defd5060d6
ssh-generator and ssh-proxy are great features, it is very handy to be
able to do:
ssh vsock/1
But, because of the '/' used as a separator, scp and rsync don't
interpret 'vsock/<CID>' as a hostname, e.g.
$ scp /etc/machine-id vsock/2222:.
cp: cannot create regular file 'vsock/2222:.': No such file or directory
$ rsync /etc/machine-id vsock/2222:.
rsync: [Receiver] change_dir#3 "(...)/vsock" failed: No such file or directory (2)
rsync error: errors selecting input/output files, dirs (code 3) at main.c(829) [Receiver=3.4.1]
An alternative is to use ',' as separator, e.g.
$ scp /etc/machine-id vsock,2222:.
This is what is being suggested here. The names with '/' are kept not to
break anything here.
Others are possible: '%', '=', '#', '@', ':', etc. As mentioned in
commit 0abd510f7f ("ssh-proxy: add ssh ProxyCommand tool that can
connect to AF_UNIX + AF_VSOCK sockets"), it is better to avoid ':' as it
is already taken by SSH itself when doing sftp, and "@" is already taken
for separating the user name. '#' will cause some issues with some
shells like ZSH when quotes are not used.
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