Merge pull request #2187 from benoitc/fix-2160

fix gunicorn when used with musl libc

gunicorn/socketfromfd.py

@@ -12,7 +12,7 @@ import socket
 import sys
 import platform
 
-from ctypes.util import find_library
+from .util import find_library
 
 __all__ = ('fromfd',)
 

gunicorn/util.py

@@ -3,6 +3,7 @@
 # This file is part of gunicorn released under the MIT license.
 # See the NOTICE for more information.
 import ast
+import ctypes.util
 import email.utils
 import errno
 import fcntl
@@ -635,3 +636,34 @@ def bytes_to_str(b):
 
 def unquote_to_wsgi_str(string):
     return urllib.parse.unquote_to_bytes(string).decode('latin-1')
+
+
+def _findWalk_ldpath(name):
+    def _is_elf(filepath):
+        try:
+            with open(filepath, 'rb') as fh:
+                return fh.read(4) == b'\x7fELF'
+        except:
+            return False
+    from glob import glob
+    if os.path.isabs(name):
+        return name
+
+    # search LD_LIBRARY_PATH list
+    paths = ['/lib', '/usr/local/lib', '/usr/lib']
+    if 'LD_LIBRARY_PATH' in os.environ:
+        paths = os.environ['LD_LIBRARY_PATH'].split(':') + paths
+
+    for d in paths:
+        f = os.path.join(d, name)
+        if _is_elf(f):
+            return os.path.basename(f)
+        prefix = os.path.join(d, 'lib'+name)
+        for suffix in ['so', 'so.*']:
+            for f in glob('{0}.{1}'.format(prefix, suffix)):
+                if _is_elf(f):
+                    return os.path.basename(f)
+
+
+def find_library(name):
+    return ctypes.util.find_library(name) or _findWalk_ldpath(name)