[Pkg-rust-maintainers] Bug#995419: Bug#995419: rust-utf-8: autopkgtest regression: crate directory not found: /usr/share/cargo/registry/utf-8-0.7.6

[Sylvestre Ledru]

Paul, what do you think about Peter's propositoins ?

thanks
S


Le 01/10/2021 à 00:07, peter green a écrit :
>> It passes when run with only packages from testing.
>
> This is not entirely correct, the version of rust-utf-8 in testing
> has no autopkgtests at all. So this is a case of a newly added
> (by a newer version of debcargo) test failing, not a case of an
> existing test regressing.
>
> Investigating, it seems the reason for the failure is that
> the crate is installed in the wrong place. It is installed
> in /usr/share/cargo/registry/utf-0.7.6/ when it should be
> installed in /usr/share/cargo/registry/utf-8-0.7.6/
>
> The reason it's installed in the wrong place is that
> dh-cargo by default determines the crate name from the
> source package name, but source package names are ambiguous
> "rust-utf-8" could mean a crate called "utf" with a major
> version of 8 or it could (and actually does in this case)
> mean a crate called utf-8.
>
> dh-cargo allows a package to specify an explicit crate name
> through X-Cargo-Crate in the source section of the control
> file but debcargo seems to offer no way to set this other
> than overriding the complete control file. There is no mention
> of X-Cargo-Crate in the debcargo source and the mechanism
> for adding arbitrary lines to the generated control file only
> applies to binary package sections.
>
> This also affects rust-md-5 and rust-sha-1, though neither
> of those packages are currently in testing and rust-sha-1
> has not had an upload since debcargo started doing
> autopkgtests
>
> I see a number of possible ways of solving the issue.
>
> 1. Just override the whole control file
>    (debcargo rightly discourages this due to the maintenance
>    burden it creates, but OTOH this issue only affects
>    three crates)
> 2. Add support for adding arbitrary lines to the source
>    section of debian/control in debcargo and use it to
>    manually add X-Cargo-Crate
> 3. Modify dh-cargo to obtain the crate name from Cargo.toml
>    instead of the package name.
>    (would presumablly mean dragging in a perl toml parser
>    which may not be desirable)
> 4. Modify debcargo to generate X-Cargo-Crate lines in
>    cases where dh-cargo would otherwise get the wrong
>    crate name.
> 5. Modify debcargo to generate X-Cargo-Crate lines
>    unconditionally
>
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