readonly rootfs - storing data in separate partition

readonly rootfs - storing data in separate partition

[Belisko Marek]

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Hi,

I plan to use readonly rootfs option and store some custom data in separate
partition (like hostname, wpa_supplicant.conf etc). I have wic file which
create rootfs + then rest is for data storage. I can adjust various recipes
to symlink to /data partition. My question is if there exists some
mechanism how to store some pieces in non-rootfs partition? I know some
projects which put those extra files to deploy dir and then by dd create
dummy storage nd put files there and finally create partition from that.
Thanks a log for any pointers.

BR,

marek

-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
twitter: #opennandra
web: http://open-nandra.com

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Re: readonly rootfs - storing data in separate partition

[Marc Ferland]

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On Mon, Feb 18, 2019 at 11:37 AM Belisko Marek <marek.belisko@gmail.com>
wrote:

> Hi,
>
> I plan to use readonly rootfs option and store some custom data in
> separate partition (like hostname, wpa_supplicant.conf etc). I have wic
> file which create rootfs + then rest is for data storage. I can adjust
> various recipes to symlink to /data partition. My question is if there
> exists some mechanism how to store some pieces in non-rootfs partition? I
> know some projects which put those extra files to deploy dir and then by dd
> create dummy storage nd put files there and finally create partition from
> that. Thanks a log for any pointers.
>
>

You could potentially use overlayfs to have a RO rootfs and a separate RW
layer in another partition for example. I think linux-yocto also support
AUFS.

Good luck,

Marc

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Re: readonly rootfs - storing data in separate partition

[Joshua Watt]

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On Mon, 2019-02-18 at 17:36 +0100, Belisko Marek wrote:
> Hi,
> I plan to use readonly rootfs option and store some custom data in
> separate partition (like hostname, wpa_supplicant.conf etc). I have
> wic file which create rootfs + then rest is for data storage. I can
> adjust various recipes to symlink to /data partition. My question is
> if there exists some mechanism how to store some pieces in non-rootfs 
> partition? I know some projects which put those extra files to deploy
> dir and then by dd create dummy storage nd put files there and
> finally create partition from that. Thanks a log for any pointers.

We do this a lot using volatiles files. The best documentation is the
core volatiles file: 
https://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-core/initscripts/initscripts-1.0/volatiles id="-x-evo-selection-start-marker">
> BR,
> 
> marek
> 
-- 
Joshua Watt <JPEWhacker@gmail.com>

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Re: readonly rootfs - storing data in separate partition

[Belisko Marek]

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On Mon, Feb 18, 2019 at 5:52 PM Marc Ferland <marc.ferland@gmail.com> wrote:

> On Mon, Feb 18, 2019 at 11:37 AM Belisko Marek <marek.belisko@gmail.com>
> wrote:
>
>> Hi,
>>
>> I plan to use readonly rootfs option and store some custom data in
>> separate partition (like hostname, wpa_supplicant.conf etc). I have wic
>> file which create rootfs + then rest is for data storage. I can adjust
>> various recipes to symlink to /data partition. My question is if there
>> exists some mechanism how to store some pieces in non-rootfs partition? I
>> know some projects which put those extra files to deploy dir and then by dd
>> create dummy storage nd put files there and finally create partition from
>> that. Thanks a log for any pointers.
>>
>>
>
> You could potentially use overlayfs to have a RO rootfs and a separate RW
> layer in another partition for example. I think linux-yocto also support
> AUFS.
>
This one seems promising:
https://github.com/cmhe/meta-readonly-rootfs-overlay
This is not exactly what I was looking for but I think it can be usable.
Anyone using this? Thanks.

>
> Good luck,
>
> Marc
>

/marek

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Re: readonly rootfs - storing data in separate partition

[Belisko Marek]

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On Mon, Feb 18, 2019 at 6:05 PM Joshua Watt <jpewhacker@gmail.com> wrote:

> On Mon, 2019-02-18 at 17:36 +0100, Belisko Marek wrote:
>
> Hi,
>
> I plan to use readonly rootfs option and store some custom data in
> separate partition (like hostname, wpa_supplicant.conf etc). I have wic
> file which create rootfs + then rest is for data storage. I can adjust
> various recipes to symlink to /data partition. My question is if there
> exists some mechanism how to store some pieces in non-rootfs partition? I
> know some projects which put those extra files to deploy dir and then by dd
> create dummy storage nd put files there and finally create partition from
> that. Thanks a log for any pointers.
>
>
> We do this a lot using volatiles files. The best documentation is the core
> volatiles file:
> https://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>
Can this be used when systemd is init manager? Thanks.

>
>
> BR,
>
> marek
>
> --
>
> Joshua Watt <JPEWhacker@gmail.com>
>

BR,

/marek

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Re: readonly rootfs - storing data in separate partition

[Joshua Watt]

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On Tue, 2019-02-19 at 08:36 +0100, Belisko Marek wrote:
> On Mon, Feb 18, 2019 at 6:05 PM Joshua Watt <jpewhacker@gmail.com>
> wrote:
> > On Mon, 2019-02-18 at 17:36 +0100, Belisko Marek wrote:
> > > Hi,
> > > I plan to use readonly rootfs option and store some custom data
> > > in separate partition (like hostname, wpa_supplicant.conf etc). I
> > > have wic file which create rootfs + then rest is for data
> > > storage. I can adjust various recipes to symlink to /data
> > > partition. My question is if there exists some mechanism how to
> > > store some pieces in non-rootfs partition? I know some projects
> > > which put those extra files to deploy dir and then by dd create
> > > dummy storage nd put files there and finally create partition
> > > from that. Thanks a log for any pointers.
> > 
> > We do this a lot using volatiles files. The best documentation is
> > the core volatiles file: 
> > https://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-core/initscripts/initscripts-1.0/volatiles
> Can this be used when systemd is init manager? Thanks.

I'm pretty sure systemd processes volatiles as well, although I can't
find the exact code to point to at the moment to confirm it.
> > > BR,
> > > 
> > > marek
> > > 
> > -- 
> > Joshua Watt <JPEWhacker@gmail.com>
> 
> BR,
> 
> /marek
> 
> 
> 
-- 
Joshua Watt <JPEWhacker@gmail.com>

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readonly-rootfs-overlay

[Howard]

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Hi:

I was wondering if anybody is using meta-readonly-rootfs-overlay?

Thanks
Howard

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Re: readonly rootfs - storing data in separate partition

[Howard]

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Hi:

I was wondering if anybody is using meta-readonly-rootfs-overlay?

Thanks
Howard

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AW: [yocto] readonly-rootfs-overlay

[Matthias Klein]

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Hello Howard,

i use parts of it (without a writeable partition, just a tmpfs) in a separate layer: https://github.com/matthiasklein/meta-distro-coffee/blob/master/recipes-core/readonly-rootfs-overlay/readonly-rootfs-overlay_1.0.bb
Best regards,
Matthias
Von: yocto@lists.yoctoproject.org <yocto@lists.yoctoproject.org> Im Auftrag von Howard via lists.yoctoproject.org
Gesendet: Sonntag, 6. Februar 2022 22:14
An: yocto@lists.yoctoproject.org
Betreff: [yocto] readonly-rootfs-overlay

Hi:

I was wondering if anybody is using meta-readonly-rootfs-overlay?

Thanks
Howard

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Re: readonly rootfs - storing data in separate partition

[Marco Cavallini]

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rootfs-overlay ( https://github.com/cmhe/meta-readonly-rootfs-overlay ) is the perfect solution for your case.

--
Marco Cavallini | KOAN sas
Bergamo - Italia
embedded software engineering
https://KoanSoftware.com

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Re: readonly rootfs - storing data in separate partition

[tomzy]

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Hi

Not long ago we use it in couple of projects. Main repo can be found
here, https://github.com/cmhe/meta-readonly-rootfs-overlay

You can also find our fork with couple of changes (on of them is for example
adjustions for honister release.

--
Tomasz Żyjewski
Embedded Systems Engineer
GPG: 5C495EA3EBEECA59
https://3mdeb.com | @3mdeb_com

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