Re: zpty woes

[Jaime Vargas <jev@mac.com>]

More strange behavior. In the script below, two different functions  
doTask and doShellTask are required because when invoking a shell  
script the prompt is repeated and if a read is not done twice then  
`zpty -d ch' will kill the session. This is kind of weird, the same  
happens with the `pwd' command.

Is there a way to avoid this "double prompt" problem? (It is kind of  
hard which commands would require double reads.)

#!/opt/csw/bin/zsh

# FLAGS
set -x                                           # Turn on to debug
zmodload zsh/zpty

# HELPERS
die () {print -r -- $1 >&2; exit 1;}

doTask () {
     zpty -w ch $1
     zpty -t ch || die "Error: command $1 didn't return"
     zpty -r ch line "*aoma6000-4-9? "
     print $line
}

doShellTask () {
     zpty -w ch $1
     zpty -t ch || die "Error: command $1 didn't return"
     zpty -r ch line "*aoma6000-4-9? "
     zpty -r ch line "*aoma6000-4-9? "
     print $line
}


# CREDENTIALS
user='user'
pass='topsecret'
supw='topsecret'
host='host'

# TASKS
task1='cat >test <<"EOF"
     #!/bin/zsh
     who -r
     uname -a
     echo hello >test2.out
EOF
chmod +x test
'

# CONNECT
zpty -b ch ssh -l ${user} ${host}
zpty -t ch || die "connection failed"
zpty -r ch line "*assword:" || die "no password asked"
zpty -w ch ${pass}
zpty -r ch line "*aoma6000-4-9? "; print $line

doTask 'ls -ltr'
doTask ${task1}
doShellTask './test >test.out'
doShellTask 'pwd'

# DISCONNECT
zpty -d ch


On May 15, 2008, at 1:53 PM, Jaime Vargas wrote:

> I got it working. By changing the pattern to '*assword:'. Thanks for  
> the help. -- Jaime
>
>
> On May 15, 2008, at 1:38 PM, Jaime Vargas wrote:
>
>> Still no luck. Am I missing something stupid?
>>
>> nerd% ./zpty-test.zsh
>> +./zpty-test.zsh:4> zmodload zsh/zpty
>> +./zpty-test.zsh:8> zpty scppty scp hello.world 'user@host:~/'
>> +./zpty-test.zsh:9> zpty -t scppty
>> +./zpty-test.zsh:10> zpty -r scppty line assword:
>>
>> #!/opt/csw/bin/zsh
>> set -x
>> zmodload zsh/zpty
>> die() {print -r -- $1 >&2; exit 1;}
>> zpty scppty scp hello.world user@host:~/
>> zpty -t scppty || die "fuck"
>> zpty -r scppty line "assword:" || die "no password asked"
>> zpty -w scppty "TopSecret"
>> while zpty -r scppty line;
>>    do
>>        result+="$line"$'\n'
>>    done
>> zpty -d scppty
>> print $result
>>
>> On May 15, 2008, at 1:03 PM, Stephane Chazelas wrote:
>>
>>> On Thu, May 15, 2008 at 12:00:25PM -0400, Jaime Vargas wrote:
>>>> Still doesn't work for me. Below is the modified script and the  
>>>> debug
>>>> output.
>>>>
>>>> #!/opt/csw/bin/zsh
>>>>
>>>> set -x
>>>>
>>>> zmodload zsh/zpty
>>>>
>>>> die() {print -r -- $1 >&2; exit 1;}
>>>>
>>>> zpty scppty scp hello.world jvargas@aoma6000-4-9.aoma.rhbss.com:~/
>>>> zpty -t scppty || die "fuck"
>>>> zpty -r scppty line "*:" || die "no password asked"
>>>> zpty -w scppty "3lp&tbw"
>>>> while zpty -r scppty line;
>>>>    do
>>>>        result+="$line"$'\n'
>>>>    done
>>>> zpty -d scppty
>>>> print $result
>>>>
>>>> I changed my credentials for security. Basically it now hangs  
>>>> waitng for
>>>> password and doesnt' do anything.  -- Jaime
>>>>
>>>> nerd% ./zpty-test.zsh
>>>> +./zpty-test.zsh:5> zmodload zsh/zpty
>>>> +./zpty-test.zsh:10> zpty scppty scp hello.world 'luser@host:~/'
>>>> +./zpty-test.zsh:11> zpty -t scppty
>>>> +./zpty-test.zsh:12> zpty -r scppty line '*:'
>>>
>>> Had you printed $line, you'd have seen something like
>>> "+myscript:", not "Passwd: ".
>>>
>>>
>>> [...]
>>>> +./zpty-test.zsh:14> zpty -r scppty line
>>> [...]
>>>
>>> As Peter said, if you don't provide with a pattern to look for,
>>> zpty will look for NL characters.
>>>
>>> That last zpty is probably still waiting because so far, it has
>>> only received "Password: " and is waiting for a NL character
>>> that will never come.
>>>
>>> So, in your code above, you should wait for something more
>>> specific than just ":":
>>>
>>> zpty -r scppty line "assword: " || die "no password asked"
>>>
>>> for instance.
>>>
>>> -- 
>>> Stéphane
>>
>