Hello Lukas,
On 14/11/2023 09:13:32+0100, Lukas Funke wrote:
> From: Malte Schmidt <[email protected]>
>
> Adds features to explicitly write zeros to the start of the
> partition. This is useful to overwrite old content like
> filesystem signatures which may be re-recognized otherwise.
>
> The new features can be enabled with
> '--soucreparams="[fill|size=<N>[S|s|K|k|M|G]][,][bs=<N>[S|s|K|k|M|G]]"'
> Conflicting or missing options throw errors.
>
> The features are:
> - fill
> Fill the entire partition with zeros. Requires '--fixed-size' option
> to be set.
> - size=<N>[S|s|K|k|M|G]
> Set the first N bytes of the partition to zero. Default unit is 'K'.
> - bs=<N>[S|s|K|k|M|G]
> Write at most N bytes at a time during source file creation.
> Defaults to '1M'. Default unit is 'K'.
>
> Signed-off-by: Malte Schmidt <[email protected]>
We need your SoB here
> ---
> scripts/lib/wic/plugins/source/empty.py | 57 ++++++++++++++++++++++++-
> 1 file changed, 56 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/lib/wic/plugins/source/empty.py
> b/scripts/lib/wic/plugins/source/empty.py
> index 041617d648..f7581a0298 100644
> --- a/scripts/lib/wic/plugins/source/empty.py
> +++ b/scripts/lib/wic/plugins/source/empty.py
> @@ -7,9 +7,19 @@
> # To use it you must pass "empty" as argument for the "--source" parameter in
> # the wks file. For example:
> # part foo --source empty --ondisk sda --size="1024" --align 1024
> +#
> +# The plugin supports writing zeros to the start of the
> +# partition. This is useful to overwrite old content like
> +# filesystem signatures which may be re-recognized otherwise.
> +# This feature can be enabled with
> +# '--soucreparams="[fill|size=<N>[S|s|K|k|M|G]][,][bs=<N>[S|s|K|k|M|G]]"'
> +# Conflicting or missing options throw errors.
>
> import logging
> +import os
>
> +from wic import WicError
> +from wic.ksparser import sizetype
> from wic.pluginbase import SourcePlugin
>
> logger = logging.getLogger('wic')
> @@ -17,6 +27,16 @@ logger = logging.getLogger('wic')
> class EmptyPartitionPlugin(SourcePlugin):
> """
> Populate unformatted empty partition.
> +
> + The following sourceparams are supported:
> + - fill
> + Fill the entire partition with zeros. Requires '--fixed-size' option
> + to be set.
> + - size=<N>[S|s|K|k|M|G]
> + Set the first N bytes of the partition to zero. Default unit is 'K'.
> + - bs=<N>[S|s|K|k|M|G]
> + Write at most N bytes at a time during source file creation.
> + Defaults to '1M'. Default unit is 'K'.
> """
>
> name = 'empty'
> @@ -29,4 +49,39 @@ class EmptyPartitionPlugin(SourcePlugin):
> Called to do the actual content population for a partition i.e. it
> 'prepares' the partition to be incorporated into the image.
> """
> - return
> + get_byte_count = sizetype('K', True)
> + size = 0
> +
> + if 'fill' in source_params and 'size' in source_params:
> + raise WicError("Conflicting source parameters 'fill' and 'size'
> specified, exiting.")
> +
> + # Set the size of the zeros to be written to the partition
> + if 'fill' in source_params:
> + if part.fixed_size == 0:
> + raise WicError("Source parameter 'fill' only works with the
> '--fixed-size' option, exiting.")
> + size = part.fixed_size
> + elif 'size' in source_params:
> + size = get_byte_count(source_params['size'])
> +
> + if size == 0:
> + # Nothing to do, create empty partition
> + return
> +
> + if 'bs' in source_params:
> + bs = get_byte_count(source_params['bs'])
> + else:
> + bs = get_byte_count('1M')
> +
> + # Create a binary file of the requested size filled with zeros
> + source_file = os.path.join(cr_workdir, 'empty-plugin-zeros%s.bin' %
> part.lineno)
> + if not os.path.exists(os.path.dirname(source_file)):
> + os.makedirs(os.path.dirname(source_file))
> +
> + quotient, remainder = divmod(size, bs)
> + with open(source_file, 'wb') as file:
> + for _ in range(quotient):
> + file.write(bytearray(bs))
> + file.write(bytearray(remainder))
> +
> + part.size = (size + 1024 - 1) // 1024 # size in KB rounded up
> + part.source_file = source_file
> --
> 2.30.2
>
>
>
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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