Auto snapshot keep applies to ALL labels. Restrict to only specified labels is provided

[ArakniD]

The script would keep only the number of snapshots specified by the command line, always, applying to all labels.

I have labels such that;

Monthly = zfs-auto-snap_01 Daily = zfs-auto-snap_02

etc.

This is so Windows can view ALL snapshots because it decodes the DTS with SMB config of

vfs objects = shadowcopy2 shadow: snapdir = .zfs/snapshot shadow: sort = desc shadow: format = zfs-auto-snap%S-%Y-%m-%d-%H%M shadow: localtime = yes

new line below.

SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -o name -s name|grep $opt_prefix${opt_label:+$opt_sep$opt_label} |awk '{ print substr( $0, length($0) - 14, length($0) ) " " $0}' |sort -r -k1,1 -k2,2|awk '{ print substr( $0, 17, length($0) )}') \

With this mod, I can set-up to keep 6 monthly's, 4 weekly, 7 days, and then 4 hourly's for 2 days etc..

[ljluestc]

#!/bin/bash

filesystem="pool/dataset"  # Replace with your ZFS filesystem
desired_snapshots=("Monthly:6" "Daily:7")  # Replace with your desired snapshot counts per label

# Function to delete excessive snapshots for a given label
delete_excessive_snapshots() {
  local label=$1
  local count=$2

  # Get the snapshots for the specified label
  snapshots=$(zfs list -H -t snapshot -o name -s name "$filesystem" | grep "$label")

  # Check if the number of snapshots exceeds the desired count
  snapshot_count=$(echo "$snapshots" | wc -l)
  if ((snapshot_count > count)); then
    # Calculate the number of snapshots to delete
    delete_count=$((snapshot_count - count))

    # Delete the excessive snapshots
    echo "Deleting $delete_count snapshots for label $label:"
    echo "$snapshots" | head -n $delete_count | xargs -r -d '\n' zfs destroy
  else
    echo "No excessive snapshots found for label $label."
  fi
}

# Iterate over the desired snapshot counts
for desired_snapshot in "${desired_snapshots[@]}"; do
  label=$(echo "$desired_snapshot" | cut -d ':' -f 1)
  count=$(echo "$desired_snapshot" | cut -d ':' -f 2)
  delete_excessive_snapshots "$label" "$count"
done