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118 lines
2.5 KiB
Bash
118 lines
2.5 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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usage() {
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cat <<'EOF'
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Usage:
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preserve-env-values.sh <source-env-file> <target-env-file> <KEY> [KEY...]
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For each KEY, copy the value from <source-env-file> into <target-env-file> only
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when the target value is missing or still looks like a placeholder.
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EOF
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}
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if [[ $# -lt 3 ]]; then
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usage >&2
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exit 1
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fi
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source_env_file="$1"
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target_env_file="$2"
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shift 2
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for env_file in "${source_env_file}" "${target_env_file}"; do
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if [[ ! -f "${env_file}" ]]; then
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echo "Missing env file: ${env_file}" >&2
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exit 1
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fi
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done
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read_env_value() {
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local env_file="$1"
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local key="$2"
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local value
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value="$(
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awk -F= -v key="${key}" '
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/^[[:space:]]*#/ || index($0, "=") == 0 {
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next
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}
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{
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name = $1
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sub(/^[[:space:]]*export[[:space:]]+/, "", name)
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gsub(/^[[:space:]]+|[[:space:]]+$/, "", name)
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if (name == key) {
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value = substr($0, index($0, "=") + 1)
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}
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}
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END {
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print value
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}
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' "${env_file}"
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)"
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value="${value%$'\r'}"
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value="${value#"${value%%[![:space:]]*}"}"
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value="${value%"${value##*[![:space:]]}"}"
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if [[ "${value}" == \"*\" && "${value}" == *\" ]]; then
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value="${value#\"}"
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value="${value%\"}"
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elif [[ "${value}" == \'*\' && "${value}" == *\' ]]; then
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value="${value#\'}"
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value="${value%\'}"
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fi
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printf '%s' "${value}"
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}
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should_preserve_value() {
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local value="$1"
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[[ -z "${value}" || "${value}" == placeholder || "${value}" == replace-with-* || "${value}" == *changeme* || "${value}" == *change-me* ]]
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}
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upsert_env_value() {
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local key="$1"
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local value="$2"
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local tmp_file
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tmp_file="$(mktemp "${target_env_file}.tmp.XXXXXX")"
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awk -v key="${key}" -v value="${value}" '
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BEGIN {
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updated = 0
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}
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/^[[:space:]]*#/ || index($0, "=") == 0 {
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print
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next
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}
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{
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name = $1
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sub(/=.*/, "", name)
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sub(/^[[:space:]]*export[[:space:]]+/, "", name)
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gsub(/^[[:space:]]+|[[:space:]]+$/, "", name)
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if (name == key) {
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print key "=" value
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updated = 1
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next
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}
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print
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}
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END {
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if (!updated) {
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print key "=" value
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}
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}
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' "${target_env_file}" > "${tmp_file}"
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mv "${tmp_file}" "${target_env_file}"
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}
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for key in "$@"; do
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source_value="$(read_env_value "${source_env_file}" "${key}")"
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target_value="$(read_env_value "${target_env_file}" "${key}")"
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if [[ -n "${source_value}" ]] && should_preserve_value "${target_value}"; then
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upsert_env_value "${key}" "${source_value}"
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fi
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done
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