forked from Mirror/pmbootstrap
6502d8aa28
Add support for packaging a kernel that was compiled outside of envkernel. The envkernel.sh wrapper is great for someone new to kernel development, but it makes it difficult to do things like "make dt_binding_check". This lets you avoid the wrapper and build on your host machine but still use pmbootstrap to package your kernel for easier testing.
236 lines
8.9 KiB
Python
236 lines
8.9 KiB
Python
# Copyright 2022 Robert Yang
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# SPDX-License-Identifier: GPL-3.0-or-later
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import logging
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import os
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import re
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import pmb.aportgen
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import pmb.build
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import pmb.chroot
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import pmb.helpers
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import pmb.helpers.pmaports
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import pmb.parse
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def match_kbuild_out(word):
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"""
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Look for paths in the following formats:
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"<prefix>/<kbuild_out>/arch/<arch>/boot"
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"<prefix>/<kbuild_out>/include/config/kernel.release"
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:param word: space separated string cut out from a line from an APKBUILD
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function body that might be the kbuild output path
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:returns: kernel build output directory.
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empty string when a separate build output directory isn't used.
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None, when no output directory is found.
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"""
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prefix = "^\\\"?\\$({?builddir}?|{?srcdir}?)\\\"?/"
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kbuild_out = "(.*\\/)*"
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postfix = "(arch\\/.*\\/boot.*)\\\"?$"
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match = re.match(prefix + kbuild_out + postfix, word)
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if match is None:
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postfix = "(include\\/config\\/kernel\\.release)\\\"?$"
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match = re.match(prefix + kbuild_out + postfix, word)
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if match is None:
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return None
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groups = match.groups()
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if groups is None or len(groups) != 3:
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return None
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logging.debug("word = " + str(word))
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logging.debug("regex match groups = " + str(groups))
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out_dir = groups[1]
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return "" if out_dir is None else out_dir.strip("/")
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def find_kbuild_output_dir(function_body):
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"""
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Guess what the kernel build output directory is. Parses each line of the
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function word by word, looking for paths which contain the kbuild output
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directory.
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:param function_body: contents of a function from the kernel APKBUILD
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:returns: kbuild output dir
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None, when output dir is not found
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"""
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guesses = []
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for line in function_body:
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for item in line.split():
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kbuild_out = match_kbuild_out(item)
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if kbuild_out is not None:
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guesses.append(kbuild_out)
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break
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# Check if guesses are all the same
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it = iter(guesses)
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first = next(it, None)
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if first is None:
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raise RuntimeError("Couldn't find a kbuild out directory. Is your "
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"APKBUILD messed up? If not, then consider "
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"adjusting the patterns in pmb/build/envkernel.py "
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"to work with your APKBUILD, or submit an issue.")
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if all(first == rest for rest in it):
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return first
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raise RuntimeError("Multiple kbuild out directories found. Can you modify "
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"your APKBUILD so it only has one output path? If you "
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"can't resolve it, please open an issue.")
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def modify_apkbuild(args, pkgname, aport):
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"""
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Modify kernel APKBUILD to package build output from envkernel.sh
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"""
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apkbuild_path = aport + "/APKBUILD"
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apkbuild = pmb.parse.apkbuild(apkbuild_path)
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if os.path.exists(args.work + "/aportgen"):
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pmb.helpers.run.user(args, ["rm", "-r", args.work + "/aportgen"])
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pmb.helpers.run.user(args, ["mkdir", args.work + "/aportgen"])
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pmb.helpers.run.user(args, ["cp", "-r", apkbuild_path,
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args.work + "/aportgen"])
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pkgver = pmb.build._package.get_pkgver(apkbuild["pkgver"],
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original_source=False)
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fields = {"pkgver": pkgver,
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"pkgrel": "0",
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"subpackages": "",
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"builddir": "/home/pmos/build/src"}
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pmb.aportgen.core.rewrite(args, pkgname, apkbuild_path, fields=fields)
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def host_build_bindmount(args, chroot, flag_file, mount=False):
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"""
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Check if the bind mount already exists and unmount it.
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Then bindmount the current directory into the chroot as
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/mnt/linux so it can be used by the envkernel abuild wrapper
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"""
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flag_path = f"{chroot}/{flag_file}"
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if os.path.exists(flag_path):
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logging.info("Cleaning up kernel sources bind-mount")
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pmb.helpers.run.root(args, ["umount", chroot + "/mnt/linux"], check=False)
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pmb.helpers.run.root(args, ["rm", flag_path])
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if mount:
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pmb.helpers.mount.bind(args, ".", f"{chroot}/mnt/linux")
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pmb.helpers.run.root(args, ["touch", flag_path])
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def run_abuild(args, pkgname, arch, apkbuild_path, kbuild_out):
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"""
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Prepare build environment and run abuild.
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:param pkgname: package name of a linux kernel aport
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:param arch: architecture for the kernel
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:param apkbuild_path: path to APKBUILD of the kernel aport
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:param kbuild_out: kernel build system output sub-directory
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"""
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chroot = args.work + "/chroot_native"
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build_path = "/home/pmos/build"
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kbuild_out_source = "/mnt/linux/.output"
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# If the kernel was cross-compiled on the host rather than with the envkernel
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# helper, we can still use the envkernel logic to package the artifacts for
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# development, making it easy to quickly sideload a new kernel or pmbootstrap
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# to create a boot image
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# This handles bind mounting the current directory (assumed to be kernel sources)
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# into the chroot so we can run abuild against it for the currently selected
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# devices kernel package.
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flag_file = "envkernel-bind-mounted"
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host_build = False
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if not os.path.ismount(chroot + "/mnt/linux"):
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logging.info("envkernel.sh hasn't run, assuming the kernel was cross compiled"
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"on host and using current dir as source")
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host_build = True
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host_build_bindmount(args, chroot, flag_file, mount=host_build)
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if not os.path.exists(chroot + kbuild_out_source):
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raise RuntimeError("No '.output' dir found in your kernel source dir. "
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"Compile the " + args.device + " kernel first and "
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"then try again. See https://postmarketos.org/envkernel"
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"for details. If building on your host and only using "
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"--envkernel for packaging, make sure you have O=.output "
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"as an argument to make.")
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# Create working directory for abuild
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pmb.build.copy_to_buildpath(args, pkgname)
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# Create symlink from abuild working directory to envkernel build directory
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build_output = "" if kbuild_out == "" else "/" + kbuild_out
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if build_output != "":
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if os.path.islink(chroot + "/mnt/linux/" + build_output) and \
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os.path.lexists(chroot + "/mnt/linux/" + build_output):
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pmb.chroot.root(args, ["rm", "/mnt/linux/" + build_output])
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pmb.chroot.root(args, ["ln", "-s", "/mnt/linux",
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build_path + "/src"])
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pmb.chroot.root(args, ["ln", "-s", kbuild_out_source,
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build_path + "/src" + build_output])
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cmd = ["cp", apkbuild_path, chroot + build_path + "/APKBUILD"]
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pmb.helpers.run.root(args, cmd)
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# Create the apk package
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env = {"CARCH": arch,
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"CHOST": arch,
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"CBUILD": pmb.config.arch_native,
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"SUDO_APK": "abuild-apk --no-progress"}
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cmd = ["abuild", "rootpkg"]
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pmb.chroot.user(args, cmd, working_dir=build_path, env=env)
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# Clean up bindmount if needed
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host_build_bindmount(args, chroot, flag_file)
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# Clean up symlinks
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if build_output != "":
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if os.path.islink(chroot + "/mnt/linux/" + build_output) and \
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os.path.lexists(chroot + "/mnt/linux/" + build_output):
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pmb.chroot.root(args, ["rm", "/mnt/linux/" + build_output])
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pmb.chroot.root(args, ["rm", build_path + "/src"])
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def package_kernel(args):
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"""
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Frontend for 'pmbootstrap build --envkernel': creates a package from
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envkernel output.
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"""
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pkgname = args.packages[0]
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if len(args.packages) > 1 or not pkgname.startswith("linux-"):
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raise RuntimeError("--envkernel needs exactly one linux-* package as "
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"argument.")
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aport = pmb.helpers.pmaports.find(args, pkgname)
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modify_apkbuild(args, pkgname, aport)
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apkbuild_path = args.work + "/aportgen/APKBUILD"
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arch = args.deviceinfo["arch"]
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apkbuild = pmb.parse.apkbuild(apkbuild_path, check_pkgname=False)
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if apkbuild["_outdir"]:
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kbuild_out = apkbuild["_outdir"]
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else:
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function_body = pmb.parse.function_body(aport + "/APKBUILD", "package")
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kbuild_out = find_kbuild_output_dir(function_body)
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suffix = pmb.build.autodetect.suffix(apkbuild, arch)
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# Install package dependencies
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depends, _ = pmb.build._package.build_depends(
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args, apkbuild, pmb.config.arch_native, strict=False)
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pmb.build.init(args, suffix)
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if pmb.parse.arch.cpu_emulation_required(arch):
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depends.append("binutils-" + arch)
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pmb.chroot.apk.install(args, depends, suffix)
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output = (arch + "/" + apkbuild["pkgname"] + "-" + apkbuild["pkgver"] +
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"-r" + apkbuild["pkgrel"] + ".apk")
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message = "(" + suffix + ") build " + output
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logging.info(message)
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run_abuild(args, pkgname, arch, apkbuild_path, kbuild_out)
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pmb.build.other.index_repo(args, arch)
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