URL:
<http://savannah.gnu.org/bugs/?45902>
Summary: BTRFS subvolume - don't resolve symlinks
Project: GNU GRUB
Submitted by: ikcalb
Submitted on: Wed 09 Sep 2015 10:37:19 AM GMT
Category: Filesystem
Severity: Major
Priority: 5 - Normal
Item Group: Feature Request
Status: None
Privacy: Public
Assigned to: None
Originator Name: Florian Kerle
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
Release:
Release: other
Reproducibility: Every Time
Planned Release: None
_______________________________________________________
Details:
BTRFS subvolumes are a convenient way of making backups - especially for the
currently used root filesystem, as they are COW.
SETUP
=====
Using one physical BTRFS partition:
- mounted on `/mnt`
- using folders to group snapshots for logical partitions
(i.e. snapshots for `home` stored in `home@`)
- symlink for the currently used subvolume for each logical partition
```
/mnt
|-home --> ./home@/current
|-home@/
|-current/
|-root --> ./root@/current
|-root@/
|-current/
|-pre-systemd/
|-2013-05-12/
```
CURRENT BEHAVIOR (steps to reproduce)
=====================================
1) when booted to subvolume `root` in the above configuration, issue
`update-grub`
2) check `/boot/grub/grub.cfg`
it will resolve the `root` symlink on `/mnt` to `root@/current`
EXPECTED BEHAVIOR
=================
To ease recovery / switching between snapshots, editing one symlink is more
elegant than
- to move the current subvolume (`root`) away and the backup in place
(not only paths for kernel/initrd when booting had to be updated, but also
fstab - if not replacing the subvolume one way or another)
Unfortunately idk how to determine with which parameters a BTRFS volume was
mounted. (i.e. using the symlink, or the subvolume path directely)
btrfs-tools seem to report the resolved subvolume name only.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?45902>
_______________________________________________
Message sent via/by Savannah
http://savannah.gnu.org/
_______________________________________________
Bug-grub mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/bug-grub
