The situation is a data center with around 800 servers.
Each server has installed one of these unix-like OS: rhel, sunos, aix, hp-ux.
And we have to make scripts general enough to being able to be executed over all these servers.
Furthermore, sometimes the scripts will be executed as a normal user and sometimes they will be executed as root.
The problem is:
sometimes the path for the binaries used into the script are in one place, and sometimes they are in another place. So the variety of different places the binaries used into the script are placed is big.
So, to make the scripts "bomb-proof" we're using this strategy:
In general, we're assigning to the PATH variable the content it had ($PATH) plus the content of all the PATH variables of the user root of each type of OS plus some "usually known places for rare binaries temporary used like inqraid in /var/tmp or in /home/ouruser" on some servers.
After doing this PATH assignment, we're checking for each command used in the script if it is in the path, checking it with the
Code:
which
command. If one of the binaries used in the script is not in our "MEGAPATH" we exit with a message saying the binary X needed to executed the script is not in the PATH.
My question is:
Is this the better way to ensure the different binaries we should use in a script are in the PATH before continuing with the execution of the script? I'm open to different suggestions. Thank you!
Assuming the paths are based on the system and all systems have the same shell, you could find out the system at the start, then set the PATH accordingly.
Assuming ksh93 on Sun (code is untested but you get the idea):
Code:
#!/usr/dt/bin/dtksh
## The above shell should be present on all machines. In this example,
## ksh93.
# Define constants for system-specific search PATHs
typeset -r SUNOSPATH=<sun specific path>
typeset -r RHELOSPATH=<RHEL specific path>
typeset -r AIXOSPATH=<AIX specific path>
# Define constants for sytem/root-specific search paths.
typeset -r SUNROOTPATH=<SUN root specific path>
typeset -r RHELROOTPATH=<RHEL root specific path>
typeset -r AIXROOTPATH=<AIX root specific path>
# define variables.
newpath=""
userpath=""
# Find out what system I am on.
typeset -r SYSTEM=$(uname)
# Find out what user I am running as.
typeset -r USER=$(logname)
# set newpath to the system-specific one.
case $SYSTEM in
'SunOS') newpath=${SUNOSPATH}
;;
'RHEL') newpath=${RHELOSPATH}
;;
'AIX') newpath=${AIXOSPATH}
;;
*) # Always expect the unexpected!
print "$0: Unknown system [$SYSTEM] encountered"
exit 1
;;
esac
# if we are root, add that path too.
if [[ $USER == "root" ]]; then
case $SYSTEM in
'SunOS') newpath=${newpath}:${SUNROOTPATH}
;;
'RHEL') newpath=${newpath}:${RHELROOTPATH}
;;
'AIX') newpath=${newpath}:${AIXROOTPATH}
;;
esac
fi
# Add the system/user-specific path to the current environment's PATH
export PATH="${PATH}:${newpath}"
# test
print "System: $SYSTEM"
print "User: $USER"
print "Path: $PATH"
exit 0
Pros: Generic.
If paths change, you only have to set them in one place, at the top of the script.
Caveats: if the command you need to run exists in multiple locations, make sure you are running the right one. This would be controlled by the order in which you build the PATH.
I got a little carried away, but it was an interesting lunchtime distraction. :-)
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