Local cookie file erased after ENOSPC error

[cmcginty]

Checklist

• I'm reporting a broken site support issue
• [ x] I've verified that I'm running youtube-dl version 2021.06.06
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• [ x] I've searched the bugtracker for similar bug reports including closed ones
• [ x] I've read bugs section in FAQ

Verbose log

Traceback (most recent call last): File "/usr/local/bin/yt-dlp", line 33, in
sys.exit(load_entry_point('yt-dlp==2021.10.10', 'console_scripts', 'yt-dlp')())
File "/usr/local/Cellar/yt-dlp/2021.10.10/libexec/lib/python3.10/site-packages/yt_dlp/init.py", line 779, in main
_real_main(argv)
File "/usr/local/Cellar/yt-dlp/2021.10.10/libexec/lib/python3.10/site-packages/yt_dlp/init.py", line 740, in _real_main
with YoutubeDL(ydl_opts) as ydl:
File "/usr/local/Cellar/yt-dlp/2021.10.10/libexec/lib/python3.10/site-packages/yt_dlp/Yo
utubeDL.py", line 782, in exit
self.cookiejar.save(ignore_discard=True, ignore_expires=True)
File "/usr/local/Cellar/yt-dlp/2021.10.10/libexec/lib/python3.10/site-packages/yt_dlp/ut
ils.py", line 2889, in save
with io.open(filename, 'w', encoding='utf-8') as f:
OSError: [Errno 28] No space left on device

Description

Run program using cookie file option. After disk space error exception, cookie file is erased.

[dirkf]

Although you are reporting this issue with yt-dlp in the wrong tracker, the same heinous bug is present in yt-dl at l.2775 of the current utils.py.

Plainly running the command with more available space is one solution, but it would certainly be more polite to retain the supplied cookie file and not erase it each time it's opened.

As the log shows, the cookie file is opened with mode w which truncates the file; the update mode r+ could help but the code then has to seek to the start of the file and truncate it before closing.