Last active
August 13, 2024 16:56
-
-
Save twoixter/e97d829b6f46edce757f09fb8fb2d283 to your computer and use it in GitHub Desktop.
Consul watch script to use templates with envsubst
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/bin/bash | |
| # This bash script handles input from Consul Watch (JSON) in order to be able | |
| # to use "envsubst" to fill arbitrary file templates. It handles both single | |
| # as well as multi-object inputs. E.G: JSON strings like "{ object }" or | |
| # "[ {}, {}, array of objects ]". | |
| # | |
| # Usage: | |
| # - Object JSON from Consul comes from standard input. | |
| # - You must provide a file template from which ENV substitution will be made. | |
| # - Consul KEYS are parsed so multi-level keys are parsed and the last | |
| # slug is used in UPPERCASE for ENV substitution. | |
| # | |
| # Example: | |
| # $ cat consul.json | ./test.consul.sh /usr/local/config.template | |
| # | |
| # consul.json: {"Key":"foo/bar/baz", "Value":"TU9BUg==", ...} | |
| # config.template: baz_value = $BAZ | |
| # | |
| # Create temporary file for setting up environment | |
| TEMP_FILE="$(mktemp -q /tmp/consul.env.XXXXXXXXX)" || exit 1 | |
| # Set trap to clean up file | |
| trap 'rm -f -- "$TEMP_FILE"' EXIT | |
| jq -rc 'if type=="array" then .[] else . end | [(.Key | split("/") | last | ascii_upcase), (.Value | @base64d)] | "export " + join("=")' > $TEMP_FILE | |
| source "$TEMP_FILE" | |
| envsubst < $1 | |
| # Clean up temporary file | |
| rm -f -- "$TEMP_FILE" | |
| # trap - EXIT |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment