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Eric Biggers
6f64dde651
Make 'fsverity digest' and 'fsverity sign' support writing the Merkle tree and fs-verity descriptor to files, using new options '--out-merkle-tree=FILE' and '--out-descriptor=FILE'. Normally these new options aren't useful, but they can be needed in cases where the fs-verity metadata needs to be consumed by something other than one of the native Linux kernel implementations of fs-verity. This is different from 'fsverity dump_metadata' in that 'fsverity dump_metadata' only works on a file with fs-verity enabled, whereas these new options are for the userspace file digest computation. Link: https://lore.kernel.org/r/20210603195812.50838-5-ebiggers@kernel.org Reviewed-by: Victor Hsieh <victorhsieh@google.com> Signed-off-by: Eric Biggers <ebiggers@google.com>