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feat: Enable reading env vars from files (#4359)

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Co-authored-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>
Co-authored-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>
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Alessio Artoni 2025-05-17 23:37:43 +02:00 • committed by GitHub
parent c9aac24a72
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32
target/scripts/startup/variables-stack.sh
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@ -5,6 +5,7 @@ declare -A VARS
function _early_variables_setup() {
__environment_variables_log_level
__environment_variables_from_files
_obtain_hostname_and_domainname
__environment_variables_backwards_compatibility
__environment_variables_general_setup
@ -244,3 +245,34 @@ function __environment_variables_export() {
sort -o /root/.bashrc /root/.bashrc
sort -o /etc/dms-settings /etc/dms-settings
}
# This function sets any environment variable with a value from a referenced file
# when an equivalent ENV with a `__FILE` suffix exists with a valid file path as the value.
function __environment_variables_from_files() {
# Iterate through all ENV found with a `__FILE` suffix:
while read -r ENV_WITH_FILE_REF; do
# Store the value of the `__FILE` ENV:
local FILE_PATH="${!ENV_WITH_FILE_REF}"
# Store the ENV name without the `__FILE` suffix:
local TARGET_ENV_NAME="${ENV_WITH_FILE_REF/__FILE/}"
# Assign a value representing a variable name,
# `-n` will alias `TARGET_ENV` so that it is treated as if it were the referenced variable:
local -n TARGET_ENV="${TARGET_ENV_NAME}"
# Skip if the target ENV is already set:
if [[ -v TARGET_ENV ]]; then
_log 'warn' "ENV value will not be sourced from '${ENV_WITH_FILE_REF}' since '${TARGET_ENV_NAME}' is already set"
continue
fi
# Skip if the file path provided is invalid:
if [[ ! -f ${FILE_PATH} ]]; then
_log 'warn' "File defined for secret '${TARGET_ENV_NAME}' with path '${FILE_PATH}' does not exist"
continue
fi
# Read the value from a file and assign it to the intended ENV:
_log 'info' "Getting secret '${TARGET_ENV_NAME}' from '${FILE_PATH}'"
TARGET_ENV="$(< "${FILE_PATH}")"
done < <(env | grep -Po '^.+?__FILE')
}