flatpak: add tests in CI, add no_dependencies parameter (#2751)

* Similar version restrictions than flatpak_remote tests.

* ...

* Try to work around missing dependencies.

* Revert "Try to work around missing dependencies."

This reverts commit 66a4e38566.

* Add changelog.

* App8 -> App2; make sure that there are two apps App1 and App2.

* Fix forgotten variabe.

* Remove test notices.

* Seems like flatpak no longer supports file:// URLs.

The tests would need to be rewritten to offer the URL via http:// instead.

* Try local HTTP server for URL tests.

* ...

* Lint, add status check.

* Add boilerplate.

* Add 'ps aux'.

* Surrender to -f.

* Work around apparent flatpak bug.

* Fix YAML.

* Improve condition.

* Make sure test reruns behave better.

tests/integration/targets/flatpak/files/serve.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import posixpath
+import sys
+
+try:
+    from http.server import SimpleHTTPRequestHandler, HTTPServer
+    from urllib.parse import unquote
+except ImportError:
+    from SimpleHTTPServer import SimpleHTTPRequestHandler
+    from BaseHTTPServer import HTTPServer
+    from urllib import unquote
+
+
+# Argument parsing
+if len(sys.argv) != 4:
+    print('Syntax: {0} <bind> <port> <path>'.format(sys.argv[0]))
+    sys.exit(-1)
+
+HOST, PORT, PATH = sys.argv[1:4]
+PORT = int(PORT)
+
+
+# The HTTP request handler
+class Handler(SimpleHTTPRequestHandler):
+    def translate_path(self, path):
+        # Modified from Python 3.6's version of SimpleHTTPRequestHandler
+        # to support using another base directory than CWD.
+
+        # abandon query parameters
+        path = path.split('?', 1)[0]
+        path = path.split('#', 1)[0]
+        # Don't forget explicit trailing slash when normalizing. Issue17324
+        trailing_slash = path.rstrip().endswith('/')
+        try:
+            path = unquote(path, errors='surrogatepass')
+        except (UnicodeDecodeError, TypeError) as exc:
+            path = unquote(path)
+        path = posixpath.normpath(path)
+        words = path.split('/')
+        words = filter(None, words)
+        path = PATH
+        for word in words:
+            if os.path.dirname(word) or word in (os.curdir, os.pardir):
+                # Ignore components that are not a simple file/directory name
+                continue
+            path = os.path.join(path, word)
+        if trailing_slash:
+            path += '/'
+        return path
+
+
+# Run simple HTTP server
+httpd = HTTPServer((HOST, PORT), Handler)
+
+try:
+    httpd.serve_forever()
+except KeyboardInterrupt:
+    pass
+
+httpd.server_close()