How to work around rustup-init failure

(Jin Qing's Column, Mar., 2022)

rustup-init.exe may fail if some anti-virus software is running with realtime protection.

The error message is like this after many retries:

error: could not rename component file from 'C:\.../rust/html' to 'C:\.../rust/html'

See: https://github.com/rust-lang/rustup/issues/1912

And it is not possible to stop the anti-virus for a corporate laptop.

There is a way to workaround this. Here are the steps:

1. Run rustup-init until it begins to retry renaming
2. Kill rustup-init when it is retrying
   • rustup will be installed before the failure
   • do not let rustup-init do the cleanup after the final failure
3. Run rustup update to install all.
4. Run rustup-init again to setup others.

rustup update will report that rustc was not found:

C:\Users\jinqing01>rustup update
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
...
info: removing previous version of component 'rustc'
warning: during uninstall component rustc was not found
...
info: installing component 'rustc'
...  
info: checking for self-updates
  stable-x86_64-pc-windows-msvc updated - rustc 1.59.0 (9d1b2106e 2022-02-23) (from (rustc does not exist))
info: cleaning up downloads & tmp directories

Rerun rustup-init to setup the toolchain:

C:\Users\jinqing01>cargo --version
error: no override and no default toolchain set
C:\Users\jinqing01>d:
D:\>cd tool
D:\Tool>rustup-init.exe
Welcome to Rust!
This will download and install the official compiler for the Rust
programming language, and its package manager, Cargo.
...
Rust is installed now. Great!
Press the Enter key to continue.
D:\Tool>cargo --version
cargo 1.59.0 (49d8809dc 2022-02-10)