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Latest mkosi sets $MKOSI_UID and $MKOSI_GID to the uid/gid of the
user running mkosi. Let's make use of this to run meson setup and
ninja as the user running mkosi, so that if we execute git as a
subprocess during meson setup, it doesn't complain about unsafe
directories. This also makes sure all the build artifacts are owned
on the host by the user running mkosi.
mkosi now supports booting directory images in qemu using virtiofs.
However, until distribution kernels build the virtiofs driver directly
into the kernel, we need an initrd to make this work, so make sure to
pull in the initrd preset when building a directory image that could be
bootable to make this work.
Let's not build all presets by default, but only the system preset.
Also, let's only make the system preset depend on the initrd preset
if we're building a bootable disk image. This means that if we build
the system image as a cpio, uki or directory, the initrd preset will
be skipped as it's not necessary, making the build a little faster.
The kernel has this horrible build system feature where distros
can ship /sbin/installkernel and it'll automatically be used by
make install. Let's make sure that doesn't happen as on Debian this
script puts the kernel under the wrong name causing mkosi build
failures.
Configuration now takes priority over CLI options so we have to
configure the defaults for settings that we want to allow overriding
from the CLI. We also explicitly set some other settings so that they
can't be overridden from the CLI anymore. For example the base and
initrd image should never be made bootable so we set Bootable=no
explicitly for both.
Also, there is no need to conditionalize the get_variable() calls
because not-found dependencies will just return the passed default value
if provided.
This uses a two-step approach to make sure we can fall back to
find_library(), while also skipping the detection if the features are
explicitly disabled.
By making this a disabler dependency, we can slightly simplify the code
and it als fixes the build for -Dfdisk=disabled as we failed to create a
fallback empty libshared_fdisk variable.
By using meson features we can replace the handcrafted dependency
auto-detection by just passing the value from get_option directly to the
required arg for dependency, find_library etc.
'auto' features make the dependency optional, 'enabled' requires it
while 'disabled' features will skip detection entirely.
Any skipped or not found dependency will just be a no-op when passed to
build steps and therefore we can also skip the creation of empty vars.
The use of skip_deps for these is dropped here as meson provides a way
to disable all optional features in one go by passing
'-Dauto_features=disabled'.
Originally, the source code was copied under /root/src.
This home directory is part of root FS and the new mkosi building
paradigm has only ephemeral root FS that is generated lazily.
Any files placed on the root FS in the build environment are that
excluded from the final image.
It is useful to have source codes available in the image's runtime (not
build time) environment for debugging.
ExtraTrees= as used currently are ineffective, so change the destination
to copy files under /usr to achieve the intention.
gdb sees source files as:
> 1354 ../src/src/systemctl/systemctl.c: No such file or directory.
Modify gdb configration in the built image accordingly (that file cannot
be in /root neither) to resolve to the moved sources.
(Commit fdecbf7 ("Enable unprivileged image builds") envisions bind
mounting or virtiofsd for nspawn or qemu containers respectively.)
This update introduces the explicit Dependencies= setting, instead
of relying on implicit dependencies via alphanumerical ordering.
We also take the opportunity to rename the "final" preset to the
"system" preset, which seems like a better name.
Currently, we install the systemd install tree in the base image and
then build the initrd and final images from the base image. This means
if that any systemd package is pulled in during the initrd or final
image builds, it will override our version.
To fix this, we stop installing our build of systemd in the base image,
and store it in the output directory instead. That allows us to refer to
it using ExtraTrees= in the final and initrd image builds to install it
after all the distro packages have been installed, ensuring our version
always takes priority.
Workaround for CI issue, the sd-stub we build is overwritten in the final
image as the package gets pulled there, install it in the base to
work around it for now
vsock should work properly after the latest release of mkosi. But
to make sure it works, let's exit with 123 in case of success and
check for that in Github Actions.
We only really care about lowering the device timeout so we get to
a shell faster when the root device doesn't appear so let's only
lower that timeout instead of lowering all default timeouts.
