qa/tasks/vstart_runner,doc: be compatible with python3

[tchaikov]

Checklist

• References tracker ticket
• Updates documentation if necessary
• Includes tests for new functionality or reproducer for bug

---

Show available Jenkins commands

• jenkins retest this please
• jenkins test classic perf
• jenkins test crimson perf
• jenkins test signed
• jenkins test make check
• jenkins test make check arm64
• jenkins test submodules
• jenkins test dashboard
• jenkins test dashboard backend
• jenkins test docs
• jenkins render docs
• jenkins test ceph-volume all
• jenkins test ceph-volume tox

[alfonsomthd]

Tested locally running run-backend-api-tests.sh: it works.

[alfonsomthd]

@tchaikov For consistency, can you also update this line
https://github.com/ceph/ceph/blob/master/src/pybind/mgr/dashboard/run-backend-api-tests.sh#L44
to sth like:

virtualenv --python=${TEUTHOLOGY_PYTHON_BIN:-/usr/bin/python3} venv

[tchaikov]

sure. updated and repushed.

[tchaikov]

jenkins render docs

[lxbsz]

@tchaikov

Run # python3 ../qa/tasks/vstart_runner.py tasks.cephfs.test_volume_client.TestVolumeClient.test_get_authorized_ids failed for me.

I have paste the fixing patch, could you fix it here ?

diff --git a/qa/tasks/cephfs/fuse_mount.py b/qa/tasks/cephfs/fuse_mount.py
index 227d86e..cd05824 100644
--- a/qa/tasks/cephfs/fuse_mount.py
+++ b/qa/tasks/cephfs/fuse_mount.py
@@ -454,9 +454,9 @@ print(find_socket("{client_name}"))
 
         # Query client ID from admin socket
         json_data = self.client_remote.sh(
-            ['sudo', self._prefix + 'ceph', '--admin-daemon', asok_path] + args,
+            ['sudo', self._prefix + 'ceph', '--admin-daemon', asok_path.decode("utf-8")] + args,
             timeout=(15*60))
-        return json.loads(json_data)
+        return json.loads(json_data.decode("utf-8"))
 
     def get_global_id(self):
         """
diff --git a/qa/tasks/vstart_runner.py b/qa/tasks/vstart_runner.py
index 5dec6a6..c73ba04 100644
--- a/qa/tasks/vstart_runner.py
+++ b/qa/tasks/vstart_runner.py
@@ -390,7 +390,7 @@ class LocalRemote(object):
 
             # Hack: writing to stdin is not deadlock-safe, but it "always" works
             # as long as the input buffer is "small"
-            subproc.stdin.write(stdin)
+            subproc.stdin.write(stdin.encode())
 
         proc = LocalRemoteProcess(
             args, subproc, check_status,

[ceph-jenkins]

Doc render available at http://docs.ceph.com/ceph-prs/34636/

[tchaikov]

@lxbsz instead i am passing StringIO() for capturing stdout.

[lxbsz]

Tested and works for me.