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os_release_info.cmake
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os_release_info.cmake
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#
# Copyright (C) 2018 Intel Corporation
#
# SPDX-License-Identifier: MIT
#
if(NOT DEFINED _os_release_info)
set(_os_release_info TRUE)
# os_release_info.cmake - Function to dump OS name and version
# This file has no dependencies on other files (e.g., functions or definitions)
# of the local cmake environment.
# Set cmake policies for at least this level:
cmake_minimum_required(VERSION 2.8.12)
# Function get_os_release_info - Determine and return OS name and version
#
# Args:
# 1. the name of a variable to receive os_name
# 2. the name of a variable to receive os_version
#
# Return values: (Quotation marks are always stripped).
# Upon failure, return values are null strings.
#
# Examples:
# os_name os_version
# -------------- -------
# clear-linux-os 21180 (Changes twice daily)
# ubuntu 12.04 16.04 17.10 18.04
# fedora 27
# centos 6.9 7.4.1708
#
# Potential sources are tried (in order of preference) until a
# suitable one is found.
# Implementation documentation:
#
# The potential sources, in order, are as follows.
# - /etc/centos-release
# Centos 7 also has /etc/os-release. File /etc/os-release is less
# precise about the Centos version (e.g., "7" instead of "7.4.1708").
# For that reason, this file is checked first.
# Examples:
# CentOS release 6.9 (Final)
# CentOS Linux release 7.4.1708 (Core)
# - /usr/lib/os-release
# Present for Clear Linux, modern Fedora, and Ubuntu since some time
# between 14.04 and 16.04. The ID and VERSION_ID values are used.
# Examples:
# ID=clear-linux-os VERSION_ID=21180
# ID=fedora VERSION_ID=27
# ID=ubuntu VERSION_ID="14.04"
# ID=ubuntu VERSION_ID="16.04"
# ID="ubuntu" VERSION_ID="17.10"
# - /etc/os-release - Same form as (sometimes a link to) /usr/lib/os-release
# ID="Ubuntu" VERSION_ID="12.04"
# ID="Ubuntu" VERSION_ID="14.04"
# with a symbolic link: /etc/os-release -> ../usr/lib/os-release
# ID="CentOS Linux" VERSION_ID="7" Also: ID_LIKE="rhel fedora"
# - /etc/lsb-release
# For Centos, not too meaningful.
# Other "OS"s are more reasonable:
# DISTRIB_ID=Ubuntu DISTRIB_RELEASE=12.04
# DISTRIB_ID=Ubuntu DISTRIB_RELEASE=14.04
# DISTRIB_ID=Ubuntu DISTRIB_RELEASE=17.10
function(get_os_release_info _vn_id _vn_version_id)
set(_var_id "")
set(_var_version_id "")
if("${_var_id}" STREQUAL "")
set(file_path "/etc/centos-release")
if(EXISTS "${file_path}")
# Example: CentOS release 6.9 (Final)
file(STRINGS "${file_path}" file_list LIMIT_COUNT 1)
list(GET file_list 0 file_line)
# Remove all parenthesized items.
string(REGEX REPLACE "\\([^)]+\\)" "" file_line "${file_line}")
# Extract start and end, discard optional "version" or "release"
string(REGEX MATCH "^([A-Za-z0-9_]+)( +(version|release))? +(.*)$" _dummy "${file_line}")
# 1 2 3 4
set(_var_id "${CMAKE_MATCH_1}")
set(_var_version_id "${CMAKE_MATCH_4}")
endif()
endif()
if("${_var_id}" STREQUAL "")
if(EXISTS "/usr/lib/os-release")
set(file_path "/usr/lib/os-release")
elseif(EXISTS "/etc/os-release")
set(file_path "/etc/os-release")
else()
set(file_path "")
endif()
if(NOT "${file_path}" STREQUAL "")
file(STRINGS "${file_path}" data_list REGEX "^(ID|VERSION_ID)=")
# Look for lines like "ID="..." and VERSION_ID="..."
foreach(_var ${data_list})
if("${_var}" MATCHES "^(ID)=(.*)$")
set(_var_id "${CMAKE_MATCH_2}")
elseif("${_var}" MATCHES "^(VERSION_ID)=(.*)$")
set(_var_version_id "${CMAKE_MATCH_2}")
endif()
endforeach()
endif()
endif()
if("${_var_id}" STREQUAL "")
set(file_path "/etc/lsb-release")
if(EXISTS "${file_path}")
file(STRINGS "${file_path}" data_list REGEX "^(DISTRIB_ID|DISTRIB_RELEASE)=")
# Look for lines like "DISTRIB_ID="..." and DISTRIB_RELEASE="..."
foreach(_var ${data_list})
if("${_var}" MATCHES "^(DISTRIB_ID)=(.*)$")
set(_var_id "${CMAKE_MATCH_2}")
elseif("${_var}" MATCHES "^(DISTRIB_RELEASE)=(.*)$")
set(_var_version_id "${CMAKE_MATCH_2}")
endif()
endforeach()
endif()
endif()
string(TOLOWER "${_var_id}" "_var_id")
string(STRIP "${_var_id}" _var_id)
string(STRIP "${_var_version_id}" _var_version_id)
# Remove any enclosing quotation marks
string(REGEX REPLACE "^\"(.*)\"$" "\\1" _var_id "${_var_id}")
string(REGEX REPLACE "^\"(.*)\"$" "\\1" _var_version_id "${_var_version_id}")
if(NOT "${_vn_id}" STREQUAL "")
set(${_vn_id} "${_var_id}" PARENT_SCOPE)
endif()
if(NOT "${_vn_version_id}" STREQUAL "")
set(${_vn_version_id} "${_var_version_id}" PARENT_SCOPE)
endif()
endfunction()
endif(NOT DEFINED _os_release_info)