You can use IDNs (Internationalized Domain Names) with an http/https 
scheme, but when using them with the ssh scheme you get something like:

> $ darcs clone ìdn.example.org:repo
> 
> darcs failed:  Not a repository: ìdn.example.org:repo (The program 
> "scp -- ìdn.example.org:repo/_darcs/inventory ./darcs2722-2" failed 
> with error: "ssh: Could not resolve hostname \303\254dn.example.org: 
> Name or service not known
> scp: Connection closed
> ".)
> 
> HINT: Do you have the right URI for the repository?

This is because curl (used with http/https scheme) supports IDNA, but 
OpenSSH (the ssh implementation you'd likely use at least on *nix) 
doesn't. I don't know the outcome on Windows. I couldn't find any hints 
whether OpenSSH will support IDNA on a future version, if it already 
does on a version different from the ones I've tested, or if there's a 
configuration (compile time) switch for it.

For the record, git - being dependent on the same software - has the 
same issue.

FWIW, my take is that IDNs are a possible source of a lot of issues, so 
I will not complain they don't work with ssh schemes. On the contrary, 
I'm not particularly fond of them being accepted with http(s) schemes.

This is most likely a wontfix bug, I'm just filing it for documentation 
purposes.

Am 18.12.22 um 11:41 schrieb Gian Piero Carrubba:

> This is because curl (used with http/https scheme) supports IDNA, but

> OpenSSH (the ssh implementation you'd likely use at least on *nix)

> doesn't. I don't know the outcome on Windows. I couldn't find any hints

> whether OpenSSH will support IDNA on a future version, if it already

> does on a version different from the ones I've tested, or if there's a

> configuration (compile time) switch for it.

Also mostly for the record, we do not use any ssh library (Haskell, C or 

otherwise), at least not directly. Instead, accessing remote repos via 

ssh works by running the 'ssh', 'scp', or 'sftp' commands. The 

environment variables DARCS_SSH, DARCS_SCP, and DARCS_SFTP can be used 

to override the standard tools of your distro with other (command line 

compatible) implementations.

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