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Old 01-10-2005, 02:25 PM   #1
jimwelc
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Compare installed RPM versions using Bash script


Hello All,

I am a newbie to the UNIX/Linux flavors and I am attempting to create an installer using RPM. Within my script I want to make sure that the systems has an installed vesion of RPM that is equal to or greater than a specified version. The below snippet gets the current version of RPM, but I am not sure how to parse the values to check for correctness.


#===========BEGIN Code snippet ==========

#============================================
f_Check_RPM_Version() # Checks the installed version of RPM
#============================================
{
ROOT_BIN_RPM="/bin/rpm"
USR_BIN_RPM="/usr/bin/rpm"
USR_LOCAL_BIN_RPM="/usr/local/bin/rpm"

#Checks to see if the RPM application
#is installed on the system
if [[ -e $ROOT_BIN_RPM || -e $USR_BIN_RPM|| -e $USR_LOCAL_BIN_RPM ]]; then
RPM_VERSION=`rpm -q rpm`

#****NEED to compare versions here *****
STR_BASE_ACCEPTABLE_VER="rpm-4.2-0.69"
#****NEED to compare versions here *****

printf "$STR_RPM_CORRECT_VERSION $RPM_VERSION"
else
printf "$STR_RPM_INCORRECT_VERSION"

exit 1
fi

} # end f_Check_RPM_Version()


#===========END Code snippet ==========



Any help you can proved would be greatly appreciated.

Best Regards,
-Jim
 
Old 01-10-2005, 03:24 PM   #2
bulliver
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Just clarification: You want to check if $RPM_VERSION is greater or equal to rpm-4.2-0.69?? Is that right?
 
Old 01-10-2005, 03:30 PM   #3
jimwelc
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RE: Compare installed RPM versions using Bash script

Correct. I am looking to check if $RPM_VERSION is greater or equal to rpm_4.2-0.69.


Thanks
 
Old 01-10-2005, 03:49 PM   #4
bulliver
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Note: this is untested...

Code:
#****NEED to compare versions here *****

STR_BASE_ACCEPTABLE_VER="rpm-4.2-0.69"

if  [[ "$RPM_VERSION" < "$STR_BASE_ACCEPTABLE_VER" ]]; then
    echo "$RPM_VERSION is too low..."
else
    echo "$RPM_VERSION is fine"
fi

#****NEED to compare versions here *****
Have a look at http://www.tldp.org/LDP/abs/html/comparison-ops.html for comparison operators in bash...

Last edited by bulliver; 01-10-2005 at 03:51 PM.
 
Old 01-10-2005, 04:41 PM   #5
jimwelc
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Talking

THANKS for your help bulliver. Your code snippet is just what I was looking for. In my attempt I was fudging up the '['. I will be sure to check out that link.

Best Regards,
-Jim
 
Old 01-28-2005, 11:31 AM   #6
QICBoy
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This is a string comparison, so it will fail on rpm_4.12-0.69. Isn't there a more reliable method, like using an rpm command?
 
Old 01-28-2005, 11:40 AM   #7
jimwelc
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Using your example....any built RPM has the following format of:

"[Product Name] - [Distribution Type] - [Major Version] . [Minor Version]. [Maintenance-Revision Version] - [Build Version].[Architecture]"

If this format is not followed then all bets are off. In my case what I ended up doing was stripping the [Major Version] . [Minor Version]. [Maintenance-Revision Version] - [Build Version] out of the string and then do a numerical comparison. Messy but I have not found any quick an easy way around this issue. If you come across anything please feel free to post it.

-Jim
 
  


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