[fsverity-utils PATCH 0/4] Add option to write Merkle tree to a file

[Eric Biggers <ebiggers@kernel.org>]

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.

Supporting this required adding some optional callbacks to
libfsverity_compute_digest().

Eric Biggers (4):
  lib/compute_digest: add callbacks for getting the verity metadata
  programs/test_compute_digest: test the metadata callbacks
  programs/utils: add full_pwrite() and preallocate_file()
  programs/fsverity: add --out-merkle-tree and --out-descriptor options

 include/libfsverity.h          |  46 +++++++++++-
 lib/compute_digest.c           | 130 +++++++++++++++++++++++++++-----
 programs/cmd_digest.c          |   7 +-
 programs/cmd_sign.c            |  17 +++--
 programs/fsverity.c            |  88 +++++++++++++++++++++-
 programs/fsverity.h            |   4 +-
 programs/test_compute_digest.c | 133 +++++++++++++++++++++++++++++++++
 programs/utils.c               |  59 +++++++++++++++
 programs/utils.h               |   3 +
 9 files changed, 458 insertions(+), 29 deletions(-)


base-commit: cf8fa5e5a7ac5b3b2dbfcc87e5dbd5f984c2d83a
-- 
2.31.1