user/rsync_tranches.sh

   1 #!/usr/bin/env bash
   2 # Desc: A bash function for splitting up rsync jobs based on size
   3
   4 echo "ERROR:This is a bash function, not a script." 2>&1; exit 1;
   5
   6 function rsync_tranches() {
   7     # Desc: Runs rsync in parallel across different files size ranges
   8     # Example: rsync_tranches -avu --progress --dry-run ./SOURCE/ ./DEST/
   9     # Depends: rsync 3.2.7
  10     # Version: 0.0.2
  11     local -a rsync_opts=();
  12     local source dest;
  13
  14     # Parse arguments until source and destination are found
  15     while [[ $# -gt 0 ]]; do
  16         case "$1" in
  17             # If it's not an option, assume it's the source, then the destination
  18             -*)
  19                 rsync_opts+=("$1");
  20                 shift;
  21                 ;;
  22             *)
  23                 if [ -z "$source" ]; then
  24                     source="$1";
  25                 else
  26                     dest="$1";
  27                 fi;
  28                 shift;
  29                 ;;
  30         esac;
  31     done;
  32
  33     # Validate that source and destination are set
  34     if [[ -z "$source" ]] || [[ -z "$dest" ]]; then
  35         echo "Error: Source and destination directories must be specified." 1>&2;
  36         return 1;
  37     fi;
  38
  39     # Tranche 1: 0 to 1MiB-1
  40     rsync --min-size='0' --max-size='1MiB-1' "${rsync_opts[@]}" "$source" "$dest" &
  41
  42     # Tranche 2: 1MiB to 10MiB-1
  43     rsync --min-size='1MiB' --max-size='10MiB-1' "${rsync_opts[@]}" "$source" "$dest" &
  44
  45     # Tranche 3: 10MiB to 100MiB-1
  46     rsync --min-size='10MiB' --max-size='100MiB-1' "${rsync_opts[@]}" "$source" "$dest" &
  47
  48     # Tranche 4: Greater than 100MiB
  49     rsync --min-size='100MiB' --max-size='8192PiB-1' "${rsync_opts[@]}" "$source" "$dest" &
  50
  51     wait # Wait for all rsync processes to complete
  52 };
  53 export -f rsync_tranches;