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#!/bin/sh
set -e
KERNFRAG=${KERNFRAG:-/etc/kernfrag}
RUNNING_CONFIG=$(mktemp --suffix=-kern-config)
zcat /proc/config.gz > "$RUNNING_CONFIG"
# We do want to expand tmpdir now rather than later,
# and mktemp should give us a path without spaces.
# shellcheck disable=SC2064
trap "{ rm $RUNNING_CONFIG; }" EXIT
err() {
printf "kern: %s\n" "$@" >&2
}
errx() {
err "$@"
exit 1
}
need_kernel_source() {
test -r Kbuild -a -r Kconfig || errx "current directory does not contain a kernel source tree, refusing"
}
has_boot_mount() {
awk '{print $2}' /etc/fstab | grep -q ^/boot$
}
is_boot_mounted() {
mountpoint -q /boot
}
mount_boot_on_demand() {
if has_boot_mount && ! is_boot_mounted; then
sudo mount /boot
fi
}
get_latest_kernel() {
eselect --brief kernel list | tail -n1
}
get_selected_kernel() {
readlink /usr/src/linux
}
get_running_kernel() {
uname -r
}
set_kernel() {
kern=${1:-$(get_latest_kernel)}
selected=$(get_selected_kernel)
kerndir=/usr/src/$kern
test -d "$kerndir" || errx "No such file or directory: $kerndir"
if test "$kern" = "$selected"; then
err "Warning: Latest kernel already selected: $kern"
return
fi
printf "Selecting kernel: %s\n" "$kern"
sudo eselect kernel set "$kern"
sudo chown -R "$(id -un)":"$(id -gn)" "$kerndir"
}
config_kernel() {
need_kernel_source
host=${1:-$(hostname)}
test -d "$KERNFRAG" || errx "No such file or directory: $KERNFRAG"
printf "Starting merge for %s...\n\n" "$host"
awk -v prefix="$KERNFRAG/fragments/" '{print prefix $0}' \
"$KERNFRAG/templates/base" "$KERNFRAG/templates/$host" | xargs scripts/kconfig/merge_config.sh
}
diff_kernel() {
need_kernel_source
diff=${1:-$RUNNING_CONFIG}
if command -v git >/dev/null; then
git diff --no-index "$diff" .config
else
diff -u "$diff" .config
fi
}
build_kernel() {
need_kernel_source
make -j"$(nproc)"
}
install_kernel() {
need_kernel_source
mount_boot_on_demand
sudo make install modules_install
}
post_install_kernel() {
sudo emerge --ask=n @module-rebuild
}
clean_kernel() {
sudo eclean-kernel -An3
}
strip_config() {
sed -nE '/^(# )?CONFIG_.*/p' "$1"
}
test_diff() {
dt=$(mktemp)
strip_config "$RUNNING_CONFIG" > "$dt"
if ! strip_config .config | diff -q "$dt" -; then
diff_kernel || true
printf "Continue? [y/N] "
read -r response
if test "$response" != "y"; then
rm "$dt"
return 1
fi
fi
rm "$dt"
}
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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