#!/bin/bash

# This library holds utilities for building RPMs from Origin.

# os::build::rpm::generate_nevra_vars determines the NEVRA of the RPMs
# that would be built from the current git state.
#
# Globals:
#  - OS_GIT_VERSION
# Arguments:
#  - None
# Exports:
#  - OS_RPM_NAME
#  - OS_RPM_VERSION
#  - OS_RPM_RELEASE
#  - OS_RPM_ARCHITECTURE
function os::build::rpm::get_nvra_vars() {
	# the package name can be overwritten but is normally 'origin'
	OS_RPM_NAME="${OS_RPM_NAME:-"origin"}"
	OS_RPM_ARCHITECTURE="$(uname -i)"

	# we can extract the pacakge version from the build version
	os::build::version::get_vars
	if [[ "${OS_GIT_VERSION}" =~ ^v([0-9](\.[0-9]+)*)(.*) ]]; then
		OS_RPM_VERSION="${BASH_REMATCH[1]}"
		metadata="${BASH_REMATCH[3]}"
	else
		os::log::fatal "Malformed \$OS_GIT_VERSION: ${OS_GIT_VERSION}"
	fi

	# we can generate the package release from the git version metadata
	# OS_GIT_VERSION will always have metadata, but either contain
	# pre-release information _and_ build metadata, or only the latter.
	# Build metadata may or may not contain the number of commits past
	# the last tag. If no commit number exists, we are on a tag and use 0.
	# ex.
	#    -alpha.0+shasums-123-dirty
	#    -alpha.0+shasums-123
	#    -alpha.0+shasums-dirty
	#    -alpha.0+shasums
	#    +shasums-123-dirty
	#    +shasums-123
	#    +shasums-dirty
	#    +shasums
	if [[ "${metadata:0:1}" == "+" ]]; then
		# we only have build metadata, but need to massage it so
		# we can generate a valid RPM release from it
		if [[ "${metadata}" =~ ^\+([a-z0-9]{7,40})(-([0-9]+))?(-dirty)?$ ]]; then
			build_sha="${BASH_REMATCH[1]}"
			build_num="${BASH_REMATCH[3]:-0}"
		else
			os::log::fatal "Malformed git version metadata: ${metadata}"
		fi
		OS_RPM_RELEASE="1.${build_num}.${build_sha}"
	elif [[ "${metadata:0:1}" == "-" ]]; then
		# we have both build metadata and pre-release info
		if [[ "${metadata}" =~ ^-([^\+]+)\+([a-z0-9]{7,40})(-([0-9]+))?(-dirty)?$ ]]; then
			pre_release="${BASH_REMATCH[1]}"
			build_sha="${BASH_REMATCH[2]}"
			build_num="${BASH_REMATCH[4]:-0}"
		else
			os::log::fatal "Malformed git version metadata: ${metadata}"
		fi
		OS_RPM_RELEASE="0.${pre_release}.${build_num}.${build_sha}"
	else
		os::log::fatal "Malformed git version metadata: ${metadata}"
	fi

	export OS_RPM_NAME OS_RPM_VERSION OS_RPM_RELEASE OS_RPM_ARCHITECTURE
}


# os::build::rpm::format_nvra formats the rpm NVRA vars generated by
# os::build::rpm::get_nvra_vars and will generate them if necessary
#
# Globals:
#  - OS_RPM_NAME
#  - OS_RPM_VERSION
#  - OS_RPM_RELEASE
#  - OS_RPM_ARCHITECTURE
# Arguments:
#  None
# Returns:
#  None
function os::build::rpm::format_nvra() {
	if [[ -z "${OS_RPM_NAME:-}" || -z "${OS_RPM_VERSION:-}" || -z "${OS_RPM_RELEASE:-}" ]]; then
		os::build::rpm::get_nvra_vars
	fi

	echo "${OS_RPM_NAME}-${OS_RPM_VERSION}-${OS_RPM_RELEASE}.${OS_RPM_ARCHITECTURE}"
}