> TERM=linux means Linux console, but that's just too much, as it not > only implies a multitude of ESC sequences specific to the Linux > console, but also indicates that certain ioctls might work. In our own > code we also bind certain behaviour to TERM=linux, as indicator if we > are on the Linux console. > > I am not aware of any widely-supported TERM value that would be a > reasonable subset of all currently used terminals and does color.
I did some more research and it turns out VT220 does support colors. My terminal emulator (Konsole) just doesn't seem to support it. I installed xterm (which explicitly advertises support for VT220 escape codes) and got colored output as expected. I guess this means it's up to Konsole to support more of VT220 if I want this to work seamlessly (or I switch terminals to xterm). Thanks for the extra info and context. Daan On Sat, 11 Jul 2020 at 20:04, Lennart Poettering <lenn...@poettering.net> wrote: > On Sa, 11.07.20 17:51, Daan De Meyer (daan.j.deme...@gmail.com) wrote: > > > Hi, > > > > I was playing around with mkosi's qemu support, more specifically adding > > the -nographic option to have the virtual machine output in my terminal > > instead of a separate window. After figuring out that I had to add > > console=ttyS0 to mkosi's kernel command line, I got the output from the > vm > > in my terminal as expected. However, because systemd defaults to > TERM=vt220 > > for serial consoles, the output is not colorized. I searched around a bit > > and found that this is done for compatibility reasons. Will there ever > be a > > point where we can switch the default to something that supports colors > > (like TERM=linux)? > > TERM=linux means Linux console, but that's just too much, as it not > only implies a multitude of ESC sequences specific to the Linux > console, but also indicates that certain ioctls might work. In our own > code we also bind certain behaviour to TERM=linux, as indicator if we > are on the Linux console. > > I am not aware of any widely-supported TERM value that would be a > reasonable subset of all currently used terminals and does color. > > > I managed to get around the problem by overriding serial-getty@ttyS0 and > > setting Environment=TERM=linux explicitly but it's a bit of a pain and > has > > to be added to every rootfs that wants to support colored output on its > > serial console. > > Unfortunately we can't guess the right terminal, we cannot propagate > TERM=xterm or TERM=linux depending if you invoke qemu on an xterm or > from a Linux console, hence the best thing we can do is stick to a > reasonably powerful subset that is likely going to exist everywhere, > and that's vt220 right now, as noone had a better suggestion so far... > > Lennart > > -- > Lennart Poettering, Berlin >
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