[Python-checkins] bpo-35308: Fix regression where BROWSER env var is not respected. (GH-10693)

Miss Islington (bot) webhook-mailer at python.org
Mon Nov 26 16:49:34 EST 2018


https://github.com/python/cpython/commit/2a37f013ec81099a6156160ce66803b2609bb7f4
commit: 2a37f013ec81099a6156160ce66803b2609bb7f4
branch: 3.7
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2018-11-26T13:49:28-08:00
summary:

bpo-35308: Fix regression where BROWSER env var is not respected. (GH-10693)


Regression introduced in e3ce695 and 25b804a, where the old parameter
update_tryorder to _synthesize was first ignored, then given the opposite
value in the attempt to fix bpo-31014.
(cherry picked from commit 8c281ed403fd915284d5bba2405d7c47f8195066)

Co-authored-by: Zhiming Wang <i at zhimingwang.org>

files:
A Misc/NEWS.d/next/Library/2018-11-24-10-33-42.bpo-35308.9--2iy.rst
M Lib/test/test_webbrowser.py
M Lib/webbrowser.py

diff --git a/Lib/test/test_webbrowser.py b/Lib/test/test_webbrowser.py
index 71f2e27467ee..519a9432abe0 100644
--- a/Lib/test/test_webbrowser.py
+++ b/Lib/test/test_webbrowser.py
@@ -309,6 +309,24 @@ def test_environment(self):
             webbrowser = support.import_fresh_module('webbrowser')
             webbrowser.get()
 
+    def test_environment_preferred(self):
+        webbrowser = support.import_fresh_module('webbrowser')
+        try:
+            webbrowser.get()
+            least_preferred_browser = webbrowser.get(webbrowser._tryorder[-1]).name
+        except (webbrowser.Error, AttributeError, IndexError) as err:
+            self.skipTest(str(err))
+
+        with support.EnvironmentVarGuard() as env:
+            env["BROWSER"] = least_preferred_browser
+            webbrowser = support.import_fresh_module('webbrowser')
+            self.assertEqual(webbrowser.get().name, least_preferred_browser)
+
+        with support.EnvironmentVarGuard() as env:
+            env["BROWSER"] = sys.executable
+            webbrowser = support.import_fresh_module('webbrowser')
+            self.assertEqual(webbrowser.get().name, sys.executable)
+
 
 if __name__=='__main__':
     unittest.main()
diff --git a/Lib/webbrowser.py b/Lib/webbrowser.py
index 1e27c83fd947..82bff835fdd0 100755
--- a/Lib/webbrowser.py
+++ b/Lib/webbrowser.py
@@ -86,7 +86,7 @@ def open_new_tab(url):
     return open(url, 2)
 
 
-def _synthesize(browser, *, preferred=True):
+def _synthesize(browser, *, preferred=False):
     """Attempt to synthesize a controller base on existing controllers.
 
     This is useful to create a controller when a user specifies a path to
@@ -563,7 +563,7 @@ def register_standard_browsers():
         # and prepend to _tryorder
         for cmdline in userchoices:
             if cmdline != '':
-                cmd = _synthesize(cmdline, preferred=False)
+                cmd = _synthesize(cmdline, preferred=True)
                 if cmd[1] is None:
                     register(cmdline, None, GenericBrowser(cmdline), preferred=True)
 
diff --git a/Misc/NEWS.d/next/Library/2018-11-24-10-33-42.bpo-35308.9--2iy.rst b/Misc/NEWS.d/next/Library/2018-11-24-10-33-42.bpo-35308.9--2iy.rst
new file mode 100644
index 000000000000..a33fe2e4812b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-11-24-10-33-42.bpo-35308.9--2iy.rst
@@ -0,0 +1,2 @@
+Fix regression in ``webbrowser`` where default browsers may be preferred
+over browsers in the ``BROWSER`` environment variable.



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