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- #!/usr/bin/env bash
- set -o pipefail ## trace ERR through pipes
- set -o errtrace ## trace ERR through 'time command' and other functions
- set -o nounset ## set -u : exit the script if you try to use an uninitialised variable
- set -o errexit ## set -e : exit the script if any statement returns a non-true return value
- if [[ "$#" -ne 1 ]]; then
- echo "Usage: $0 <file>"
- exit 1
- fi
- SOURCE_FILE="$1"
- BACKUP_FILE="$(dirname "$1")/.$(basename "$1").bak"
- if [[ -f "$BACKUP_FILE" ]]; then
- ## Backup file exists
- ## -> container was restarted
- ## -> restoring configuration
- cp -a -- "$BACKUP_FILE" "$SOURCE_FILE"
- else
- ## Backup file DOESN'T exists
- ## -> container first startup
- ## -> backup configuration
- cp -a -- "$SOURCE_FILE" "$BACKUP_FILE"
- fi
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