Re: [isar] rootfs: Add new ROOTFS_FEATURE 'slimfy' to minimize the footprint

[Jan Kiszka <jan.kiszka@siemens.com>]

On 06.09.21 11:45, venkata.pyla@toshiba-tsip.com wrote:
> From: venkata pyla <venkata.pyla@toshiba-tsip.com>
> 
>  This Adds new ROOTFS_FEATURE 'slimify' that deletes unnecessary files
>  in the rootfs and contributes to minimal footprint in the rootfs and
>  also avoids the reproducible failures due to non-deterministic data in
>  the log files and temporary files.
> 
>  It deletes the following files
>   - /var/log/*
>   - /tmp/*
> 
>  To enable this feature
>    ROOTFS_FEATURE += slimify
> 
> Signed-off-by: venkata pyla <venkata.pyla@toshiba-tsip.com>
> ---
>  meta/classes/rootfs.bbclass | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
> index f9151c5..d01a9d1 100644
> --- a/meta/classes/rootfs.bbclass
> +++ b/meta/classes/rootfs.bbclass
> @@ -12,6 +12,7 @@ ROOTFS_PACKAGES ?= ""
>  # 'clean-package-cache' - delete package cache from rootfs
>  # 'generate-manifest' - generate a package manifest of the rootfs into ${ROOTFS_MANIFEST_DEPLOY_DIR}
>  # 'export-dpkg-status' - exports /var/lib/dpkg/status file to ${ROOTFS_DPKGSTATUS_DEPLOY_DIR}
> +# 'slimify'            - delete unnecessary files in rootfs like /var/log/*, /tmp/*

/tmp should be emptied unconditionally.

I'm also wondering if we should rather permit to preserving logs for
debugging purposes and make deletion the default as well.

Jan

>  ROOTFS_FEATURES ?= ""
>  
>  ROOTFS_APT_ARGS="install --yes -o Debug::pkgProblemResolver=yes"
> @@ -229,6 +230,12 @@ rootfs_export_dpkg_status() {
>         '${ROOTFS_DPKGSTATUS_DEPLOY_DIR}'/'${PF}'.dpkg_status
>  }
>  
> +ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'slimify', 'rootfs_slimify', '', d)}"
> +rootfs_slimify() {
> +    sudo rm -rf "${ROOTFSDIR}/var/log/"*
> +    sudo rm -rf "${ROOTFSDIR}/tmp/"*
> +}
> +
>  do_rootfs_postprocess[vardeps] = "${ROOTFS_POSTPROCESS_COMMAND}"
>  python do_rootfs_postprocess() {
>      # Take care that its correctly mounted:
> 

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