[LNT] Python 3 support: adapt secret computation

Computation of the secret when it is not supplied on the command line
involves passing a string constructed with str to the sha1 function.
However that function expects binary data which is a different type in
Python3. This commit uses the bytes constructor as an additional step to
convert from text to binary data.

Reviewers: cmatthews, hubert.reinterpretcast, kristof.beyls

Reviewed By: hubert.reinterpretcast

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D68104

llvm-svn: 374303

Author: Thomas Preud'homme

lnt/lnttool/create.py

@@ -113,6 +113,7 @@ def action_create(instance_path, name, config, wsgi, tmp_dir, db_dir,
 * INSTANCE_PATH should point to a directory that will keep
 LNT configuration.
     """
+    from builtins import bytes
     from .common import init_logger
     import hashlib
     import lnt.server.db.migrate
@@ -137,8 +138,12 @@ def action_create(instance_path, name, config, wsgi, tmp_dir, db_dir,
     tmp_path = os.path.join(basepath, tmp_dir)
     wsgi_path = os.path.join(basepath, wsgi)
     schemas_path = os.path.join(basepath, "schemas")
-    secret_key = (secret_key or
-                  hashlib.sha1(str(random.getrandbits(256))).hexdigest())
+    secret_key = (
+        secret_key or
+        hashlib.sha1(
+            bytes(str(random.getrandbits(256)), encoding="ascii")
+        ).hexdigest()
+    )
 
     os.mkdir(instance_path)
     os.mkdir(tmp_path)