Use try...finally or with to ensure files get closed

Best practices state that you should use a mechanism that ensures files
get closed in case of any error, so let's do that.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

layerindex/bulkchange.py

@@ -55,16 +55,20 @@ def generate_patches(tinfoil, fetchdir, changeset, outputdir):
         (tmptarfd, tmptarname) = tempfile.mkstemp('.tar.gz', 'bulkchange-', outputdir)
         tmptarfile = os.fdopen(tmptarfd, "wb")
         tar = tarfile.open(None, "w:gz", tmptarfile)
+        try:
             for patch in patches:
                 patchfn = os.path.join(tmpoutdir, patch)
                 tar.add(patchfn, arcname=patch)
+        finally:
             tar.close()
         ret = tmptarname
     elif len(patches) == 1:
         (tmppatchfd, tmppatchname) = tempfile.mkstemp('.patch', 'bulkchange-', outputdir)
         tmppatchfile = os.fdopen(tmppatchfd, "wb")
+        try:
             with open(os.path.join(tmpoutdir, patches[0]), "rb") as patchfile:
                 shutil.copyfileobj(patchfile, tmppatchfile)
+        finally:
             tmppatchfile.close()
         ret = tmppatchname
 

layerindex/views.py

@@ -1457,6 +1457,7 @@ def task_log_view(request, task_id):
         f = open(os.path.join(settings.TASK_LOG_DIR, 'task_%s.log' % task_id), 'rb')
     except FileNotFoundError:
         raise Http404
+    try:
         f.seek(int(start))
         # We need to escape this or else things that look like tags in the output
         # will be interpreted as such by the browser
@@ -1476,6 +1477,8 @@ def task_log_view(request, task_id):
             response['Task-Done'] = '0'
             preader = utils.ProgressReader(settings.TASK_LOG_DIR, task_id)
             response['Task-Progress'] = preader.read()
+    finally:
+        f.close()
     return response
 
 def task_stop_view(request, task_id):

rrs/tools/rrs_distros.py

@@ -69,15 +69,13 @@ def search_package_in_distros(pkglst_dir, recipe, data):
         else:
             pn = recipe_name
 
-        f = open(os.path.join(pkglst_dir, distro_file), "r")
+        with open(os.path.join(pkglst_dir, distro_file), "r") as f:
             for line in f:
                 (pkg, section) = line.split(":")
                 if pn == pkg:
                     distro_complete = distro + "-" + section[:-1]
                     distros[distro_complete] = pn
-                f.close()
                     break
-        f.close()
 
     return distros
 

rrs/tools/rrs_maintainer_history.py

@@ -102,8 +102,9 @@ def maintainers_inc_history(options, logger, maintplan, layerbranch, repodir, la
                 utils.runcmd("git checkout %s -f" % commit,
                         repodir, logger=logger)
 
-                lines = [line.strip() for line in open(maintainers_full_path)]
-                for line in lines:
+                with open(maintainers_full_path, 'r') as f:
+                    for line in f:
+                        line = line.strip()
                         res = get_recipe_maintainer(line, logger)
                         if res:
                             (pn, name, email) = res