Use vendored feature flag with Axum - network is being used

[i-am-logger]

i'm using nix build to build a crate and i get the below error:

my Cargo.toml has this:

utoipa-swagger-ui = { version = "8.0.2", features = ["axum", "vendored"] }

warning: Git tree '/home/snick/Current-Rice/5wall/fw-mono' is dirty
error: builder for '/nix/store/n2ky8201x5ydnr9w6lszp9hdi60m28ir-rust-workspace-deps-unknown.drv' failed with exit code 101;
last 25 log lines:
> Running phase: unpackPhase
> unpacking source archive /nix/store/bzirxdiiryc68lkvnf093zj4rjijry4d-dummy-src
> source root is dummy-src
> Running phase: patchPhase
> Running phase: updateAutotoolsGnuConfigScriptsPhase
> Running phase: configurePhase
> [naersk] cargo_version (read): 1.82.0 (8f40fc59f 2024-08-21)
> [naersk] cargo_message_format (set): json-diagnostic-rendered-ansi
> [naersk] cargo_release: --release
> [naersk] cargo_options:
> [naersk] cargo_build_options: $cargo_release -j "$NIX_BUILD_CORES" --message-format=$cargo_message_format
> [naersk] cargo_test_options: $cargo_release -j "$NIX_BUILD_CORES"
> [naersk] RUST_TEST_THREADS: 32
> [naersk] cargo_bins_jq_filter: .
> [naersk] cargo_build_output_json (created): /build/tmp.sg9NsDNq8G
> [naersk] RUSTFLAGS:
> [naersk] CARGO_BUILD_RUSTFLAGS:
> [naersk] CARGO_BUILD_RUSTFLAGS (updated): --remap-path-prefix /nix/store/w6qdi5h51sjygf1fxs4mlp7f0gp6nvd2-crates-io-dependencies=/sources --remap-path-prefix /nix/store/wpqibkpp4pfkpgkw4phajmazal6yf1hi-git-dependencies=/sources
> Running phase: buildPhase
> cargo build $cargo_release -j "$NIX_BUILD_CORES" --message-format=$cargo_message_format
> error: no matching package named utoipa-swagger-ui-vendored found
> location searched: registry crates-io
> required by package utoipa-swagger-ui v8.0.2
> ... which satisfies dependency utoipa-swagger-ui = "^8.0.2" (locked to 8.0.2) of package api v0.1.0 (/build/dummy-src/api)
> [naersk] cargo returned with exit code 101, exiting
For full logs, run 'nix log /nix/store/n2ky8201x5ydnr9w6lszp9hdi60m28ir-rust-workspace-deps-unknown.drv'.
error: 1 dependencies of derivation '/nix/store/vkcf07lm1zmiafk7lrmzhgw7pffn20g4-rust-workspace-unknown.drv' failed to build

[juhaku]

Okay, that's weird. I am not familiar with nix, and I am wondering is there anything else from the cargo build log perhaps which would indicate whether network was used or something was tried to download.

The docs.rs build is a sandbox as well without outside access and there I am using the vendored feature flag. It would not pass the build there if it did try to download something somewhere. 🤔