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Message-ID:	<c76d21bf-7b9d-4f1c-803d-47d17a61cb7f@towo.net>
Date:	Sat, 16 Aug 2025 13:22:35 +0200
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To:	cygwin AT cygwin DOT com
Subject:	pty/terminfo dependency when running WSL
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From:	Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Thomas Wolff <towo AT towo DOT net>
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

There is an weird interworking issue when launching WSL from a minimal 
standalone installation of cygwin.
(It can be reproced with a full installation, though, see below).
When calling Windows-native wsl.exe, as implicitly done via mintty 
--WSL, and there is no terminfo database installed, something fails 
about pty setup, and the WSL shell will be run in pty-less mode (no 
prompt, no stty signal handling, ^C terminates the shell). When terminfo 
is present, everything works as expected.
Test case:
remove /usr/share/terminfo/78/$TERM (xterm or xterm-256color, or the 
whole subdirectory, or the 6d or 76 subdirectories when using 
TERM=mintty* or vt settings), i.e. move it to some saving place.
Run mintty --WSL, observe the issue described above.
Interestingly, cygwin shells are not affected by the issue, so some 
obscure interworking of the dreadful Windows ConPTY layer or so might 
contribute to the issue, but in any case I doubt that the presence of 
terminfo should affect the effective pty behaviour.
Thomas

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