scripts: replace kernel.sh with build-kernel

This newer script is Python-based and smarter than the bash script.
This commit is contained in:
Albert Hopkins 2016-07-24 15:08:27 +00:00
parent 81b7e1cd1b
commit be9f75a457
3 changed files with 128 additions and 35 deletions

View File

@ -155,17 +155,17 @@ $(COMPILE_OPTIONS): $(STAGE3) $(PORTAGE_DIR) configs/make.conf.$(ARCH) configs/l
done done
touch $(COMPILE_OPTIONS) touch $(COMPILE_OPTIONS)
$(KERNEL): $(COMPILE_OPTIONS) $(KERNEL_CONFIG) scripts/kernel.sh $(KERNEL): $(COMPILE_OPTIONS) $(KERNEL_CONFIG) scripts/build-kernel
ifneq ($(EXTERNAL_KERNEL),YES) ifneq ($(EXTERNAL_KERNEL),YES)
@scripts/echo Configuring kernel @scripts/echo Configuring kernel
cp $(KERNEL_CONFIG) $(CHROOT)/root/kernel.config cp $(KERNEL_CONFIG) $(CHROOT)/root/kernel.config
cp scripts/kernel.sh $(CHROOT)/root/kernel.sh cp scripts/build-kernel $(CHROOT)/root/build-kernel
$(inroot) --setenv=KERNEL=$(KERNEL_PKG) \ $(inroot) --setenv=KERNEL=$(KERNEL_PKG) \
--setenv=EMERGE="$(EMERGE)" \ --setenv=EMERGE="$(EMERGE)" \
--setenv=USEPKG="$(USEPKG)" \ --setenv=USEPKG="$(USEPKG)" \
--setenv=MAKEOPTS="$(MAKEOPTS)" \ --setenv=MAKEOPTS="$(MAKEOPTS)" \
/bin/sh /root/kernel.sh /root/build-kernel
rm -f $(CHROOT)/root/kernel.sh rm -f $(CHROOT)/root/build-kernel
endif endif
touch $(KERNEL) touch $(KERNEL)

124
scripts/build-kernel Executable file
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@ -0,0 +1,124 @@
#!/usr/bin/env python
"""Build the latest kernel but only if need be"""
import os
import shutil
import subprocess
EMERGE = os.environ['EMERGE'].split()
USEPKG = os.environ['USEPKG'].split()
def get_latest_available_kernel():
kernel = os.environ['KERNEL']
package_name = 'sys-kernel/{}'.format(kernel)
popen = subprocess.Popen(
['portageq', 'best_visible', '/', package_name],
stdout=subprocess.PIPE,
)
cpv = popen.stdout.read().decode().strip()
return cpv.rpartition('-')[2]
def get_current_kernel():
"""what kernel does /boot/vmlinuz point to"""
vmlinuz = '/boot/vmlinuz'
if not os.path.islink(vmlinuz):
return None
filename = os.path.basename(os.path.realpath(vmlinuz))
assert filename.startswith('vmlinuz')
part_after_vmlinuz = filename[8:]
# may have "-gentoo" or whatever in the name
version = part_after_vmlinuz.rpartition('-')[0]
return version
def install_kernel_package():
kernel = os.environ['KERNEL']
package_name = 'sys-kernel/{}'.format(kernel)
cmd = EMERGE + USEPKG + ['--oneshot', '--noreplace', package_name]
subprocess.check_call(cmd)
def copy_kernel_config():
filename = '/root/kernel.config'
shutil.copy(filename, '/usr/src/linux/.config')
def build_kernel():
makeopts = os.environ.get('MAKEOPTS', '')
subprocess.check_call([
'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts, 'oldconfig'
])
subprocess.check_call([
'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts
])
def remove_old_kernels():
kernel_files = ['vmlinuz-', 'System.map-', 'config-']
for filename in os.listdir('/boot'):
for kernel_file in kernel_files:
if filename.startswith(kernel_file):
path = os.path.join('/boot', filename)
os.unlink(path)
if os.path.exists('/boot/vmlinuz'):
os.unlink('/boot/vmlinuz')
shutil.rmtree('/lib/modules', ignore_errors=True)
def install_kernel():
makeopts = os.environ.get('MAKEOPTS', '')
subprocess.check_call([
'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts, 'install',
'modules_install'
])
# create the symlink. /sbin/installkernel claims this is not used on
# "modern" distributions and doesn't create it (unless it already
# exists). I still do this however.
for filename in os.listdir('/boot'):
if filename.startswith('vmlinuz-'):
os.symlink(filename, '/boot/vmlinuz')
break
else:
raise Exception('Could not find installed kernel')
def uninstall_kernel_package():
subprocess.check_call([
'make', '-C', '/usr/src/linux', 'distclean'
])
subprocess.check_call(EMERGE + USEPKG + ['--depclean', '--with-bdeps=n'])
def main():
latest_kernel = get_latest_available_kernel()
current_kernel = get_current_kernel()
if current_kernel == latest_kernel:
return
install_kernel_package()
copy_kernel_config()
build_kernel()
remove_old_kernels()
install_kernel()
uninstall_kernel_package()
main()

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@ -1,31 +0,0 @@
set -ev
# (possibly) build the kernel
current_kernel=$(emerge -qp ${KERNEL}|awk '{print $4}'|cut -d/ -f2|sed s/"${KERNEL}-//;s/-r[1-9]\+$//")
echo $current_kernel
# If there is already a kernel in /boot and emerging the kernel only
# re-installs the same kernel, we can skip this
if [ -n "$current_kernel" ] && [ -e /boot/vmlinuz ] && \
readlink /boot/vmlinuz | grep $current_kernel > /dev/null
then
exit
fi
${EMERGE} ${USEPKG} --oneshot --newuse --noreplace sys-kernel/${KERNEL}
cp /root/kernel.config /usr/src/linux/.config
gcc-config 1
cd /usr/src/linux
make ${MAKEOPTS} oldconfig
make ${MAKEOPTS}
rm -rf /lib/modules/*
make ${MAKEOPTS} modules_install
rm -f /boot/vmlinuz*
make ${MAKEOPTS} install
cp -a /usr/src/linux/.config /root/kernel.config
make ${MAKEOPTS} mrproper
cd /boot
k=`/bin/ls -1 vmlinuz-*`
ln -nsf $k vmlinuz
${EMERGE} --depclean