list-all-subvolumes to list all subvolumes

1 files changed, 30 insertions, 0 deletions

diff --git a/list-all-subvolumes b/list-all-subvolumes
new file mode 100755
index 0000000..89ffc15
--- /dev/null
+++ b/list-all-subvolumes
@@ -0,0 +1,30 @@
+#!/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[@]}"