From 82fea5b42eadc4ac2d3f4f688613f140967e92b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Sat, 8 Feb 2020 19:36:55 +0700
Subject: [PATCH 1/2] [compat] Introduce compat_realpath (refs #23991)

---
 youtube_dl/compat.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
index c75ab131b..062b338d7 100644
--- a/youtube_dl/compat.py
+++ b/youtube_dl/compat.py
@@ -2754,6 +2754,17 @@ else:
         compat_expanduser = os.path.expanduser
 
 
+if compat_os_name == 'nt' and sys.version_info < (3, 8):
+    # os.path.realpath on Windows does not follow symbolic links
+    # prior to Python 3.8 (see https://bugs.python.org/issue9949)
+    def compat_realpath(path):
+        while os.path.islink(path):
+            path = os.path.abspath(os.readlink(path))
+        return path
+else:
+    compat_realpath = os.path.realpath
+
+
 if sys.version_info < (3, 0):
     def compat_print(s):
         from .utils import preferredencoding

From bfe2b8cf2ac57c6b66def2d5e0fc3fc424c78d75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Sat, 8 Feb 2020 19:38:36 +0700
Subject: [PATCH 2/2] [update] Fix updating via symlinks (closes #23991)

---
 youtube_dl/compat.py | 1 +
 youtube_dl/update.py | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
index 062b338d7..d1b86bd13 100644
--- a/youtube_dl/compat.py
+++ b/youtube_dl/compat.py
@@ -3009,6 +3009,7 @@ __all__ = [
     'compat_os_name',
     'compat_parse_qs',
     'compat_print',
+    'compat_realpath',
     'compat_setenv',
     'compat_shlex_quote',
     'compat_shlex_split',
diff --git a/youtube_dl/update.py b/youtube_dl/update.py
index 002ea7f33..84c964617 100644
--- a/youtube_dl/update.py
+++ b/youtube_dl/update.py
@@ -9,6 +9,7 @@ import subprocess
 import sys
 from zipimport import zipimporter
 
+from .compat import compat_realpath
 from .utils import encode_compat_str
 
 from .version import __version__
@@ -84,7 +85,9 @@ def update_self(to_screen, verbose, opener):
     print_notes(to_screen, versions_info['versions'])
 
     # sys.executable is set to the full pathname of the exe-file for py2exe
-    filename = sys.executable if hasattr(sys, 'frozen') else sys.argv[0]
+    # though symlinks are not followed so that we need to do this manually
+    # with help of realpath
+    filename = compat_realpath(sys.executable if hasattr(sys, 'frozen') else sys.argv[0])
 
     if not os.access(filename, os.W_OK):
         to_screen('ERROR: no write permissions on %s' % filename)