build: Add conditional builds for rpm build customization and related build script refactoring

[sjd78]

Motivation

When working with a community member on the new Georgian translations, I created a custom copr repo to distribute translation updates as rpms. This allowed the translator to use my copr repo and just dnf upgrade to test his translations. The problem was that I could not enable a full build on a snapshot releases. Instead of just pointing my copr repo to my branch with updated translation files, I also needed to patch the spec file.

With the conditional builds, I can enable a full build (with not unit tests) on my copr repo and point the build directly to my translation update PR.

Summary

Instead of sed swapping in a 0 or 1 for a %define variable in the spec.in file, or running rpmbuild with a --define, use conditional builds. See rpm conditional build docs for how they work.

With a conditional build, source rpms retain the ability to build with different options depending on how rpmbuild is called. This allows a minimal (en_US, Firefox, Safari) or full (all locales, all browsers) build from srpm to be selected at build time using --with or --without build options.

Since at least copr builds chroots directly from a srpm, conditional builds can be used to change build options. With this change, a "full build" can be forced simply by configuring the target chroot setting "without" to include "ovirt_build_full".

Details

• A ovirt_build_full is the is the default

• Refactored build-srpm.sh and build-rpm.sh:

  • each script has only the envvars setup that the work needs to run
  • use getopts to parse options so they don't positionally clash
  • add a snapshot build release suffix if the Makefile var MILESTONE is not empty

• For GitHub CI, a minimal build with unit tests is used ("SNAPSHOT" in the pom.xml version string triggers a MILESTONE=master and that causes ovirt_build_minimal to be the default option)

• For copr builds, use build-srpm.sh -c to keep CI and copr srpm builds in the same place

• bump_release.sh no longer needs to patch .copr/Makefile since the build-srpm.sh script can detect snapshot vs release builds by looking at the MILESTONE Makefile var

• Removed the file milestone-config.sh since it is not used anywhere in the codebase

Example

My translation testing copr repo: https://copr.fedorainfracloud.org/coprs/sdickers/enUS_kaGE/

ovirt-engine package referencing my PR branch:

Settings for the centos8-stream chroot:

[sjd78]

Similar PRs:

• build: add conditional build for offline/online builds ovirt-web-ui#1616
• build: add conditional build for offline/online builds ovirt-engine-ui-extensions#58