]
}
```
+
+## Hacking on the kernel + systemd
+
+If you're hacking on the kernel in tandem with systemd, you can clone a kernel repository in mkosi.kernel/ in
+the systemd repository, and mkosi will automatically build that kernel and install it into the final image.
+To prevent the distribution's kernel from being installed (which isn't necessary since we're building our
+own kernel), you can add the following snippets to mkosi.default.d/20-local.conf:
+
+(This snippet is for Fedora, the list of packages will need to be changed for other distributions)
+
+```
+[Distribution]
+CacheInitrd=no
+
+[Content]
+BasePackages=conditional
+Packages=systemd
+ util-linux
+ dracut
+```
# 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
projects / thirdparty / systemd.git / commitdiff
