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
parent
81b7e1cd1b
commit
be9f75a457
8
Makefile
8
Makefile
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@ -155,17 +155,17 @@ $(COMPILE_OPTIONS): $(STAGE3) $(PORTAGE_DIR) configs/make.conf.$(ARCH) configs/l
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done
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touch $(COMPILE_OPTIONS)
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$(KERNEL): $(COMPILE_OPTIONS) $(KERNEL_CONFIG) scripts/kernel.sh
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$(KERNEL): $(COMPILE_OPTIONS) $(KERNEL_CONFIG) scripts/build-kernel
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ifneq ($(EXTERNAL_KERNEL),YES)
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@scripts/echo Configuring kernel
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cp $(KERNEL_CONFIG) $(CHROOT)/root/kernel.config
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cp scripts/kernel.sh $(CHROOT)/root/kernel.sh
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cp scripts/build-kernel $(CHROOT)/root/build-kernel
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$(inroot) --setenv=KERNEL=$(KERNEL_PKG) \
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--setenv=EMERGE="$(EMERGE)" \
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--setenv=USEPKG="$(USEPKG)" \
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--setenv=MAKEOPTS="$(MAKEOPTS)" \
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/bin/sh /root/kernel.sh
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rm -f $(CHROOT)/root/kernel.sh
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/root/build-kernel
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rm -f $(CHROOT)/root/build-kernel
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endif
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touch $(KERNEL)
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@ -0,0 +1,124 @@
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#!/usr/bin/env python
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"""Build the latest kernel but only if need be"""
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import os
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import shutil
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import subprocess
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EMERGE = os.environ['EMERGE'].split()
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USEPKG = os.environ['USEPKG'].split()
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def get_latest_available_kernel():
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kernel = os.environ['KERNEL']
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package_name = 'sys-kernel/{}'.format(kernel)
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popen = subprocess.Popen(
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['portageq', 'best_visible', '/', package_name],
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stdout=subprocess.PIPE,
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)
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cpv = popen.stdout.read().decode().strip()
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return cpv.rpartition('-')[2]
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def get_current_kernel():
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"""what kernel does /boot/vmlinuz point to"""
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vmlinuz = '/boot/vmlinuz'
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if not os.path.islink(vmlinuz):
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return None
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filename = os.path.basename(os.path.realpath(vmlinuz))
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assert filename.startswith('vmlinuz')
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part_after_vmlinuz = filename[8:]
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# may have "-gentoo" or whatever in the name
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version = part_after_vmlinuz.rpartition('-')[0]
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return version
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def install_kernel_package():
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kernel = os.environ['KERNEL']
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package_name = 'sys-kernel/{}'.format(kernel)
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cmd = EMERGE + USEPKG + ['--oneshot', '--noreplace', package_name]
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subprocess.check_call(cmd)
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def copy_kernel_config():
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filename = '/root/kernel.config'
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shutil.copy(filename, '/usr/src/linux/.config')
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def build_kernel():
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makeopts = os.environ.get('MAKEOPTS', '')
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts, 'oldconfig'
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])
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts
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])
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def remove_old_kernels():
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kernel_files = ['vmlinuz-', 'System.map-', 'config-']
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for filename in os.listdir('/boot'):
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for kernel_file in kernel_files:
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if filename.startswith(kernel_file):
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path = os.path.join('/boot', filename)
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os.unlink(path)
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if os.path.exists('/boot/vmlinuz'):
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os.unlink('/boot/vmlinuz')
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shutil.rmtree('/lib/modules', ignore_errors=True)
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def install_kernel():
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makeopts = os.environ.get('MAKEOPTS', '')
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts, 'install',
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'modules_install'
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])
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# create the symlink. /sbin/installkernel claims this is not used on
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# "modern" distributions and doesn't create it (unless it already
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# exists). I still do this however.
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for filename in os.listdir('/boot'):
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if filename.startswith('vmlinuz-'):
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os.symlink(filename, '/boot/vmlinuz')
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break
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else:
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raise Exception('Could not find installed kernel')
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def uninstall_kernel_package():
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'distclean'
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])
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subprocess.check_call(EMERGE + USEPKG + ['--depclean', '--with-bdeps=n'])
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def main():
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latest_kernel = get_latest_available_kernel()
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current_kernel = get_current_kernel()
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if current_kernel == latest_kernel:
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return
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install_kernel_package()
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copy_kernel_config()
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build_kernel()
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remove_old_kernels()
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install_kernel()
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uninstall_kernel_package()
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main()
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@ -1,31 +0,0 @@
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set -ev
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# (possibly) build the kernel
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current_kernel=$(emerge -qp ${KERNEL}|awk '{print $4}'|cut -d/ -f2|sed s/"${KERNEL}-//;s/-r[1-9]\+$//")
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echo $current_kernel
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# If there is already a kernel in /boot and emerging the kernel only
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# re-installs the same kernel, we can skip this
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if [ -n "$current_kernel" ] && [ -e /boot/vmlinuz ] && \
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readlink /boot/vmlinuz | grep $current_kernel > /dev/null
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then
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exit
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fi
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${EMERGE} ${USEPKG} --oneshot --newuse --noreplace sys-kernel/${KERNEL}
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cp /root/kernel.config /usr/src/linux/.config
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gcc-config 1
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cd /usr/src/linux
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make ${MAKEOPTS} oldconfig
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make ${MAKEOPTS}
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rm -rf /lib/modules/*
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make ${MAKEOPTS} modules_install
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rm -f /boot/vmlinuz*
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make ${MAKEOPTS} install
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cp -a /usr/src/linux/.config /root/kernel.config
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make ${MAKEOPTS} mrproper
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cd /boot
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k=`/bin/ls -1 vmlinuz-*`
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ln -nsf $k vmlinuz
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${EMERGE} --depclean
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