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Add option for appending to Procfile #22

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Add option for appending to Procfile #22

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9 changes: 9 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,15 @@ $ git push https://git.heroku.com/example-2.git HEAD:master

When example-1 builds, it'll copy Procfile into /app/Procfile, and when example-2 builds, it'll copy backend/Procfile to /app/Procfile. For example-2, the process types available for you to scale up will be the ones referenced (originally) in backend/Procfile.

## Appending partial `Procfile`s

One or more files may be appended to the `Procfile` by defining them in a comma separated list
in the `PROCFILE_APPEND` environment variable.

```bash
PROCFILE_APPEND=Procfile_a,Procfile_b
```

## Pipelines

Only **builds** will set the proper Procfile. If you use [Heroku Pipelines](https://devcenter.heroku.com/articles/pipelines), then promoting a slug downstream will not trigger a build, and therefore will not look at the environment variable and act accordingly. Make sure that the proper Procfile is referenced all the way upstream to the first stage that builds.
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15 changes: 15 additions & 0 deletions bin/compile
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Expand Up @@ -24,6 +24,21 @@ fi

echo "Copied ${PROCFILE} as Procfile successfully" | indent

PROCFILE_APPEND=$(cat "${ENV_DIR}/PROCFILE_APPEND")

for procfile_addition in ${PROCFILE_APPEND//,/ }
do
if [[ ! -f "${BUILD_DIR}/${procfile_addition}" ]]; then
echo "FAILED to locate file: ${procfile_addition}" | indent
exit 1
fi

printf "\n# Contents of ${procfile_addition} appended below:\n" >> "${BUILD_DIR}/Procfile"
cat "${BUILD_DIR}/${procfile_addition}" >> "${BUILD_DIR}/Procfile"

echo "Appended contents of ${procfile_addition} to Procfile" | indent
done

APP_DIR=$(dirname "${BUILD_DIR}/${PROCFILE}")

if [[ -f "${APP_DIR}/app.json" ]]; then
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