Symptoms
docker run -it --rm rust:1.49-buster bash
root@8c6989069d3f:/# cargo install --verbose simple-http-server
Updating crates.io index
Fetch [ ] 1.62%
于是参考一些博客尝试修改Rust Crates的mirror，在 $HOME/.cargo/config 中添加如下内容，重新cargo install simple-http-server依然不行
[source.crates-io]
replace-with = 'ustc'
[source.ustc]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"
Cause
潜在默认的索引地址是https://github.com/rust-lang/crates.io-index
Resolution
root@8c6989069d3f:/# echo $CARGO_HOME
/usr/local/cargo
官方的rust镜像配置了$CARGO_HOME环境变量，参看官方网站，配置文件写入$CARGO_HOME/config.toml再次调用发现mirror就生效了
root@8c6989069d3f:/# cat $CARGO_HOME/config.toml
[source.crates-io]
replace-with = "ustc"
[source.ustc]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"
root@8c6989069d3f:/# cargo install --verbose simple-http-server
Updating `https://mirrors.ustc.edu.cn/crates.io-index` index
Fetch [==================> ] 36.22%
ref
- https://mirrors.ustc.edu.cn/help/crates.io-index.html
- https://mirrors.tuna.tsinghua.edu.cn/help/crates.io-index.git/
- https://doc.rust-lang.org/cargo/reference/config.html
- https://doc.rust-lang.org/cargo/reference/source-replacement.html