protoc-rust 2.21.0

protoc --rust_out=... available as API. protoc needs to be in $PATH, protoc-gen-run does not.
Documentation
Build #346271 2021-02-06T01:23:25.392540+00:00
# rustc version
rustc 1.51.0-nightly (04caa632d 2021-01-30)
# docs.rs version
docsrs 0.6.0 (66fa7c8 2021-02-04)

# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/protoc-rust-2.21.0/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/protoc-rust-2.21.0/source:/opt/rustwide/workdir:ro,Z" "-v" "/home/cratesfyi/workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/home/cratesfyi/workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "DOCS_RS=1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "3221225472" "--cpus" "2" "--user" "1001:1001" "--network" "none" "rustops/crates-build-env@sha256:ce6408862c0f4858e6cd2b85b2cf085ff7d0d6323904d0a94b71664a228554ab" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--all-features" "-Zunstable-options" "--config=doc.extern-map.registries.crates-io=\"https://docs.rs\"" "-j2" "--" "-Z" "unstable-options" "--resource-suffix" "-20210130-1.51.0-nightly-04caa632d" "--static-root-path" "/" "--cap-lints" "warn" "--disable-per-crate-search", kill_on_drop: false }`
[INFO] [stdout] 4869214b044283156769c35c97879fb8a32f9c08412b27ffa268eea9774f9ed0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4869214b044283156769c35c97879fb8a32f9c08412b27ffa268eea9774f9ed0", kill_on_drop: false }`
[INFO] [stderr] /opt/crates-build-env/entrypoint.sh: line 7: /etc/hosts: Permission denied
[INFO] [stderr]    Compiling libc v0.2.85
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling protobuf v2.21.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]     Checking rand_core v0.6.1
[INFO] [stderr]     Checking protobuf-codegen v2.21.0
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.23
[INFO] [stderr]     Checking thiserror v1.0.23
[INFO] [stderr]     Checking which v4.0.2
[INFO] [stderr]     Checking protoc v2.21.0
[INFO] [stderr]  Documenting protoc-rust v2.21.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.39s
[INFO] running `Command { std: "docker" "inspect" "4869214b044283156769c35c97879fb8a32f9c08412b27ffa268eea9774f9ed0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4869214b044283156769c35c97879fb8a32f9c08412b27ffa268eea9774f9ed0", kill_on_drop: false }`
[INFO] [stdout] 4869214b044283156769c35c97879fb8a32f9c08412b27ffa268eea9774f9ed0