LinuxQuestions.org - Need help with building an RPM and performing a check in the build phase

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- - Need help with building an RPM and performing a check in the build phase (https://www.linuxquestions.org/questions/red-hat-31/need-help-with-building-an-rpm-and-performing-a-check-in-the-build-phase-689628/)

Need help with building an RPM and performing a check in the build phase

I'm building an RPM, and can successfully do so.
I'd like to add a check in my .spec file to see if a uid is already in use and exit the whole process if it is already in use. I tried this in %prep:

Code:

if [ -z `/bin/cat /etc/passwd | /bin/grep 89` ]; then

        /bin/echo "User id 89 is already is use. Cannot continue!"

        exit 1

fi

As well as this during %build :

Code:

if [ -z `/bin/grep 89 /etc/passwd` ]; then

        /bin/echo "User id 89 is already is use. Cannot continue!"

        exit 1

fi

And it keeps going through even though it's already in use (I created a user with uid 89 to test).
Anyone have any suggestions?
Thanks in advance.

The %prep phase only concerns building the package so this does not make a lot of sense to me: after all you can not control where the package will be built. If you still want to kill it you could try something like 'getent passwd 89 >/dev/null 2>&1||pkill -9 -f "rpmbuild -"' thought that doesn't leave the process any time to clean up the build dir or whatever else.