chroot_scan: create result directory with appropriate permissions

To make the fix possible, we needed to make the result directory
creation method public.

Fixes: #1467

mock/py/mockbuild/buildroot.py

@@ -52,6 +52,7 @@ def wrapper(*args, **kwargs):
 
 
 class Buildroot(object):
+    # pylint: disable=too-many-public-methods,too-many-instance-attributes
     @traceLog()
     def __init__(self, config, uid_manager, state, plugins, bootstrap_buildroot=None, is_bootstrap=False):
         self.config = config
@@ -213,13 +214,18 @@ def _setup_basedir(self):
         os.chmod(self.basedir, 0o775)
 
     @traceLog()
-    def _setup_result_dir(self):
+    def create_resultdir(self):
+        """
+        (re)create self.resultdir directory with appropriate permissions
+        """
         self._setup_basedir()
         with self.uid_manager:
             try:
                 file_util.mkdirIfAbsent(self.resultdir)
-            except Error:
-                raise ResultDirNotAccessible(ResultDirNotAccessible.__doc__ % self.resultdir)
+            except Error as err:
+                raise ResultDirNotAccessible(
+                    ResultDirNotAccessible.__doc__ % self.resultdir
+                ) from err
 
 
     @traceLog()
@@ -300,7 +306,7 @@ def _init(self, prebuild):
         # intentionally we do not call bootstrap hook here - it does not have sense
         self._setup_nosync()
         self.chroot_was_initialized = self.chroot_is_initialized()
-        self._setup_result_dir()
+        self.create_resultdir()
         getLog().info("calling preinit hooks")
         self.plugins.call_hooks('preinit')
         # intentionally we do not call bootstrap hook here - it does not have sense
@@ -629,7 +635,7 @@ def resetLogging(self, force=False):
             return
         self.logging_initialized = True
 
-        self._setup_result_dir()
+        self.create_resultdir()
 
         with self.uid_manager:
             # attach logs to log files.

mock/py/mockbuild/plugins/chroot_scan.py

@@ -13,7 +13,7 @@
 
 # our imports
 from mockbuild.trace_decorator import getLog, traceLog
-from mockbuild import file_util, util
+from mockbuild import util
 
 requires_api_version = "1.1"
 
@@ -56,7 +56,7 @@ def __scanChroot(self):
         regexstr = "|".join(self.scan_opts['regexes'])
         regex = re.compile(regexstr)
         chroot = self.buildroot.make_chroot_path()
-        file_util.mkdirIfAbsent(self.resultdir)
+        self.buildroot.create_resultdir()
         count = 0
         logger = getLog()
         logger.debug("chroot_scan: Starting scan of %s", chroot)

releng/release-notes-next/unified-resultdir-preparation.bugfix

@@ -0,0 +1,5 @@
+Several internal code locations attempt to ensure that the result directory
+exists, creating it if necessary.  However, these locations handled it
+inconsistently, sometimes neglecting to [change the ownership][issue#1467] of
+the result directory.  Now, all locations use a single method dedicated to
+result directory preparation.