diff --git a/rotate.sh b/rotate.sh index 195d2d7..18371e8 100755 --- a/rotate.sh +++ b/rotate.sh @@ -1,120 +1,120 @@ #!/bin/bash ### # Stupid script to rotate a backup # # Author: Valerio B. # Date: Wed 4 Ago 2020 ## # do not proceed in case of errors set -e # current directory MYDIR="$(dirname "$(realpath "$0")")" # include all the stuff and useful functions . "$MYDIR"/bootstrap.sh # arguments place="$1" days="$2" max="$3" last_timestamp_file="$place.timestamp" # current timestamp current_timestamp=$(date +%s) # show usage function show_help_rotate() { echo "USAGE" echo " $0 PATH DAYS MAX_ROTATIONS" echo "EXAMPLE" echo " $0 /home/backups 1 30" } # all the arguments must exist (just check the last one) if [ -z "$max" ]; then echo "Bad usage" show_help_rotate exit 1 fi # the place to be rotated must exist if [ ! -e "$place" ]; then error "unexisting directory '$place'" exit 2 fi # validate max parameter if [ "$max" -lt 2 ]; then echo "The MAX parameter must be greater than 1" show_help_rotate exit 3 fi # check if the last timestamp was writed if [ -f "$last_timestamp_file" ]; then # check the timestamp saved in the file timestamp=$(<"$last_timestamp_file") if [ "$timestamp" -lt 1000 ]; then echo "bad format in file $last_timestamp_file" exit fi # seconds spent from the last rotation diff_seconds=$(( "$current_timestamp" - "$timestamp" )) # expected seconds from the last rotation before continuing expected_seconds=$(( "$days" * 86400 )) # check if it's not passed enought time if [ "$diff_seconds" -lt "$expected_seconds" ]; then warn "Doing nothing: last rotation was executed $diff_seconds seconds ago (expected at least $expected_seconds)" exit fi fi # save the last timestamp before rotating everything # this will avoid even parallel rotations echo $(date +%s) > "$last_timestamp_file" # eventually drop the last backup step # if it does not exist, don't care max_path="$place.$max" drop "$max_path" # shift all the backups after="$max" while [[ "$after" -gt 1 ]]; do before=$(( "$after" - 1 )) # do not process the root directory for no reason in the world if you type that by mistake # the --preserve-root is already implicit but... let's be sure! asd before_path="$place.$before" after_path="$place.$after" # the source must exist. asd if [ -e "$before_path" ]; then # the trailing slash means: copy files and not just the directory move "$before_path/" "$after_path" fi - #`next + # next after="$before" done # at the end, move the base forward # the trailing slash means: copy files and not just the directory copy "$place/" "$place.1" # now you are ready to overwrite "$place"