imageboot falls back to cp when unsquashfs is unavailable, but the build
side did not: a bare dracut_install/copy_exec aborts initramfs generation
when the binary is absent, and the capture prerequisite check refused to
capture the image at all.
Mark the initramfs copies optional and report the missing package as an
advisory rather than a hard prerequisite, so such images still build and
capture, just without the faster extraction path. Widen the EL check to
every release past el8 so future ones inherit it.
`unsquashfs` can use multiple CPU cores during image extraction, significantly reducing boot time.
For example the whole boot time from PXE to shell on a 8-core VM, from approximately 45 seconds to 20 seconds.
This PR adds `squashfs-tools` as a dependency. Since the package is smaller than 1 MB, the additional image size is justified by the performance improvement.
For backward compatibility, the existing `cp`-based extraction method is used when `unsquashfs` is unavailable, such as with images built before this change.
The extraction logic has also been moved into the common functions and is now shared between EL9, EL10, and Ubuntu.
Both untethered `squashfs` images and `confluent_multisquash` images are supported.
Images must be rebuilt to include `unsquashfs` and benefit from the faster extraction path.
Allow building EL and Ubuntu diskless images for a foreign architecture (e.g.
aarch64 on an x86_64 host) by leveraging qemu-user-static. The target
architecture is detected automatically from a -s source tree (for EL),
or may be requested explicitly with the new --arch option.
When the target differs from the host, dnf/debootstrap is invoked with
--forcearch/--arch and the presence of an enabled binfmt_misc handler
with the F (fix-binary) flag is verified up front, so emulation keeps working
inside the installroot chroot and a missing setup yields an actionable
error instead of a confusing exec failure mid-build.
The image architecture is recorded in confluentimg.buildinfo so that
pack selects the initramfs addons for the image architecture rather
than the build host, and exec of a foreign-arch root performs the same
binfmt check.
Copy Debian apt sources and keyrings into the target before apt runs. Run apt with DEBIAN_FRONTEND=noninteractive.
Return constrained child status to callers, and make pack fail clearly when no kernel was installed.
To handle amd64/arm64 profiles, have the pkglist allow for architecture specific qualifiers.
Additionally, soften failure to accomplish selinux changes.
The r8169 enjoys some popularity.
Also, we'd like to be able to try out diskless/cloning with
VMs, so vmxnet3 and virtio_net are handy to round that out.
Utilities that expected /dev/pts will now be satisfied,
as a new /dev/pts is mounted.
Further, systemd added a check in various utilities that
was fouled by the previous method of appearing to have a
root filesystem.
Before, after chroot, we would bind mount / to itself, and this
made things using /proc/mounts, /proc/self/mountinfo, df, mount,
etc happy that there is a real looking root filesystem.
However, by doing it after the chroot, systemd could statx on '..' and
get a different mnt id than /. So it had to be done prior to the
chroot. However it also had to be done before other mounts as
bind mounting over it would block the submounts.
This more closely imitates the initramfs behavior, where '/' starts life
as a 'real' filesystem before being mounted up and switched into.
This behavior was made to imitate the 'start_root.c' behavior as that
seems to be more broadly successful.
Markus Hilger
Jarrod Johnson
Jarrod Johnson
Vinícius Ferrão