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Subject: Re: [alpine-user] Squashfs root filesystem
From: Lars-Erik Helander <lehswe@icloud.com>
In-Reply-To: <f85403e8-c34e-d0d5-0336-aaa4078bb2aa@h6g.de>
Date: Fri, 7 Jun 2019 16:34:42 +0200
Cc: alpine-user@lists.alpinelinux.org
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Message-Id: <261DA982-9DC8-48F2-99C3-16953A511A3F@icloud.com>
References: <DE57F37A-E9CE-43F1-ABBA-AB0305822831@icloud.com> <f85403e8-c34e-d0d5-0336-aaa4078bb2aa@h6g.de>
To: Paul Zillmann <p.zillmann@h6g.de>

Hi Paul,

thank you very much for the hints :)

/Lars

Skickat fr=C3=A5n min iPhone

> 7 juni 2019 kl. 16:27 skrev Paul Zillmann <p.zillmann@h6g.de>:
>=20
> Hello Lars-Erik,
>=20
>> Am 07.06.19 um 12:40 schrieb Lars-Erik Helander:
>> Is it possible to configure boot to run alpine using a read-only mounted s=
quashfs file?
>=20
> Yes it is, supposing the Kernel and initramfs are not part of the squashfs=
 file.
> Take a look at [1] if the Kernel arguments work for you.
>=20
> Otherwise you can modify the init script here:
>     - mount the fs where the squashfs lies
>     - mount the squashfs
>     - mount a tmpfs
>     - mount an overlayfs as the new root, lower dir would be squashfs, upp=
er dir is the tmpfs
> The scipt is located at /usr/share/mkinitfs/initramfs-init
> Important parts at this section is "nlplug-findfs" and "exec /bin/busybox s=
witch_root" to exit the initramfs into the bootet system. (You can replace t=
he code in lines 479-490 as present in the linked repository)
>=20
> Don't forget do add the squashfs and overlayfs Kernel modules into the ini=
tramfs, then regenerate the initramfs.
>=20
> You should also take a look into the Alpine Netboot which uses modloop ins=
tead of squashfs.
>=20
> 1: https://git.alpinelinux.org/mkinitfs/tree/initramfs-init.in#n455
>=20
> - Paul
>=20
>>=20
>> The mkinit code seems to include some squashfs support, but I can not fig=
ure if that could be used for my purpose.
>>=20
>> /Lars
>>=20
>> Skickat fr=C3=A5n min iPhone
>>=20
>>=20
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>>=20
>=20
>=20
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>=20



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