mirror of
https://github.com/go-gitea/gitea
synced 2024-11-04 21:29:12 +01:00
82 lines
2.5 KiB
Markdown
82 lines
2.5 KiB
Markdown
|
# ssh_config
|
||
|
|
|
||
|
|
This is a Go parser for `ssh_config` files. Importantly, this parser attempts
|
||
|
|
to preserve comments in a given file, so you can manipulate a `ssh_config` file
|
||
|
|
from a program, if your heart desires.
|
||
|
|
|
||
|
|
It's designed to be used with the excellent
|
||
|
|
[x/crypto/ssh](https://golang.org/x/crypto/ssh) package, which handles SSH
|
||
|
|
negotiation but isn't very easy to configure.
|
||
|
|
|
||
|
|
The `ssh_config` `Get()` and `GetStrict()` functions will attempt to read values
|
||
|
|
from `$HOME/.ssh/config` and fall back to `/etc/ssh/ssh_config`. The first
|
||
|
|
argument is the host name to match on, and the second argument is the key you
|
||
|
|
want to retrieve.
|
||
|
|
|
||
|
|
```go
|
||
|
|
port := ssh_config.Get("myhost", "Port")
|
||
|
|
```
|
||
|
|
|
||
|
|
You can also load a config file and read values from it.
|
||
|
|
|
||
|
|
```go
|
||
|
|
var config = `
|
||
|
|
Host *.test
|
||
|
|
Compression yes
|
||
|
|
`
|
||
|
|
|
||
|
|
cfg, err := ssh_config.Decode(strings.NewReader(config))
|
||
|
|
fmt.Println(cfg.Get("example.test", "Port"))
|
||
|
|
```
|
||
|
|
|
||
|
|
Some SSH arguments have default values - for example, the default value for
|
||
|
|
`KeyboardAuthentication` is `"yes"`. If you call Get(), and no value for the
|
||
|
|
given Host/keyword pair exists in the config, we'll return a default for the
|
||
|
|
keyword if one exists.
|
||
|
|
|
||
|
|
### Manipulating SSH config files
|
||
|
|
|
||
|
|
Here's how you can manipulate an SSH config file, and then write it back to
|
||
|
|
disk.
|
||
|
|
|
||
|
|
```go
|
||
|
|
f, _ := os.Open(filepath.Join(os.Getenv("HOME"), ".ssh", "config"))
|
||
|
|
cfg, _ := ssh_config.Decode(f)
|
||
|
|
for _, host := range cfg.Hosts {
|
||
|
|
fmt.Println("patterns:", host.Patterns)
|
||
|
|
for _, node := range host.Nodes {
|
||
|
|
// Manipulate the nodes as you see fit, or use a type switch to
|
||
|
|
// distinguish between Empty, KV, and Include nodes.
|
||
|
|
fmt.Println(node.String())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Print the config to stdout:
|
||
|
|
fmt.Println(cfg.String())
|
||
|
|
```
|
||
|
|
|
||
|
|
## Spec compliance
|
||
|
|
|
||
|
|
Wherever possible we try to implement the specification as documented in
|
||
|
|
the `ssh_config` manpage. Unimplemented features should be present in the
|
||
|
|
[issues][issues] list.
|
||
|
|
|
||
|
|
Notably, the `Match` directive is currently unsupported.
|
||
|
|
|
||
|
|
[issues]: https://github.com/kevinburke/ssh_config/issues
|
||
|
|
|
||
|
|
## Errata
|
||
|
|
|
||
|
|
This is the second [comment-preserving configuration parser][blog] I've written, after
|
||
|
|
[an /etc/hosts parser][hostsfile]. Eventually, I will write one for every Linux
|
||
|
|
file format.
|
||
|
|
|
||
|
|
[blog]: https://kev.inburke.com/kevin/more-comment-preserving-configuration-parsers/
|
||
|
|
[hostsfile]: https://github.com/kevinburke/hostsfile
|
||
|
|
|
||
|
|
## Donating
|
||
|
|
|
||
|
|
Donations free up time to make improvements to the library, and respond to
|
||
|
|
bug reports. You can send donations via Paypal's "Send Money" feature to
|
||
|
|
kev@inburke.com. Donations are not tax deductible in the USA.
|