Build a simple RPM that packages a single file

# Tested on RHEL 6 & 7

# The ‘rpmbuild‘ command is used to build a binary RPM from source code, as configured
# with a .spec file.

# Install the necessary packages: rpm-build and rpmdevtools:

yum install rpm-build rpmdevtools

# If possible,  avoid creating packages as ‘root’ as this is quite dangerous because we
# could delete or overwrite OS existing files.

# Set up the folder structure. Placed on the HOME folder of a user without admin privileges, # run following command:

user@myhost:/home/user#> rpmdev-setuptree

# This will create rpmbuild structure where we will work on building packages:

   rpmbuild/SRPMS
rpmbuild/SPECS
rpmbuild/SOURCES
rpmbuild/RPMS
rpmbuild/BUILD

# This can be alternatively done by running these commands:

user@myhost:/home/user#> mkdir -p ~/rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}

user@myhost:/home/user#> echo ‘%_topdir %(echo $HOME)/rpmbuild’ > ~/.rpmmacros

# Under rpmbuild/SOURCES create a folder with source file(s). Do not forget to provide
# a revision number. For instance, our source file will be a script named ‘HelloWorld.sh’

user@myhost:/home/user/rpmbuild/SOURCES#> cd ~/rpmbuild/SOURCES

user@myhost:/home/user/rpmbuild/SOURCES#> mkdir HelloWorld-1.0

user@myhost:/home/user/rpmbuild/SOURCES#> vi HelloWorld-1.0/HelloWorld.sh
echo “Hello world!”

user@myhost:/home/user/rpmbuild/SOURCES#> chmod 755 HelloWorld-1.0/HelloWorld.sh

user@myhost:/home/user/rpmbuild/SOURCES#> touch HelloWorld-1.0/configure

user@myhost:/home/user/rpmbuild/SOURCES#> chmod 755 HelloWorld-1.0/configure

user@myhost:/home/user/rpmbuild/SOURCES#> tar czvf HelloWorld-1.0.tar.gz HelloWorld-1.0

# Create the spec file: This is the hard part – configuring the RPM on what to build,
# install, and configure. A sample spec file can be created by running:

user@myhost:/home/user/rpmbuild/SOURCES#> cd

user@myhost:/home/user#> rpmdev-newspec rpmbuild/SPECS/HelloWorld-1.0.spec
Skeleton specfile (minimal) has been created to “rpmbuild/SPECS/HelloWorld-1.0.spec”.

# But there is still a lot to add and remove to make this work. This is a spec file
# created using the sample file.

# Edit spec file and add/modify necessary parameters (my setup in bold letters)

user@myhost:/home/user#> vi ~/rpmbuild/SPECS/HelloWorld-1.0.spec

Name: HelloWorld

Version: 1.0                       <— Version must be the same as the name of the
folder containing the package file(s)

Release: 1%{?dist}                 <— Release number, added to package’s name
Summary: Hello World Script
Group: Miscellaneous               <— For general purposes use ‘Miscellaneous’
License: License text
# URL:

Source0: HelloWorld-1.0.tar.gz     <— Pay attention to the name of tar file
BuildArch: noarch                  <— If nothing specified, current architecture
is used [ i386 | x86_64 | noarch ]

BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)

# BuildRequires:                   <— Required packages to build this one

# Requires:                        <— Required packages for installing this one

%description
This is a text describing what the Package is meant for

%prep

%setup -q

%build
# %configure                       <— We have nothing to configure or compile
# make %{?_smp_mflags}                   so we comment these two lines out

%install

rm -rf $RPM_BUILD_ROOT

# make install DESTDIR=$RPM_BUILD_ROOT    <— We have nothing to compile

install -d -m 0755 $RPM_BUILD_ROOT/opt/HelloWorld
install -m 0755 HelloWorld.sh $RPM_BUILD_ROOT/opt/HelloWorld/HelloWorld.sh

^ These two directives indicate where folders and files will be
created/installed and their effective rights

%clean

rm -rf $RPM_BUILD_ROOT

%files

%defattr(-,root,root,-)

# %doc

/opt/HelloWorld/HelloWorld.sh       <— We confirm the file(s) to install

%changelog
# Once the spec file is complete, build the package with:

user@myhost:/home/user#> rpmbuild -ba rpmbuild/SPECS/HelloWorld-1.0.spec

# Assuming no errors occurred, new package is under the RPMS folder ready to be installed.

user@myhost:/home/user#> cd ~/rpmbuild/RPMS/noarch
user@myhost:/home/user/rpmbuild/RPMS/noarch#> ll
total 4
-rw-rw-r– 1 user user 2104 Sep 26 16:53 HelloWorld-1.0-1.el6.noarch.rpm

user@myhost:/home/user/rpmbuild/RPMS/noarch#> rpm -qpl HelloWorld-1.0-1.el6.noarch.rpm
/opt/HelloWorld/HelloWorld.sh

# Let’s install our new package (as ‘root’)

root@myhost:/root#> rpm -ihv /home/user/rpmbuild/RPMS/noarch/HelloWorld-1.0-1.el6.noarch.rpm
Preparing…                ########################################### [100%]
1:HelloWorld             ########################################### [100%]

root@myhost:/root#> rpm -qa HelloWorld
HelloWorld-1.0-1.el6.noarch

root@myhost:/root#> /opt/HelloWorld/HelloWorld.sh
Hello world!

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