install: download_fdroid_apk() to fetch the recommended initial APK

fdroidserver/install.py

@@ -72,6 +72,18 @@ def download_apk(appid='org.fdroid.fdroid'):
         return str(f.rename(f.with_stem(f'{appid}_{versionCode}')).resolve())
 
 
+def download_fdroid_apk():
+    """Directly download the current F-Droid APK and verify it.
+
+    This downloads the "download button" link, which is the version
+    that is best tested for new installs.
+
+    """
+    mirror = common.FDROIDORG_MIRRORS[0]
+    mirror['url'] = urlunparse(urlparse(mirror['url'])._replace(path='F-Droid.apk'))
+    return net.download_using_mirrors([mirror])
+
+
 def devices():
     p = SdkToolsPopen(['adb', "devices"])
     if p.returncode != 0:

tests/install.TestCase

@@ -7,6 +7,8 @@ import os
 import sys
 import unittest
 
+from pathlib import Path
+
 localmodule = os.path.realpath(
     os.path.join(os.path.dirname(inspect.getfile(inspect.currentframe())), '..')
 )
@@ -33,6 +35,11 @@ class InstallTest(unittest.TestCase):
         for device in devices:
             self.assertIsInstance(device, str)
 
+    @unittest.skipUnless(os.getenv('test_download_fdroid_apk'), 'requires net access')
+    def test_download_fdroid_apk(self):
+        f = fdroidserver.install.download_fdroid_apk()
+        self.assertTrue(Path(f).exists())
+
 
 if __name__ == "__main__":
     os.chdir(os.path.dirname(__file__))