I'm loving alpine, but I'm running into a problem that I do not know how to
solve, and no amount of googling has helped me.

I'm on v3.11.3 on a rpi1, just downloaded the release and unpacked it onto
a fresh fat32 sd card. It boots-up and stuff just works. Regular package
installation works, but when I wanted to add wireguard, it fails and I
think I understand what is happening, but I cannot seem to figure out to
solve it.

Here is the full log:

(1/1) Installing wireguard-rpi (5.4.12-r0)
ERROR: Failed to create lib/modules/5.4.12-0-rpi/extra/wireguard.ko: No
such file or directory
ERROR: wireguard-rpi-5.4.12-r0: failed to rename
lib/modules/5.4.12-0-rpi/extra/.apk.6b9f5d1b725356e84556fbab4f1ce19495578693bf92d01e
to lib/modules/5.4.12-0-rpi/extra/wireguard.ko.
Executing busybox-1.31.1-r9.trigger
Executing kmod-26-r0.trigger
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.dep.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.dep.bin.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.alias.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.alias.bin.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.softdep.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.symbols.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.symbols.bin.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.builtin.bin.2636.32472.1581276993, 301, 644): Read-only file system
depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
modules.devname.2636.32472.1581276993, 301, 644): Read-only file system
1 error; 135 MiB in 57 packages


if I understand correctly, it wants to add a kernel module but fails since
the kernel is on a read-only side of the system. I've tried remounting the
whole disk as rw, but that didn't solve it.

I'm hoping someone can help me or maybe there is a wiki page I missed, but
it looks like this should work, is the plain alpine-rpi install and the
plain precompiled wireguard-rpi package.

Thanks,
Davy

On 2020-02-10 10:44:16, Davy Landman wrote:
> if I understand correctly, it wants to add a kernel module but fails since
> the kernel is on a read-only side of the system. I've tried remounting the
> whole disk as rw, but that didn't solve it.

Can you provide us with the output of "cat /proc/mounts"? Are you able
to install other packages than kernel modules?

Cheers,
-- 
Marco Dickert
marco@misterunknown.de
https://misterunknown.de

indeed, other packages are no problem. just to be clear, I followed these
instructions: https://wiki.alpinelinux.org/wiki/Raspberry_Pi#Installation


$ 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=10240k,nr_inodes=53900,mode=755 0 0
devpts /dev/pts devpts
rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
shm /dev/shm tmpfs rw,nosuid,nodev,noexec,relatime 0 0
/dev/mmcblk0p1 /media/mmcblk0p1 vfat
ro,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro
0 0
tmpfs / tmpfs rw,relatime,mode=755 0 0
tmpfs /run tmpfs rw,nodev,relatime,size=44376k,mode=755 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

Cheers,
Davy



On Tue, Feb 11, 2020 at 8:47 AM Marco Dickert <marco@misterunknown.de>
wrote:

> On 2020-02-10 10:44:16, Davy Landman wrote:
> > if I understand correctly, it wants to add a kernel module but fails
> since
> > the kernel is on a read-only side of the system. I've tried remounting
> the
> > whole disk as rw, but that didn't solve it.
>
> Can you provide us with the output of "cat /proc/mounts"? Are you able
> to install other packages than kernel modules?
>
> Cheers,
> --
> Marco Dickert
> marco@misterunknown.de
> https://misterunknown.de
>

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 – 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= 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
> 
> 
> $ 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=10240k,nr_inodes=53900,mode=755 0 0
> devpts /dev/pts devpts
> rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
> shm /dev/shm tmpfs rw,nosuid,nodev,noexec,relatime 0 0
> /dev/mmcblk0p1 /media/mmcblk0p1 vfat
> ro,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro
> 0 0
> tmpfs / tmpfs rw,relatime,mode=755 0 0
> tmpfs /run tmpfs rw,nodev,relatime,size=44376k,mode=755 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

-- 
Marco Dickert
marco@misterunknown.de
https://misterunknown.de

I'm having the same problems and I have tested so far with

- PXE Booted Alpine (using 
https://blog.haschek.at/2019/build-your-own-datacenter-with-pxe-and-alpine.html
)
- RasPi 3 and 4 (using 
https://wiki.alpinelinux.org/wiki/Raspberry_Pi#Installation)
- USB booted (using 
https://wiki.alpinelinux.org/wiki/Create_a_Bootable_USB)
- Full disk install on a Server

Only the last method allowed me to install the wireguard packages. I
went to the IRC a few days ago and someone said they're preparing a
method that will allow diskless setups to install these modules but I
didn't get a hold of the guy in charge.

Does anyone have any updates on this matter?


Am Montag, den 10.02.2020, 10:44 +0100 schrieb Davy Landman:
> I'm loving alpine, but I'm running into a problem that I do not know
> how to solve, and no amount of googling has helped me.
> 
> I'm on v3.11.3 on a rpi1, just downloaded the release and unpacked it
> onto a fresh fat32 sd card. It boots-up and stuff just works. Regular
> package installation works, but when I wanted to add wireguard, it
> fails and I think I understand what is happening, but I cannot seem
> to figure out to solve it.
> 
> Here is the full log:
> 
> (1/1) Installing wireguard-rpi (5.4.12-r0)
> ERROR: Failed to create lib/modules/5.4.12-0-rpi/extra/wireguard.ko:
> No such file or directory
> ERROR: wireguard-rpi-5.4.12-r0: failed to rename lib/modules/5.4.12-
> 0-rpi/extra/.apk.6b9f5d1b725356e84556fbab4f1ce19495578693bf92d01e to
> lib/modules/5.4.12-0-rpi/extra/wireguard.ko.
> Executing busybox-1.31.1-r9.trigger
> Executing kmod-26-r0.trigger
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.dep.2636.32472.1581276993, 301, 644): Read-only file system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.dep.bin.2636.32472.1581276993, 301, 644): Read-only file
> system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.alias.2636.32472.1581276993, 301, 644): Read-only file system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.alias.bin.2636.32472.1581276993, 301, 644): Read-only file
> system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.softdep.2636.32472.1581276993, 301, 644): Read-only file
> system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.symbols.2636.32472.1581276993, 301, 644): Read-only file
> system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.symbols.bin.2636.32472.1581276993, 301, 644): Read-only file
> system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.builtin.bin.2636.32472.1581276993, 301, 644): Read-only file
> system
> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
> modules.devname.2636.32472.1581276993, 301, 644): Read-only file
> system
> 1 error; 135 MiB in 57 packages 
> 
> 
> if I understand correctly, it wants to add a kernel module but fails
> since the kernel is on a read-only side of the system. I've tried
> remounting the whole disk as rw, but that didn't solve it.
> 
> I'm hoping someone can help me or maybe there is a wiki page I
> missed, but it looks like this should work, is the plain alpine-rpi
> install and the plain precompiled wireguard-rpi package.
> 
> Thanks,
> Davy

Had this problem too, and came up with a (hacky) solution. Hopefully, 
now that Wireguard is officially part of the kernel since a few months 
ago, this will not be needed in the future. But for now, the following 
does the trick:

# Remount kernel module dir /.modloop as an overlay, to allow writing
modprobe overlay
mkdir -p /.modloop.lower /.modloop.upper /.modloop.workdir
mount /dev/loop0 /.modloop.lower
umount /.modloop/
mount -t overlay -o 
lowerdir=/.modloop.lower,upperdir=/.modloop.upper,workdir=/.modloop.workdir 
none /.modloop
lbu include /.modloop.upper
lbu commit -d

# Manually get the Wireguard kernel module to avoid installing
# the wireguard-rpi2 which does not work with diskless systems
cd /tmp
pkgname=$(apk list | grep wireguard-rpi2 | cut -d " " -f 1)
wget http://dl-cdn.alpinelinux.org/alpine/v3.12/community/armhf/$pkgname.apk
mkdir /tmp/$pkgname
tar -xzf $pkgname.apk -C /tmp/$pkgname
mkdir -p /lib/modules/$(uname -r)/extra/
cp /tmp/$pkgname/lib/modules/$(uname -r)/extra/wireguard.ko \
   /lib/modules/$(uname -r)/extra/
rm -fr /tmp/$pkgname /tmp/$pkgname.apk
depmod

# Create an init script to remount the /.modloop overlay on next boot
cat > /etc/init.d/modloopoverlay <<EOF
#!/sbin/openrc-run

depend() {
     before networking
     need modules
}

start() {
     ebegin "Starting modloop overlay"
     modprobe overlay
     mkdir -p /.modloop.lower /.modloop.upper /.modloop.workdir
     if [ ! -d /.modloop.lower/modules ]; then
         mount /dev/loop0 /.modloop.lower
     fi
     umount /.modloop
     mount -t overlay -o 
lowerdir=/.modloop.lower,upperdir=/.modloop.upper,workdir=/.modloop.workdir 
none /.modloop
     eend 0
}
EOF
chmod +x /etc/init.d/modloopoverlay
/etc/init.d/modloopoverlay restart
rc-update add modloopoverlay boot
lbu include /etc/init.d/modloopoverlay
lbu commit -d





On 2/24/20 9:14 AM, Christian Haschek wrote:
> I'm having the same problems and I have tested so far with
> 
> - PXE Booted Alpine (using
> https://blog.haschek.at/2019/build-your-own-datacenter-with-pxe-and-alpine.html
> )
> - RasPi 3 and 4 (using
> https://wiki.alpinelinux.org/wiki/Raspberry_Pi#Installation)
> - USB booted (using
> https://wiki.alpinelinux.org/wiki/Create_a_Bootable_USB)
> - Full disk install on a Server
> 
> Only the last method allowed me to install the wireguard packages. I
> went to the IRC a few days ago and someone said they're preparing a
> method that will allow diskless setups to install these modules but I
> didn't get a hold of the guy in charge.
> 
> Does anyone have any updates on this matter?
> 
> 
> Am Montag, den 10.02.2020, 10:44 +0100 schrieb Davy Landman:
>> I'm loving alpine, but I'm running into a problem that I do not know
>> how to solve, and no amount of googling has helped me.
>>
>> I'm on v3.11.3 on a rpi1, just downloaded the release and unpacked it
>> onto a fresh fat32 sd card. It boots-up and stuff just works. Regular
>> package installation works, but when I wanted to add wireguard, it
>> fails and I think I understand what is happening, but I cannot seem
>> to figure out to solve it.
>>
>> Here is the full log:
>>
>> (1/1) Installing wireguard-rpi (5.4.12-r0)
>> ERROR: Failed to create lib/modules/5.4.12-0-rpi/extra/wireguard.ko:
>> No such file or directory
>> ERROR: wireguard-rpi-5.4.12-r0: failed to rename lib/modules/5.4.12-
>> 0-rpi/extra/.apk.6b9f5d1b725356e84556fbab4f1ce19495578693bf92d01e to
>> lib/modules/5.4.12-0-rpi/extra/wireguard.ko.
>> Executing busybox-1.31.1-r9.trigger
>> Executing kmod-26-r0.trigger
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.dep.2636.32472.1581276993, 301, 644): Read-only file system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.dep.bin.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.alias.2636.32472.1581276993, 301, 644): Read-only file system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.alias.bin.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.softdep.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.symbols.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.symbols.bin.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.builtin.bin.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> depmod: ERROR: openat(/lib/modules/5.4.12-0-rpi,
>> modules.devname.2636.32472.1581276993, 301, 644): Read-only file
>> system
>> 1 error; 135 MiB in 57 packages
>>
>>
>> if I understand correctly, it wants to add a kernel module but fails
>> since the kernel is on a read-only side of the system. I've tried
>> remounting the whole disk as rw, but that didn't solve it.
>>
>> I'm hoping someone can help me or maybe there is a wiki page I
>> missed, but it looks like this should work, is the plain alpine-rpi
>> install and the plain precompiled wireguard-rpi package.
>>
>> Thanks,
>> Davy