Use /dev/urandom to avoid waiting for /dev/random

ChangeLog.txt

@@ -4,6 +4,9 @@ Fixes:
 - logging: Use default platform encoding instead of hardcoded one
   of iso-8859-1.
   Closes: SF bug #2770077
+- dns: use /dev/urandom instead of /dev/random to get initial seed
+  on Linux machines since the last one can block indefinitely.
+  Closes: SF bug #2901667
 
 5.1 "Let the right one in" (released 04.08.2009)
 

linkcheck/dns/entropy.py

@@ -22,7 +22,9 @@ class EntropyPool(object):
         self.next_byte = 0
         if seed is None:
             try:
-                r = file('/dev/random')
+                # Note that /dev/random can block indefinitely, so use
+                # /dev/urandom instead.
+                r = file('/dev/urandom')
                 try:
                     seed = r.read(16)
                 finally: