How do I add an init script to my RPM - linux

Question

I want to add an init script to my RPM in order to run the program from a terminal just by typing its name, there's one more thing which I am confused about and that is:-
where are these files located: pre, post, preun, postun, are they written directly into the spec file after adding a line %pre etc.
I've been through the following links however I couldn't find a solution: -
https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd
https://fedoraproject.org/wiki/Packaging:Systemd?#Filesystem_locations
Updated===============================================================
I am doing it on CentOS 6.8 and here's the spec file I created so far:-
# RPM package for xyz.
%define __spec_install_post %{nil}
%define debug_package %{nil}
%define __os_install_post %{_dbpath}/brp-compress
Summary: XYZ program.
Name: xyz
Version: 1.0
Release: 1
License: GPL+
Group: Development/Tools
SOURCE0 : %{name}-%{version}.tar.gz
URL: https://wwwDOTxyzDOTcom/
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
%description
%{summary}
%prep
%setup -q
%build
# Empty section.
%install
rm -rf %{buildroot}
mkdir -p %{buildroot}
# in builddir
cp -a * %{buildroot}
%clean
rm -rf %{buildroot}
%files
%defattr(-,root,root,-)
%config(noreplace) %{_sysconfdir}/%{name}/%{name}.conf
%{_bindir}/*
%changelog
* Mon Mar 6 2017 xyz <noemail#noemail.com> 1.0-1
- First Build
EOF
but still confused as to how do I start the program from a terminal just by typing its name.

Answer 1

You mean SYSV init files? Or systemD unit files? Different logic, but ok - at the end they are both files. In different location, but just files.
You have to do:
%{?systemd_requires}
BuildRequires: systemd
%install
cp -a path/in/your/targz/SOMESERVICE.service %{buildroot}%{_unitdir}/
%post
%systemd_post SOMESERVICE.service
%preun
%systemd_preun SOMESERVICE.service
%postun
%systemd_postun_with_restart SOMESERVICE.service
%files
%{_unitdir}/SOMESERVICE.service
For SYSV there would be little bit different paths and different snippets in %post* and %preun.