The aim of this binary is to map environment variables to a file, akin to Kubernetes' ConfigMaps feature. This can be useful in environments where configarion files need to be injected during runtime.
For each mapping, add two environment variables, 1) a variable ending in
_CONFIGMAP and containing a triple of path, Permissions, and cfg, and
2) a config to write to the file the key of which is the value of the cfg
component of the triple.
For example, in order to add a config.yaml to /etc/app/config.yaml with
ReadOnly (444) permissions, add the following variables:
TEST_CONFIGMAP=/etc/app/config.yaml,ReadOnly,TEST_CFG
TEST_CFG=<yaml>- The use of this binary requires embedding it in the image you wish to use it in.
- The binary is executed during runtime by the (Docker) user. As such, it needs to be part of the entrypoint of the image and config files can only be written to directories that the user has write access to.
- Currently uses Rust's
std::fs::permissionsmodule, which is not Unix-specific, permissions are therefore limited to ReadOnly (444) and ReadWrite (666).