I'm trying to write a simple execute_process command for my CMakeLists.txt to check for the presence of a certain piece of text in the hosts file when the RPM is being installed, and if it isn't there, append it to the hosts file.
However, when running CMake, I get the message:
grep ||: No such file or directory
grep: echo: No such file or directory
grep: 172.16.10.43 UPSSERVER: No such file or directory
grep: >>: No such file or directory
It seems to think each piece of my executed command is a file? Here is the command in question:
set(HOSTS_UPSSERVER "172.16.10.43 UPSSERVER")
execute_process(COMMAND grep -qxF ${HOSTS_UPSSERVER} /etc/hosts || echo ${HOSTS_UPSSERVER} >> /etc/hosts)
I know the command itself works because I've tested it on its own outside the command line. Is there an error in the syntax for the way I've defined the HOSTS_UPSSERVER variable? Or in the way I'm using the execute_process command?
I haven't had much luck finding useful information on CMake, as the documentation is vague and good tutorials are practically non-existent.
Checking the /etc/hosts from within cmake makes no sense as you would only check the file on your build host. To run a script during RPM install you need to include the code in the RPM itself by providing a spec file. During generation of the RPM via cpack you can configure a spec file via CPACK_RPM_USER_BINARY_SPECFILE
Within the spec file you have to define several parameters as package name and dependencies. To run a script after installation you need to add it to the %post section:
%post
grep -qxF ${HOSTS_UPSSERVER} /etc/hosts || echo ${HOSTS_UPSSERVER} >> /etc/hosts
To use cmake variables within the spec file you need to generate it using configure_file.