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Make (certain) environment variables available at build time #63

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f380804
added export of BUILDVAR_ during compile phase
jrc-dev3 Jun 18, 2022
fe6c6a8
updated README
jrc-dev3 Jun 18, 2022
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8 changes: 8 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,14 @@ RUST_CARGO_BUILD_FLAGS="--release -p some_package --bin some_exe --bin some_bin_
The default value of `RUST_CARGO_BUILD_FLAGS` is `--release`.
If the variable is not set in `RustConfig`, the default value will be used to build the project.

## Set variables to use during build

If you want to set variables that are needed at build time, prefix the variable with ```BUILDVAR_``` when adding to Heroku Config Vars.

```sh
$ heroku config:set BUILDVAR_API_KEY=myapikey
```

## Using the edge version of the buildpack

The `emk/rust` buildpack from the [Heroku Registry](https://devcenter.heroku.com/articles/buildpack-registry) contains the latest stable version of the buildpack. If you'd like to use the latest buildpack code from this Github repository, you can set your buildpack to the Github URL:
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15 changes: 15 additions & 0 deletions bin/compile
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Expand Up @@ -14,6 +14,21 @@ if [ -e "$ENV_DIR/DATABASE_URL" ]; then
export DATABASE_URL="$(cat $ENV_DIR/DATABASE_URL)";
fi

## Export BUILDVAR_ variables at build time.
## Useful in cases where application sets variables at build time.
## E.g. static API_KEY: &str = env!("BUILDVAR_API_KEY");
if ls "$ENV_DIR" 2>/dev/null | grep -q -e ^BUILDVAR_; then
echo "-----> Found BUILDVAR_ variable(s)"
for BUILDVAR in $(ls "$ENV_DIR" | grep -e ^BUILDVAR_); do
VAR_KEY=$BUILDVAR
VAR_VALUE=$(cat $ENV_DIR/$BUILDVAR)
echo "-----> Exporting $VAR_KEY"
export "$VAR_KEY=$VAR_VALUE"
done
else
echo "-----> Found no BUILDVAR_ variable"
fi

# Set defaults for our configuration variables. Stable Rust is sufficiently
# stable at this point that I think we can just default it.
VERSION=stable
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