port_on_range(range):
+    assert range[0] and range[1]
+
+    # Find all ports that are already occupied
+    cmd_netstat = shlex.split("netstat tuln")
+    p1 = subprocess.Popen(cmd_netstat, stdout=subprocess.PIPE)
+
+    occupied_ports = set()
+    for line in p1.stdout.read().split('\n'):
+        if line.startswith('tcp') or line.startswith('tcp6'):
+            col = line.split()
+            local_address = col[3]
+            local_port = local_address.split(':')[1]
+            occupied_ports.add(int(local_port))
+
+    # Generate random free port number.
+    while True:
+        port = random.randrange(range[0], range[1])
+        if port not in occupied_ports:
+            break
+    return port