doc: basic hash bin delegation repo example + test #1700
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Add 1.0.0 announcment document and point to it in main README. TODO: - Commit message - PR (blocks on theupdateframework#1693, theupdateframework#1675, maybe theupdateframework#1700)
Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>
As 'repository_tool' and 'repository_lib' are being deprecated,
hash bin delegation interfaces are no longer available in this
implementation. The example code in this file demonstrates how to
easily implement those interfaces, and how to use them together
with the TUF metadata API, to perform hash bin delegation.
Note, the hash bin delegation logic in this example is largely
copied from repository_{lib, tool}, and modernized and simplified
for this purpose.
Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>
Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>
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LGTM, I don't have any specific comments on this.
In the future this definitely looks like something that would make sense to package with the repository API somehow:
- manage a "bin container" Targets automatically so repository API user can just "add a new target to bin container" (and in reality target is added to the correct bin)
- figure out how to handle NUMBER_OF_BINS changes (at least provide advice on when and how to handle growth in targets numbers) and other maintenance things.
... but like a lot of repository functionality it looks like something I'd really rather see experimented in an implementation before we add it to any library code
I had the same thought, while revising (and trying to re-understand) the binning logic. In reality a user does not care about the exact NUMBER_OF_BINS, but rather about an "appropriate" distribution of target files over bins. So it probably makes more sense to provide an interface, where the user specifies the expected number of target files (or corresponding classes of target numbers). |
| # The available digits in the hexadecimal representation of the number of bins | ||
| # (minus one, counting starts at zero) determines the length of any hash prefix, | ||
| # i.e. how many left digits need to be considered to assign the hash to a bin. | ||
| PREFIX_LEN = len(f"{NUMBER_OF_BINS - 1:x}") # 2 |
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Maybe add a simple word or comment on what 1:x does.
I had to find it online and because I hadn't used it, it wasn't trivial to me.
In that context, it could be useful to explain somewhere why we use hexadecimal strings.
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Thanks for the comment, @MVrachev! I just pushed a commit trying to make this clearer. Let me know what you think.
| # by each individual bin (BIN_SIZE): | ||
| # | ||
| # The prefix length is the number of digits in the hexadecimal representation | ||
| # (see ':x') of the number of bins minus one (counting starts at zero), i.e. ... |
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| # (see ':x') of the number of bins minus one (counting starts at zero), i.e. ... | |
| # (see "x" integer representation from https://docs.python.org/3/library/string.html#module-string) | |
| of the number of bins minus one (counting starts at zero), i.e. ... |
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Thanks, Martin! I included a slightly modified version of this suggestion. Merging when CI/CD returns...
Tries to clarify the introductory text in the hash bin delegation example. Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>
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Following parallel merges of theupdateframework#1700 (added new test method), and theupdateframework#1710 (started running mypy on tests), ci/cd fails in the develop branch. This is fixed in this patch. Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>
Fixes #1673 (together with #1685)
Description of the changes being introduced by the pull request:
As 'repository_tool' and 'repository_lib' are being deprecated, hash bin delegation interfaces are no longer available in this implementation. The example code in this file demonstrates how to easily implement those interfaces, and how to use them together with the TUF metadata API, to perform hash bin delegation.
Note, the hash bin delegation logic in this example is largely copied from 'repository_{lib, tool}', but modernized and simplified for this purpose.
Notes to reviewers
Thanks!!
Please verify and check that the pull request fulfills the following
requirements: