X-Git-Url: https://git.treefish.org/~alex/backmeupscotty.git/blobdiff_plain/393f03ad49a1175b5a5b7cf0729f975073d2d1cc..7b6f0a768b0231419c761468093ea1b9bde03b42:/backmeupscotty?ds=inline diff --git a/backmeupscotty b/backmeupscotty index 7aa814a..df18802 100644 --- a/backmeupscotty +++ b/backmeupscotty @@ -1,9 +1,10 @@ #!/bin/bash REMOTE_HOST=localhost -REMOTE_BASE=/tmp/backmeupscotty +REMOTE_DIR=/tmp/backmeupscotty/test ARCHIVE_KEEPNBACKUPS=30 ARCHIVE_KEEPNDAYS=30 +BACKUP_RUNEVERYNTHDAY=1 function upperme { echo $(basename $0) | tr '[:lower:]' '[:upper:]' @@ -17,54 +18,84 @@ function scottyerror { echo $(upperme): $@ >&2 } -if [ $(pidof -x $(basename $0) | wc -w) -gt 2 ]; then - scottyerror Another instance of $(basename $0) is already running! - exit 1 -fi +function ssh255 { + ssh $@ + sshret=$? -while getopts ":q" opt; do - case $opt in - q) - exec > /dev/null - ;; - esac -done + if [ $sshret -eq 255 ]; then + scottyerror "SSH connection failed!" + exit 1 + else + return $sshret + fi +} function grepbackups { - ssh $REMOTE_HOST "ls $REMOTE_BASE/$1" | grep -E '[0-9]+-[0-9]+' + ssh255 $REMOTE_HOST "ls $REMOTE_DIR" | grep -E '[0-9]+-[0-9]+' +} + +function isIncomplete { + if ( ssh255 $REMOTE_HOST '[ -d '$REMOTE_DIR/incomplete' ]' ); then + return 0 + else + return 1 + fi +} + +function isNthDay { + if [ $(( ( $(date +%s) / (60*60*24) ) % $BACKUP_RUNEVERYNTHDAY )) -eq 0 ]; + then + return 0 + else + return 1 + fi +} + +function latestTooOld { + for oldbackup in $(grepbackups); do + tstamp=$(echo $oldbackup | cut -d'-' -f1) + + if [ $(( $(date +%s) - $tstamp )) -lt \ + $(( $BACKUP_RUNEVERYNTHDAY*24*60*60 )) ] + then + return 1 + fi + done + + return 0 } function scottysync { timestamp=$(date +%s) - scottyinfo Syncing $1 to $REMOTE_HOST:$REMOTE_BASE/$2 @$timestamp + scottyinfo Syncing $SYNC_SRC to $REMOTE_HOST:$REMOTE_DIR @$timestamp - if [ ! -d "$1" ]; then - scottyerror Source dir $1 does not exist. Not syncing! + if [ ! -d "$SYNC_SRC" ]; then + scottyerror Source dir $SYNC_SRC does not exist. Not syncing! return 1 fi - if [ $(ls -A "$1" | wc -l) -eq 0 ]; then - scottyerror Source dir $1 is empty. Not syncing! + if [ $(ls -A "$SYNC_SRC" | wc -l) -eq 0 ]; then + scottyerror Source dir $SYNC_SRC is empty. Not syncing! return 1 fi - dir_current=$REMOTE_BASE/$2/current - dir_incomplete=$REMOTE_BASE/$2/incomplete - dir_timestamped=$REMOTE_BASE/$2/$timestamp-$(date -d @$timestamp +%Y%m%d%H%M%S) + dir_current=$REMOTE_DIR/current + dir_incomplete=$REMOTE_DIR/incomplete + dir_timestamped=$REMOTE_DIR/$timestamp-$(date -d @$timestamp +%Y%m%d%H%M%S) - if [ -z $3 ]; then + if [ -z $SYNC_EXC ]; then rsync_exclude="" else - rsync_exclude=$(eval echo --exclude={$3} | tr -d {}) + rsync_exclude=$(eval echo --exclude={$SYNC_EXC} | tr -d {}) fi - if (ssh $REMOTE_HOST '[ ! -d '$REMOTE_BASE/$2' ]'); then - scottyinfo Creating destination directory $REMOTE_HOST:$REMOTE_BASE/$2 - ssh $REMOTE_HOST "mkdir $REMOTE_BASE/$2" + if (ssh255 $REMOTE_HOST '[ ! -d '$REMOTE_DIR' ]'); then + scottyinfo Creating destination directory $REMOTE_HOST:$REMOTE_DIR + ssh255 $REMOTE_HOST "mkdir $REMOTE_DIR" fi - if (ssh $REMOTE_HOST '[ -d '$REMOTE_BASE/$2/incomplete' ]'); then + if isIncomplete; then scottyerror Continuing old incomplete backup fi @@ -73,23 +104,118 @@ function scottysync { -v -aHAX --numeric-ids --delete --delete-excluded \ --link-dest=$dir_current \ $rsync_exclude \ - $1/ $REMOTE_HOST:$dir_incomplete/ + $SYNC_SRC/ $REMOTE_HOST:$dir_incomplete/ if [ $? -eq 0 ]; then scottyinfo Timestamping completed backup and linking to current backup - ssh $REMOTE_HOST \ - "mv $dir_incomplete $dir_timestamped && rm -f $dir_current && ln -s $dir_timestamped $dir_current" + ssh255 $REMOTE_HOST \ + "mv $dir_incomplete $dir_timestamped && rm -f $dir_current && ln -s $(basename $dir_timestamped) $dir_current" fi - while [ $(grepbackups $2 | wc -l) -gt $ARCHIVE_KEEPNBACKUPS ]; do - oldestbackup=$(grepbackups $2 | head -1) + while [ $(grepbackups | wc -l) -gt $ARCHIVE_KEEPNBACKUPS ]; do + oldestbackup=$(grepbackups | head -1) oldestbackuptstamp=$(echo $oldestbackup | cut -d'-' -f1) if [ $oldestbackuptstamp -lt $(( $(date +%s) - $ARCHIVE_KEEPNDAYS*60*60*24 )) ]; then scottyinfo Removing old backup $oldestbackup - ssh $REMOTE_HOST rm -r "$REMOTE_BASE/$2/$oldestbackup" + ssh255 $REMOTE_HOST rm -r "$REMOTE_DIR/$oldestbackup" else break fi done } + +function deleteLock { + if ! rmdir /tmp/$(basename $0).lock; then + scottyerror "Could not delete lockfile /tmp/$(basename $0).lock!" + fi +} + +function prepare { + scottyinfo "Preparing for sync" +} + +function cleanup_abort { + scottyerror "Caught exit signal! Cleaning up..." + + cleanup ABORT + + if [ $(jobs -p) ]; then + scottyerror TERMinating remaining child processes... + kill $(jobs -p) + fi + + deleteLock + + exit +} + +function cleanup { + scottyinfo "No cleanup function was defined." +} + +function prepare { + scottyinfo "No prepare function was defined." +} + +function cleanup_normal { + cleanup + deleteLock +} + +function printhelp { + cat < /dev/null + ;; + n) + BACKUP_RUNEVERYNTHDAY=$OPTARG + ;; + h) + printhelp + exit 0 + ;; + esac + done + + ssh255 $REMOTE_HOST exit + + if isNthDay; then + scottyinfo "This is the nth day." + elif latestTooOld; then + scottyinfo "The latest backup is too old." + else + scottyinfo "No backup has to be done. Exiting." + exit 0 + fi + + scottyinfo "Performing backup." + + trap cleanup_abort EXIT + + prepare + scottysync + + trap cleanup_normal EXIT + + exit 0 +} + +if ! mkdir /tmp/$(basename $0).lock; then + scottyerror "Another instance of $(basename $0) is still running!" + exit 1 +else + trap deleteLock EXIT +fi