s3.common

   1 # -*- Shell-Script -*-
   2 # Common functions for dealing with Amazon S3.
   3
   4 # units for BWLIMIT are KB/s
   5 BWLIMIT=325
   6 # units for CHUNKSIZE are MB
   7 CHUNKSIZE=5000
   8
   9 BUCKET=hcoop.net-backups
  10 BACKUPDIR=full
  11 S3CMD=$(dirname $0)/s3
  12
  13 IFS=$'\n'
  14
  15 export S3_ACCESS_KEY_ID=$(cat ~mwolson_admin/.amazon/access.key)
  16 export S3_SECRET_ACCESS_KEY=~mwolson_admin/.amazon/secret.key
  17
  18 function s3_cmd () {
  19     # $1: command (get|put|ls|rm)
  20     # $2: remote file
  21     # $3: local file
  22     local cmd=$1
  23     shift
  24     local bwarg
  25     if test "$cmd" = "put"; then
  26         bwarg="${BWLIMIT}K";
  27     else
  28         bwarg=
  29     fi
  30     $S3CMD $cmd $BUCKET "$1" "$2" $bwarg
  31 }
  32
  33 function move_over () {
  34     # Move file to its offsite destination.
  35     # Expects the file to come from STDIN.
  36     # $1: date subdirectory
  37     # $2: filename
  38     if test -z "$2" || test -n "$3"; then
  39         echo "Bad programming"
  40         exit 1
  41     fi
  42     local subdir=$1
  43     local file=$2
  44     local dest=$BACKUPDIR/$subdir
  45     local ret
  46     split -d -b ${CHUNKSIZE}m - ${file}.
  47     for i in ${file}.*; do
  48         echo "Transferring $i to S3 ..."
  49         s3_cmd put $dest/$i $i
  50         rm -f $i
  51     done
  52 }
  53
  54
  55 function prune_old_backups () {
  56     # Implement me
  57     local subdir=$1
  58     local oldpwd=$PWD
  59     cd $BACKUPDIR
  60     find . -mindepth 1 -maxdepth 1 -type d -ctime +7 \
  61         -execdir rm -fr '{}' \; || true
  62     rm -rf $SUBDIR
  63     mkdir -p $SUBDIR
  64     cd $oldpwd
  65 }