Bash script - ENV Variable context problem using su
Hello
I have found some piece of code to verify and then run shell script with root permission from normal user.
see : http://blog.mecworks.com/articles/20...script-as-root
I have wrote two scripts using this tips.
- one to copy file from server to local computer ( files_copy_from_server.sh )
and this program is started by using another script ( files_copy_from_server_launcher.sh)
- one to copy file to server from local computer ( files_copy_to_server.sh )
and this program is started by using another script ( files_copy_to_server_launcher.sh)
The first one run perfectly.
Code:
user@asus:~> /home/user/bin/files_copy_from_server_launcher
CMD : /home/user/bin/files_copy_from_server
PARAM : /root/bin/mysql* /home/user/
Please enter root's password.
Password:
MAIN - there are 2 parametres
MAIN - PARAM0 : /home/juser/bin/files_copy_from_server
MAIN - PARAM1 : /root/bin/mysql*
MAIN - PARAM2 : /home/user/
COMMAND : pscp -v -2 -P 12345 -i /root/.ssh/my-key.ppk -l root root@192.168.123.123:/root/bin/mysql* /home/user/
Server version: SSH-2.0-OpenSSH_6.1
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
Doing Diffie-Hellman key exchange with hash SHA-256
Host key fingerprint is:
ssh-rsa 2048 db:dc:dd:de:df:1a:1b:1c:1d:1e:c0:c1:c2:c3:c4:c5
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA1 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA1 server->client MAC algorithm
Reading private key file "/root/.ssh/my-key.ppk"
Pageant is running. Requesting keys.
Pageant has 0 SSH-2 keys
Configured key file not in Pageant
Using username "root".
Offered public key
Offer of public key accepted
Authenticating with public key "imported-openssh-key"
Sent public key signature
Access granted
Opened channel for session
Started a shell/command
Using SFTP
Connected to 192.168.123.123
mysql_04_make-mysql-from- | 0 kB | 0.9 kB/s | ETA: 00:00:00 | 100%
mysql_install_db_mysql_si | 2 kB | 2.5 kB/s | ETA: 00:00:00 | 100%
mysql_remove_suse_mysql_a | 1 kB | 1.4 kB/s | ETA: 00:00:00 | 100%
mysql_create_users_mysql | 2 kB | 2.6 kB/s | ETA: 00:00:00 | 100%
mysql_create_dir_mysql | 2 kB | 2.3 kB/s | ETA: 00:00:00 | 100%
mysql_remove_oracle_mysql | 1 kB | 1.8 kB/s | ETA: 00:00:00 | 100%
mysql_01_install_mysql_ed | 1 kB | 1.5 kB/s | ETA: 00:00:00 | 100%
mysql_remove_oracle_mysql | 1 kB | 1.4 kB/s | ETA: 00:00:00 | 100%
mysql_install_mysql_softw | 2 kB | 2.9 kB/s | ETA: 00:00:00 | 100%
mysql_create_mysql_config | 4 kB | 4.9 kB/s | ETA: 00:00:00 | 100%
mysql_full_install_mysql | 3 kB | 3.2 kB/s | ETA: 00:00:00 | 100%
mysql_03_my_function | 4 kB | 4.7 kB/s | ETA: 00:00:00 | 100%
mysql_remove_mariadb___ | 1 kB | 1.6 kB/s | ETA: 00:00:00 | 100%
mysql_create_mysql_config | 3 kB | 3.5 kB/s | ETA: 00:00:00 | 100%
mysql_install_db_mysql_mu | 2 kB | 2.2 kB/s | ETA: 00:00:00 | 100%
mysql_remove_suse_mysql__ | 1 kB | 1.6 kB/s | ETA: 00:00:00 | 100%
mysql_remove_mariadb_and_ | 1 kB | 1.4 kB/s | ETA: 00:00:00 | 100%
mysql_02_install_oracle_m | 6 kB | 6.9 kB/s | ETA: 00:00:00 | 100%
Sent EOF message
Server sent command exit status 0
Disconnected: All channels closed
user@asus:~>
The second one failed because variables are not set correctly :
Code:
user@asus:~> /home/user/bin/files_copy_to_server_launcher
CMD : /home/user/bin/files_copy_to_server
PARAM : /home/user/bin/files_copy* /root/bin/
Please enter root's password.
Password:
MAIN - il y a 6 parametres
MAIN - PARAM0 : /home/user/bin/files_copy_to_server - correct
MAIN - PARAM1 : /home/user/bin/files_copy_from_server - should be "/home/user/bin/files_copy*"
MAIN - PARAM2 : /home/user/bin/files_copy_from_server_launcher - should be "/root/bin/"
MAIN - PARAM3 : /home/user/bin/files_copy_to_server - should not exists
MAIN - PARAM4 : /home/user/bin/files_copy_to_server.1 - should not exists
MAIN - PARAM5 : /home/user/bin/files_copy_to_server_launcher - should not exists
USAGE : /home/user/bin/files_copy_to_server local_source_file server_file_dest
user@asus:~>
The exec su line is expanding your arguments. You could define CMDLN_ARGS like this:
Code:
CMDLN_ARGS="\"$@\"" # Command line arguments for this script
Does not help.
I have made some change. As the two executing jobs programs are very similar, I have made one program for the two task. So I am passing 3 arguments as I have added the copy direction ( "from" or "to" ).
So I am using now an unique program. And I get the same problem.
here is the command in the first launcher files_copy_from_server_launcher :
Reading exec parameter
$ 1 : from /root/bin/mysql* /home/user/
this is given by "echo $1"
$ 1 : from /root/bin/mysql* /home/user/
this is given by "echo "$1
$ { 1 } : from /root/bin/mysql* /home/user/
this is given by "echo ${1}"
$ { 1 } : from /root/bin/mysql* /home/user/
this is given by "echo "{$1}
MAIN - il y a 3 parametres
MAIN - PARAM0 : /home/user/bin/files_copy_server
MAIN - PARAM1 : from
MAIN - PARAM2 : /root/bin/mysql*
MAIN - PARAM3 : /home/user/
The second launcher run badly.;
Here part of screen logs; Note the important info for the following are in bold :
MAIN - il y a 24 parametres this is bad
MAIN - PARAM0 : /home/user/bin/files_copy_server
MAIN - PARAM1 : to
MAIN - PARAM2 : /home/user/bin/files_copy_from_server this is bad
MAIN - PARAM3 : /home/user/bin/files_copy_from_server.1 this is bad
the program extract parameter in this loop :
Code:
for PARAM in $1 ; do
case $MY_COUNT in
0)
DIRECTION=$PARAM
;;
1)
SOURCE=$PARAM
;;
2)
DESTINATION=$PARAM
;;
esac
((MY_COUNT += 1 ))
done
As $1 is badly interpreted the program miss-function.
I suspect that /root/bin/mysql* currently doesn't match any files so the shell is leaving it unexpanded whereas /home/user/bin/files_copy* does match files.
[SOLVED]Bash script - ENV Variable context problem using su Edit Post
Quote:
Originally Posted by Chubler_XL
I suspect that /root/bin/mysql* currently doesn't match any files so the shell is leaving it unexpanded whereas /home/user/bin/files_copy* does match files.
Yes that's the reason.
Got it to work with the use of : set -f before the expansion of CMDLN_ARGS
Code:
set -f
for PARAM in $1 ;
do case $MY_COUNT in
0) DIRECTION=$PARAM ;;
1) SOURCE=$PARAM ;;
2) DESTINATION=$PARAM ;;
esac ((MY_COUNT += 1 )) done
set +f
Last edited by jcdole; 11-11-2013 at 07:21 PM..
Reason: solved
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