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#!/bin/env bash
# Craig Jennings <c@cjennings.net>
# Roll back ZFS datasets to a selected snapshot using fzf.
set -euo pipefail
# Usage info
show_help() {
cat << EOF
Usage: ${0##*/} [-h] [-s]
Roll back ZFS datasets to a selected snapshot.
-h display this help and exit
-s single dataset mode (roll back only the selected dataset,
not all datasets with matching snapshot name)
By default, rolling back a snapshot will roll back ALL datasets that share
that snapshot name. Use -s for single dataset rollback.
WARNING: Rolling back destroys all data and snapshots newer than the target.
This operation cannot be undone!
Requires: fzf, zfs
EOF
}
# Check dependencies
for cmd in zfs fzf; do
if ! command -v "$cmd" &> /dev/null; then
echo "Error: $cmd command not found"
exit 1
fi
done
# Check for root/sudo
if [ "$EUID" -ne 0 ]; then
echo "Error: This script must be run as root (use sudo)"
exit 1
fi
# Parse arguments
single_mode=false
while getopts ":hs" opt; do
case ${opt} in
h)
show_help
exit 0
;;
s)
single_mode=true
;;
\?)
echo "Invalid option: -$OPTARG" >&2
show_help
exit 1
;;
esac
done
# Get all snapshots
snapshots=$(zfs list -t snapshot -H -o name 2>/dev/null)
if [ -z "$snapshots" ]; then
echo "No ZFS snapshots found"
exit 0
fi
if $single_mode; then
# Single mode: show full dataset@snapshot names (sorted newest first)
selected=$(zfs list -t snapshot -H -o name -S creation | fzf --height=40% --reverse \
--header="Select snapshot to roll back (ESC to cancel)" \
--preview="zfs list -t snapshot -o name,creation,used,refer -r {1}" \
--preview-window=down:3)
if [ -z "$selected" ]; then
echo "No snapshot selected, exiting"
exit 0
fi
dataset="${selected%@*}"
snap_name="${selected#*@}"
targets=("$selected")
else
# Multi mode: show unique snapshot names, roll back all matching datasets
# Sort reverse so newest (latest date) appears at top
unique_snaps=$(echo "$snapshots" | sed 's/.*@//' | sort -ru)
snap_name=$(echo "$unique_snaps" | fzf --height=40% --reverse \
--header="Select snapshot name to roll back ALL matching datasets (ESC to cancel)" \
--preview="zfs list -t snapshot -o name,creation,used -H | grep '@{}$' | column -t" \
--preview-window=down:10)
if [ -z "$snap_name" ]; then
echo "No snapshot selected, exiting"
exit 0
fi
# Find all datasets with this snapshot
mapfile -t targets < <(echo "$snapshots" | grep "@${snap_name}$")
if [ ${#targets[@]} -eq 0 ]; then
echo "Error: No datasets found with snapshot @${snap_name}"
exit 1
fi
fi
# Display what will happen
echo ""
echo "═══════════════════════════════════════════════════════════════════"
echo " ⚠️ WARNING ⚠️"
echo "═══════════════════════════════════════════════════════════════════"
echo ""
echo "You are about to roll back to snapshot: @${snap_name}"
echo ""
echo "The following datasets will be rolled back:"
for target in "${targets[@]}"; do
dataset="${target%@*}"
echo " • $dataset"
# Show newer snapshots that will be destroyed
newer=$(zfs list -t snapshot -H -o name -S creation "$dataset" 2>/dev/null | \
awk -v snap="$target" 'found {print " ✗ " $0 " (will be DESTROYED)"} $0 == snap {found=1}')
if [ -n "$newer" ]; then
echo "$newer"
fi
done
echo ""
echo "═══════════════════════════════════════════════════════════════════"
echo " THIS OPERATION CANNOT BE UNDONE!"
echo " All data written after the snapshot will be permanently lost."
echo " All snapshots newer than the target will be destroyed."
echo "═══════════════════════════════════════════════════════════════════"
echo ""
# Require explicit confirmation
read -r -p "Type 'yes' to confirm rollback: " confirmation
if [ "$confirmation" != "yes" ]; then
echo "Rollback cancelled"
exit 0
fi
echo ""
echo "Rolling back..."
# Perform rollbacks
failed=0
for target in "${targets[@]}"; do
dataset="${target%@*}"
echo -n " Rolling back $dataset... "
if zfs rollback -r "$target" 2>&1; then
echo "✓"
else
echo "✗ FAILED"
((failed++))
fi
done
echo ""
if [ $failed -eq 0 ]; then
echo "Rollback complete."
else
echo "Rollback completed with $failed failure(s)"
exit 1
fi
|
