Re: [PATCH 08/11] ci: pytest: Generate test data for dm-verity

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 18.09.25 09:43, Tobias Waldekranz wrote:
> Create a small FAT fs with a couple of files, and the corresponding
> hash tree. Then create a modified copy that we can use to make sure
> that errors are detected.
> 
> Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
>  scripts/generate_testfs.sh | 44 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/scripts/generate_testfs.sh b/scripts/generate_testfs.sh
> index 3c200bd401..1c358ff846 100755
> --- a/scripts/generate_testfs.sh
> +++ b/scripts/generate_testfs.sh
> @@ -28,3 +28,47 @@ generate_fit()
>  	       ${KBUILD_OUTPUT}/testfs/barebox-gzipped.fit
>  }
>  [ -f .github/testfs/${KBUILD_DEFCONFIG}-gzipped.its ] && generate_fit
> +
> +alias pad128k="dd if=/dev/zero bs=128k count=1 status=none"
> +
> +generate_dm_verity()
> +{
> +    work=$(mktemp -d)
> +    cd ${work}
> +
> +    # Create two dummy files; use lots of padding to make sure that
> +    # when we alter the contents of 'english' in root-bad, 'latin' is
> +    # still be readable, as their contents wont (a) share the same
> +    # hash block and (b) the block cache layer won't accedentally read
> +    # the invalid block.
> +
> +    pad128k  >latin
> +    echo -n "veritas vos liberabit" >>latin
> +    pad128k >>latin
> +
> +    pad128k  >english
> +    echo -n "truth will set you free" >>english
> +    pad128k >>english
> +
> +    truncate -s 1M good.fat
> +    mkfs.vfat good.fat
> +    mcopy -i good.fat latin english ::
> +
> +    veritysetup format \
> +		--root-hash-file=good.hash \
> +		good.fat good.verity
> +
> +    sed 's/truth will set you free/LIAR LIAR PANTS ON FIRE/' \
> +	<good.fat >bad.fat
> +
> +    cd -
> +    cp \
> +	${work}/good.fat \
> +	${work}/good.verity \
> +	${work}/good.hash \
> +	${work}/bad.fat \
> +	${KBUILD_OUTPUT}/testfs
> +
> +    rm -rf ${work}
> +}
> +generate_dm_verity


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