Gravitee is an open source API platform developed by gravitee.io.
A buildpack is a set of scripts which aims at:
- Detecting the language of an application (detect)
- Installing the dependencies of a project (compile)
- Defining how the application should be started (release)
A buildpack has three mandatory entrypoints:
- bin/detect: exit with success (return code is 0) if the buildpack applies to the current application.
- bin/compile: installs the technology.
- bin/release: handles some metadata.
All these entrypoints are Bash script.
Script detect: The purpose of the script located in bin/detect is to detect if the buildpack applies to the application.
It takes the build directory in argument. If the buildpack is applicable, the script must
print on the standard output the name of the technology and return with the code 0.
Script compile: The purpose of the script located in bin/compile is to actually compile the application. It is called with three arguments:
The build directory: contains the code of the application.
The cache directory: used to store information one want to keep between two builds. The environment directory: contains a file per environment variable defined.
Script release: The purpose of the script located in bin/release is to generate some metadata about the application.
It takes the build directory in argument.