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-* rsyncshot
-#+begin_SRC sh :tangle rsyncshot :comments no :shebang "#!/bin/bash"
-# rsyncshot
-# Craig Jennings craigmartinjennings@gmail.com
-# Inspired by Mike Rubel: http://www.mikerubel.org/computers/rsync_snapshots/
-#+end_SRC
-* Debugging
-#+begin_SRC sh :tangle rsyncshot :comments org 
-# uncomment next 4 lines for debugging output
-# exec 5> >(logger -t $0)
-# BASH_XTRACEFD="5"
-# PS4='$LINENO: '
-# set -x
-#+end_SRC
-* Default Locations For Setup
-Modify BACKUPLOCATION to point to the mount point of your backup 
-#+begin_SRC sh :tangle rsyncshot :comments org
-MOUNTPOINT=/media/backup;
-SCRIPTLOC=/usr/local/bin/rsyncshot;
-DESTINATION=$MOUNTPOINT/$HOSTNAME
-
-INSTALLHOME=/etc/rsyncshot
-LOGHOME=/var/log/rsyncshot.log;
-
-INCLUDES="$INSTALLHOME/include.txt";
-EXCLUDES="$INSTALLHOME/exclude.txt";
-#+end_SRC
-* Sidestep Alias Conflicts
-Copy, move, and rm commands are often aliased to require user input. 
-Using a variable allows us to sidestep this and complete the actions without any interaction. 
-#+begin_SRC sh :tangle rsyncshot :comments org
-CP="/usr/bin/cp"
-MV="/usr/bin/mv"
-RM="/usr/bin/rm"
-#+end_SRC
-* Prevent Overlapping Runs with Flock
-#+begin_src sh :tangle rsyncshot :comments org
-FLOCKCHECK="flock -x /tmp/rsyncshot.lock -c"
-#+end_src
-* Default Cron Job Entries
-CRON_H = hourly on minute 0 from 1am to 11pm
-CRON_D = daily at midnight, Monday - Saturday
-CRON_W = weekly at midnight on Sundays
-#+begin_SRC sh :tangle rsyncshot :comments org
-CRON_H="0 1-23 * * * $FLOCKCHECK $SCRIPTLOC hourly 22";
-CRON_D="0 0 * * 1-6 $FLOCKCHECK $SCRIPTLOC daily 6";
-CRON_W="0 0 * * 7 $FLOCKCHECK $SCRIPTLOC weekly 51";
-#+end_SRC
-* Functions
-** Help Function
-#+begin_SRC sh :tangle rsyncshot :comments org
-help()
-{
-    printf "\nrsyncshot - compact snapshots on Linux using rsync and hard links.\n\n"
-    printf "Usage:\nrsyncshot <name> <number of backups to retain>\n"
-    printf "          setup (installs rsyncshot and cron jobs)\n"
-    printf "          help  (prints this info)\n"
-    printf "Notes:\n"
-    printf '%s\n'  "- rsyncshot must be run as root"
-    printf '%s\n' "- install and log locations defined in script." 
-    printf '%s\n'
-}
-#+end_SRC
-** Error Function
-#+begin_SRC sh :tangle rsyncshot :comments org
-error()
-{
-    echo "ERROR: $0: $@" 1>&2;
-    echo "See \"rsyncshot help\" for usage."
-    exit 1;
-}
-#+end_SRC
-** Setup Function
-#+begin_SRC sh :tangle rsyncshot :comments org
-setup()
-{    # copy this file to directory on path and make executable
-    $CP -f $0 $SCRIPTLOC
-    sudo chmod +x $SCRIPTLOC 
-    echo "$0 copied to $SCRIPTLOC and is executable"
-    
-    # make install home if it doesn't exist;
-    if [ ! -d $INSTALLHOME ]; then
-	   mkdir -p $INSTALLHOME;
-	   echo "Created install home at $INSTALLHOME.";
-    fi
-
-    # create includes file and add default entries
-    if [ -f $INCLUDES ]; then $RM $INCLUDES; fi
-    printf "/home /etc /usr/local/bin" >> $INCLUDES;
-    echo "modify include file at $INCLUDES";
-
-    # create excludes file and add default entries
-    if [ -f $EXCLUDES ]; then $RM $EXCLUDES; fi
-    printf "*.pyc\n*.pyo\n*.class\n*.elc\n*.o\n*.tmp\n.cache*" >>  $EXCLUDES;
-    echo "modify exclude file at $EXCLUDES";
-
-    # write out current crontab, append default entries, and install
-    crontab -l > crontemp;
-    echo "$CRON_H >> $LOGHOME 2>&1" >> crontemp;
-    echo "$CRON_D >> $LOGHOME 2>&1" >> crontemp;
-    echo "$CRON_W >> $LOGHOME 2>&1">> crontemp;
-    crontab crontemp;
-    $RM crontemp;
-    echo "hourly, daily, and weekly cron jobs installed.";
-}
-#+end_SRC
-
-* Display Help If Requested
-Make the argument uppercase for case insensitivity. 
-#+begin_SRC sh :tangle rsyncshot :comments org
-TYPE=$(tr '[a-z]' '[A-Z]' <<< $1);
-if [ "$TYPE" = "HELP" ]; then help; exit; fi
-#+end_SRC
-* Ensure We're Running As Root
-#+begin_SRC sh :tangle rsyncshot :comments org
-if [ "$EUID" -ne 0 ]; then error "This script must be run as root."; fi
-#+end_SRC
-* Display Start Information 
-#+begin_SRC sh :tangle rsyncshot :comments org
-echo "rsyncshot invoked on `date -u` with: $0 $1 $2";
-#+end_SRC
-* Validate Backup Type
-First argument must be alpha characters
-#+begin_SRC sh :tangle rsyncshot :comments org
-if ! [[ $1 =~ [a-zA-Z] ]]; then error "snapshot type not recognized."; fi
-if [ "$TYPE" = "SETUP" ]; then setup; exit; fi
-#+end_SRC
-* Validate Max Snapshots
-Second argument must be numeric
-#+begin_SRC sh :tangle rsyncshot :comments org
-if ! [[ $2 =~ [0-9] ]]; then error "max snapshots not a number."; fi
-MAX=$(($2-1));
-#+end_SRC
-* Validate Include File (Source Directories) Exist
-Validates the include file exists, and checks the file contents are valid directories
-#+begin_SRC sh :tangle rsyncshot :comments org
-if [ ! -f "$INCLUDES" ]; then error "include file $INCLUDES not found."; fi
-SOURCES=$(<$INCLUDES);
-for SOURCE in $SOURCES
-do
-    if [ ! -d "$SOURCE" ]; then error "source $SOURCE not found"; fi
-done
-#+end_SRC
-* Validate Exclude File (Exclusion Patterns) Exist
-#+begin_SRC sh :tangle rsyncshot :comments org
-if [ ! -f "$EXCLUDES" ]; then error "Exclude file $EXCLUDES not found."; fi
-#+end_SRC
-* Validate Mountpoint 
-Fail if mountpoint doesn't exist. 
-Attempt mounting if destination filesystem not mounted; error if attempt fails. 
-#+begin_SRC sh :tangle rsyncshot :comments org
-  [ -d $MOUNTPOINT ] || error "$MOUNTPOINT doesn't exist!"
-
-  if grep -qs "$MOUNTPOINT" /proc/mounts  ; then
-      true
-  else if  [ $? -eq 0 ]; then 
-           true
-       else
-           error "$MOUNTPOINT unmounted, and mount attempt failed."
-       fi
-  fi
-#+end_SRC
-* Validate Destination Directory Exists
-#+begin_SRC sh :tangle rsyncshot :comments org
-[ -d $DESTINATION ] || mkdir $DESTINATION || error "$DESTINATION doesn't exist, and attempt to create failed."
-#+end_SRC
-* Sync Each Backup Directory In Turn
-#+begin_SRC sh :tangle rsyncshot :comments org
-for SOURCE in $SOURCES
-do
-    rsync -avh -i --times \
-    	  --delete  --delete-excluded \
-    	  --exclude-from=$EXCLUDES \
-    	  --update $SOURCE $DESTINATION/latest ;
-done
-#+end_SRC
-* If Exists, Delete Max+1 Snapshot
-#+begin_SRC sh :tangle rsyncshot :comments org
-if [ -d $DESTINATION/$TYPE.$MAX ]; then
-    $RM -rf $DESTINATION/$TYPE.$MAX;
-fi
-#+end_SRC
-* Rotate Remaining Snapshots Descending
-#+begin_SRC sh :tangle rsyncshot :comments org
-for (( start=$(($MAX)); start>=0; start--)); do
-    end=$(($start+1));
-	if [ -d $DESTINATION/$TYPE.$start ]; then
-	    $MV $DESTINATION/$TYPE.$start $DESTINATION/$TYPE.$end;
-	fi
-done
-#+end_SRC
-* Reset Directory Timestamp
-#+begin_SRC sh :tangle rsyncshot :comments org
-touch $DESTINATION/latest
-#+end_SRC
-* Hard Link Only Copy to Destination
-#+begin_SRC sh :tangle rsyncshot :comments org
-$CP -al $DESTINATION/latest $DESTINATION/$TYPE.0;
-#+end_SRC
-* Make Directory Type Read-Only
-#+begin_SRC sh :tangle rsyncshot :comments org
-chmod -w $DESTINATION/$TYPE.0
-#+end_SRC
-* Print Time and Exit
-#+begin_SRC sh :tangle rsyncshot :comments org
-echo "rsyncshot completed `date -u` ";
-exit 0;
-#+end_SRC