Re: [RFC 2/2] rootfs: use host apt when installing in cross mode

[Anton Mikanovich <amikan@ilbers.de>]

20.07.2026 13:52, 'Felix Moessbauer' via isar-users wrote:
> Currently the apt inside the chroot is used to perform the extraction
> and installation. This is really slow on non native architectures (esp.
> on larger packages), as the whole operation is emulated.
>
> We improve this by using the host apt for the dependency resolution,
> unpack and configure operation. The dpkg chroots into the rootfs to run
> the target maintainer scripts (emulated via qemu in cross builds),
> mirroring how mmdebstrap installs. As we already have all packages in
> the apt cache (since e09589d28), we don't need to mount the isar apt or
> base apt - which would not work as the host apt would lookup the
> absolute apt paths on the host (i.e. read /isar-apt from the host
> instead of the chroot).
>
> Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
> ---
>   meta/classes-recipe/rootfs.bbclass | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/meta/classes-recipe/rootfs.bbclass b/meta/classes-recipe/rootfs.bbclass
> index 6af29b40..95210f4c 100644
> --- a/meta/classes-recipe/rootfs.bbclass
> +++ b/meta/classes-recipe/rootfs.bbclass
> @@ -390,9 +390,15 @@ rootfs_install_pkgs_install[network] = "${TASK_USE_SUDO}"
>   rootfs_install_pkgs_install() {
>       run_privileged_heredoc <<'EOF'
>       set -e
> +    # Unpack and configure packages using the host apt. Dependency resolution
> +    # and the apt frontend run natively (-o Dir points at the rootfs), while
> +    # dpkg chroots into the rootfs to run the target maintainer scripts
> +    # (emulated via qemu in cross builds), mirroring how mmdebstrap installs.
>       ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), d.getVar('ROOTFS_MOUNTS')) if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''}
> -    chroot "${ROOTFSDIR}" \
> -        /usr/bin/apt-get ${ROOTFS_APT_ARGS} --no-download ${ROOTFS_PACKAGES}
> +    /usr/bin/apt-get -o APT::Architecture=${ROOTFS_ARCH} \
> +        -o Dir="${ROOTFSDIR}" \
> +        -o DPkg::Chroot-Directory="${ROOTFSDIR}" \
> +        ${ROOTFS_APT_ARGS} --no-download ${ROOTFS_PACKAGES}
I think we can drop full binary path here and just let the host OS use its
PATH value.
>   EOF
>   }
>   

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