# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

# This revision is fundamentally different from pf-sources-6.1_p6{,-r1,-r2}.
# Instead of fetching pf-kernel/codeberg's GA-only sourcetree (Linux 6.1.0
# + pf patchset, no linux-stable updates), it builds on top of the same
# vanilla 6.1.tar.xz + Gentoo genpatches stack that gentoo-sources-6.1.X
# uses, then applies a *curated* subset of natalenko's pf-kernel delta
# on top. See pkg_postinst for what's preserved versus what's dropped
# and why. The slot's pretend version stays "6.1_p6" so this ebuild
# remains drop-in-replaceable for users on the existing pf-sources slot.

ETYPE="sources"

# Track the latest 6.1.X linux-stable via genpatches. Match
# gentoo-sources-6.1.170's K_GENPATCHES_VER.
K_GENPATCHES_VER="180"

# Curated pf delta sets EXTRAVERSION via the patch itself.
K_NOSETEXTRAVERSION="1"

# pf-sources has historically carried K_SECURITY_UNSUPPORTED. Even with
# linux-stable now baked in (which closes the largest gap), we keep the
# flag because the curated pf delta is not covered by Gentoo's security
# team — bugs in the pf-specific portions (BBRv3, x86 ISA levels,
# zstd bump, v4l2loopback, DDCCI) need to be reported to natalenko or
# the overlay maintainers.
K_SECURITY_UNSUPPORTED="1"

K_WANT_GENPATCHES="base extras"

# Map "6.1_p6" → "6.1" for the kernel.org tarball + genpatches.
SHPV="${PV/_p*/}"

# Pretend version visible in /lib/modules and /usr/src.
PFPV="${PV/_p/-pf}"

inherit kernel-2 optfeature

DESCRIPTION="Linux kernel: gentoo-sources base + curated pf-kernel patchset"
HOMEPAGE="https://pfkernel.natalenko.name/
	https://dev.gentoo.org/~alicef/genpatches/"

# Vanilla 6.1 from kernel.org + Gentoo's genpatches (stable + non-stable)
# + our curated pf delta. The codeberg pf-kernel tarball is intentionally
# not fetched — its content is replaced by the much smaller curated
# patch series, hosted in the stuff overlay's sister "extra-stuff" repo
# (https://github.com/istitov/extra-stuff) to keep this overlay's files/
# tree small. The tag in the URL pins an immutable snapshot; bumping
# patches means a new tag suffix (-r70-1, -r70-2, ...).
SRC_URI="https://www.kernel.org/pub/linux/kernel/v6.x/linux-${SHPV}.tar.xz
	https://dev.gentoo.org/~alicef/dist/genpatches/genpatches-${SHPV}-${K_GENPATCHES_VER}.base.tar.xz
	https://dev.gentoo.org/~alicef/dist/genpatches/genpatches-${SHPV}-${K_GENPATCHES_VER}.extras.tar.xz
	https://raw.githubusercontent.com/istitov/extra-stuff/pf-curated-${SHPV}-r70-0/sys-kernel/pf-sources/pf-curated-${SHPV}.tar.xz -> pf-curated-${SHPV}-r70-0.tar.xz"

S="${WORKDIR}/linux-${SHPV}"

KEYWORDS="~amd64 ~x86"

K_EXTRAEINFO="For more info on pf-sources and details on how to report problems,
	see: ${HOMEPAGE}."

pkg_setup() {
	ewarn ""
	ewarn "${PN} is *not* supported by the Gentoo Kernel Project in any way."
	ewarn "If you need support, please contact the pf developers directly."
	ewarn "Do *not* open bugs in Gentoo's bugzilla unless you have issues with"
	ewarn "the ebuilds. Thank you."
	ewarn ""

	kernel-2_pkg_setup
}

src_unpack() {
	# Vanilla kernel.org tarball unpacks to linux-${SHPV} directly; no
	# rename needed.
	unpack ${A}
}

src_prepare() {
	# Apply genpatches stack. Unlike pf-sources -r1/-r2, we DO NOT
	# delete `1*linux*.patch` — the linux-stable backport chain
	# (1000_linux-${SHPV}.1.patch through 1NNN_linux-${SHPV}.X.patch)
	# is the entire point of this revision.
	eapply "${WORKDIR}"/*.patch

	# Curated pf-kernel delta on top of gentoo-sources state, as a
	# numbered series of per-feature patches re-cut from natalenko's
	# pf-kernel branches (codeberg.org/pf-kernel/linux). Filename order
	# is apply order; each patch's header explains which natalenko
	# branch + tip SHA it was derived from. The series ships in a
	# tarball from extra-stuff (see SRC_URI); unpack drops it at
	# ${WORKDIR}/pf-curated-${SHPV}/. See pkg_postinst for the
	# kept/dropped breakdown.
	eapply "${WORKDIR}/pf-curated-${SHPV}"/*.patch

	default
}

pkg_postinst() {
	# Fixes "wrongly" detected directory name, bgo#862534.
	local KV_FULL="${PFPV}"
	kernel-2_pkg_postinst

	elog ""
	elog "This revision (-r70) is the gentoo-sources-based pf-sources variant."
	elog "It tracks linux-stable (6.1.X) via Gentoo's genpatches AND keeps a"
	elog "curated subset of natalenko's pf-kernel delta on top. CVE backports"
	elog "now arrive automatically with each gentoo-sources stable bump; the"
	elog "earlier per-CVE patches in files/ no longer apply against this base."
	elog ""
	elog "Curated pf features RETAINED from natalenko's patchset:"
	elog "  * BBRv3 TCP congestion control + Kconfig"
	elog "  * x86 ISA levels (MK8SSE3, MK10, MBARCELONA, MZEN/2/3, MNATIVE_INTEL,"
	elog "    MNATIVE_AMD, etc.) for arch-specific tuning"
	elog "  * zstd compression library bump"
	elog "  * v4l2loopback driver"
	elog "  * DDCCI / DDCCI-backlight drivers"
	elog "  * syscall.tbl additions across architectures"
	elog "  * vmlinux.lds.S section additions"
	elog ""
	elog "Patches DROPPED from natalenko's patchset, with reasons:"
	elog "  * fs/cifs/* + fs/ksmbd/* (29 files): linux-stable backported the"
	elog "    fs/cifs → fs/smb/{client,server} rename together with substantial"
	elog "    code rework. pf's pre-rewrite patches are obsolete (90% conflict"
	elog "    rate even after path rewriting); stable's rework supersedes them."
	elog "  * kernel/futex/{core,syscalls}.c: most differences were comment"
	elog "    wording; the one functional addition (futex_parse_waitv before"
	elog "    futex_wait_multiple) wasn't worth the per-bump merge cost."
	elog "  * kernel/sched/{core,fair,psi}.c: gentoo-sources has newer scheduler"
	elog "    helpers (e.g. util_fits_cpu replacing task_fits_capacity, with"
	elog "    full uclamp/thermal handling). Keeping pf's older form would"
	elog "    regress, not improve, scheduler behaviour."
	elog ""
	elog "If you specifically need pf-kernel's scheduler heuristics, futex2"
	elog "extensions, or the pre-rewrite SMB stack, install pf-sources-6.1_p6"
	elog "(without -r70) instead — it stays GA-frozen and ships natalenko's"
	elog "patchset verbatim, at the cost of missing linux-stable security fixes."
	elog ""

	optfeature "userspace KSM helper" sys-process/uksmd
}

pkg_postrm() {
	# Same here, bgo#862534.
	local KV_FULL="${PFPV}"
	kernel-2_pkg_postrm
}