bpo-28334: fix netrc not working when $HOME is not set #123

dmerejkowsky · 2017-02-15T20:32:47Z

https://bugs.python.org/issue28334

the-knights-who-say-ni · 2017-02-15T20:32:48Z

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dmerejkowsky · 2017-02-15T20:36:11Z

As discussed during patch review, no tests were added, but doc was updated.

dmerejkowsky · 2017-02-15T20:40:15Z

@the-knights-who-say-ni :
Added my github username on bugs.python.org as requested.

berkerpeksag

Thanks for the PR, but like I said in review we can't accept this without a test case.

It should be easy to test at least the FileNotFoundError case by changing $HOME env variable.

berkerpeksag · 2017-02-19T14:47:59Z

Doc/library/netrc.rst

@@ -32,6 +32,10 @@ the Unix :program:`ftp` program and other FTP clients.

   .. versionchanged:: 3.4 Added the POSIX permission check.

+   .. versionchanged:: 3.7 Now uses :func:`os.path.expanduser`, so if


Style nit:

.. versionchanged:: 3.7 Now uses :func:`os.path.expanduser`, so if [...]

dmerejkowsky · 2017-02-20T19:15:54Z

Rebased, added a test, and fix doc style as requested.

zhangyangyu · 2017-03-08T09:26:42Z

Lib/test/test_netrc.py

@@ -123,6 +123,15 @@ def test_security(self):
            os.chmod(fn, 0o622)
            self.assertRaises(netrc.NetrcParseError, netrc.netrc)

+    def test_when_not_found(self):


I would like the name just test_file_not_found.

zhangyangyu · 2017-03-08T09:28:57Z

Lib/test/test_netrc.py

+        with support.EnvironmentVarGuard() as environ:
+            environ.set('HOME', d)
+            self.assertRaises(FileNotFoundError, netrc.netrc)
+


When you explicitly pass a not exist file, it could also raise the error.

OK. I wrote an other test for this. (I like to follow the 'one assert per test' rule)

zhangyangyu · 2017-03-13T03:32:40Z

LGTM. But I'd wait for others' reviews for some time. And I want to treat this as an enhancement though it looks like a bug on Windows.

berkerpeksag

Thanks! Looks good to me, just left some minor comments. Also, since this a behavior change we need to add a note to Misc/NEWS.

berkerpeksag · 2017-03-15T14:16:13Z

Doc/library/netrc.rst

@@ -32,6 +32,11 @@ the Unix :program:`ftp` program and other FTP clients.

   .. versionchanged:: 3.4 Added the POSIX permission check.

+   .. versionchanged:: 3.7
+      Now uses :func:`os.path.expanduser`, so if :envvar:`HOME` is not


I think the "if :envvar:HOME is not set [...]" part should be moved to the main documentation block and the versionchanged annotation should only mention that it now uses expanduser() to determine the location of the .netrc file if *file* is not passed.

Makes sense.

berkerpeksag · 2017-03-15T14:19:44Z

Doc/library/netrc.rst

@@ -32,6 +32,11 @@ the Unix :program:`ftp` program and other FTP clients.

   .. versionchanged:: 3.4 Added the POSIX permission check.

+   .. versionchanged:: 3.7
+      Now uses :func:`os.path.expanduser`, so if :envvar:`HOME` is not
+      set *and* ``~/.netrc`` not found,  will raise


Double spaces before "will".

oups, sorry :)

berkerpeksag · 2017-03-15T14:21:10Z

Lib/test/test_netrc.py

+            self.assertRaises(FileNotFoundError, netrc.netrc)
+
+    def test_file_not_found_explicit(self):
+        unlikely_file = "unlikely_netrc"


No need to use unlikely_file here. Just pass "unlikely_netrc" to the constructor.

dmerejkowsky · 2017-03-24T09:56:09Z

@berkerpeksag rebased and conformed with your latest comments

zhangyangyu · 2017-04-10T10:01:31Z

Doc/library/netrc.rst

-   no argument is given, the file :file:`.netrc` in the user's home directory will
-   be read.  Parse errors will raise :exc:`NetrcParseError` with diagnostic
+   no argument is given, the file :file:`.netrc` in the user's home directory --
+   as returned by :func:`os.path.expanduser` -- will be read. If the file is not found, will raise


Two spaces before "If the file ...".

zhangyangyu · 2017-04-10T10:08:07Z

Misc/NEWS

@@ -1046,6 +1046,8 @@ Core and Builtins
 Library
 -------

+- bpo-28334: fix netrc not working when $HOME is not set


Uppercase please and colon at end. And instead of fixing, I'd rather something like "Use os.path.expanduser rather than barely checking $HOME is set or not when no argument is given to netrc.netrc().". Ignore my wording, I am not a native speaker. :-(

Also done. It's a bit long, but I hope it documents precisely the new behavior

dmerejkowsky · 2017-04-10T11:30:41Z

@zhangyangyu Thanks for the suggestions! It's worth making sure the documentation is as best as possible :)
Rebased and changed as requested.

zhangyangyu · 2017-04-10T15:25:34Z

Misc/NEWS

@@ -1125,6 +1125,11 @@ Core and Builtins
 Library
 -------

+- bpo-28334: Use os.path.expanduser() to find the ~/.netrc file in netrc.netrc().


Too wordy. Just

bpo-28334: Use os.path.expanduser() to find the ~/.netrc file in netrc.netrc().
If the file does not exist, a FileNotFoundError is raised.

serhiy-storchaka · 2017-04-10T16:37:25Z

Doc/library/netrc.rst

-   be read.  Parse errors will raise :exc:`NetrcParseError` with diagnostic
+   no argument is given, the file :file:`.netrc` in the user's home directory --
+   as returned by :func:`os.path.expanduser` -- will be read.  If the file is
+   not found, will raise :exc:`FileNotFoundError`.


There are many causes why the file can't be read. It can be a directory or broken symlink, or user can not have permissions to read it. Different OSError subclasses are raised in these cases. I think no need to specify this is explicitly. Exceptions that can be raised by the function are rarely documented in Python docs.

Fair enough. I removed the sentence.

serhiy-storchaka · 2017-04-10T16:45:12Z

Lib/test/test_netrc.py

+        os.mkdir(d)
+        self.addCleanup(support.rmtree, d)
+        with support.EnvironmentVarGuard() as environ:
+            environ.set('HOME', d)


This doesn't test a new behavior. Needed a test for the case when HOME is not set.

This doesn't test a new behavior

I think it does. It checks the type of the exception raised, which is the whole point of this patch,
getting rid of the weird 'OSError' about HOME not set ...

Needed a test for the case when HOME is not set.

Yeah I was not sure about this one. I've added a test where I monkeypatch os.path.expanduser, but I'm not sure it's useful. My guts tell me such a test is too close to the implementation.

Serhiy is right that we need a test for this case and unless I'm missing something you can do it without doing any mocking:

with support.EnvironmentVarGuard() as environ: environ.unset('HOME') self.assertRaises(FileNotFoundError, netrc.netrc)

dmerejkowsky · 2017-04-11T19:47:35Z

Wrote a test monkeypatching os.path.expanduser. Maybe we can keep it after all.
You tell me ;)

dmerejkowsky · 2017-04-26T13:26:05Z

@serhiy-storchaka @berkerpeksag @terryjreedy gentle reminder :)

louisom · 2017-04-26T15:02:09Z

@dmerejkowsky For reminding, you don't need to squash your commit every change makes, all commit will be squash when the PR is merged. See devguide last paragraph.

berkerpeksag · 2017-04-26T15:07:44Z

Lib/test/test_netrc.py

+        os.chmod(fake_netrc_path, 0o600)
+        with support.EnvironmentVarGuard() as environ:
+            environ.unset('HOME')
+            with mock.patch('os.path.expanduser') as mock_expanduser:


Mocking os.path.expanduser is not needed here in my opinion. If you can change the test to

def test_home_not_set(self): with support.EnvironmentVarGuard() as environ: environ.unset('HOME') self.assertRaises(FileNotFoundError, netrc.netrc)

then we are good to go! :)

I'm afraid not. If we unset HOME and ~/.netrc does exist on the developer box, os.path.expanduser will read /etc/passwd using pwd (see [1]) and no exception will be raised. I'd prefer the tests to not depend on what's on the home directory of the user running the tests.

[1]: https://github.com/python/cpython/blob/master/Lib/posixpath.py#L245-L247

berkerpeksag · 2017-04-26T15:08:57Z

Misc/NEWS

@@ -1125,6 +1125,9 @@ Core and Builtins
 Library
 -------

+- bpo-28334: Use os.path.expanduser() to find the ~/.netrc file in netrc.netrc().


~/.netrc -> ``~/.netrc``

(otherwise our doc build will complain)

berkerpeksag · 2017-04-26T15:12:44Z

@dmerejkowsky and just one more comment: Please add your name to Misc/ACKS.

serhiy-storchaka · 2017-04-27T15:14:23Z

Doc/library/netrc.rst

-   no argument is given, the file :file:`.netrc` in the user's home directory will
-   be read.  Parse errors will raise :exc:`NetrcParseError` with diagnostic
+   no argument is given, the file :file:`.netrc` in the user's home directory --
+   as returned by :func:`os.path.expanduser` -- will be read.


Maybe "as determined"? expanduser() itself doesn't return the user's home directory.

Or "as returned by os.path.expanduser('~') ", but this exposes more implementation details and is harder to format as a reference.

I like 'determined', thanks :)

serhiy-storchaka · 2017-04-27T15:21:56Z

Lib/netrc.py

-                file = os.path.join(os.environ['HOME'], ".netrc")
-            except KeyError:
-                raise OSError("Could not find .netrc: $HOME is not set") from None
+            file = os.path.expanduser("~/.netrc")


'/' is Posix specific pathname separator. Windows accepts it too, but it is better to use the native pathname separator, os.sep. Or use os.path.join():

os.path.expanduser(os.path.join("~", ".netrc"))

or

os.path.join(os.path.expanduser("~"), ".netrc")

serhiy-storchaka · 2017-04-27T15:31:07Z

Doc/library/netrc.rst

@@ -32,6 +33,10 @@ the Unix :program:`ftp` program and other FTP clients.

   .. versionchanged:: 3.4 Added the POSIX permission check.

+   .. versionchanged:: 3.7
+      Now uses :func:`os.path.expanduser` to determine the location
+      of ``~/.netrc`` if *file* is not passed as argument.


~/.netrc is Posix-specific syntax. Windows users of netrc can even not know what ~/ means. Maybe "of the file :file:'.netrc'" of "of the default netrc file"?

serhiy-storchaka · 2017-04-27T15:39:37Z

Lib/test/test_netrc.py

+            environ.unset('HOME')
+            with mock.patch('os.path.expanduser') as mock_expanduser:
+                mock_expanduser.return_value = fake_netrc_path
+                nrc = netrc.netrc()


Check the content of nrc for testing that the configuration is read from the right file. Add a random data in the fake .netrc.

serhiy-storchaka · 2017-04-27T15:54:17Z

Misc/NEWS

@@ -1125,6 +1125,9 @@ Core and Builtins
 Library
 -------

+- bpo-28334: Use os.path.expanduser() to find the ``~/.netrc`` file in netrc.netrc().


Too long line.

Add "Patch by Dimitri Merejkowsky."

serhiy-storchaka · 2017-04-27T15:55:14Z

Misc/NEWS

@@ -1125,6 +1125,9 @@ Core and Builtins
 Library
 -------

+- bpo-28334: Use os.path.expanduser() to find the ``~/.netrc`` file in netrc.netrc().
+  If the file does not exist, a FileNotFoundError is raised.


Is this a new behavior?

Nope, fixed

serhiy-storchaka · 2017-04-27T15:59:03Z

Lib/test/test_netrc.py

+        os.chmod(fake_netrc_path, 0o600)
+        with support.EnvironmentVarGuard() as environ:
+            environ.unset('HOME')
+            with mock.patch('os.path.expanduser') as mock_expanduser:


This is too fragile. If rather than os.path.expanduser("~/.netrc") use one of variants suggested by me, the test will be broken.

I would monkey-patch expanduser with a code like the following:

orig_expanduser = os.path.expanduser called = [] def fake_expanduser(s): called.append(s) environ.set('HOME', d) result = orig_expanduser(s) environ.unset('HOME') return result with test.support.swap_attr(os.path, 'expanduser', fake_expanduser): nrc = netrc.netrc() self.assertTrue(called)

You're right, test is less likely to break this way.

That's a Python bug: http://bugs.python.org/issue28334 Most likely it will be fixed in Python 3.7: python/cpython#123

@zurfyx

* [cbsinteractive] fix extractor * [cbsinteractive] update test cases * [cbsinteractive] extract formats with `CBSIE` * [extractor/common] Fix rtmp and rtsp formats' URLs in _extract_wowza_formats * [vier] Extract more info Extract the `episode_number` and `upload_date`. Also extract the real `description`. * [vier] Relax regexes and extract more metadata (closes #12539) * [jsinterp] Add support for quoted names and indexers (closes #13123, closes #13130) * [ChangeLog] Actualize * release 2017.05.18 * [ChangeLog] Fix typo * [jsinterp] Fix typo and cleanup regexes (closes #13134) * [ChangeLog] Actualize * release 2017.05.18.1 * [mitele] Update app key regex * [hitbox] Add support for smashcast.tv (closes #13154) * [njpwworld] Fix extraction (closes #13162) * [toypics] Fix extraction * [toypics] Improve and modernize * [adobepass] Add support for Brighthouse MSO * [toggle] Relax _VALID_URL (closes #13172) * [youtube] Fix DASH manifest signature decryption (closes #8944) * [youtube] Modernize * [streamcz] Add support for subtitles * [downloader/external] Pass -loglevel to ffmpeg downloader (closes #13183) * Credit @zurfyx for atresplayer improvements (#12548) * Credit @mphe for streamango (#12643) * Credit @fredbourni for noovo (#12792) * [ChangeLog] Actualize * release 2017.05.23 * Credit @timendum for rai (#11790) and mediaset (#12964) * Credit @gritstub for vevo fix (#12879) * [cbsnews] fix extraction for 60 Minutes videos * [vimeo] Fix formats' sorting (closes #13189) * [postprocessor/ffmpeg] Fix metadata filename handling on Python 2 Fixes #13182 * [udemy] Fix extraction for outputs' format entries without URL (closes #13192) * [youku] Fix extraction (closes #13191) * [utils] Recognize more patterns in strip_jsonp() Used in Youku Show pages * [youku:show] Fix extraction * [tudou] Merge into youku extractor (fixes #12214) Also, there are no tudou playlists anymore. All playlist URLs points to youku playlists. * [bbc] Add support for authentication * Revert "[youtube] Don't use the DASH manifest from 'get_video_info' if 'use_cipher_signature' is True (#5118)" This reverts commit 87dc451. * [ChangeLog] Update after the fix for #11381 * [ChangeLog] Actualize * release 2017.05.26 * [cbsnews] Fix extraction (closes #13205) * [youku] Extract more metadata (closes #10433) * [adn] fix formats extraction * [utils] Drop an compatibility wrapper for Python < 2.6 addinfourl.getcode is added since Python 2.6a1. As youtube-dl now requires 2.6+, this is no longer necessary. See python/cpython@9b0d46d * [cbsinteractive] Relax _VALID_URL (closes #13213) * [beam:vod] Add extractor * [beam] Improve and add support for mixer.com (closes #13032) * [dvtv] Parse adaptive formats as well The old code hit an error when it attempted to parse the string "adaptive" for video height. Actually parsing the returned playlists is a good idea because it adds more output formats, including some audio-only-ones. * [dvtv] Improve and fix playlists support (closes #13063) * [medialaan] Fix videos with missing videoUrl A rough trick to get around the two different json styles medialaan seems to be using. Fix for these example videos: https://vtmkzoom.be/video?aid=45724 https://vtmkzoom.be/video?aid=45425 * [medialaan] PEP 8 (closes #12774) * [gaskrank] Fix extraction * [gaskrank] Improve (closes #12493) * [abcnews] Add support for embed URLs * [abcnews] Improve and remove duplicate test (closes #12851) * [xhamster] Extract categories (closes #11728) * [xhamster] Fix author and like/dislike count extraction * [xhamster] Simplify (closes #13216) * [youtube] Parse player_url if format URLs are encrypted or DASH MPDs are requested Fixes #13211 * [ChangeLog] Actualize * release 2017.05.29 * [README.md] Add an example for how to use .netrc on Windows That's a Python bug: http://bugs.python.org/issue28334 Most likely it will be fixed in Python 3.7: python/cpython#123 * [README.md] Mention http_dash_segments protocol * [packtpub] Fix authentication(closes #13240) * [drbonanza] Fix extraction (closes #13231) * [francetv] Relax _VALID_URL * [1tv] Lower preference for http formats (closes #13246) * [youtube] Improve chapters extraction (closes #13247) * [safari] Fix typo (closes #13252) * [YoutubeDL] Don't emit ANSI escape codes on Windows * [godtv] Remove extractor (closes #13175) * [pornhub:playlist] Fix extraction (closes #13281) * [pornhub:uservideos] Add missing raise * [bandcamp:weekly] Add extractor * [bandcamp:weekly] Improve and extract more metadata (closes #12758) * Credit @adamvoss for bandcamp:weekly (#12758) * Credit @mikf for beam:vod (#13032) * Credit @jktjkt for dvtv formats (#13063) * [ChangeLog] Actualize * release 2017.06.05 * [tvplayer] Fix extraction (closes #13291) * [rtlnl] Improve _VALID_URL (closes #13295) * [streamango] Make title optional * [streamango] Skip download for test (closes #13292) * [README.md] Clarify output template references (closes #13316) * [README.md] Improve man page formatting * [YoutubeDL] Sanitize more fields (#13313) * [liveleak] Ensure height is int (closes #13313) * [safari] Improve authentication detection (closes #13319) * [sohu] Fix numeric fields * [flickr] Ensure format id is string * [foxgay] Ensure height is int * [gfycat] Ensure filesize is int * [golem] Ensure format id is string * [jove] Ensure comment count is int * [sexu] Ensure height is int * [turbo] Ensure format id is string * [extractor/common] Return unicode string from _match_id * [extractor/generic] Ensure format id is unicode string * [msn] Fix formats extraction * [newgrounds] Improve formats and uploader extraction (closes #13346) * [newgrounds:playlist] Add extractor (closes #10611) * [utils] Improve unified_timestamp * [newgrounds] Extract more metadata (closes #13232) * [rutv] Add support for testplayer.vgtrk.com (closes #13347) * [xfileshare] Modernize and pass referrer * [xfileshare] Add support for rapidvideo (closes #13348) * [compat] Introduce compat_HTMLParseError * [utils] Handle HTMLParseError in extract_attributes (closes #13349) * [xfileshare] PEP 8 * [ChangeLog] Actualize * release 2017.06.12 * [compat] Add compat_HTMLParseError to __all__ * [corus] Add support for history.ca (closes #13359) * [corus] Add support for showcase.ca

During interpreter shutdown Stackless kills tasklets on daemon threads, if they have a non-trivial C-stack. This caused an assertion violation. https://bitbucket.org/stackless-dev/stackless/issues/123 (grafted from 9fd4f6a9d266250bef5baa692b89516e73b00e62)

berkerpeksag · 2017-11-24T08:26:41Z

I've fixed merge conflicts, created NEWS entry with blurb and made some cosmetic changes. Is there anything left to do here?

serhiy-storchaka · 2017-11-24T08:47:32Z

Lib/test/test_netrc.py

+        self.assertRaises(FileNotFoundError, netrc.netrc,
+                          file='unlikely_netrc')
+
+    def test_home_not_set(self):


Sorry, I don't understand how this test is related to the case when HOME is not set. Why not use the simple test suggested by @berkerpeksag above?

My suggested test won't work, because of the following code in expanduser:

if 'HOME' not in os.environ: import pwd userhome = pwd.getpwuid(os.getuid()).pw_dir

I have a .netrc file in my HOME directory so the test won't pass:

def test_foo(self): with support.EnvironmentVarGuard() as environ: environ.unset('HOME') self.assertRaises(FileNotFoundError, netrc.netrc)

====================================================================== FAIL: test_foo (test.test_netrc.NetrcTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/berker/projects/cpython/master/Lib/test/test_netrc.py", line 34, in test_foo self.assertRaises(FileNotFoundError, netrc.netrc) AssertionError: FileNotFoundError not raised by netrc

Thanks, now I see that this is the simplest platform-independent test.

Also add more tests to check that proper exceptions are raised

berkerpeksag · 2017-11-24T09:12:08Z

For some reason, Travis CI didn't pick up latest changes:

/home/travis/build/python/cpython/Doc/library/pyexpat.rst:872:Footnote [#] is not referenced.

Serhiy fixed it a while ago and I don't get any warnings in my development environment.

berkerpeksag · 2017-11-24T09:27:57Z

Ok, this looks like a Travis bug to me. I've opened PR #4537 and documentation build passed there.

@dmerejkowsky could you please create a new PR? If I merge PR #4537, GitHub overwrite author information and set me as author.

dmerejkowsky · 2017-11-24T18:15:49Z

@dmerejkowsky could you please create a new PR? If I merge PR #4537, GitHub overwrite author information and set me as author.

It's not a problem for me :) It was very nice of you to finish up my pull request, so by all means just merge your own and let GitHub set you as author of the patch, you deserve it.

What matters to me is to be listed in the ACKS file 😛

berkerpeksag · 2017-11-25T10:38:51Z

I've just merged PR #4537. Thank you for your work again, @dmerejkowsky. It took more than a year but we eventually fixed the bug :)

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bpo-28806: Improve the netrc library #127

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yan12125 added a commit to ytdl-org/youtube-dl that referenced this pull request May 29, 2017

[README.md] Add an example for how to use .netrc on Windows

d10d0e3

That's a Python bug: http://bugs.python.org/issue28334 Most likely it will be fixed in Python 3.7: python/cpython#123

akruis pushed a commit to akruis/cpython that referenced this pull request Sep 9, 2017

merge 3.4-slp (Stackless python#123)

5d88da3

akruis pushed a commit to akruis/cpython that referenced this pull request Sep 9, 2017

merge 3.3-slp (Stackless python#123)

2619d22

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bpo-28334: fix netrc not working when $HOME is not set

e8dde32

Also add more tests to check that proper exceptions are raised

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gvanrossum mentioned this pull request Aug 22, 2023

heap-use-after-free in _PyFunction_LookupByVersion #108253

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This was referenced Feb 11, 2025

segmentfault when pip installing setuptools #129992

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segmentfault when pip installing setuptools #129993

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		@@ -32,6 +32,10 @@ the Unix :program:`ftp` program and other FTP clients.

		.. versionchanged:: 3.4 Added the POSIX permission check.

		.. versionchanged:: 3.7 Now uses :func:`os.path.expanduser`, so if

bpo-28334: fix netrc not working when $HOME is not set #123

bpo-28334: fix netrc not working when $HOME is not set #123

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dmerejkowsky commented Feb 15, 2017 • edited by bedevere-bot Loading

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zhangyangyu commented Mar 13, 2017

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dmerejkowsky commented Mar 24, 2017

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dmerejkowsky commented Apr 10, 2017 • edited Loading

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berkerpeksag Apr 26, 2017 • edited Loading

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dmerejkowsky commented Apr 11, 2017

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louisom commented Apr 26, 2017

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berkerpeksag commented Apr 26, 2017

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dmerejkowsky Apr 28, 2017 • edited Loading

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berkerpeksag commented Nov 24, 2017

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berkerpeksag commented Nov 24, 2017

berkerpeksag commented Nov 24, 2017

dmerejkowsky commented Nov 24, 2017

berkerpeksag commented Nov 25, 2017

dmerejkowsky commented Feb 15, 2017 •

edited by bedevere-bot

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dmerejkowsky commented Apr 10, 2017 •

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berkerpeksag Apr 26, 2017 •

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dmerejkowsky Apr 28, 2017 •

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berkerpeksag Nov 24, 2017 •

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