Rootconf 2014

To introduce Mock to the audience.

• What is Mock?

• How does it help?

• When and why to use it?

• How to get going with a full fledged build in different RH versions using few lines of command?

• What and why reproducible build?

• Who uses Mock?!

Outline

Mock is used for setting up a sanitised build environment. It caches and reuses downloaded OS environment to recreate a new sane environment. Using mock, we can setup an altogether different version environment like Centos5 on a Centos6 machine. This is done using chroot and hence no overhead of virtualization is involved.

Mock helps in setting up a reproducible build environment.

=Why reproducible build?=

From https://wiki.debian.org/ReproducibleBuilds

• Allow independent verifications that a binary matches what the source intended to produce.

• Help Multi-Arch: same packages co-installation (as they need every matching file to be byte identical).

• Be able to generate debug symbols for packages which do not have a “debug package”.

• Ensure packages can be built from source.

Requirements

Access to a RH base environment (Redhat, Fedora, Centos or similar) with mock installed.

A source rpm of a package to be build.

Speaker bio

I work as DevOps TechLead for Aerospike, a distributed NoSQL database.

http://about.me/anshuprateek

Links

• https://fedoraproject.org/wiki/Projects/Mock
• http://fedoraproject.org/wiki/Using_Mock_to_test_package_builds
• https://securityblog.redhat.com/2013/09/18/reproducible-builds-for-fedora/
• https://wiki.debian.org/ReproducibleBuilds