Performing backup if nth day or latest backup too old.

[backmeupscotty.git] / backmeupscotty

diff --git a/backmeupscotty b/backmeupscotty
index b3c270389a19cef8603d81a8fb9a4a9a638f88f0..35ec75498b6dc5c70960c13ef144726f3324df0a 100644 (file)
--- a/backmeupscotty
+++ b/backmeupscotty
@@ -30,9 +30,8 @@ function isIncomplete {
     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
@@ -40,6 +39,20 @@ function isIncompleteOrNthDay {
     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)
 
@@ -111,32 +124,46 @@ function prepare {
 }
 
 function cleanup_abort {
-    scottyinfo "No cleanup_abort function was defined."
-}
-
-function _cleanup_abort {
     scottyerror "Caught exit signal! Cleaning up..."
 
-    cleanup_abort
+    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 {
-    scottyinfo "No cleanup_normal function was defined."
+    cleanup
+    deleteLock
+}
+
+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:" opt; do
+    while getopts "qn:h" opt; do
        case $opt in
            q)
                exec > /dev/null
@@ -144,21 +171,30 @@ function backmeupscotty {
            n)
                BACKUP_RUNEVERYNTHDAY=$OPTARG
                ;;
+           h)
+               printhelp
+                exit 0
+                ;;
        esac
     done
 
-    if ! isIncompleteOrNthDay; then
-       scottyinfo "This is not the nth day and no incomplete backup exists."
+    if isNthDay; then
+       scottyinfo "This is the nth day."
+    elif latestTooOld; then
+       scottyerror "The latest backup is too old."
+    else
+       scottyinfo "No backup has to be done. Exiting."
        exit 0
     fi
 
-    trap _cleanup_abort EXIT
+    scottyinfo "Performing backup."
+
+    trap cleanup_abort EXIT
 
     prepare
     scottysync
-    cleanup_normal
 
-    trap deleteLock EXIT
+    trap cleanup_normal EXIT
 
     exit 0
 }