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https://github.com/nickyeoman/docker-compose-cookbooks.git
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49 lines
2.0 KiB
Bash
49 lines
2.0 KiB
Bash
#!/bin/bash
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process_env_vars() {
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local env_vars="$1" # Accept the environment variables as the first parameter
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local APP_NAME="$(echo "$2" | tr '[:lower:]' '[:upper:]')" # Convert app name to uppercase
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local results=() # Array to collect results
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# Loop through each environment variable
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while IFS= read -r env_var; do
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# Split into name and value parts based on '='
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var_name="${env_var%%=*}" # Variable name
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var_value="${env_var#*=}" # Variable value
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# Check if the variable value contains a reference to another variable with the format ${VAR_NAME:-default}
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if [[ "$var_value" == *'${'*':'*'}'* ]]; then
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# Extract the variable inside the ${} braces
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ref_var="${var_value#\$\{}"
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ref_var="${ref_var%%[:-]*}"
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# Extract the default value part
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default_value="${var_value##*:-}"
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default_value="${default_value%\}}"
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# Check if the reference variable already contains APP_NAME_ prefix
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if [[ "$ref_var" == ${APP_NAME}_* ]]; then
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# If it already contains the prefix, use it as is
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modified_var="${var_name}=\${${ref_var}:-${default_value}}"
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else
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# If not, add the APP_NAME_ prefix
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modified_var="${var_name}=\${${APP_NAME}_${ref_var}:-${default_value}}"
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fi
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else
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# For variables without ${VAR_NAME} references
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if [[ "$var_name" == ${APP_NAME}_* ]]; then
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# If the variable name already starts with APP_NAME_, do not prefix again
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modified_var="${var_name}=${var_value}"
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else
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# Add APP_NAME_ prefix for consistency
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modified_var="${var_name}=\${${APP_NAME}_${var_name}:-${var_value}}"
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fi
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fi
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# Append the modified variable to results
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results+=("$modified_var")
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done <<< "$env_vars"
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# Output the results joined with new lines
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printf "%s\n" "${results[@]}" | sort
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} |