Possible version mismatch

[tommyp6]

Crate name

devzat-rs

Build failure link

https://docs.rs/crate/devzat-rs/0.1.1/builds/580868

Additional details

When I build the crate locally or try to generate the docs with cargo doc --no-deps --open it works fine, however when building on the docs.rs website protoc seems to complain about the protocol definition (This does not happen locally).

[INFO] [stderr]   Error: Custom { kind: Other, error: "protoc failed: devzat.proto:32:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\ndevzat.proto:33:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\ndevzat.proto:36:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\ndevzat.proto:40:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\ndevzat.proto:61:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\ndevzat.proto:63:12: Explicit 'optional' labels are disallowed in the Proto3 syntax. To define 'optional' fields in Proto3, simply remove the 'optional' label, as fields are 'optional' by default.\n" }

[syphar]

this sounds like a duplicate of #1741 , more info there.

Our build-image currently can only contain ubuntu standard packages, and protoc is outdated on these.

until we have #315 your options are probably vendoring (as you stated), or conditional compilation if you don't need protoc for the docs.

[syphar]

( please reopen if I'm mistaken )

[tommyp6]

Thanks for the quick response, this is a duplicate, however I'm not sure how to fix it. I do need protoc to generate the docs, since the whole API revolves around it, and I'm not too sure how to go about vendoring it.

Yep, as usual I've found these pages immediately after had posted questions here :)

Looks like there is no an easy way because even 22.04 has too outdated protoc. The hackery way is to delete protoc binary before build and it will lead to building of vendored protoc in prost-build crate. But it is such a waste of resources and against the good sense.

I have included prost build in my Cargo.toml using the vendored feature, but it still fails with the same issue.

prost-build = { version = "0.10.4", features = ["vendored"] }