[sosreport] move archive checksumming to sosreport

Although the digest algorithm is policy controlled the actual
mechanism to checksum the archive does not belong in the policies
module: historically this was done to keep the code that calculates
the checksum close to the UI code that reports it.

Move the calculation to the main SoSReport class's final_work()
method and add a 'checksum' argument to the display_results()
method so that the value can be reported.

In future it may make sense to push the checksum code directly into
the archive class.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

sos/policies/__init__.py

@@ -13,7 +13,6 @@
                            shell_out)
 from sos.plugins import IndependentPlugin, ExperimentalPlugin
 from sos import _sos as _
-import hashlib
 from textwrap import fill
 from six import print_
 from six.moves import input
@@ -285,22 +284,12 @@ def is_root(self):
         considered to be a superuser"""
         return (os.getuid() == 0)
 
-    def _create_checksum(self, hash_name, archive=None):
-        if not archive:
-            return False
-
-        archive_fp = open(archive, 'rb')
-        digest = hashlib.new(hash_name)
-        digest.update(archive_fp.read())
-        archive_fp.close()
-        return digest.hexdigest()
-
     def get_preferred_hash_name(self):
         """Returns the string name of the hashlib-supported checksum algorithm
         to use"""
         return "md5"
 
-    def display_results(self, archive, directory):
+    def display_results(self, archive, directory, checksum):
         # Display results is called from the tail of SoSReport.final_work()
         #
         # Logging is already shutdown and all terminal output must use the
@@ -312,19 +301,10 @@ def display_results(self, archive, directory):
 
         self._print()
 
-        hash_name = self.get_preferred_hash_name()
         if archive:
-            # store checksum into file
-            fp = open(archive + "." + hash_name, "w")
-            checksum = self._create_checksum(hash_name, archive)
-            if checksum:
-                fp.write(checksum + "\n")
-            fp.close()
-
             self._print(_("Your sosreport has been generated and saved "
                         "in:\n  %s") % archive)
         else:
-            checksum = None
             self._print(_("sosreport build tree is located at : %s" %
                         directory))
 

sos/sosreport.py

@@ -33,6 +33,7 @@
 from time import strftime, localtime
 from collections import deque
 import tempfile
+import hashlib
 
 from sos import _sos as _
 from sos import __version__
@@ -1432,6 +1433,18 @@ def postproc(self):
                     raise
                 self._log_plugin_exception(plugname, "postproc")
 
+    def _create_checksum(self, archive=None):
+        if not archive:
+            return False
+
+        hash_name = self.policy.get_preferred_hash_name()
+
+        archive_fp = open(archive, 'rb')
+        digest = hashlib.new(hash_name)
+        digest.update(archive_fp.read())
+        archive_fp.close()
+        return digest.hexdigest()
+
     def final_work(self):
         # this must come before archive creation to ensure that log
         # files are closed and cleaned up at exit.
@@ -1466,7 +1479,18 @@ def final_work(self):
         else:
             directory = self.archive.get_archive_path()
 
-        self.policy.display_results(archive, directory)
+        hash_name = self.policy.get_preferred_hash_name()
+        checksum = None
+
+        if hash_name and not self.opts.build:
+            # store checksum into file
+            fp = open(archive + "." + hash_name, "w")
+            checksum = self._create_checksum(archive)
+            if checksum:
+                fp.write(checksum + "\n")
+            fp.close()
+
+        self.policy.display_results(archive, directory, checksum)
 
         self.tempfile_util.clean()
         return True