Hi,
I am trying to create an RPM package where the post script is able to figure out if the package get relocated. I need that because the RPM is installing some *.so links into /usr/lib and they need to point to the right location.
Thanks

If %post has access to any args given to rpm (dunno), maybe you could parse $@ for the arg thats shift 1 at --relocate?

I found similar questions in several forums (none with answers). So I'm resurrecting this thread with the answer.

Problem:
The default prefix is %{_prefix} but the %post section of the spec file can only use it when the rpm is being built, we need to know the prefix when the rpm is being installed.

Solution:
Use the environment variable $RPM_INSTALL_PREFIX to determine where the package prefix is at install time.

e.g.
Prefix: /usr

%post
#Soft link example
ln -s %{_prefix}/lib/mylib.so $RPM_INSTALL_PREFIX/lib/mylib.so

#Echo example
if [ $RPM_INSTALL_PREFIX == %{_prefix} ]
then
echo "package installed in default location: %{_prefix}"
else
echo "package installed in user-defined location: $RPM_INSTALL_PREFIX"
fi

In the above example %{_prefix} is changed to the default prefix "/usr" when the script is written and the environment variable $RPM_INSTALL_PREFIX is replaced with the one given on the commandline at install time. i.e. rpm -i --prefix /usr/local package.rpm