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Hauser
43 lines
1.7 KiB
Rust
43 lines
1.7 KiB
Rust
// Copyright 2024 RustFS Team
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Enforces that the `dial9` feature is paired with `--cfg tokio_unstable`.
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//!
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//! `dial9` hooks Tokio's unstable runtime instrumentation. The
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//! flag lives in `RUSTFLAGS`, which a caller can silently clobber by exporting
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//! their own value — that used to turn telemetry off with no diagnostic. Fail
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//! the build instead.
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fn main() {
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println!("cargo::rerun-if-changed=build.rs");
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println!("cargo::rerun-if-env-changed=RUSTFLAGS");
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let dial9_enabled = std::env::var_os("CARGO_FEATURE_DIAL9").is_some();
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let tokio_unstable = std::env::var_os("CARGO_CFG_TOKIO_UNSTABLE").is_some();
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if dial9_enabled && !tokio_unstable {
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panic!(
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"\n\
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rustfs-obs: the `dial9` feature requires a `--cfg tokio_unstable` build.\n\
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\n\
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Build telemetry-enabled binaries with:\n\
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\n RUSTFLAGS=\"--cfg tokio_unstable\" cargo build --features dial9\n\
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\n\
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or run `make build-profiling`. Note that setting RUSTFLAGS in the\n\
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environment overrides `.cargo/config.toml`, so the flag must be\n\
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present in the value you export.\n"
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);
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}
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}
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