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gregsexton/gist:8195599

Last active July 1, 2016 04:45
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  1. gregsexton revised this gist Feb 2, 2014. 1 changed file with 6 additions and 3 deletions.
    9 changes: 6 additions & 3 deletions gistfile1.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -17,7 +17,7 @@ EXCLUDES=/etc/backup-excludes
    MIN_SPACE=10000000 #10G
    MIN_INCREMENTS=14

    echo "Starting backup at $DATE"
    echo "\n*** Starting backup at $DATE"

    # Precondition: there should be something mounted on $ROOT
    mount|grep -q $ROOT
    @@ -28,7 +28,10 @@ INC_COUNT=$(ls -1d $ROOT/$BACKUP_PREFIX*|wc -l)
    echo "There are $INC_COUNT incremental backups on $ROOT"
    if [[ $INC_COUNT -gt MIN_INCREMENTS ]]
    then
    rm -vrf $ROOT/$BACKUP_PREFIX*(Om[1])
    OLDEST_BACKUP=$(find $ROOT -maxdepth 1 -name "$BACKUP_PREFIX*"|sort|head -1)
    echo "Removing: $OLDEST_BACKUP"
    rm -rf $OLDEST_BACKUP
    echo "Successfully removed $OLDEST_BACKUP"
    fi

    # Check min space threshold. rsync makes it difficult (without
    @@ -61,4 +64,4 @@ mv -v $WIPDEST $DEST
    rm -vf $LATEST
    ln -s $DEST $LATEST

    echo "Successfully finished backup at $(date "+%Y-%m-%dT%H:%M:%S")"
    echo "*** Successfully finished backup at $(date "+%Y-%m-%dT%H:%M:%S")"
  2. gregsexton created this gist Dec 31, 2013.
    64 changes: 64 additions & 0 deletions gistfile1.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,64 @@
    #! /bin/zsh
    # Backup script written by Greg Sexton

    # bomb out on first non-zero exit code
    set -e
    trap 'echo !!! BACKUP EXITED WITH ERROR STATUS !!!' ERR

    DATE=$(date "+%Y-%m-%dT%H:%M:%S")
    ROOT=/mnt/backup
    BACKUP_PREFIX="bak-"
    WIP_PREFIX="inprogress-"
    DEST=$ROOT/$BACKUP_PREFIX$DATE
    WIPDEST=$ROOT/$WIP_PREFIX$DATE
    LATEST=$ROOT/latest
    INCLUDES=/etc/backup
    EXCLUDES=/etc/backup-excludes
    MIN_SPACE=10000000 #10G
    MIN_INCREMENTS=14

    echo "Starting backup at $DATE"

    # Precondition: there should be something mounted on $ROOT
    mount|grep -q $ROOT
    echo "There is a mount point at $ROOT"

    # Possibly remove the oldest incremental backup
    INC_COUNT=$(ls -1d $ROOT/$BACKUP_PREFIX*|wc -l)
    echo "There are $INC_COUNT incremental backups on $ROOT"
    if [[ $INC_COUNT -gt MIN_INCREMENTS ]]
    then
    rm -vrf $ROOT/$BACKUP_PREFIX*(Om[1])
    fi

    # Check min space threshold. rsync makes it difficult (without
    # parsing) to get the exact space requirement. Use this as a simple
    # heuristic instead.
    if [[ $(df --output=avail $ROOT|sed -e '1d') -lt $MIN_SPACE ]]
    then
    echo "The backup volume does not meet the minimum free space requirement."
    false
    fi

    # Backup
    for source in $(cat $INCLUDES)
    do
    LINKDEST=""
    if [[ -e $LATEST ]]; then; LINKDEST="--link-dest=$LATEST${source%/}"; fi

    echo "* Backing up $source to $DEST"
    rsync -ax --stats $LINKDEST \
    --delete --delete-excluded \
    --exclude-from=$EXCLUDES \
    ${source%/}/ $WIPDEST${source%/}
    done

    # Ensure everything is flushed
    sync

    # Bookkeeping
    mv -v $WIPDEST $DEST
    rm -vf $LATEST
    ln -s $DEST $LATEST

    echo "Successfully finished backup at $(date "+%Y-%m-%dT%H:%M:%S")"