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chown remotely via ssh / invalid group


 
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# 1  
Old 09-01-2009
chown remotely via ssh / invalid group

Hi,

i have a problem with a shell script. I need to change the owner and group of a file on a remote machine.

I tried to use ssh but have some problems.

The code:
Code:
group=`ssh -t -t $1 -p 3344 "stat -c %G $cpath/FILE"`

echo " $2:$group "
echo $1
echo $cpath

ssh $1 -p 3344 "chown $2:$group $cpath/FILE

The Output if started with ./script.sh 192.168.0.99 scott
Code:
 scott:users
192.168.0.99
/backup/scott/data

chown: Ôscott:users\rÔ: ung├╝ltige Gruppe

Note: "ung├╝ltige Gruppe" = invalid group (there is a problem with special character " Ř ")

Output if startet with sh -x script.sh 192.168.0.99 scott
Code:
++ ssh -t -t 192.168.0.99 -p 3344 'stat -c %G /backup/scott/data/FILE'
Connection to 192.168.0.99 closed.
+ group=$'users\r'

 'echo ' scott:users
 scott:users
+ echo 192.168.0.99
192.168.0.99
+ echo /backup/scott/data
/backup/scott/data

++ ssh 192.168.0.99 -p 3344 'chown scott /backup/scott/data/FILE'
 /backup/scott/data/FILE'wn scott:users
chown: Ôscott:users\rÔ: ung├╝ltige Gruppe

If i do " chown scott:users /backup/scott/data/FILE " there is no problem.

I think the problem is in the variable $group cuz it is containing this " \r " any hint where this comes from or how to get rid of it ?

Thank you
Greetings LiniÚn

edit:
Additional Info:
OpenSSH_3.9p1, OpenSSL 0.9.7e 25 Oct 2004
Linux version 2.6.11.4-21.15-default (geeko@buildhost) (gcc version 3.3.5 20050117 (prerelease) (SUSE Linux)) #1 Tue Nov 28 13:39:58 UTC 2006

Last edited by Linien; 09-01-2009 at 09:47 AM..
# 2  
Old 09-01-2009
Hi,

Just a though that crossed my mind: are you using the same charset on both systems?
# 3  
Old 09-01-2009
Try writing the result of this part of your script to a file (from inside the script - not from command line):
Code:
group=`ssh -t -t $1 -p 3344 "stat -c %G $cpath/FILE"`

Open the file with vi, and turn on the display of invisible characters. This will show those funny windows characters (like ^M at the end of the line) - maybe there's a special character at the front.
Code:
:set list

Running this command does not change the file - you can easily toggle this feature off with:
Code:
:set nolist

# 4  
Old 09-02-2009
Thanks for your time.

Ok i changed the code to following:

Code:
ssh -t -t $1 -p 3344 "stat -c %G $cpath/FILE" > group.log

group=`cat group.log`

echo $group

ssh $1 -p 3344 "chown $2:$group $cpath/FILE"

When i open the group.log file with vi and :set list it looks like this:

Code:
users$
~
~
~
~
:set list                                     1,5           All

If i run the script with sh -x
Code:
+ ssh -t -t 192.168.0.99 -p 3344 'stat -c %G /backup/scott/data/FILE'
Connection to 85.214.147.44 closed.
++ cat group.log
+ group=$'users\r'
+ echo $'users\r'
users

 /backup/scott/data/FILE'wn scott:users
chown: Ôscott:users\rÔ: ung├╝ltige Gruppe

@ripat
Which charset i have to check ? Is there an extra charset for ssh ?

Since the server whos executing the script is an old SuSE 9.3 and the target machines are Debian (Etch) and RHEL and some other distributions... i guess its possible that the charset is not matching.

Greetings LiniÚn
# 5  
Old 09-02-2009
Hmmm....

Your command is:
Code:
group=`ssh -t -t $1 -p 3344 "stat -c %G $cpath/FILE"`

Why are you using the -t -t option for ssh? Do you need the pseudo tty sessions?

Here's what I've tried. I created a script called sshtest.sh.
Code:
#!/bin/sh
group=`ssh $1 stat -c %G $2/FILE`
echo $group

I run it by passing two arguments - $1 and $2. $1 is the server to connect to and $2 is the path to the file.
Code:
./sshtest.sh myhost /var/tmp/testing

And the result is:
Code:
slocate

This is the group that owns the file.

See if you can accurately report on the current group for your files, then see if you can change the group ownership after that.
# 6  
Old 09-03-2009
MySQL

Quote:
Here's what I've tried. I created a script called sshtest.sh.
Code:
#!/bin/sh
group=`ssh $1 stat -c %G $2/FILE`
echo $group

I tried this with my server and it works.
Code:
sh -x sshtest.sh 192.168.0.99 /backup/scott/data
++ ssh 192.168.0.99 -p 3344 stat -c %G /backup/scott/data/FILE
+ group=users
+ echo users
users

I tried to implement this into my script but at first it wont work as expected.

But you were completely right. My problem was the pseudo tty (I used it just cause most of my other commands needed it for edit some files and execute some other shell scripts etc.)

So i changed my code from

Code:
group=`ssh -t -t $1 -p 3344 "stat -c %G $cpath/FILE"`

to

Code:
group=`ssh $1 -p 3344 stat -c %G $cpath/FILE`

And its working fine now.

Thanks for your help
LiniÚn

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