Commits on Jun 16, 2020

1. bootstrap: read config from $RUST_BOOTSTRAP_CONFIG …

   This commit modifies bootstrap so that `config.toml` is read first from
   `RUST_BOOTSTRAP_CONFIG`, then `--config` and finally `config.toml` in the
   current directory.
   
   This is a subjective change, intended to improve the ergnomics when
   using "development shells" for rustc development (for example, using tools
   such as Nix) which set environment variables to ensure a reproducible
   environment (these development shells can then be version controlled). By
   optionally reading `config.toml` from an environment variable, a `config.toml`
   can be defined in the development shell and a path to it exposed in the
   `RUST_BOOTSTRAP_CONFIG` environment variable - avoiding the need to manually
   symlink the contents of this file to `config.toml` in the working
   directory.
   
   Signed-off-by: David Wood <david@davidtw.co>

   

   davidtwco committed Jun 16, 2020
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