Does diffoscope compares disk partitions

Mattia Rizzolo mattia at
Wed Mar 1 20:58:13 UTC 2023

Hello Thomas,

On Wed, Mar 01, 2023 at 09:44:56PM +0100, Thomas Schmitt wrote:
> There are various layouts. Some are quite awkward and invite for getting
> lost in the woods. (Actually they lure firmwares out of the woods.)

I already knew that hybrid ISO 9660 are pretty much devil's offspring,
and I guess I could have done without your introduction to them /o\

> All these images contain block ranges which are neither covered by the
> ISO 9660 file tree nor by the partitions.
> One will always first have to compare such ISOs byte-by-byte and only in
> case of mismatch look into the ISO filesystem and partitions for a more
> qualified presentation of the differences.

FWIW, currently diffoscope _does_ have a iso9660 comparator, but that
just runs libarchive on it, so I _believe_ it ignores the existence of
an eventual partition table and just goes straight to the really
compliant "data part" of the image.

I know that thing has been used to work on reproducible bootable image,
so I guess it just always happened that the "hybrid part" of them were
already reproducible :3
Else I reckon somebody would have provided some improvements in this
area already.

                        Mattia Rizzolo

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