(part of)
commit 0019b6e68af9bda8b368a7073e5eb927607f00e2
Author: Sławomir Nizio <slawomir.nizio@sabayon.org>
Date:   Sat Mar 21 22:08:50 2020 +0100

    [entropy.misc, rigo] fix file-like objects with Python 3
    
    FakeOutFile and LogFile need .buffer like Python 3 "text" file objects
    which is needed when in rigo standard output/error is replaced, and then
    it reaches Portage which does this:
    
                if sys.hexversion >= 0x3000000 and fd in (sys.stdout, sys.stderr):
                        fd = fd.buffer
        fd.write(mystr)
    
    (/usr/lib64/python3.6/site-packages/portage/util/__init__.py).
    
    Entropy internal code did not need this.
    
    Note, after this commit, changes done previously:
        1)
        commit 0869912ec4c630d2946e835b2585367e233c1c15
    
            [entropy.spm] Rigo related Python 3 fix
    
              File "/usr/lib64/python3.6/site-packages/entropy/spm/plugins/interfaces/portage_plugin/__init__.py", line 101, in _pusher
                self._std.buffer.write(chunk)
            AttributeError: 'FakeOutFile' object has no attribute 'buffer'
    
        2)
        commit 8700aade27cb4117bf102afc7bd22ba6acfd8aa8
    
            [entropy.spm, rigo] Rigo related Python 3 fixes
    
            1)
              File "/usr/lib/python-exec/python3.6/RigoDaemon_app.py", line 362, in _pusher
                fobj.write(chunk)
            TypeError: write() argument must be str, not bytes
    
            2)
              File "/usr/lib64/python3.6/site-packages/entropy/spm/plugins/interfaces/portage_plugin/__init__.py", line 77, in __init__
                self.buffer = Writer(self, self._std.buffer)
            AttributeError: 'FakeOutFile' object has no attribute 'buffer'
    
        (...)
    
    could be likely reverted; not tested, it could be better to have them anyway to
    avoid futher re/encoding/checks if conversions are needed (subjective).
    
    Fixes bug 5899.

diff --git a/app/RigoDaemon_app.py b/app/RigoDaemon_app.py
index 39c4aeefe..33b45e5b8 100755
--- a/app/RigoDaemon_app.py
+++ b/app/RigoDaemon_app.py
@@ -79,7 +79,7 @@ from entropy.exceptions import DependenciesNotFound, \
     EntropyPackageException, InterruptError, RepositoryError
 from entropy.i18n import _
 from entropy.misc import LogFile, ParallelTask, TimeScheduled, \
-    ReadersWritersSemaphore
+    ReadersWritersSemaphore, FileobjCompatBuffer
 from entropy.fetchers import UrlFetcher, MultipleUrlFetcher
 from entropy.output import TextInterface, purple, teal
 from entropy.client.interfaces import Client
@@ -340,6 +340,10 @@ class FakeOutFile(object):
         self._app_mgmt_mutex = app_mgmt_mutex
         self._app_mgmt_notes = app_mgmt_notes
         self._rfd, self._wfd = os.pipe()
+
+        if const_is_python3():
+            self.buffer = FileobjCompatBuffer(self)
+
         task = ParallelTask(self._pusher)
         task.name = "FakeOutFilePusher"
         task.daemon = True