Btrbk machine started snapshots automatically - nutthawit/alpine-dotfile GitHub Wiki

cat << EOF > /etc/btrbk/[email protected]
compat busybox

timestamp_format long

snapshot_dir /mnt/btr_pool/btrbk_snapshots
subvolume /mnt/btr_pool/@

EOF

cat << EOF > /etc/btrbk/btrbk-home.conf
compat busybox

timestamp_format long

snapshot_dir /mnt/btr_pool/btrbk_snapshots
subvolume /mnt/btr_pool/home

EOF

cat << 'EOF' > /etc/local.d/create-machine-start-snapshot.start
#!/bin/sh

TARGET_DIR="${1:-/mnt/btr_pool/btrbk_snapshots}"

# Delete last machine start snapshots
find "$TARGET_DIR" -maxdepth 1 -name "*machine_start*" -type d -print -exec btrfs subvolume del {} \;

# Create snapshots
snap @ machine_start
snap home machine_start

EOF
chmod +x /etc/local.d/create-machine-start-snapshot.start

cat << 'EOF' > /usr/local/bin/snap
#!/bin/ash
# snap

show_example() {
	echo "Usage: $0 <subvol_name> <description>"
    echo "Example: $0 @ firefox_installed"
}

if [ $# -eq 0 ]; then
    show_example
	exit 1
fi

if [ "$(id -u)" -ne 0 ]; then
  echo "This script must be run with 'sudo' or as the 'root' user."
  exit 1
fi

subvol_name="$1"
description="$2"

if [ "$subvol_name" == "@" ]; then
	btrbk snapshot -c /etc/btrbk/[email protected] @ | rename-snapshot "$description"
elif [ "$subvol_name" == "home" ]; then
	btrbk snapshot -c /etc/btrbk/btrbk-home.conf home | rename-snapshot "$description"
else
	show_example
    exit 1
fi

EOF
chmod +x /usr/local/bin/snap

cat << 'EOF' > /usr/local/bin/rename-snapshot
#!/bin/sh
# rename-snapshot

# Check if description parameter is provided
if [ $# -eq 0 ]; then
    echo "Usage: $0 <description>"
    echo "Example: btrbk snapshot -c /etc/btrbk/[email protected] @ | $0 firefox_installed"
    exit 1
fi

description="$1"

# Read from stdin if piped, otherwise use first argument
if [ ! -t 0 ]; then
    # Reading from pipe
    input=$(cat)
fi

# Extract just the snapshot name (home.20251006T0809 or @.20251006T0809)
snapshot_name=$(echo "$input" | grep -oE '(home|@)\.[0-9]{8}T[0-9]{4}')

if [ -z "$snapshot_name" ]; then
    echo "Error: Could not extract snapshot name from input"
    exit 1
fi

subvol="${snapshot_name%.*}"      # Everything before the last dot
timestamp="${snapshot_name#*.}"   # Everything after the first dot

# New name format with custom description
new_name=${subvol}.${description}.${timestamp}

# Rename the snapshot
mv "/mnt/btr_pool/btrbk_snapshots/$snapshot_name" "/mnt/btr_pool/btrbk_snapshots/$new_name"
echo "Renamed: $snapshot_name -> $new_name"

EOF
chmod +x /usr/local/bin/rename-snapshot