Error says: "Invalid Juliaup channel nightly"

[LilithHafner]

Huzzah! nightly is now a valid channel. This is so exciting!

However, when the nightly channel is not installed, it is mischaracterized as "invalid" instead of "not installed":

x@fedora:~$ julia +1.9.0
`1.9.0` is not installed. Please run `juliaup add 1.9.0` to install channel or version.
x@fedora:~$ julia +nightly
ERROR: Invalid Juliaup channel `nightly`. Please run `juliaup list` to get a list of valid channels and versions.
x@fedora:~$ juliaup list
 Channel                Version                           
----------------------------------------------------------
 0.6.1                  0.6.1+0.aarch64.linux.gnu         
 0.6.1~aarch64          0.6.1+0.aarch64.linux.gnu         
 0.6.2                  0.6.2+0.aarch64.linux.gnu         
 0.6.2~aarch64          0.6.2+0.aarch64.linux.gnu         
 ...
 beta~aarch64           1.10.0+0.aarch64.linux.gnu        
 lts                    1.6.7+0.aarch64.linux.gnu         
 lts~aarch64            1.6.7+0.aarch64.linux.gnu         
 rc                     1.10.0+0.aarch64.linux.gnu        
 rc~aarch64             1.10.0+0.aarch64.linux.gnu        
 release                1.10.0+0.aarch64.linux.gnu        
 release~aarch64        1.10.0+0.aarch64.linux.gnu        
 nightly                latest-linux-aarch64              
 nightly~aarch64        latest-linux-aarch64              
x@fedora:~$ juliaup add nightly
Installing Julia latest-linux-aarch64
x@fedora:~$ julia +nightly --startup-file=no
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.0-DEV.1458 (2024-02-02)
 _/ |\__'_|_|_|\__'_|  |  Commit 98e4f01d26e (0 days old master)
|__/                   |

julia> 

[christiangnrd]

Edit: See #995

I was working on the merge conflicts in rebasing #848 to main earlier and it got me wondering how PR channels should be considered.

Potential options I came up with:

1. Treat them like any invalid channel. (easy option)
2. Look online to see if it’s a valid pr with an uploaded build and show the uninstalled channel message. (Would have to connect to the internet for a step that doesn’t typically need to)
3. Find a concise way to explain that it may or may not be a valid channel that happens to be uninstalled. (Every phrasing I come up with for this feels sloppy and drawn out)

Any ideas?

[StefanKarpinski]

It seems reasonable to me to only know about the PRs available as of the last update. If you want a new PR do an update?