Date: Tue, 11 Feb 2020 10:18:27 +0100
From: Marco Dickert <marco@misterunknown.de>
To: Davy Landman <davy.landman@gmail.com>
Cc: ~alpine/users@lists.alpinelinux.org
Subject: Re: Installing package with kernel module fails on diskless mode?
 (wireguard-rpi)
Message-ID: <20200211091827.GB15486@marco.themis.pinknet.de>
References: <CAEhkKgV-OdZ8y406_yynrH7tcxjgXkKzSc6dCSZ_a6CUPUfBiA@mail.gmail.com>
 <20200211074745.GA15486@marco.themis.pinknet.de>
 <CAEhkKgWsh=mvm7r6ZmJsSfyZ9F=y1TuPOhoc2XF68n4P+G7h1w@mail.gmail.com>
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Disclaimer: I neither used alpine on a Raspi, nor a diskless setup at
all. I'm just trying to understand what happens.

Apparently Alpine uses a mechanism called "modloop", which specifies a
squashfs filesystem that is mounted on "/.modloop". This mountpoint is
in turn the target of the /lib/modules symlink =E2=80=93 that explains why =
apk
grouses about missing write permissions.

However, I'm not sure how you're supposed to add kernel modules. There
is this [1] wiki page which indicates, that you can set modloop=3D to an
URL which contains an image with additional kernel modules, but I'm not
sure if that is the solution of choice for your use case.

On 2020-02-11 09:29:40, Davy Landman wrote:
> indeed, other packages are no problem. just to be clear, I followed these
> instructions: https://wiki.alpinelinux.org/wiki/Raspberry_Pi#Installation
>=20
>=20
> $ cat /proc/mounts
> proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
> sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
> devtmpfs /dev devtmpfs
> rw,nosuid,relatime,size=3D10240k,nr_inodes=3D53900,mode=3D755 0 0
> devpts /dev/pts devpts
> rw,nosuid,noexec,relatime,gid=3D5,mode=3D620,ptmxmode=3D000 0 0
> shm /dev/shm tmpfs rw,nosuid,nodev,noexec,relatime 0 0
> /dev/mmcblk0p1 /media/mmcblk0p1 vfat
> ro,relatime,fmask=3D0022,dmask=3D0022,codepage=3D437,iocharset=3Dascii,sh=
ortname=3Dmixed,errors=3Dremount-ro
> 0 0
> tmpfs / tmpfs rw,relatime,mode=3D755 0 0
> tmpfs /run tmpfs rw,nodev,relatime,size=3D44376k,mode=3D755 0 0
> mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
> /dev/loop0 /.modloop squashfs ro,relatime 0 0
> debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
> configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
> tracefs /sys/kernel/debug/tracing tracefs rw,nosuid,nodev,noexec,relatime=
 0
> 0

--=20
Marco Dickert
marco@misterunknown.de
https://misterunknown.de

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