snap-to-date.sh

#!/bin/bash
#uncomment the next line to turn on debugging
#DEBUG=1
TARGET="$1"
#determine parent dataset's name
BASE=${TARGET%*@*}
#determine name of the snapshot name
SNAP=${TARGET#*@*}
#get the creation date from the snapshot
CDATE=$(zfs get -H -o value creation "$TARGET")
#convert this from this shape: "Fri May 17 11:52 2013" to YYYY-MM-DD
TODATE=$(date -j -f "%a %B %d %H:%M %Y" "$CDATE"  +%F)
## Debug diagnostics
if [[ 1 = $DEBUG ]]
then
  echo "$TARGET"
  echo "$BASE"
  echo "$SNAP"
  echo "$CDATE"
  echo "$TODATE"
  echo "$BASE"@"$TODATE"
fi
#disable action while debugging
if [[ ! $DEBUG ]]
then
  echo -n "Renaming" "$TARGET" to "$BASE"@"$TODATE":"   "
  zfs rename "$TARGET" "$BASE"@"$TODATE"
  echo "OK"
fi