Like printf for your environment, designed for use in docker-entrypoint.sh to replace template files with current stack variables.
When passed a filename containing a '.env' suffix it will replace all instances of %VARIABLE% found within with their matching environment variable values and write out a new file without the suffix.
Unmatched environment variables or malformed variable names will be ignored. Literal % can be escaped by using %%.
Common usage:
find . -type f -name '*.env' -exec envf {} \; -delete
In Docker:
COPY --from=c45y/envf:latest /bin/envf /bin/envf
An example file:
[icinga_ido]
type = "db"
db = "mysql"
host = "%ICINGA_DBHOST"
port = "3306"
dbname = "%ICINGA_DBNAME%"
username = "%ICINGA_USERNAME%"
password = "%ICINGA_PASSWORD%"
charset = "utf8"
use_ssl = "0"