f392a69a4b
Otherwise, every zsh instance on Fedora Kinoite and Silverblue was
running into:
/etc/profile.d/toolbox.sh:30: bad substitution
... because case modification with "${VARIANT_ID^}" is undefined in
POSIX shell [1], and doesn't work with Z shell.
Fedora Silverblue got its own PRETTY_NAME (and VARIANT and VARIANT_ID)
starting from Fedora 32 [2]. Therefore, it's better to use PRETTY_NAME
and let the downstream distributor of the host operating system decide
how it should be presented to the user, instead of coming up with a
custom string. eg., PRETTY_NAME isn't the same as "Fedora $VARIANT" on
Fedora Silverblue.
One nice side-effect of this is that while VARIANT and VARIANT_ID are
optional fields, PRETTY_NAME has a well-defined fallback value of
'Linux' [3]. This makes this a little less specific to Fedora Kinoite
and Silverblue.
The rest of the welcome text was reformatted to prevent it from getting
too wide depending on the contents of PRETTY_NAME.
Fallout from
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