Comments (5)
My confusion stems from the following. SSH manpage documents that options can only be specified before the server name:
ssh [-tons of options here] destination [command [argument ...]]
I had a look at source hcloud server ssh
code and indeed it appends the arguments to after the server name, and this I have confirmed by looking at process table:
hcloud server ssh <name> -v bash
runs
ssh -l root -p <ip> -v bash
which, I supposed, would try to run command -v
on the remote server.
But apparently and unexpectedly OpenSSH client accepts options even after the server name, only --
stops its option processing. TIL, after 25 years of using SSH! Worth documenting, yes.
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You should already be able to just do this:
$ hcloud server ssh myserver -v
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Aha, and the command is delimited by --
, I see, nice.
Should it be documented then?
from cli.
Aha, and the command is delimited by
--
, I see, nice.
Yes, this is the default behavior as described in the posix standard:
Guideline 10:
The first -- argument that is not an option-argument should be accepted as a delimiter indicating the end of options. Any following arguments should be treated as operands, even if they begin with the '-' character.
And it is implemented by spf13/cobra, the CLI framework we use.
Should it be documented then?
Since this behavior is not unique to the hcloud CLI and we don't even implement it ourselves, I don't know if documenting it would make sense. This is how the documentation looks like right now:
Usage:
hcloud server ssh [options] <server> [command...]
Flags:
-h, --help help for ssh
--ipv6 Establish SSH connection to IPv6 address
-p, --port int Port for SSH connection (default 22)
-u, --user string Username for SSH connection (default "root")
I agree that it is not instantly apparent that you can pass flags to the ssh
binary using the [command...]
.
Maybe something like this is better:
Usage:
hcloud server ssh [options] <server> [ssh options] [command [argument...]]
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Related Issues (20)
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