X-Git-Url: https://git.treefish.org/~alex/backmeupscotty.git/blobdiff_plain/903b8bbb2deed0a1a827915712ad2ce48b530f8e..aad0734411ecf750bf2233dba6cffb333da50d68:/backmeupscotty?ds=inline

diff --git a/backmeupscotty b/backmeupscotty
index d1500c1..44e9c54 100644
--- a/backmeupscotty
+++ b/backmeupscotty
@@ -1,68 +1,208 @@
 #!/bin/bash
 
 REMOTE_HOST=localhost
-REMOTE_BASE=/tmp/backmeupscotty
+REMOTE_DIR=/tmp/backmeupscotty/test
 ARCHIVE_KEEPNBACKUPS=30
 ARCHIVE_KEEPNDAYS=30
+BACKUP_RUNEVERYNTHDAY=1
 
-while getopts ":q" opt; do
-    case $opt in
-	q)
-	    exec > /dev/null
-	    ;;
-    esac
-done
+function upperme {
+    echo $(basename $0) | tr '[:lower:]' '[:upper:]'
+}
+
+function scottyinfo {
+    echo $(upperme): $@ 
+}
+
+function scottyerror {
+    echo $(upperme): $@ >&2 
+}
+
+function ssh255 {
+    ssh $@
+    sshret=$?
+
+    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+12)*60*60 )) ]
+	then
+	    return 1
+	fi
+    done
+
+    return 0
 }
 
 function scottysync {
     timestamp=$(date +%s)
 
-    echo BACKMEUPSCOTTY: Syncing $1 to $REMOTE_HOST:$REMOTE_BASE/$2 @$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!"
+	return 1
+    fi
+
+    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
-	echo BACKMEUPSCOTTY: 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
-	echo BACKMEUPSCOTTY: Continuing old incomplete backup >&2
+    if isIncomplete; then
+	scottyerror "Continuing old incomplete backup."
     fi
 
-    echo BACKMEUPSCOTTY: Starting rsync
+    scottyinfo "Starting rsync."
     rsync -e ssh \
 	-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
-	echo BACKMEUPSCOTTY: 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"
+	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"
     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
-	    echo BACKMEUPSCOTTY: Removing old backup $oldestbackup
-	    ssh $REMOTE_HOST rm -r "$REMOTE_BASE/$2/$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 cleanup_abort {
+    scottyerror "Caught exit signal! Cleaning up."
+
+    cleanup ABORT
+
+    if [ $(jobs -p) ]; then
+	scottyerror "TERMinating remaining child processes."
+	kill $(jobs -p)
+    fi
+
+    exit
+}
+
+function cleanup {
+    scottyinfo "No cleanup function was defined."
+}
+
+function prepare {
+    scottyinfo "No prepare function was defined."
+}
+
+function printhelp {
+    cat <<EOF
+Usage: $(basename $0) [OPTION]...
+
+Recognized options:
+  -q   Only output errors
+  -n   Run only on nth day
+  -h   Print out this help
+EOF
+}
+
+function backmeupscotty {
+    while getopts "qn:h" opt; do
+	case $opt in
+	    q)
+		exec > /dev/null
+		;;
+	    n)
+		BACKUP_RUNEVERYNTHDAY=$OPTARG
+		;;
+	    h)
+		printhelp
+                exit 0
+                ;;
+	esac
+    done
+    
+    ssh255 $REMOTE_HOST exit
+
+    if latestTooOld; then
+	scottyerror "The latest backup is too old."
+    elif isNthDay; then
+	scottyinfo "This is the nth day."
+    else
+	scottyinfo "No backup has to be done. Exiting."
+	exit 0
+    fi
+
+    scottyinfo "Performing backup."
+
+    trap cleanup_abort EXIT
+
+    prepare
+    scottysync
+
+    trap cleanup EXIT
+
+    exit 0
+}
+
+exec 200>/var/run/$(basename $0).pid
+if ! flock -n 200; then
+    scottyerror "Another instance of $(basename $0) is still running!"
+    exit 1
+fi
+echo $$ 1>&200