LINUX-INFO.ECLASS

Section: eclass-manpages (5)
Updated: Apr 2024
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NAME

linux-info.eclass - eclass used for accessing kernel related information

DESCRIPTION

This eclass is used as a central eclass for accessing kernel related information for source or binary already installed. It is vital for linux-mod.eclass to function correctly, and is split out so that any ebuild behaviour "templates" are abstracted out using additional eclasses.

"kernel config" in this file means: The .config of the currently installed sources is used as the first preference, with a fall-back to bundled config (/proc/config.gz) if available.

Before using any of the config-handling functions in this eclass, you must ensure that one of the following functions has been called (in order of preference), otherwise you will get bugs like #364041): linux-info_pkg_setup linux-info_get_any_version get_version get_running_version

SUPPORTED EAPIS

6 7 8

FUNCTIONS

set_arch_to_kernel

Set the env ARCH to match what the kernel expects.

set_arch_to_pkgmgr

Set the env ARCH to match what the package manager expects.

qout

qout <einfo | ewarn | eerror> is a quiet call when EBUILD_PHASE should not have visible output.

qeinfo

qeinfo is a quiet einfo call when EBUILD_PHASE should not have visible output.

qewarn

qewarn is a quiet ewarn call when EBUILD_PHASE should not have visible output.

qeerror

qeerror is a quiet error call when EBUILD_PHASE should not have visible output.

getfilevar <variable> <configfile>

It detects the value of the variable defined in the file 'configfile'. This is done by including the 'configfile', and printing the variable with Make. It WILL break if your makefile has missing dependencies!

Return value: the value of the variable

getfilevar_noexec <variable> <configfile>

It detects the value of the variable defined in the file 'configfile'. This is done with sed matching an expression only. If the variable is defined, you will run into problems. See getfilevar for those cases.

Return value: the value of the variable

linux_config_src_exists

It returns true if .config exists in a build directory otherwise false

Return value: true or false

linux_config_bin_exists

It returns true if .config exists in /proc, otherwise false

Return value: true or false

linux_config_exists

It returns true if .config exists otherwise false

This function MUST be checked before using any of the linux_chkconfig_* functions.

Return value: true or false

linux_config_path

Echo the name of the config file to use. If none are found, then return false.

require_configured_kernel

This function verifies that the current kernel is configured (it checks against the existence of .config) otherwise it dies.

linux_chkconfig_present <option>

It checks that CONFIG_<option>=y or CONFIG_<option>=m is present in the current kernel .config If linux_config_exists returns false, the results of this are UNDEFINED. You MUST call linux_config_exists first.

Return value: true or false

linux_chkconfig_module <option>

It checks that CONFIG_<option>=m is present in the current kernel .config If linux_config_exists returns false, the results of this are UNDEFINED. You MUST call linux_config_exists first.

Return value: true or false

linux_chkconfig_builtin <option>

It checks that CONFIG_<option>=y is present in the current kernel .config If linux_config_exists returns false, the results of this are UNDEFINED. You MUST call linux_config_exists first.

Return value: true or false

linux_chkconfig_string <option>

It prints the CONFIG_<option> value of the current kernel .config (it requires a configured kernel). If linux_config_exists returns false, the results of this are UNDEFINED. You MUST call linux_config_exists first.

Return value: CONFIG_<option>

kernel_is [-lt -gt -le -ge -eq] <major_number> [minor_number patch_number]

It returns true when the current kernel version satisfies the comparison against the passed version. -eq is the default comparison.

For Example where KV = 2.6.9
kernel_is 2 4   returns false
kernel_is 2     returns true
kernel_is 2 6   returns true
kernel_is 2 6 8 returns false
kernel_is 2 6 9 returns true

Return value: true or false

get_version

It gets the version of the kernel inside KERNEL_DIR and populates the KV_FULL variable (if KV_FULL is already set it does nothing).

The kernel version variables (KV_MAJOR, KV_MINOR, KV_PATCH, KV_EXTRA and KV_LOCAL) are also set.

The KV_DIR is set using the KERNEL_DIR env var, the KV_OUT_DIR is set using a valid KBUILD_OUTPUT (in a decreasing priority list, we look for the env var, makefile var or the symlink /lib/modules/${KV_MAJOR}.${KV_MINOR}.${KV_PATCH}${KV_EXTRA}/build).

get_running_version

It gets the version of the current running kernel and the result is the same as get_version() if the function can find the sources.

linux-info_get_any_version

This attempts to find the version of the sources, and otherwise falls back to the version of the running kernel.

check_kernel_built

This function verifies that the current kernel sources have been already prepared otherwise it dies.

check_modules_supported

This function verifies that the current kernel support modules (it checks CONFIG_MODULES=y) otherwise it dies.

check_extra_config

It checks the kernel config options specified by CONFIG_CHECK. It dies only when a required config option (i.e. the prefix ~ is not used) doesn't satisfy the directive. Ignored on non-Linux systems.

check_zlibinflate

Function to make sure a ZLIB_INFLATE configuration has the required symbols.

linux-info_pkg_setup

Force a get_version() call when inherited from linux-mod.eclass and then check if the kernel is configured to support the options specified in CONFIG_CHECK (if not null)

kernel_get_makefile

Support the possibility that the Makefile could be one of the following and should be checked in the order described here: https://www.gnu.org/software/make/manual/make.html Order of checking and valid Makefiles names: GNUMakefile, makefile, Makefile

ECLASS VARIABLES

CHECKCONFIG_DONOTHING ?= "" (USER VARIABLE)

Do not error out in check_extra_config if CONFIG settings are not met. This is a user flag and should under _no circumstances_ be set in the ebuild.

KERNEL_DIR = "${KERNEL_DIR:-${ROOT%/}/usr/src/linux}"

A string containing the directory of the target kernel sources. The default value is "/usr/src/linux"

CONFIG_CHECK

A string containing a list of .config options to check for before proceeding with the install.

e.g.: CONFIG_CHECK="MTRR"

You can also check that an option doesn't exist by prepending it with an exclamation mark (!).

e.g.: CONFIG_CHECK="!MTRR"

To simply warn about a missing option, prepend a '~'. It may be combined with '!'.

In general, most checks should be non-fatal. The only time fatal checks should be used is for building kernel modules or cases that a compile will fail without the option.

This is to allow usage of binary kernels, and minimal systems without kernel sources.

ERROR_<CFG>

A string containing the error message to display when the check against CONFIG_CHECK fails. <CFG> should reference the appropriate option used in CONFIG_CHECK.

e.g.: ERROR_MTRR="MTRR exists in the .config but shouldn't!!"

CONFIG_CHECK="CFG" with ERROR_<CFG>="Error Message" will die CONFIG_CHECK="~CFG" with ERROR_<CFG>="Error Message" calls eerror without dying CONFIG_CHECK="~CFG" with WARNING_<CFG>="Warning Message" calls ewarn without dying

KBUILD_OUTPUT

A string passed on commandline, or set from the kernel makefile. It contains the directory which is to be used as the kernel object directory.

KV_FULL (GENERATED BY ECLASS)

A read-only variable. It's a string containing the full kernel version. ie: 2.6.9-gentoo-johnm-r1

KV_MAJOR (GENERATED BY ECLASS)

A read-only variable. It's an integer containing the kernel major version. ie: 2

KV_MINOR (GENERATED BY ECLASS)

A read-only variable. It's an integer containing the kernel minor version. ie: 6

KV_PATCH (GENERATED BY ECLASS)

A read-only variable. It's an integer containing the kernel patch version. ie: 9

KV_EXTRA (GENERATED BY ECLASS)

A read-only variable. It's a string containing the kernel EXTRAVERSION. ie: -gentoo

KV_LOCAL (GENERATED BY ECLASS)

A read-only variable. It's a string containing the kernel LOCALVERSION concatenation. ie: -johnm

KV_DIR (GENERATED BY ECLASS)

A read-only variable. It's a string containing the kernel source directory, will be null if KERNEL_DIR is invalid.

KV_OUT_DIR (GENERATED BY ECLASS)

A read-only variable. It's a string containing the kernel object directory, will be KV_DIR unless KBUILD_OUTPUT is used. This should be used for referencing .config.

SKIP_KERNEL_CHECK ?= "" (USER VARIABLE)

Do not check for kernel sources or a running kernel version. Main use-case is for chroots. This is a user flag and should under _no circumstances_ be set in the ebuild.

AUTHORS

Original author: John Mylchreest <johnm@gentoo.org>

MAINTAINERS

kernel@gentoo.org

REPORTING BUGS

Please report bugs via https://bugs.gentoo.org/

FILES

linux-info.eclass

This document was created by man2html, using the manual pages.
Time: 03:27:01 GMT, April 26, 2024

LINUX-INFO.ECLASS

NAME

DESCRIPTION

SUPPORTED EAPIS

FUNCTIONS

ECLASS VARIABLES

AUTHORS

MAINTAINERS

REPORTING BUGS

FILES

SEE ALSO

Index