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Re: [PATCH 01/28] t/test-lib: add an SHA1 prerequisite

On 7 May 2018 at 01:17, brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx> wrote:
> Add an SHA1 prerequisite to annotate both of these types of tests and
> disable them when we're using a different hash.  In the future, we can
> create versions of these tests which handle both SHA-1 and NewHash.

Minor nit: s/can/can and should/

> +
> +# SHA1 is a test if the hash algorithm in use is SHA-1.  This is both for tests
> +# which will not work with other hash algorithms and tests that work but don't
> +# test anything meaningful (e.g. special values which cause short collisions).
> +test_lazy_prereq SHA1 '
> +       test $(git hash-object /dev/null) = e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
> +'

So SHA1 means roughly "git hash-object uses SHA-1, so supposedly
everything on disk is SHA-1." I could imagine one or two different
meanings: "Git was compiled with support for SHA-1 [oids]."

Do we actually need more SHA-1-related prereqs, at least long-term, in
which case we would want to find a more specific name for this one now?
Is this SHA1_STORAGE, or some much better name than that?

I am thinking for example about a repo with NewHash that gets pushed to
and fetched from a SHA-1 server, see hash-function-transition.txt, goal
1b. We'd want to always test that SHA-1-related functionality in git.
(But only until the day when someone defines a prereq such as "SHA1" to
be able to test a git that was compiled without any traces of SHA-1