local/bin/btrfs-snap-all: Init.

.local/bin/btrfs-snap-all

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+usage () {
+	cat <<EOF>&2
+Usage: ${0##*/}
+
+Snapshot all Btrfs subvolumes older than 1 day to a read-only '.snapshots/SUBVOLUME/DATE'.
+
+EOF
+}
+
+if [ $# -ne 0 ]; then
+	usage
+	exit 1
+fi
+
+while IFS= read -r fs; do
+	for subvol in private public; do
+		last=$(ls -1 .snapshots/"$subvol" | tail -1 | sed 's/_/ /')
+		if [ -z "$last" ]; then
+			continue
+		fi
+		last_date=$(date --date="$last" +%s)
+		now=$(date +%s)
+		if [ $(($now - $last_date)) -gt 86400 ]; then
+			choice=N
+			echo -n "==> Snapshot '$fs/${subvol}'? (y/N) "
+			read -r choice
+			case "$choice" in
+			Y|y)
+				btrfs-snap "$fs/$subvol" ;;
+			esac
+			unset choice
+		fi
+		unset now
+		unset last_date
+		unset last
+	done
+done <<EOF
+$(findmnt -t btrfs -n --output TARGET)
+EOF