X-Git-Url: https://git.treefish.org/~alex/backmeupscotty.git/blobdiff_plain/1aa0158b6b4d4aaca7f413d76aec814a206a212b..0984727e5376cebd26b5ff6e9469cfc63d0c756d:/backmeupscotty diff --git a/backmeupscotty b/backmeupscotty index ed41ae2..80392a3 100644 --- a/backmeupscotty +++ b/backmeupscotty @@ -6,49 +6,56 @@ ARCHIVE_KEEPNBACKUPS=30 ARCHIVE_KEEPNDAYS=30 BACKUP_RUNEVERYNTHDAY=1 -function upperme { - echo $(basename $0) | tr '[:lower:]' '[:upper:]' +_ERROR_ENCOUNTERED=0 +_UPPERME=$(echo $(basename $0) | tr '[:lower:]' '[:upper:]') + +function timestamp { + date +"[%y-%m-%d %H:%M:%S]" +} + +function scottyline { + echo $(timestamp) $_UPPERME: $@ } function scottyinfo { - echo $(upperme): $@ + if ($_ERROR_ENCOUNTERED -eq 0); then + scottyline $@ + else + scottyline $@ >&2 + fi } function scottyerror { - echo $(upperme): $@ >&2 + scottyline $@ >&2 + _ERROR_ENCOUNTERED=1 } -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 "qn:" opt; do - case $opt in - q) - exec > /dev/null - ;; - n) - BACKUP_RUNEVERYNTHDAY=$OPTARG - ;; - esac -done + if [ $sshret -eq 255 ]; then + scottyerror "SSH connection failed!" + exit 1 + else + return $sshret + fi +} function grepbackups { - ssh $REMOTE_HOST "ls $REMOTE_DIR" | grep -E '[0-9]+-[0-9]+' + ssh255 $REMOTE_HOST "ls $REMOTE_DIR" | grep -E '[0-9]+-[0-9]+' } function isIncomplete { - if ( ssh $REMOTE_HOST '[ -d '$REMOTE_DIR/incomplete' ]' ); then + if ( ssh255 $REMOTE_HOST '[ -d '$REMOTE_DIR/incomplete' ]' ); then return 0 else return 1 fi } -function isIncompleteOrNthDay { - if isIncomplete || \ - [ $(( ( $(date +%s) / (60*60*24) ) % $BACKUP_RUNEVERYNTHDAY )) -eq 0 ]; +function isNthDay { + if [ $(( ( $(date +%s) / (60*60*24) ) % $BACKUP_RUNEVERYNTHDAY )) -eq 0 ]; then return 0 else @@ -56,18 +63,32 @@ function isIncompleteOrNthDay { fi } +function latestTooOld { + for oldbackup in $(grepbackups); do + tstamp=$(echo $oldbackup | cut -d'-' -f1) + + if [ $(( $(date +%s) - $tstamp )) -lt \ + $(( ($BACKUP_RUNEVERYNTHDAY*24+12)*60*60 )) ] + then + return 1 + fi + done + + return 0 +} + function scottysync { timestamp=$(date +%s) - scottyinfo Syncing $SYNC_SRC to $REMOTE_HOST:$REMOTE_DIR @$timestamp + scottyinfo "Syncing $SYNC_SRC to $REMOTE_HOST:$REMOTE_DIR @$timestamp." if [ ! -d "$SYNC_SRC" ]; then - scottyerror Source dir $SYNC_SRC does not exist. Not syncing! + scottyerror "Source dir $SYNC_SRC does not exist. Not syncing!" return 1 fi if [ $(ls -A "$SYNC_SRC" | wc -l) -eq 0 ]; then - scottyerror Source dir $SYNC_SRC is empty. Not syncing! + scottyerror "Source dir $SYNC_SRC is empty. Not syncing!" return 1 fi @@ -81,16 +102,16 @@ function scottysync { rsync_exclude=$(eval echo --exclude={$SYNC_EXC} | tr -d {}) fi - if (ssh $REMOTE_HOST '[ ! -d '$REMOTE_DIR' ]'); then - scottyinfo Creating destination directory $REMOTE_HOST:$REMOTE_DIR - ssh $REMOTE_HOST "mkdir $REMOTE_DIR" + if (ssh255 $REMOTE_HOST '[ ! -d '$REMOTE_DIR' ]'); then + scottyinfo "Creating destination directory $REMOTE_HOST:$REMOTE_DIR." + ssh255 $REMOTE_HOST "mkdir $REMOTE_DIR" fi if isIncomplete; then - scottyerror Continuing old incomplete backup + scottyerror "Continuing old incomplete backup." fi - scottyinfo Starting rsync + scottyinfo "Starting rsync." rsync -e ssh \ -v -aHAX --numeric-ids --delete --delete-excluded \ --link-dest=$dir_current \ @@ -98,9 +119,11 @@ function scottysync { $SYNC_SRC/ $REMOTE_HOST:$dir_incomplete/ if [ $? -eq 0 ]; then - scottyinfo Timestamping completed backup and linking to current backup - ssh $REMOTE_HOST \ + scottyinfo "Timestamping completed backup and linking to current backup." + ssh255 $REMOTE_HOST \ "mv $dir_incomplete $dir_timestamped && rm -f $dir_current && ln -s $(basename $dir_timestamped) $dir_current" + else + scottyerror "Rsync failed." fi while [ $(grepbackups | wc -l) -gt $ARCHIVE_KEEPNBACKUPS ]; do @@ -108,59 +131,101 @@ function scottysync { oldestbackuptstamp=$(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_DIR/$oldestbackup" + scottyinfo "Removing old backup $oldestbackup." + ssh255 $REMOTE_HOST rm -r "$REMOTE_DIR/$oldestbackup" else break fi done } -function prepare { - scottyinfo "Preparing for sync" +function deleteLock { + if ! rmdir /var/lock/$(basename $0); then + scottyerror "Could not delete lockfile /tmp/$(basename $0).lock!" + fi } -function cleanup_abrt { - scottyinfo "No cleanup_abrt function was defined." -} +function cleanup_abort { + scottyerror "Caught exit signal! Cleaning up." + + cleanup ABORT -function _cleanup_abrt { - scottyerror "Caught exit signal! Cleaning up..." - cleanup_abrt if [ $(jobs -p) ]; then - scottyerror TERMinating remaining child processes... + scottyerror "TERMinating remaining child processes." kill $(jobs -p) fi + + deleteLock + exit } -function prepare { - scottyinfo "No prepare function was defined." +function cleanup { + scottyinfo "No cleanup function was defined." } -function _prepare { - prepare +function prepare { + scottyinfo "No prepare function was defined." } function cleanup_normal { - scottyinfo "No cleanup_normal function was defined." + cleanup + deleteLock } -function _cleanup_normal { - cleanup_normal +function printhelp { + cat < /dev/null + ;; + n) + BACKUP_RUNEVERYNTHDAY=$OPTARG + ;; + h) + printhelp + exit 0 + ;; + esac + done + + ssh255 $REMOTE_HOST exit + + if latestTooOld; then + scottyerror "The latest backup is too old." + elif isNthDay; then + scottyinfo "This is the nth day." + else + scottyinfo "No backup has to be done. Exiting." exit 0 fi - trap _cleanup_abrt EXIT + scottyinfo "Performing backup." - _prepare + trap cleanup_abort EXIT + + prepare scottysync - _cleanup_normal - trap - EXIT + trap cleanup_normal EXIT + + exit 0 } + +if ! mkdir /var/lock/$(basename $0); then + scottyerror "Another instance of $(basename $0) is still running!" + exit 1 +else + trap deleteLock EXIT +fi