Update command returns before completing

[cog-videogames]

• I've verified and I assure that I'm running youtube-dl 2018.07.10
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

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Description of your issue, suggested solution and other information

I have a wrapper script that ensures yt-dl is up to date, which does the following on start (once per week):

echo 'Checking for update...'
youtube-dl --update

echo 'Ensure update is actually complete...'
sleep 10

echo 'Continuing...'

I do this because the --update command returns too soon. Here is the latest example:

Checking for update...
Updating to version 2018.07.10 ...
Waiting for file handle to be closed ...
Ensure update is actually complete...        # Note that this line
Updated youtube-dl to version 2018.07.10.    # is before this one!
Continuing...

It would be nice if the yt-dl update command waited until it was done before exiting.
Presumably some forked-off process is finishing the job?

This has been reproducible over many updates. Windows 7 on MINGW64 bash.

Apologies if this is already filed; as you can imagine searching for update issues is rough.

[dstftw]

That's not possible since youtube-dl.exe is already terminated when this message is printed from a batch file running in background.