KERNEL-2.ECLASS

Section: eclass-manpages (5)
Updated: Oct 2025
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NAME

kernel-2.eclass - Eclass for kernel packages

DESCRIPTION

This is the kernel.eclass rewrite for a clean base regarding the 2.6 series of kernel with back-compatibility for 2.4 Please direct your bugs to the current eclass maintainer :) added functionality: unipatch - a flexible, singular method to extract, add and remove patches.

SUPPORTED EAPIS

7 8

FUNCTIONS

debug-print-kernel2-variables: this function exists only to help debug kernel-2.eclass if you are adding new functionality in, put a call to it at the start of src_unpack, or during SRC_URI/dep generation.
handle_genpatches [--set-unipatch-list]: add genpatches to list of patches to apply if wanted
detect_version: this function will detect and set - OKV: Original Kernel Version (2.6.0/2.6.0-test11) - KV: Kernel Version (2.6.0-gentoo/2.6.0-test11-gentoo-r1) - EXTRAVERSION: The additional version appended to OKV (-gentoo/-gentoo-r1)
kernel_is <conditional version | version>: user for comparing kernel versions or just identifying a version e.g kernel_is 2 4 e.g kernel_is ge 4.8.11 Note: duplicated in linux-info.eclass
kernel_header_destdir: return header destination directory
cross_pre_c_headers: set use if necessary for cross compile support
env_setup_kernel_makeopts: Set the toolchain variables, as well as ARCH and CROSS_COMPILE when cross-compiling.
universal_unpack: unpack kernel sources
unpack_set_extraversion: handle EXTRAVERSION
unpack_fix_install_path: Should be done after patches have been applied Otherwise patches that modify the same area of Makefile will fail
install_universal: Fix permissions in tarball
install_headers: Install headers
install_sources: Install sources
preinst_headers: Headers preinst steps
postinst_sources: Sources post installation function. see inline comments
setup_headers: Determine if ${PN} supports arch
unipatch <list of patches to apply>: Universal function that will apply patches to source
getfilevar <variable> <configfile>: pulled from linux-info
detect_arch: This function sets ARCH_URI and ARCH_PATCH with the necessary info for the arch specific compatibility patchsets.
headers___fix: Voodoo to partially fix broken upstream headers. note: do not put inline/asm/volatile together (breaks "inline asm volatile")
kernel-2_src_unpack: unpack sources, handle genpatches, deblob
kernel-2_src_prepare: Apply any user patches
kernel-2_src_compile: conpile headers or run deblob script
kernel-2_src_test: if you leave it to the default src_test, it will run make to find whether test/check targets are present; since "make test" actually produces a few support files, they are installed even though the package is binchecks-restricted.
Avoid this altogether by making the function moot.
kernel-2_pkg_preinst: if ETYPE = headers, call preinst_headers
kernel-2_src_install: Install headers or sources dependent on ETYPE
kernel-2_pkg_postinst: call postinst_sources for ETYPE = sources
kernel-2_pkg_setup: check for supported kernel version, die if ETYPE is unknown, call setup_headers if necessary
kernel-2_pkg_postrm: Notify the user that after a depclean, there may be sources left behind that need to be manually cleaned

ECLASS VARIABLES

CKV: Used as a comparison kernel version, which is used when PV doesn't reflect the genuine kernel version. This gets set to the portage style versioning. ie: CKV=2.6.11_rc4
EXTRAVERSION: The additional version appended to OKV (-gentoo/-gentoo-r1)
H_SUPPORTEDARCH: this should be a space separated list of ARCH's which can be supported by the headers ebuild
K_BASE_VER: for git-sources, declare the base version this patch is based off of.
K_DEBLOB_AVAILABLE: A value of "0" will disable all of the optional deblob code. If empty, will be set to "1" if deblobbing is possible. Test ONLY for "1".
K_DEBLOB_TAG: This will be the version of deblob script. It's a upstream SVN tag such asw -gnu or -gnu1.
K_DEFCONFIG: Allow specifying a different defconfig target. If length zero, defaults to "defconfig".
K_EXP_GENPATCHES_PULL: If set, we pull "experimental" regardless of the USE FLAG but expect the ebuild maintainer to use K_EXP_GENPATCHES_LIST.
K_EXP_GENPATCHES_NOUSE: If set, no USE flag will be provided for "experimental"; as a result the user cannot choose to apply those patches.
K_EXP_GENPATCHES_LIST: A list of patches to pick from "experimental" to apply when the USE flag is unset and K_EXP_GENPATCHES_PULL is set.
K_EXTRAEINFO: this is a new-line separated list of einfo displays in postinst and can be used to carry additional postinst messages
K_EXTRAELOG: same as K_EXTRAEINFO except using elog instead of einfo
K_EXTRAEWARN: same as K_EXTRAEINFO except using ewarn instead of einfo
K_FROM_GIT: If set, this variable signals that the kernel sources derives from a git tree and special handling will be applied so that any patches that are applied will actually apply.
K_GENPATCHES_VER: The version of the genpatches tarball(s) to apply. A value of "5" would apply genpatches-2.6.12-5 to my-sources-2.6.12.ebuild
K_LONGTERM: If set, the eclass will search for the kernel source in the long term directories on the upstream servers as the location has been changed by upstream
K_NODRYRUN: if this is set then patch --dry-run will not be run. Certain patches will fail with this parameter See bug #507656
K_NOSETEXTRAVERSION: if this is set then EXTRAVERSION will not be automatically set within the kernel Makefile
K_NOUSENAME: if this is set then EXTRAVERSION will not include the first part of ${PN} in EXTRAVERSION
K_NOUSEPR: if this is set then EXTRAVERSION will not include the anything based on ${PR}.
K_PREDEBLOBBED: This kernel was already deblobbed elsewhere. If false, either optional deblobbing will be available or the license will note the inclusion of linux-firmware code.
K_PREPATCHED: if the patchset is prepatched (ie: pf-sources, zen-sources etc) it will use PR (ie: -r5) as the patchset version for and not use it as a true package revision
K_SECURITY_UNSUPPORTED: If set, this kernel is unsupported by Gentoo Security to the current eclass maintainer :)
K_SYMLINK: if this is set, then forcibly create symlink anyway
K_USEPV: When setting the EXTRAVERSION variable, it should add PV to the end. this is useful for things like wolk. IE: EXTRAVERSION would be something like : -wolk-4.19-r1
K_WANT_GENPATCHES: Apply genpatches to kernel source. Provide any combination of "base", "extras" or "experimental".
KERNEL_URI: Upstream kernel src URI
KV (GENERATED BY ECLASS): Kernel Version (2.6.0-gentoo/2.6.0-test11-gentoo-r1)
KV_FULL (GENERATED BY ECLASS): Kernel full version
KV_MAJOR (GENERATED BY ECLASS): Kernel major version from <KV_MAJOR>.<KV_MINOR>.<KV_PATCH
KV_MINOR (GENERATED BY ECLASS): Kernel minor version from <KV_MAJOR>.<KV_MINOR>.<KV_PATCH
KV_PATCH (GENERATED BY ECLASS): Kernel patch version from <KV_MAJOR>.<KV_MINOR>.<KV_PATCH
LINUX_HOSTCFLAGS: Default cflags if not already set
OKV: Original Kernel Version (2.6.0/2.6.0-test11)
RELEASE: Representative of the kernel release tag (-rc3/-git3)
RELEASETYPE: The same as RELEASE but with its numerics stripped (-rc/-git)
UNIPATCH_DOCS: space delimemeted list of docs to be installed to the doc dir
UNIPATCH_EXCLUDE: An addition var to support exclusion based completely on "<passedstring>*" and not "<passedno#>_*" this should _NOT_ be used from the ebuild as this is reserved for end users passing excludes from the cli
UNIPATCH_LIST: space delimetered list of patches to be applied to the kernel
UNIPATCH_STRICTORDER: if this is set places patches into directories of order, so they are applied in the order passed Changing any other variable in this eclass is not supported; you can request for additional variables to be added by contacting the current maintainer. If you do change them, there is a chance that we will not fix resulting bugs; that of course does not mean we're not willing to help.

AUTHORS

John Mylchreest <[email protected]>
Mike Pagano <[email protected]>
<so many, many others, please add yourself>

MAINTAINERS

Gentoo Kernel project <[email protected]>

REPORTING BUGS

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

FILES

kernel-2.eclass

This document was created by man2html, using the manual pages.
Time: 03:27:00 GMT, October 25, 2025