Michael Ferrari
189d5c020b
This enables deriving the minimum size of the `Verity=hash` partition
using the `Verity=` logic when the size of the `Verity=data` partition
is bigger than the `CopyBlocks=` target.
This enables using `Minimize=true` for an "installer image" and later
using sd-repart to install to a system with reserve space for future
updates by specifying `Size{Min,Max}Bytes=` only in the `Verity=data`
partition, without needing to hardcode the corresponding size for the
`Verity=hash` partition.
While not strictly necessary for `Verity=signature` partitions (since
they have a fixed size) there isn't too much reason to not support it,
since then you can still specify `VerityMatchKey=` to indicate that
the partition is logically still part of that group of partitions.
We ensure that if one of the hash uses `CopyBlocks=` that the data
partition does so as well. Similarly if the signature partition does it
checks that the hash and data partition do so as well. This is to
minimize the chance of accidental misconfiguration of mixing
`CopyBlocks=auto` and `CopyBlocks=<path>` and of manually populating
partitions while hash/sig partitions are copied from existing sources.
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