Re: [PATCH] image.bbclass: fix non-reproducible file time-stamps inside rootfs image

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

On 02.01.23 15:58, venkata.pyla@toshiba-tsip.com wrote:
> From: venkata pyla <venkata.pyla@toshiba-tsip.com>
> 
> As part of reproducible-build work, the rootfs images generated on same
> source should be identical between two builds.
> 
> In this commit it tries to solve one of the non-reproducible problem
> i.e. the rootfs file time-stamps generated during build time are not
> reproducible, it uses one of the solution provided in the debian
> live-build image project (refer [1]), it fixes by finding all the
> files/folders that are gernerated newly and set the time-stamp provided
> by `SOURCE_DATE_EPOCH` environment variable.
> 
> [1] https://salsa.debian.org/live-team/live-build/-/merge_requests/218
> 

Just out of curiosity: How does Yocto address this?

Jan

> Signed-off-by: venkata pyla <venkata.pyla@toshiba-tsip.com>
> ---
>  meta/classes/image.bbclass | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
> index 813e1f3..f592a12 100644
> --- a/meta/classes/image.bbclass
> +++ b/meta/classes/image.bbclass
> @@ -430,6 +430,15 @@ do_rootfs_finalize() {
>              "${ROOTFSDIR}/etc/apt/sources.list.d/bootstrap.list"
>  
>          rm -f "${ROOTFSDIR}/etc/apt/sources-list"
> +
> +        # Set same time-stamps to the newly generated file/folders in the
> +        # rootfs image for the purpose of reproducible builds.
> +        test ! -z "${SOURCE_DATE_EPOCH}" && \
> +            find ${ROOTFSDIR} -newermt \
> +                "$(date -d@${SOURCE_DATE_EPOCH} '+%Y-%m-%d %H:%M:%S')" \
> +                -printf "%y %p\n" \
> +                -exec touch '{}' -h -d@${SOURCE_DATE_EPOCH} ';'
> +
>  EOSUDO
>  }
>  addtask rootfs_finalize before do_rootfs after do_rootfs_postprocess

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