Tree based upon parent / child relationship

[HaleTom]

Would you consider the ability to list the tree by parent snapshot heirarchy?

[etskinner]

I'm not sure what you mean, could you give an example?

[HaleTom]

I'd like to be able to visually represent relationships between parent/child snapshots, such as shown by:

$ sudo btrfs sub list -qu . | grep home-var
ID 260 gen 12308 top level 257 parent_uuid - uuid 7898449e-382e-1848-af9e-595f3c5b0769 path btrbk/home-var
ID 471 gen 374 top level 260 parent_uuid - uuid 091ae071-7c5d-dc42-a2f0-38a8ed147725 path home-var.20170816T1200
ID 803 gen 4244 top level 260 parent_uuid 8c6a337e-a161-314b-b983-79bd2ade0d99 uuid fc8f634b-1e9c-2a47-b7ac-68abdeb303f1 path home-var.20170827T1431
ID 941 gen 5030 top level 260 parent_uuid fd70bd9f-657e-3e45-9b32-a32fdfa82e3c uuid 31955d33-4921-2e40-853c-8b95a84f7b6b path home-var.20170903T0000
ID 1388 gen 9704 top level 260 parent_uuid 35003b19-24ea-6f45-aa7e-fcc0b6e29a2c uuid 8d58ea35-3482-7340-b174-81470e1fac71 path home-var.20170910T0000
ID 1483 gen 10177 top level 260 parent_uuid 121915d0-2990-6941-b92a-b75b7be32d8d uuid de536fe5-0e65-8145-9e90-210e7c19da85 path home-var.20170911T0000
ID 1532 gen 10376 top level 260 parent_uuid b94ad682-d6de-3646-a266-bf0452a71ea0 uuid 6ee008ce-cba8-8442-b673-ce099f532284 path home-var.20170912T1137
ID 1562 gen 10762 top level 260 parent_uuid 37b9d30a-3069-1e41-85c4-0f8e2b887e2e uuid 04950750-0e5f-4f42-b566-44a070d58fcc path home-var.20170913T1057
ID 1611 gen 11132 top level 260 parent_uuid a96ee54d-a127-9d47-b718-1c7c065438a4 uuid 6fa2212a-3054-3642-ba91-26165679df52 path home-var.20170914T0000
ID 1655 gen 11551 top level 260 parent_uuid 871fa6d0-b65c-9e42-b127-817ac2469294 uuid 0b104a79-5fbe-714c-a7aa-ad33a54d0e4b path home-var.20170914T2026
ID 1656 gen 11628 top level 260 parent_uuid 0b104a79-5fbe-714c-a7aa-ad33a54d0e4b uuid 857e57fb-a571-594b-8808-16b03c35e8d4 path home-var.20170914T2100
ID 1663 gen 11697 top level 260 parent_uuid 857e57fb-a571-594b-8808-16b03c35e8d4 uuid ffb6ba9c-e684-c441-a37f-679eeef2f456 path home-var.20170914T2200
ID 1666 gen 11776 top level 260 parent_uuid ffb6ba9c-e684-c441-a37f-679eeef2f456 uuid 5156529d-1a6d-804b-aa6d-bcee4e5e71fe path home-var.20170914T2300
ID 1669 gen 11804 top level 260 parent_uuid 5156529d-1a6d-804b-aa6d-bcee4e5e71fe uuid ace72515-ccda-7d4c-b201-83e2f744c53e path home-var.20170915T0000
ID 1672 gen 11872 top level 260 parent_uuid ace72515-ccda-7d4c-b201-83e2f744c53e uuid a3b6dbea-88f2-9d40-9c47-b8cd9990d3d4 path home-var.20170915T0100
ID 1676 gen 11999 top level 260 parent_uuid a3b6dbea-88f2-9d40-9c47-b8cd9990d3d4 uuid 9bba90ba-87e3-a04c-aca4-f6f7fc4192b0 path home-var.20170915T0200
ID 1679 gen 12087 top level 260 parent_uuid 9bba90ba-87e3-a04c-aca4-f6f7fc4192b0 uuid 27604274-dc31-9348-bc19-c8abef7d4a2e path home-var.20170915T0300
ID 1682 gen 12109 top level 260 parent_uuid 27604274-dc31-9348-bc19-c8abef7d4a2e uuid ad9153cd-0ce3-c14b-98af-569082d71025 path home-var.20170915T0400
ID 1685 gen 12135 top level 260 parent_uuid ad9153cd-0ce3-c14b-98af-569082d71025 uuid e955e660-4317-844b-bb37-87c23f29b4f3 path home-var.20170915T0500
ID 1689 gen 12160 top level 260 parent_uuid e955e660-4317-844b-bb37-87c23f29b4f3 uuid 17d8b837-259c-194e-b377-ab86dd598bee path home-var.20170915T0600
ID 1692 gen 12200 top level 260 parent_uuid 17d8b837-259c-194e-b377-ab86dd598bee uuid 1a9516ad-0070-d542-8488-e00da8eacb4c path home-var.20170915T0700
ID 1695 gen 12222 top level 260 parent_uuid 1a9516ad-0070-d542-8488-e00da8eacb4c uuid 975f9686-dc6e-a64f-9d9d-860a7816b45f path home-var.20170915T0800
ID 1698 gen 12253 top level 260 parent_uuid 975f9686-dc6e-a64f-9d9d-860a7816b45f uuid 1e596cb5-fb0b-b746-ac91-e3465bfa728c path home-var.20170915T0900
ID 1703 gen 12256 top level 260 parent_uuid 1e596cb5-fb0b-b746-ac91-e3465bfa728c uuid 68855474-05b9-f040-9b13-236a2aa6c24c path home-var.20170915T1627
ID 1704 gen 12299 top level 260 parent_uuid 68855474-05b9-f040-9b13-236a2aa6c24c uuid b0e7e187-8848-5247-933b-a13fe531b8d1 path home-var.20170915T1700
ID 1714 gen 12302 top level 260 parent_uuid b0e7e187-8848-5247-933b-a13fe531b8d1 uuid 5cb73bc9-17c7-8448-8f00-fdcdb6863521 path home-var.20170915T1800
ID 1715 gen 12305 top level 260 parent_uuid 5cb73bc9-17c7-8448-8f00-fdcdb6863521 uuid 004de2f8-0d34-2342-9649-cc3720ad216e path home-var.20170915T1900
ID 1716 gen 12308 top level 260 parent_uuid 004de2f8-0d34-2342-9649-cc3720ad216e uuid d303af97-79c4-b74a-85d1-954d0a4a8a41 path home-var.20170915T2000
ID 1717 gen 12308 top level 260 parent_uuid d303af97-79c4-b74a-85d1-954d0a4a8a41 uuid 91c81178-6ec2-e648-bddd-3ea7e15366cf path home-var.20170915T2100

Here, the output is a visual mess, even though each of the later timestamp-named subvolumes has the previous as a parent.

Many backup programs (eg btrbk) generate snapshots like this.

It's not obvious when:

• A snapshot is a child of another
• A snapshot is not a child of another

[etskinner]

Perfect, thanks for the input. I'll try to integrate that when I get some time.