Document env variables wrt #95

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Julian Ospald 2021-03-02 10:51:23 +01:00
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@ -18,6 +18,7 @@ Similar in scope to [rustup](https://github.com/rust-lang-nursery/rustup.rs), [p
* [Shell-completion](#shell-completion)
* [Cross support](#cross-support)
* [XDG support](#xdg-support)
* [Env variables](#env-variables)
* [Installing custom bindists](#installing-custom-bindists)
* [Design goals](#design-goals)
* [How](#how)
@ -124,6 +125,17 @@ Then you can control the locations via XDG environment variables as such:
* `XDG_BIN_HOME`: binaries end up here (default: `~/.local/bin`)
* `XDG_CONFIG_HOME`: the config file is stored in `ghcup` subdir as `config.yaml` (default: `~/.config`)
### Env variables
This is the complete list of env variables that change GHCup behavior:
* `GHCUP_USE_XDG_DIRS`: see [XDG support](#xdg-support) above
* `TMPDIR`: where ghcup does the work (unpacking, building, ...)
* `GHCUP_INSTALL_BASE_PREFIX`: the base of ghcup (default: `$HOME`)
* `GHCUP_CURL_OPTS`: additional options that can be passed to curl
* `GHCUP_WGET_OPTS`: additional options that can be passed to wget
* `CC`/`LD` etc.: full environment is passed to the build system when compiling GHC via GHCup
### Installing custom bindists
There are a couple of good use cases to install custom bindists: