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From: Michael Olbrich <m.olbrich@pengutronix.de>
To: "Jan Lübbe" <jlu@pengutronix.de>
Cc: distrokit@pengutronix.de, Roland Hieber <rhi@pengutronix.de>
Subject: Re: [DistroKit] [PATCH 7/8] rauc: add initial support
Date: Thu, 2 Mar 2023 17:09:21 +0100	[thread overview]
Message-ID: <20230302160921.GS11792@pengutronix.de> (raw)
In-Reply-To: <f5e872a116bd4f788cc668469b40c2b0f3a38d40.camel@pengutronix.de>

Hi,

On Thu, Mar 02, 2023 at 11:34:53AM +0100, Jan Lübbe wrote:
> On Thu, 2023-03-02 at 10:41 +0100, Roland Hieber wrote:
> > On Mon, Feb 13, 2023 at 08:37:25AM +0100, Jan Lübbe wrote:
> > > On Sun, 2023-02-12 at 23:14 +0100, Roland Hieber wrote:
> > > > +++ b/projectroot/etc/rauc/system.conf
> > > > @@ -0,0 +1,16 @@
> > > > +[system]
> > > > +compatible=@RAUC_BUNDLE_COMPATIBLE@
> > > > +bootloader=barebox
> > > > +
> > > 
> > > Please disable support for plain bundles.
> > 
> > ACK.
> > 
> > > Also, add a rauc data directory on the data partition so that we can use
> > > adaptive updates and keep a global slot status file.
> > 
> > Okay, this turned out to be a bit more involved, because although there
> > is a data partition, it currently not mounted, because there is no mount
> > unit for it and also no fstab entry, and it also there's no file system
> > on it because systemd-autoformat@mmcblk3.service fails to run because
> > mkfs cannot find the partition because after the previous steps which
> > resize the partition to fill the maximum space on the SD card result in
> > the partition table needing to be re-read by the kernel, which fails
> > because the rootfs from the same block device is already mounted.
> > 
> > And that is my current yak shaving status… I think the 'correct' way to
> > do this would be using systemd-repart [1] before the rootfs is mounted
> > (but maybe we need an initrd for that…? not sure…), or simply use the
> > existing 512 MB data partition generated by genimage and let the user
> > resize it manually when needed.
> > 
> > [1]: https://www.freedesktop.org/software/systemd/man/systemd-repart.html
> 
> On the LXA TAC we currently use systemd-repart for this:
> https://github.com/linux-automation/meta-lxatac/tree/langdale/meta-lxatac-bsp/recipes-core/lxatac-repart
> 
> We use it from the running system (not initramfs).

Userspace can change the partition layout manually. systemd-repart does
this internally via fdisk_reread_changes(). That in turn calls the BLKPG
ioctl. So with the right tool you can resize a partition at runtime even if
it's on the same device as the root partition.

Michael

-- 
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  reply	other threads:[~2023-03-02 16:09 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-12 22:14 [DistroKit] [PATCH 0/8] v7a: add redundant update support via RAUC Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 1/8] rauc-udev: add a compatibility layer for mapping partitions Roland Hieber
2023-02-13  9:43   ` Michael Olbrich
2023-03-02  9:33     ` Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 2/8] v7a: add RAUC support for qemu-vexpress Roland Hieber
2023-03-08  9:33   ` Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 3/8] v7a: add RAUC support for beaglebone black Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 4/8] v7a: add RAUC support for rpi3 Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 5/8] v7a: add RAUC support for riotboard Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 6/8] v7a: kernel: enable features necessary for RAUC Roland Hieber
2023-02-13  7:33   ` Jan Lübbe
2023-02-12 22:14 ` [DistroKit] [PATCH 7/8] rauc: add initial support Roland Hieber
2023-02-13  7:37   ` Jan Lübbe
2023-03-02  9:41     ` Roland Hieber
2023-03-02 10:34       ` Jan Lübbe
2023-03-02 16:09         ` Michael Olbrich [this message]
2023-03-08  9:45           ` Roland Hieber
2023-02-12 22:14 ` [DistroKit] [PATCH 8/8] v7a: enable RAUC bundle creation Roland Hieber
2023-02-13  7:42   ` Jan Lübbe
2023-04-25 18:38     ` Roland Hieber
2023-02-13  7:48 ` [DistroKit] [PATCH 0/8] v7a: add redundant update support via RAUC Marco Felsch
2023-02-13  9:35   ` Roland Hieber
2023-03-07 12:04 ` Ahmad Fatoum
2023-03-08 10:11   ` Roland Hieber

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