From 070a66509cc8c0df7122587944005a0131b210d8 Mon Sep 17 00:00:00 2001
From: Wynn Wolf Arbor
Date: Sat, 29 Feb 2020 19:23:38 +0100
Subject: Initial import

---
 LICENSE  |  13 +++++++
 Makefile |   6 ++++
 kern     | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 137 insertions(+)
 create mode 100644 LICENSE
 create mode 100644 Makefile
 create mode 100755 kern

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..efa24df
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,13 @@
+Copyright 2018-2019 Wynn Wolf Arbor <wolf@oriole.systems>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8a3008a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+PREFIX ?= /usr/local
+
+install: kern
+	install -D -m 755 -t '${DESTDIR}${PREFIX}/bin' kern
+
+.PHONY: install
diff --git a/kern b/kern
new file mode 100755
index 0000000..23822e1
--- /dev/null
+++ b/kern
@@ -0,0 +1,118 @@
+#!/bin/sh
+
+set -e
+
+SRCDIR=/usr/src
+KERNFRAG=${KERNFRAG:-/etc/kernfrag}
+
+errx() {
+	printf "kern: %s\n" "$@" >&2
+	exit 1
+}
+
+has_boot_mount() {
+	awk '{print $2}' /etc/fstab | grep -q ^/boot$
+}
+
+get_latest_kernel() {
+	eselect --brief kernel list | tail -n1
+}
+
+get_current_kernel() {
+	basename "$(eselect --brief kernel show)"
+}
+
+set_kernel() {
+	kern=${1:-$(get_latest_kernel)}
+	current=$(get_current_kernel)
+	kerndir=$SRCDIR/$kern
+
+	if test ! -d "$kerndir"; then
+		errx "No such file or directory: $kerndir"
+	fi
+
+	if test "$kern" = "$current"; then
+		errx "Latest kernel already set: $kern"
+	fi
+
+	printf "Setting active kernel: %s\n" "$kern"
+
+	sudo eselect kernel set "$kern"
+	sudo chown -R "$(id -un)":"$(id -gn)" "$kerndir"
+}
+
+config_kernel() {
+	host=${1:-$(hostname)}
+
+	printf "Starting merge for %s...\n\n" "$host"
+
+	awk -v prefix="$KERNFRAG/fragments/" '{print prefix $0}' \
+		"$KERNFRAG/templates/base" "$KERNFRAG/templates/$host" | xargs scripts/kconfig/merge_config.sh
+}
+
+diff_kernel() {
+	diff=${1:-/proc/config.gz}
+	nvim -d .config "$diff"
+}
+
+build_kernel() {
+	make -j"$(nproc)"
+}
+
+install_kernel() {
+	if has_boot_mount; then
+		sudo mount /boot
+	fi
+	sudo make install modules_install
+}
+
+post_install_kernel() {
+	sudo emerge --ask=n @module-rebuild
+}
+
+clean_kernel() {
+	sudo eclean-kernel -An3
+}
+
+test_diff() {
+	dt=$(mktemp)
+	zcat /proc/config.gz | sed -nE '/^(# )?CONFIG_.*/p' > "$dt"
+	sed -nE '/^(# )?CONFIG_.*/p' .config | diff -q "$dt" -
+	diffr=$?
+	rm -f "$dt"
+	if test $diffr -ne 0; then
+		diff_kernel
+		printf "Configs differ, exiting.\n"
+	fi
+	return $diffr
+}
+
+all() {
+	set_kernel &&
+	cd /usr/src/linux &&
+	config_kernel &&
+	test_diff &&
+	build_kernel &&
+	install_kernel &&
+	post_install_kernel &&
+	clean_kernel
+}
+
+if test $# -eq 0; then
+	all
+	exit 0
+fi
+
+cmd=$1
+shift
+
+case $cmd in
+	set) set_kernel "$@";;
+	config) config_kernel "$@";;
+	diff) diff_kernel "$@";;
+	build) build_kernel;;
+	install) install_kernel;;
+	postinst) post_install_kernel;;
+	clean) clean_kernel;;
+	all) all;;
+esac
-- 
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