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gnss-sdr/cmake/Modules/DetectLinuxDistro.cmake
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# GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
# This file is part of GNSS-SDR.
#
# SPDX-FileCopyrightText: 2011-2026 C. Fernandez-Prades cfernandez(at)cttc.es
# SPDX-License-Identifier: BSD-3-Clause
# Output variables
#
# ARCHITECTURE_STRING
# Human-readable host architecture suffix used in status messages.
# For older CMake versions this is "(64 bits)" or "(32 bits)";
# for newer CMake versions this is "(${CMAKE_HOST_SYSTEM_PROCESSOR})".
#
# LINUX_DISTRIBUTION
# Human-readable Linux distribution name, for example "Ubuntu",
# "Debian", "Fedora", "LinuxMint", "Alpine Linux", or "Generic".
#
# LINUX_VER
# Distribution version string when available. This may be numeric
# such as "24.04", "12.5", or "9.3", or a rolling/testing label
# such as "edge" or "trixie/sid".
#
# LINUX_ID
# Normalized lower-case distribution identifier when available,
# usually matching /etc/os-release ID, for example "ubuntu",
# "debian", "fedora", "rhel", "linuxmint", "alpine", or "arch".
#
# LINUX_PRETTY_NAME
# Pretty distribution name from /etc/os-release PRETTY_NAME when
# available. This is informational and may be empty.
#
# LINUX_VERSION_CODENAME
# Distribution codename when available, for example "jammy",
# "noble", "bookworm", or "trixie". This is informational and
# may be empty.
#
# LINUX_ID_RESULT
# Detection status for the distribution identity. Set to 0 when a
# distribution was positively identified; left as 1 for the generic
# fallback.
#
# LINUX_VER_RESULT
# Detection status for the distribution version. Set to 0 when a
# version string was found; left as 1 when no version was detected.
# text file at `filename` and store it in `output_variable` in the
# caller's scope.
# Both quoted ("value") and unquoted values are supported. Leading/trailing
# whitespace is stripped. If the file does not exist or the key is absent,
# `output_variable` is set to the empty string.
function(_gnsssdr_read_key_value_file filename key output_variable)
set(${output_variable} "" PARENT_SCOPE)
if(NOT EXISTS "${filename}")
return()
endif()
file(STRINGS "${filename}" _gnsssdr_key_value_line
REGEX "^${key}="
LIMIT_COUNT 1
)
if(NOT "${_gnsssdr_key_value_line}" STREQUAL "")
string(REGEX REPLACE
"^[^=]*="
""
_gnsssdr_key_value
"${_gnsssdr_key_value_line}"
)
string(REGEX REPLACE
"^\"(.*)\"$"
"\\1"
_gnsssdr_key_value
"${_gnsssdr_key_value}"
)
string(REGEX REPLACE
"^'(.*)'$"
"\\1"
_gnsssdr_key_value
"${_gnsssdr_key_value}"
)
string(STRIP "${_gnsssdr_key_value}" _gnsssdr_key_value)
set(${output_variable} "${_gnsssdr_key_value}" PARENT_SCOPE)
endif()
endfunction()
# ---------------------------------------------------------------------------
# Architecture string
# ---------------------------------------------------------------------------
if(CMAKE_VERSION VERSION_LESS 3.19)
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
set(ARCHITECTURE_STRING "(64 bits)")
else()
set(ARCHITECTURE_STRING "(32 bits)")
endif()
else()
set(ARCHITECTURE_STRING "(${CMAKE_HOST_SYSTEM_PROCESSOR})")
endif()
# ---------------------------------------------------------------------------
# Initialise output variables
# ---------------------------------------------------------------------------
set(LINUX_DISTRIBUTION "")
set(LINUX_VER "")
set(LINUX_ID "")
set(LINUX_PRETTY_NAME "")
set(LINUX_VERSION_CODENAME "")
set(LINUX_ID_RESULT 1)
set(LINUX_VER_RESULT 1)
# ---------------------------------------------------------------------------
# 1. /etc/os-release -- the systemd-era standard; present on virtually all
# modern distributions.
# ---------------------------------------------------------------------------
if(EXISTS "/etc/os-release")
_gnsssdr_read_key_value_file(
"/etc/os-release" "ID" _gnsssdr_os_id)
_gnsssdr_read_key_value_file(
"/etc/os-release" "NAME" _gnsssdr_os_name)
_gnsssdr_read_key_value_file(
"/etc/os-release" "PRETTY_NAME" LINUX_PRETTY_NAME)
_gnsssdr_read_key_value_file(
"/etc/os-release" "VERSION_ID" _gnsssdr_os_version_id)
_gnsssdr_read_key_value_file(
"/etc/os-release" "VERSION_CODENAME" LINUX_VERSION_CODENAME)
if(NOT "${_gnsssdr_os_id}" STREQUAL "")
set(LINUX_ID "${_gnsssdr_os_id}")
endif()
if(NOT "${_gnsssdr_os_name}" STREQUAL "")
if("${LINUX_ID}" STREQUAL "debian")
set(LINUX_DISTRIBUTION "Debian")
elseif("${LINUX_ID}" STREQUAL "linuxmint")
set(LINUX_DISTRIBUTION "LinuxMint")
else()
set(LINUX_DISTRIBUTION "${_gnsssdr_os_name}")
endif()
set(LINUX_ID_RESULT 0)
endif()
if("${LINUX_DISTRIBUTION}" STREQUAL "" AND NOT "${LINUX_ID}" STREQUAL "")
set(LINUX_DISTRIBUTION "${LINUX_ID}")
set(LINUX_ID_RESULT 0)
endif()
if(NOT "${_gnsssdr_os_version_id}" STREQUAL "")
set(LINUX_VER "${_gnsssdr_os_version_id}")
set(LINUX_VER_RESULT 0)
endif()
endif()
# ---------------------------------------------------------------------------
# 2. /etc/lsb-release -- fallback for older distributions where os-release may
# be absent or incomplete.
# ---------------------------------------------------------------------------
if(("${LINUX_DISTRIBUTION}" STREQUAL "" OR "${LINUX_VER}" STREQUAL "") AND
EXISTS "/etc/lsb-release")
_gnsssdr_read_key_value_file(
"/etc/lsb-release" "DISTRIB_ID" _gnsssdr_lsb_distrib_id)
_gnsssdr_read_key_value_file(
"/etc/lsb-release" "DISTRIB_RELEASE" _gnsssdr_lsb_distrib_release)
_gnsssdr_read_key_value_file(
"/etc/lsb-release" "DISTRIB_CODENAME" _gnsssdr_lsb_distrib_codename)
if("${LINUX_ID}" STREQUAL "" AND
NOT "${_gnsssdr_lsb_distrib_id}" STREQUAL "")
string(TOLOWER "${_gnsssdr_lsb_distrib_id}" LINUX_ID)
# Collapse spaces so e.g. "Linux Mint" becomes "linuxmint", matching
# the canonical ID used in os-release on modern Mint installations.
string(REPLACE " " "" LINUX_ID "${LINUX_ID}")
endif()
if("${LINUX_DISTRIBUTION}" STREQUAL "" AND
NOT "${_gnsssdr_lsb_distrib_id}" STREQUAL "")
if("${LINUX_ID}" STREQUAL "linuxmint")
set(LINUX_DISTRIBUTION "LinuxMint")
else()
set(LINUX_DISTRIBUTION "${_gnsssdr_lsb_distrib_id}")
endif()
set(LINUX_ID_RESULT 0)
endif()
if("${LINUX_VER}" STREQUAL "" AND
NOT "${_gnsssdr_lsb_distrib_release}" STREQUAL "")
set(LINUX_VER "${_gnsssdr_lsb_distrib_release}")
set(LINUX_VER_RESULT 0)
endif()
# Populate the codename if os-release did not already provide it.
if("${LINUX_VERSION_CODENAME}" STREQUAL "" AND
NOT "${_gnsssdr_lsb_distrib_codename}" STREQUAL "")
set(LINUX_VERSION_CODENAME "${_gnsssdr_lsb_distrib_codename}")
endif()
unset(_gnsssdr_lsb_distrib_id)
unset(_gnsssdr_lsb_distrib_release)
unset(_gnsssdr_lsb_distrib_codename)
endif()
# ---------------------------------------------------------------------------
# 3. /etc/debian_version -- Debian's own file often carries a more precise
# point-release string (e.g. "12.5") than VERSION_ID in os-release.
# Applied only for Debian itself, not derivatives.
# ---------------------------------------------------------------------------
if("${LINUX_ID}" STREQUAL "debian" AND EXISTS "/etc/debian_version")
file(READ "/etc/debian_version" _gnsssdr_debian_version)
string(STRIP "${_gnsssdr_debian_version}" _gnsssdr_debian_version)
string(REGEX MATCH "^[0-9]" _gnsssdr_debian_is_numeric
"${_gnsssdr_debian_version}")
if(NOT "${_gnsssdr_debian_is_numeric}" STREQUAL "")
# Numeric: always prefer -- more precise than os-release VERSION_ID.
set(LINUX_VER "${_gnsssdr_debian_version}")
set(LINUX_VER_RESULT 0)
elseif("${LINUX_VER}" STREQUAL "" AND
NOT "${_gnsssdr_debian_version}" STREQUAL "")
# Non-numeric (e.g. "trixie/sid"): use only as a last resort.
set(LINUX_VER "${_gnsssdr_debian_version}")
set(LINUX_VER_RESULT 0)
endif()
unset(_gnsssdr_debian_is_numeric)
unset(_gnsssdr_debian_version)
endif()
# ---------------------------------------------------------------------------
# 4. /etc/redhat-release -- Red Hat, CentOS, CentOS Stream, Fedora, Rocky,
# AlmaLinux, Oracle Linux, and other RHEL-family distributions.
# ---------------------------------------------------------------------------
if(("${LINUX_DISTRIBUTION}" STREQUAL "" OR
"${LINUX_VER}" STREQUAL "" OR
"${LINUX_ID}" STREQUAL "") AND
EXISTS "/etc/redhat-release")
file(READ "/etc/redhat-release" _gnsssdr_redhat_release)
string(STRIP "${_gnsssdr_redhat_release}" _gnsssdr_redhat_release)
if("${LINUX_DISTRIBUTION}" STREQUAL "")
# Extract the human-readable name: everything up to the keyword
# "release" or the first digit, whichever comes first.
string(REGEX MATCH
"^([A-Za-z][A-Za-z0-9 ]*[A-Za-z])[ ]+(release|[0-9])"
_gnsssdr_rh_name_match
"${_gnsssdr_redhat_release}"
)
if(NOT "${_gnsssdr_rh_name_match}" STREQUAL "")
string(REGEX REPLACE
"^([A-Za-z][A-Za-z0-9 ]*[A-Za-z])[ ]+(release|[0-9]).*$"
"\\1"
_gnsssdr_rh_name
"${_gnsssdr_redhat_release}"
)
string(STRIP "${_gnsssdr_rh_name}" _gnsssdr_rh_name)
else()
# Fallback: take every leading alphabetic word.
string(REGEX MATCH "^[A-Za-z ]+" _gnsssdr_rh_name
"${_gnsssdr_redhat_release}")
string(STRIP "${_gnsssdr_rh_name}" _gnsssdr_rh_name)
endif()
if(NOT "${_gnsssdr_rh_name}" STREQUAL "")
set(LINUX_DISTRIBUTION "${_gnsssdr_rh_name}")
else()
set(LINUX_DISTRIBUTION "Red Hat")
endif()
set(LINUX_ID_RESULT 0)
unset(_gnsssdr_rh_name)
unset(_gnsssdr_rh_name_match)
endif()
# Derive a compact, lower-case ID token (e.g. "rhel", "centos",
# "fedora", "rocky", "almalinux", "ol") when os-release did not
# already provide one.
if("${LINUX_ID}" STREQUAL "" AND
NOT "${LINUX_DISTRIBUTION}" STREQUAL "")
string(TOLOWER "${LINUX_DISTRIBUTION}" _gnsssdr_rh_id)
# Map well-known verbose names to their canonical short IDs.
if("${_gnsssdr_rh_id}" MATCHES "red hat")
set(LINUX_ID "rhel")
elseif("${_gnsssdr_rh_id}" MATCHES "centos stream")
set(LINUX_ID "centos-stream")
elseif("${_gnsssdr_rh_id}" MATCHES "centos")
set(LINUX_ID "centos")
elseif("${_gnsssdr_rh_id}" MATCHES "fedora")
set(LINUX_ID "fedora")
elseif("${_gnsssdr_rh_id}" MATCHES "rocky")
set(LINUX_ID "rocky")
elseif("${_gnsssdr_rh_id}" MATCHES "alma")
set(LINUX_ID "almalinux")
elseif("${_gnsssdr_rh_id}" MATCHES "oracle")
set(LINUX_ID "ol")
else()
# Replace spaces with hyphens for unknown names, e.g.
# "some linux" -> "some-linux".
string(REPLACE " " "-" _gnsssdr_rh_id "${_gnsssdr_rh_id}")
set(LINUX_ID "${_gnsssdr_rh_id}")
endif()
unset(_gnsssdr_rh_id)
endif()
if("${LINUX_VER}" STREQUAL "")
# Extract the numeric X.Y version; fall back to a bare integer
# (e.g. Fedora uses a single number).
string(REGEX MATCH "[0-9]+\\.[0-9]+" LINUX_VER
"${_gnsssdr_redhat_release}")
if("${LINUX_VER}" STREQUAL "")
string(REGEX MATCH "[0-9]+" LINUX_VER
"${_gnsssdr_redhat_release}")
endif()
if(NOT "${LINUX_VER}" STREQUAL "")
set(LINUX_VER_RESULT 0)
endif()
endif()
unset(_gnsssdr_redhat_release)
endif()
# ---------------------------------------------------------------------------
# 5. /etc/debian_version without a prior ID -- Debian-based system that
# lacked os-release entirely.
# ---------------------------------------------------------------------------
if("${LINUX_DISTRIBUTION}" STREQUAL "" AND EXISTS "/etc/debian_version")
set(LINUX_DISTRIBUTION "Debian")
set(LINUX_ID "debian")
set(LINUX_ID_RESULT 0)
file(READ "/etc/debian_version" _gnsssdr_debian_version)
string(STRIP "${_gnsssdr_debian_version}" _gnsssdr_debian_version)
if(NOT "${_gnsssdr_debian_version}" STREQUAL "")
set(LINUX_VER "${_gnsssdr_debian_version}")
set(LINUX_VER_RESULT 0)
endif()
unset(_gnsssdr_debian_version)
endif()
# ---------------------------------------------------------------------------
# 6. /etc/alpine-release -- Alpine Linux.
# This file contains only a bare version string, e.g. "3.19.1" or "edge".
# ---------------------------------------------------------------------------
if(("${LINUX_DISTRIBUTION}" STREQUAL "" OR
"${LINUX_VER}" STREQUAL "" OR
"${LINUX_ID}" STREQUAL "") AND
EXISTS "/etc/alpine-release")
if("${LINUX_DISTRIBUTION}" STREQUAL "")
set(LINUX_DISTRIBUTION "Alpine Linux")
set(LINUX_ID_RESULT 0)
endif()
if("${LINUX_ID}" STREQUAL "")
set(LINUX_ID "alpine")
endif()
if("${LINUX_VER}" STREQUAL "")
file(READ "/etc/alpine-release" _gnsssdr_alpine_version)
string(STRIP "${_gnsssdr_alpine_version}" _gnsssdr_alpine_version)
if(NOT "${_gnsssdr_alpine_version}" STREQUAL "")
set(LINUX_VER "${_gnsssdr_alpine_version}")
set(LINUX_VER_RESULT 0)
endif()
unset(_gnsssdr_alpine_version)
endif()
endif()
# ---------------------------------------------------------------------------
# 7. /etc/arch-release -- Arch Linux (rolling; no meaningful version number).
# ---------------------------------------------------------------------------
if("${LINUX_DISTRIBUTION}" STREQUAL "" AND EXISTS "/etc/arch-release")
set(LINUX_DISTRIBUTION "Arch Linux")
set(LINUX_ID "arch")
set(LINUX_VER "")
set(LINUX_ID_RESULT 0)
endif()
# ---------------------------------------------------------------------------
# 8. Last-resort generic fallback.
# ---------------------------------------------------------------------------
if("${LINUX_DISTRIBUTION}" STREQUAL "")
set(LINUX_DISTRIBUTION "Generic")
set(LINUX_VER "Unknown")
endif()
# ---------------------------------------------------------------------------
# Clean up intermediate variables used at include scope.
# ---------------------------------------------------------------------------
unset(_gnsssdr_os_id)
unset(_gnsssdr_os_name)
unset(_gnsssdr_os_version_id)
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