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parse ssh host info from per host string using 'net/url' #143

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1512ca0
parse host string with 'net/url'
kadefor Jun 11, 2018
8118b09
check err when get port
kadefor Jun 12, 2018
608c101
parse env from host string
kadefor Jun 12, 2018
5884c60
set ssh client's user when user in host string
kadefor Jun 12, 2018
38cad8e
fix logic when set default port
kadefor Jun 13, 2018
6d0e7ce
change host 'info' variable name to 'hostURL'
kadefor Jun 13, 2018
18fe97f
disable parse env from host url
kadefor Jun 13, 2018
5ad1410
refactor host url parse
kadefor Jun 15, 2018
bf2dc98
fix a bug when get user from host url
kadefor Jun 18, 2018
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43 changes: 29 additions & 14 deletions ssh.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import (
"io"
"io/ioutil"
"net"
"net/url"
"os"
"os/user"
"path/filepath"
Expand Down Expand Up @@ -43,16 +44,23 @@ func (e ErrConnect) Error() string {

// parseHost parses and normalizes <user>@<host:port> from a given string.
func (c *SSHClient) parseHost(host string) error {
c.host = host
if !strings.Contains(host, "://") {
host = "ssh://" + host
}

info, err := url.Parse(host)
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@VojtechVitek VojtechVitek Jun 13, 2018

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can we call this u or url?

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@kadefor kadefor Jun 13, 2018

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the object is about host info, can we change the variable name to "h" or "hostInfo"?

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@VojtechVitek VojtechVitek Jun 13, 2018

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it's host URL :) I prefer u, url or hostURL if you want to be more specific

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@kadefor kadefor Jun 13, 2018

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it's the same name, "url" and package "net/url". I'll use the "hostURL" :-)

if err != nil {
return err
}

// Remove extra "ssh://" schema
if len(c.host) > 6 && c.host[:6] == "ssh://" {
c.host = c.host[6:]
c.host = info.Host
if u := info.User.Username(); u != "" {
c.user = u
}
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@VojtechVitek VojtechVitek Jun 13, 2018

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This is nice refactor, thanks!


if at := strings.Index(c.host, "@"); at != -1 {
c.user = c.host[:at]
c.host = c.host[at+1:]
// Add default port, if not set
if _, p, err := net.SplitHostPort(info.Host); err != nil && p == "" {
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@VojtechVitek VojtechVitek Jun 13, 2018

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this condition looks suspicious

should this be err == nil && p == ""?

or err != nil || p == "" ?

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@kadefor kadefor Jun 13, 2018 •
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oh, It's my mistake! Thanks for your review! :-)

c.host += ":22"
}

// Add default user, if not set
Expand All @@ -64,13 +72,20 @@ func (c *SSHClient) parseHost(host string) error {
c.user = u.Username
}

if strings.Index(c.host, "/") != -1 {
return ErrConnect{c.user, c.host, "unexpected slash in the host URL"}
}

// Add default port, if not set
if strings.Index(c.host, ":") == -1 {
c.host += ":22"
c.env = c.env + `export SUP_HOST="` + c.host + `";`
if m, _ := url.ParseQuery(info.RawQuery); len(m) > 0 {
for k, vs := range m {
if len(vs) == 0 || vs[len(vs)-1] == "" {
continue
}

v := vs[len(vs)-1]
if (v[0] == '\'' && v[len(v)-1] == '\'') || (v[0] == '"' && v[len(v)-1] == '"') {
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@VojtechVitek VojtechVitek Jun 13, 2018

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I'm not sure what this complex condition is for.

Why don't you strings.Trim() it without these checks?

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@kadefor kadefor Jun 13, 2018 •
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the reason is the difference between ' and " in shell

example:

ssh://root:123@456@192.168.16.10:22/~/.ssh/id_rsa?MY_VAR="aa bb cc dd"&ABC_VAR='help, run: echo $HOME'&XYZ_VAR="my home dir is $HOME"&other_var='abc$xyz'

if no the 'complex condition' and just use strings.Trim(), the shell variable in c.env will be:

export MY_VAR="aa bb cc dd"; 
export ABC_VAR="help, run: echo $HOME"; 
export XYZ_VAR="my home dir is $HOME"; 
export other_var="abc$xyz";

but, I want:

export MY_VAR="aa bb cc dd";
export ABC_VAR='help, run: echo $HOME'; 
export XYZ_VAR="my home dir is $HOME"; 
export other_var='abc$xyz';

the difference:

mac-dev:~ kadefor$ abc='help, run: echo $HOME'
mac-dev:~ kadefor$ echo $abc
help, run: echo $HOME

mac-dev:~ kadefor$ abc="help, run: echo $HOME"
mac-dev:~ kadefor$ echo $abc
help, run: echo /Users/kadefor

mac-dev:~ kadefor$ abc='abc$xyz'
mac-dev:~ kadefor$ echo $abc
abc$xyz

mac-dev:~ kadefor$ abc="abc$xyz"
mac-dev:~ kadefor$ echo $abc
abc

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@VojtechVitek VojtechVitek Jun 13, 2018

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Sorry, I don't understand what ssh://root:123@456@192.168.16.10:22/~/.ssh/id_rsa?MY_VAR="aa bb cc dd"&ABC_VAR='help, run: echo $HOME'&XYZ_VAR="my home dir is $HOME"&other_var='abc$xyz' represents.

We should be parsing pure SSH connection string. Imho, there shouldn't be any path after the [scheme://username:passwd@]host[:port].

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@kadefor kadefor Jun 13, 2018

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I think it is a way to set env for per host, currently. If have a new and better method in the future( save host info to struct in Supfile?), we can disable the feature.

Need to disable it in this PR now? :-)

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@VojtechVitek VojtechVitek Jun 13, 2018

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you can set env vars via Supfile :)

imho we should just strip off hostUrl.Path

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@kadefor kadefor Jun 13, 2018

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currently, how to set env for per host in Supfile? (about #111)

Could I leave it as an experimental function? If not, remove it :-D

Thank you for your review, again!

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@VojtechVitek VojtechVitek Jun 13, 2018 •
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Interesting, I don't think sup supports setting env vars per host right now. It supports setting env vars globally or per network.

Yes please, remove this feature for now. You can create a new issue for it and we'll see if there's any more interest for it out there. I doubt it, though.

We might think about per-host env vars, though. I like it.

Or, I think you could even set those env vars on the server side in the ~/.ssh/authorized_keys file:
command="export VAR=1; /bin/sh" ssh-key

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@kadefor kadefor Jun 13, 2018

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ok, I'll remove it. Thanks for your suggestions! :)

c.env = c.env + fmt.Sprintf(`export %s=%s; `, k, vs[len(vs)-1])
} else {
c.env = c.env + fmt.Sprintf(`export %s="%s"; `, k, strings.Trim(vs[len(vs)-1], `'"`))
}
}
}

return nil
Expand Down
2 changes: 1 addition & 1 deletion sup.go
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ func (sup *Stackup) Run(network *Network, envVars EnvList, commands ...*Command)

// SSH client.
remote := &SSHClient{
env: env + `export SUP_HOST="` + host + `";`,
env: env,
user: network.User,
color: Colors[i%len(Colors)],
}
Expand Down