list-all-subvolumes


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#!/bin/bash
set -e -o pipefail
btrfs_subvolume_list_args=('-sr')
btrfs_subvolume_list_args=('-a' "$@")

list_all_subvolumes()
{
    for dev in $(list_btrfs)
    do
        [ -b "$dev" ] || return
        d=/run/btrfs-temp-mount/$(systemd-escape "$dev")
        (
            mkdir -p "$d"
            trap 'umount "$d"; rmdir "$d"' EXIT
            set -x
            mountpoint -q "$d" || mount -o ro,subvol=/ "$dev" "$d" || return
            btrfs subvolume list "$@" "$d"
        ) || return
    done
}

list_btrfs()
{
    mount -t btrfs | while read
    do
        printf '%s\n' "${REPLY%% *}"
    done | sort -u
}

list_all_subvolumes "${btrfs_subvolume_list_args[@]}"