Hi Philipp,
Thank you for the clarification, and sorry for my tardy reply.
On Wed, Jan 04, 2017 at 12:04:09AM +0100, Philipp Kern wrote:
> On 12/19/2016 05:49 AM, Nicholas D Steeves wrote:
> > Which rescue mode, and where? Please tell me so I can fix it! From
> > what I've read, setting a default subvolid != 5 was explored by other
> > distributions, and abandoned.
>
> rescue-mode is in [0]. That presents you with a menu where you can
> select local root filesystems. That should somehow DTRT instead of
> mounting the top-level btrfs filesystem with the root filesystem being
> below. I suppose it'd be also ok to mount it as-is, as long as the shell
> is spawned in the right place. (Although that might be surprising.)
>
> The mode is triggered by passing "rescue/enable=true" on the kernel
> command-line. d-i ships with boot menu items that do this.
>
> Kind regards
> Philipp Kern
>
> [0] https://anonscm.debian.org/cgit/d-i/rescue.git/tree/
>
Oh, there! I had already checked that out in
debian-installer/packages/rescue. :-) From what I gather, DTRT looks
something like one of the following:
1. Use existing choose partition menu
* select partition menu
* test if selected partition is a btrfs volume
- if there are no subvolumes, use present behaviour
* if subvolumes exist
- install btrfs-progs udeb
- use btrfs subvol list to read subvols
- present a menu
How is this currently handled for LVM? There is very little code in
"rescue" itself, and I haven't yet managed to figure out how
everything fits together.
2. Alternatively, duplicate the existing LVM code, then modify it for
btrfs.
If you could point me to whatever 'rescue' ties into for LVM support I
would be very grateful! From what I've gathered so far, "rescue"
dependency on the btrfs application is provided by the btrfs-progs udeb and
not through initramfs
Cheers,
Nicholas
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