Re: [PATCH 1/5] refs: expose `is_pseudoref_syntax()`

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Karthik Nayak <karthik.188@xxxxxxxxx> writes:

> The `is_pseudoref_syntax()` function is static, since it is only used
> within `refs.c`. In the following commit, we will use this function to
> provide an utility to add pseudorefs to the loose refs cache. So let's
> expose this function via `refs.h`.
>
> Signed-off-by: Karthik Nayak <karthik.188@xxxxxxxxx>
> ---
>  refs.c | 2 +-
>  refs.h | 6 ++++++
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/refs.c b/refs.c
> index 2f58a3460a..5999605230 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -827,7 +827,7 @@ int is_per_worktree_ref(const char *refname)
>  	       starts_with(refname, "refs/rewritten/");
>  }
>  
> -static int is_pseudoref_syntax(const char *refname)
> +int is_pseudoref_syntax(const char *refname)
>  {
>  	const char *c;
>  
> diff --git a/refs.h b/refs.h
> index ff113bb12a..f1bbad83fb 100644
> --- a/refs.h
> +++ b/refs.h
> @@ -846,6 +846,12 @@ const char **hidden_refs_to_excludes(const struct strvec *hide_refs);
>  /* Is this a per-worktree ref living in the refs/ namespace? */
>  int is_per_worktree_ref(const char *refname);
>  
> +/*
> + * Check whether a refname matches the pseudoref syntax. This is a surface
> + * level check and can present false positives.
> + */

What does "false positive" mean in this context?

is_pseudoref_syntax("FOO_HEAD") says "true", and then if it is
"false positive", that would mean "FOO_HEAD" is not a pseudo ref,
right?  What can a caller of this function do to deal with a false
positive?

Or do you mean "FOO_HEAD" is still a pseudo ref, but it may not
currently exist?  That is different from "false positive".

As the check is about "does it match the pseudoref syntax?", I would
understand if what you wanted to say was something like: This only
checks the syntax, and such a pseudoref may not currently exist in
the repository---for that you'd need to call read_ref_full() or
other ref API functions.

Puzzled...

Thanks.




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