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systemd/mkosi.build
Daan De Meyer d12e9bdc76 mkosi: Optionally build a kernel image from mkosi.kernel/ 
If mkosi.kernel/ exists, the mkosi script will try to build a kernel
image from it. We use the architecture defconfig as a base and add
our own extra configuration on top.

We also add some extra tooling to the build image required to build
the kernel and include some documentation in HACKING.md on how to
use this new feature.

To avoid the kernel sources from being copied into the build or
final image (which we don't want because it takes a while), we put
the mkosi.kernel/ directory in .gitignore and use
"SourceFileTransfer=mount" so that the sources are still accessible
in the build image.
2022-09-29 20:15:57 +02:00

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#!/bin/sh
# SPDX-License-Identifier: LGPL-2.1-or-later
set -e
# This is a build script for OS image generation using mkosi (https://github.com/systemd/mkosi).
# Simply invoke "mkosi" in the project directory to build an OS image.
ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1:disable_coredump=0:use_madv_dontdump=1
UBSAN_OPTIONS=print_stacktrace=1:print_summary=1:halt_on_error=1
# On Fedora "ld" is (unfortunately — if you ask me) managed via
# "alternatives". Since we'd like to support building images in environments
# with only /usr/ around (e.g. mkosi's UsrOnly=1 option), we have the problem
# that /usr/bin/ld is a symlink that points to a non-existing file in
# /etc/alternative/ in this mode. Let's work around this for now by manually
# redirect "ld" to "ld.bfd", i.e. circumventing the /usr/bin/ld symlink.
if [ ! -x /usr/bin/ld ] && [ -x /usr/bin/ld.bfd ]; then
mkdir -p "$HOME"/bin
ln -s /usr/bin/ld.bfd "$HOME"/bin/ld
PATH="$HOME/bin:$PATH"
fi
# If mkosi.builddir/ exists mkosi will set $BUILDDIR to it, let's then use it
# as out-of-tree build dir. Otherwise, let's make up our own builddir.
[ -z "$BUILDDIR" ] && BUILDDIR=build
# Meson uses Python 3 and requires a locale with an UTF-8 character map.
# Not running under UTF-8 makes the `ninja test` step break with a CodecError.
# So let's ensure we're running under UTF-8.
#
# If our current locale already is UTF-8, then we don't need to do anything:
if [ "$(locale charmap 2>/dev/null)" != "UTF-8" ] ; then
# Try using C.UTF-8 locale, if available. This locale is not shipped
# by upstream glibc, so it's not available in all distros.
# (In particular, it's not available in Arch Linux.)
if locale -a | grep -q -E "C.UTF-8|C.utf8"; then
export LC_CTYPE=C.UTF-8
# Finally, try something like en_US.UTF-8, which should be
# available in Arch Linux, but is not present in Debian's
# minimal image in our mkosi config.
elif locale -a | grep -q en_US.utf8; then
export LC_CTYPE=en_US.UTF-8
else
# If nothing works, fail early.
echo "*** Could not find a valid locale that supports UTF-8. ***" >&2
exit 1
fi
fi
# The bpftool script shipped by Ubuntu tries to find the actual program to run via querying `uname -r` and
# using the current kernel version. This obviously doesn't work in containers. As a workaround, we override
# the ubuntu script with a symlink to the first bpftool program we can find.
for bpftool in /usr/lib/linux-tools/*/bpftool; do
[ -x "$bpftool" ] || continue
ln -sf "$bpftool" /usr/sbin/bpftool
break
done
if [ ! -f "$BUILDDIR"/build.ninja ] ; then
sysvinit_path=$(realpath /etc/init.d)
init_path=$(realpath /sbin/init 2>/dev/null)
if [ -z "$init_path" ] ; then
rootprefix=""
else
rootprefix=${init_path%/lib/systemd/systemd}
rootprefix=/${rootprefix#/}
fi
meson "$BUILDDIR" \
-D "sysvinit-path=$sysvinit_path" \
-D "rootprefix=$rootprefix" \
-D man=false \
-D translations=false \
-D version-tag="${VERSION_TAG}" \
-D mode=developer \
-D b_sanitize="${SANITIZERS:-none}" \
-D install-tests=true \
-D tests=unsafe \
-D slow-tests=true \
-D utmp=true \
-D hibernate=true \
-D ldconfig=true \
-D resolve=true \
-D efi=true \
-D tpm=true \
-D environment-d=true \
-D binfmt=true \
-D repart=true \
-D sysupdate=true \
-D coredump=true \
-D pstore=true \
-D oomd=true \
-D logind=true \
-D hostnamed=true \
-D localed=true \
-D machined=true \
-D portabled=true \
-D sysext=true \
-D userdb=true \
-D homed=true \
-D networkd=true \
-D timedated=true \
-D timesyncd=true \
-D remote=true \
-D nss-myhostname=true \
-D nss-mymachines=true \
-D nss-resolve=true \
-D nss-systemd=true \
-D firstboot=true \
-D randomseed=true \
-D backlight=true \
-D vconsole=true \
-D quotacheck=true \
-D sysusers=true \
-D tmpfiles=true \
-D importd=true \
-D hwdb=true \
-D rfkill=true \
-D xdg-autostart=true \
-D translations=true \
-D polkit=true \
-D acl=true \
-D audit=true \
-D blkid=true \
-D fdisk=true \
-D kmod=true \
-D pam=true \
-D pwquality=true \
-D microhttpd=true \
-D libcryptsetup=true \
-D libcurl=true \
-D idn=true \
-D libidn2=true \
-D qrencode=true \
-D gcrypt=true \
-D gnutls=true \
-D openssl=true \
-D cryptolib=openssl \
-D p11kit=true \
-D libfido2=true \
-D tpm2=true \
-D elfutils=true \
-D zstd=true \
-D xkbcommon=true \
-D pcre2=true \
-D glib=true \
-D dbus=true \
-D gnu-efi=true \
-D kernel-install=true \
-D analyze=true \
-D bpf-framework=true
fi
cd "$BUILDDIR"
ninja "$@"
if [ "$WITH_TESTS" = 1 ] ; then
for id in 1 2 3; do
getent group $id >/dev/null || echo "g testgroup$id $id -" | ./systemd-sysusers -
done
if [ -n "$SANITIZERS" ]; then
export ASAN_OPTIONS="$ASAN_OPTIONS"
export UBSAN_OPTIONS="$UBSAN_OPTIONS"
TIMEOUT_MULTIPLIER=3
else
TIMEOUT_MULTIPLIER=1
fi
meson test --print-errorlogs --timeout-multiplier=$TIMEOUT_MULTIPLIER
fi
cd "$SRCDIR"
# Ubuntu Focal is stuck with meson 0.53.0.
if [ "$(meson -v | cut -d . -f 2)" -gt 53 ] ; then
meson install -C "$BUILDDIR" --quiet --no-rebuild --only-changed
else
meson install -C "$BUILDDIR" --no-rebuild --only-changed
fi
mkdir -p "$DESTDIR"/etc
cat >"$DESTDIR"/etc/issue <<EOF
\S (built from systemd tree)
Kernel \r on an \m (\l)
EOF
if [ -n "$IMAGE_ID" ] ; then
mkdir -p "$DESTDIR"/usr/lib
sed -n \
-e '/^IMAGE_ID=/!p' \
-e "\$aIMAGE_ID=$IMAGE_ID" <"/usr/lib/os-release" >"${DESTDIR}/usr/lib/os-release"
OSRELEASEFILE="$DESTDIR"/usr/lib/os-release
else
OSRELEASEFILE=/usr/lib/os-release
fi
if [ -n "$IMAGE_VERSION" ] ; then
mkdir -p "$DESTDIR"/usr/lib
sed -n \
-e '/^IMAGE_VERSION=/!p' \
-e "\$aIMAGE_VERSION=$IMAGE_VERSION" <$OSRELEASEFILE >"/tmp/os-release.tmp"
cat /tmp/os-release.tmp > "$DESTDIR"/usr/lib/os-release
rm /tmp/os-release.tmp
fi
# If $CI_BUILD is set, copy over the CI service which executes a service check
# after boot and then shuts down the machine
if [ -n "$CI_BUILD" ]; then
mkdir -p "$DESTDIR/usr/lib/systemd/system"
cp -v "$SRCDIR/test/mkosi-check-and-shutdown.service" "$DESTDIR/usr/lib/systemd/system/mkosi-check-and-shutdown.service"
cp -v "$SRCDIR/test/mkosi-check-and-shutdown.sh" "$DESTDIR/usr/lib/systemd/mkosi-check-and-shutdown.sh"
chmod +x "$DESTDIR/usr/lib/systemd/mkosi-check-and-shutdown.sh"
fi
if [ -n "$SANITIZERS" ]; then
LD_PRELOAD=$(ldd $BUILDDIR/systemd | grep libasan.so | awk '{print $3}')
mkdir -p "$DESTDIR/etc/systemd/system.conf.d"
cat > "$DESTDIR/etc/systemd/system.conf.d/10-asan.conf" <<EOF
[Manager]
ManagerEnvironment=ASAN_OPTIONS=$ASAN_OPTIONS\\
UBSAN_OPTIONS=$UBSAN_OPTIONS\\
LD_PRELOAD=$LD_PRELOAD
DefaultEnvironment=ASAN_OPTIONS=$ASAN_OPTIONS\\
UBSAN_OPTIONS=$UBSAN_OPTIONS\\
LD_PRELOAD=$LD_PRELOAD
EOF
# ASAN logs to stderr by default. However, journald's stderr is connected to /dev/null, so we lose
# all the ASAN logs. To rectify that, let's connect journald's stdout to the console so that any
# sanitizer failures appear directly on the user's console.
mkdir -p "$DESTDIR/etc/systemd/system/systemd-journald.service.d"
cat > "$DESTDIR/etc/systemd/system/systemd-journald.service.d/10-stdout-tty.conf" <<EOF
[Service]
StandardOutput=tty
EOF
# Both systemd and util-linux's login call vhangup() on /dev/console which disconnects all users.
# This means systemd-journald can't log to /dev/console even if we configure `StandardOutput=tty`. As
# a workaround, we modify console-getty.service to disable systemd's vhangup() and disallow login
# from calling vhangup() so that journald's ASAN logs correctly end up in the console.
mkdir -p "$DESTDIR/etc/systemd/system/console-getty.service.d"
cat > "$DESTDIR/etc/systemd/system/console-getty.service.d/10-no-vhangup.conf" <<EOF
[Service]
TTYVHangup=no
CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG
EOF
fi
# Make sure services aren't enabled by default on Debian/Ubuntu.
mkdir -p "$DESTDIR/etc/systemd/system-preset"
echo "disable *" > "$DESTDIR/etc/systemd/system-preset/99-mkosi.preset"
if [ -d mkosi.kernel/ ]; then
cd "$SRCDIR/mkosi.kernel"
mkdir -p "$BUILDDIR/mkosi.kernel"
make O="$BUILDDIR/mkosi.kernel" defconfig
scripts/config \
--file $BUILDDIR/mkosi.kernel/.config \
--enable BPF_SYSCALL \
--enable BPF_JIT \
--enable BPF_JIT_ALWAYS_ON \
--enable BPF_JIT_DEFAULT_ON \
--enable BPF_UNPRIV_DEFAULT_OFF \
--enable USERMODE_DRIVER \
--enable BPF_PRELOAD \
--enable BPF_PRELOAD_UMD \
--enable BPF_LSM \
--enable BTRFS_FS \
--enable BTRFS_FS_POSIX_ACL \
--enable PSI \
--enable CGROUPS \
--enable CGROUP_BPF \
--enable MEMCG \
--enable MEMCG_SWAP \
--enable MEMCG_KMEM
# Make sure all unset options are set to their default value.
make O="$BUILDDIR/mkosi.kernel" olddefconfig
make O="$BUILDDIR/mkosi.kernel" -j "$(nproc)"
KERNEL_RELEASE="$(make O=$BUILDDIR/mkosi.kernel -s kernelrelease)"
mkdir -p "$DESTDIR/usr/lib/modules/$KERNEL_RELEASE"
make O="$BUILDDIR/mkosi.kernel" INSTALL_MOD_PATH="$DESTDIR/usr" modules_install
make O="$BUILDDIR/mkosi.kernel" INSTALL_PATH="$DESTDIR/usr/lib/modules/$KERNEL_RELEASE" install
fi
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