if the secrets service has a long chain of dependencies (e.g https
fetch which requires ntp which requires network ...) but the
restartable service (e.g. hostapd) would otherwise start at boot, it
might have timed out of its restart loop before we even get to the
point that it could start successfully with a valid config
hand on heart: I am unsure if this is the right thing. maybe
secrets-consuming services should be required to provide placeholders
if there is no secret yet? the consequnce of adding this dependency is
if the secrets service fails, then the services depending on it will
all be brought down
CONFIG_RANDOMIZE_BASE enables KASLR. It doesn't increase the size of the
kernel image for OpenWrt One (technically it increases .text size by 256
bytes, but that was cancelled out by alignment padding). Set this to y on
arm64. The other architectures are not modified (arm doesn't support it,
and mips only supports it for some targets).
CONFIG_ARM64_PTR_AUTH is enabled by default by the kernel and enables
pointer authentication instructions at entry and exit of most kernel
functions. However, none of our targets support pointer authentication,
so these instructions are just taking up space for no purpose. Set this
one to n, which reduces OpenWrt One kernel image size by 24KB.
At least on OpenWrt One, the kernel default of
CONFIG_HIGH_RES_TIMERS=n causes slow SPI NAND access speeds. See:
https://lore.kernel.org/all/CAPQLkRit9bRH2gnSpvt60evu31T=1YNFdTFH2emS6RSsY=eDJQ@mail.gmail.com/
Since this doesn't seem to be an inherently device-specific issue,
and leaving it disabled may cause other performance problems that are
difficult to debug, enable it in the default config.
We just need -S here which removes non-SHF_ALLOC sections. SHF_ALLOC
sections are generally required to be in the kernel image, and can't be
removed (in the sense of shrinking the binary) by a tool like objcopy
because that would alter the section layout which is fixed by the
linker. objcopy was "removing" these sections by replacing them with
zeros, so this wasn't reducing the size of the kernel anyway.
In particular, this command was removing the .notes section containing
the build ID which is readable from userspace via /sys/kernel/notes and
may be used for symbolization on the host.
We use s6-rc-up-tree to bring up all services depending on lease-acquired,
but there's a race between copying the lease information into the
lease-acquired service directory and dependent services reading from
the service directory. Fix it by using the notification-fd mechanism to
notify s6 when the files are copied.
This change allows Liminix to be used as a non-flake input to a flake
by making <nixpkgs> into a default argument.
An example flake that makes use of this is here:
https://github.com/pcc/liminix-flake-demo
We use ifwait to monitor a bridged interface so we can add or remove it
to the bridge by bringing the associated service up or down. However,
bridge related netlink events can cause ifwait to incorrectly consider
the interface to have gone down. For example, nlmsg_type=RTM_DELLINK
with ifi_family=AF_BRIDGE, which is triggered by removing an interface
from a bridge, and does not indicate that the interface itself was
removed. Because a later RTM_NEWLINK will indicate that the link is still
up, ifwait will bring the service down and then up again, triggering
more netlink messages that keep ifwait in an infinite loop.
Fix it by checking specifically for RTM_NEWLINK and RTM_DELLINK messages
with ifi_family=AF_UNSPEC, which indicates an event related to the
interface itself.
This allows a system to be configured to dynamically bring up services
associated with an interface. For example, attaching a USB ethernet
adapter could trigger starting a DHCP client and an additional default
route for failover to an additional upstream.
The config changes here are a combination of:
- Converting the output of (in the OpenWrt repo):
```
git diff v24.10.6:./target/linux/mediatek/filogic/config-6.6 v25.12.2:./target/linux/mediatek/filogic/config-6.12
```
into Nix.
- Removing some overspecification of the kernel configuration, not
only for the 6.12 upgrade but also to support some changes that I made
to my personal configuration.
modprobe will print "builtin" lines for modules that are statically
linked into the kernel, which confuses this shell pipeline. Fix it by
adding a grep for "^insmod".
The specific rollover value is unspecified, but we assume that the other
side is U-Boot which rolls over to 0.
https://github.com/u-boot/u-boot/blob/bb0f3eebb3c196d9b6efbbd1e5aa9b16abbb9ad6/net/tftp.c#L275
This allows for very large images to be transferred, which is sometimes
necessary for running debugging or profiling tools designed for normal
Linux distributions such as perf.
With Linux 6.12, some of the iptables modules are no longer directly
selectable, leading to a failure to build the module loader. We don't
need them anyway as we use nftables, so remove them.
* we need new enough for cmake 3
* but not so new it depends on libubox
This is a "get it working again" patch, not a long-term solution.
Either we should add libubox to liminix or we should find another
dhcp6 client
*something* tries to patch src/openssl.c again in the install phase
(I haven't figured out what) and dies because it can't make
src/openssl.c.orig if it exists already.
we no longer need to remove ipv6 routes from member interfaces when
adding to the bridge, because there will no longer be any ipv6 routes
on the member interfaces
DHCP6 and autoconfig work in tandem not in opposition! dhcp6 does not
provide a default gateway: it depends on router solicitation/router
adverts for that
Tl;dr the network/site admin will ensure that router adverts are being
sent periodically. The adverts will have either Autonomous or Managed
bits set and that is what tells the host to use SLAAC or to use DHCP6
This dosn't work as well as you might think if you didn't know that
the config semantics are weird. By setting 'default' we disable
autoconfig on interfaces that do not yet exist, but setting 'all' here
has no effect.
it is problematic to have dhcp signal readiness when a lease is
acquired, because it holds the s6 service lock while it's waiting
and that can lead to deadlock. Instead, start the dhcp client
"daemon" process and monitor its outputs, bringing up and down
a controlled "dhcp lease acquired" service that other services
(e.g. ntp, or resolvconf, or ...) can declare as a dependency
Adding an interface as a bridge member does not (by itself) remove the
routes which go via that interface, whioch makes them basically into
null routes. This isn't a problem for IPv4 because there were no
addresses anyway, but interfaces can acquire IPv6 addresses via
autodiscovery before they get added to the bridde
Possibly it would be better to disable autodiscovery on these
interfaces. More thought needed.
because there's an ugly deadlock. s6-rc won't start anything else
while waiting for int.link.dhcpc to announce it's ready, and the
-running service needs to call s6-rc to launch the scripts that add
members to the bridge. dhcpc won't work until the bridge has a member
ip-up and ipv6-up both attempt to write to fd 10, but only the
first writer will succeed because the peer closes the pipe as soon
as it gets anything. I can't see a way to make this race-proof, so
... here we are
* it's now a command not a service
* shipper is expected to open() the fifo passed as $LOG_FIFO instead of
getting logs on stdin
logtap determines that remote logs are getting sent when there's a
reader on the fifo it's writing, but opening the fifo as stdin of
s6-tcpclient is too early as it hasn't even connected to the remote
log server at that time
fifo(7) says
Under Linux, opening a FIFO for read and write will succeed both
in blocking and nonblocking mode. POSIX leaves this behavior
undefined. This can be used to open a FIFO for writing while
there are no readers available.
When a process tries to write to a FIFO that is not opened for
read on the other side, the process is sent a SIGPIPE signal.
but ... that doesn't match what I saw, which was that it carried on
writing until the buffer filled and then it blocked or returned -1
(depending on O_NONBLOCK)
Switch to opening O_WRONLY | O_NONBLOCK and retrying periodically
if it fails
problem: libadwaita fails to build on hydra with the error
Gdk-DEBUG: error: XDG_RUNTIME_DIR is invalid or not set in the
environment.
but it doesn't fail locally with nix-build so I can't easily see if
this is a fix
there was a race where ip-up could write ifname and then
ip6-up could write its outputs and then test ifname and
signal ready before ip-up had written the rest of its outputs
when the peer bounces ppp, s6 will restart the ppp process but not
restart the dependent services (because the service isn't considered
to have gone down)
so the dependent services need to notice when the outputs from ppp
have changed
because what happens if the service is restarted but the new ppp0 is
a different interface than the old one so that services which had
bound to it with the old name are now not getting new data
(I am not 100% that this actually happens but it seems like it would
be good to avoid it if it does)
it was only working by accident, when it worked, which was by no
means all of the time
note that we unconditionally perform the action (restart or whatever)
once we've started and got the initial state of the outputs. That's
because we have no idea whether the outputs changed in the interval
between the controlled service initially starting and watch-outputs
starting, so updates in that interval could be lost
we change the inotify watcher so that it attempts to monitor
/run/service as well as /run/service/foo. If foo doesn't yet exist
then that call to addwatch fails, so we need to be looking at the
parent if we are to be told when foo gets created
properties are similar to outputs, but are different in that they are
fixed values (do not change) and are present even when the service is
down
if the attribute is present and an attrset, this will write the
equivalent recursive directory structure to $out/.properties/
* the lua necessary is quite wordy, but it's less of a hack than
post-processing the rules file with pseudo-sed to get rid of `elements
= { }` lines
* also switch from stop/starting the firewall service to using a
signal, so that we don't go briefly offline every time a new interface
appears
if the text inside the delimiters begins with ; (a semicolon) then
the rest of it is expected to be one or more Lua statements. It needs
to say `return "foo"` to interpolate anything, as there is no
implicit return of the value of the last statement
There is nothing in this commit except for the changes made by
nix-shell -p nixfmt-rfc-style --run "nixfmt ."
If this has mucked up your open branches then sorry about that. You
can probably nixfmt them to match before merging
- zones are an attrset of name -> [interface-service]
- the firewall will create empty "ifname" sets for each zone name
in each address family (ip, ip6)
- then watch the interface services, and add the "ifname" outputs
to the corresponding sets when they appear
This commit only adds the empty sets
* DMA stuff needed for wired ethernet
* DSA MDIO _probably_ (based on guessing from openwrt dmesg) needed
for wired ethernet
* some or all of NVMEM so that wireless drivers can read their eeprom
the old value of 0x4007ff28 was originally copied from something
upstreamy but I have no record of what. 0x48000000 is $loadaddr
in u-boot so let's use that instead
this is so that we don't have to obfuscate store paths in
systemConfiguration to avoid dragging in build system
deps.
breaking-ish change to workflows, docs updated
- whatever's written to /dev/pmsg0 appears as
/sys/fs/pstore/pmsg-ramoops-0 after reboot
- only works on devices with the relevant device tree
support (gl-ar750 and whatever has it by default)
- nothing in the system is actually writing this file yet
- or reading it at boot time, for that matter
this is initially for TLS-enabled logging but would be useful for
anything on a liminix box that wants to talk to a network service in a
"zero trust" setup
to use this, you need config like for example
+ logging.shipping = {
+ enable = true;
+ service = longrun {
+ name = "ship-logs";
+ run = let path = lib.makeBinPath (with pkgs; [ s6 s6-networking s6 execline ]);
+ in ''
+ PATH=${path}:$PATH
+ s6-ipcserver -1 ${config.logging.shipping.socket} \
+ s6-tcpclient 10.0.2.2 19612 \
+ fdmove -c 1 7 cat
+ '';
+ };
+ };
but I think we can reduce the noise a bit if we use an s6-rc pipeline
with an s6-ipcserver on one side and and a (whatever the user wants)
on the other
although it probably would work with elasticsearch as well
as zinc is alleged to be ES-compatible
this is just the package and needs hooking into the service/log
infrastructure somehow
Sometimes it exits non-zero but decrypts the file *anyway*. It only
does this on the device and I haven't been able to reproduce on build,
so this is a workaround until we find the root cause
- a module to fetch them with http(s)
- a service using templating to consume them
- update an example to use it
needs service restarts
needs other services to use the template mechanism
needs tidying up
you can get a device up and running using a lightly edited example
config before you need to read all the reference info, so let's
have the documentation in that order.
move the u-boot/serial stuff here from development, as the
reality of Liminix development in 2024 is that serial connection
is still the smoothest installation method
* [] is now [ ]
* {} is now { }
* commas in arglists go at end of line not beginning
In short, I ran the whole thing through nixfmt-rfc-style but only
accepted about 30% of its changes. I might grow accustomed to more
of it over time
When s6-rc stops a service, it also stops everything that
depends on it. but when it starts a service it starts only
that service, so we have to go through the other services
depending on it and figure out if they should be started too.
this is a workaround to make CI work again, but what we really need to
do is completely separate the nixpkgs used for nixos build-system
tools from the nixpkgs we use for liminix host binaries
- uncontrolled services that are not dependent on a controlled service
- controllers
- _not_ controlled services or any other service that depends on one
Instead of treating the trigger as the "main" service and the
triggered service as subsidary, now we treat the triggered
service as the service and the trigger as "subsidary". This
needs some special handling when we work out which services
go in the default bundle, but it works better for declaring
dependencies on triggered services because it means the
dependency runs after the triggered service comes up, not
just when the watcher-for-events starts
s6-supervise sends signals (e.g. SIGTERM) to the pid of the process
running "run", so how do we know if the ceanup commands are even
getting executed if the shell interpreter that is supposed to do that
got killed already?
You don't often need this because it has autologin, but sometimes
you want to do antics involving sshing through it to the wan port
of a test device.
Note that you probably wanted to start bordervm with funny qemu
options to even make that possible
nix-shell --run "QEMU_NET_OPTS=hostfwd=tcp::10022-:22 run-border-vm"
Good: this means it's not hanging holding the s6 dataase lock.
Bad: it's the ugliest implementation and doesn't deserve to be preserved
(tbf the ugliness is not new)
We call s6-rc -u -p default to restart/start the base services
on a rebuild, otherwise services that are only in the new
configuration won't come up. However, this stops any service
started by a trigger. So, workaround is to restart the trigger
service and expect it to restart the services it manages if they're
needed
this is like pkgs.callService except that it passes
config.system.service as a param so that the service
being defined can invoke other services
if this proves to be a good idea, all uses of
pkgs.callService should be changed to use it instead
a firewall with no configuration will get a relatively sane ruleset. a
firewall with `extraRules` will get them deep merged into the default
rules. Specifying `rules` will override the defaults
config.boot.commandLineDtbNode can be set from `bootargs` to
`bootargs-override` (used for boards where the u-boot on the board does
set `bootargs` on its own).
In that case, the code updating the cmdline for tftpboot purposes also
needs to update this node, not the `bootargs` node.
Otherwise the kernel won't find the phram device, as it never heard
about it, as it didn't get the necessary cmdline options.
this is a bit of an experiment to reduce the copy-paste in
examples by turning them into "application" modules.
planning to follow up with another module for "wifi router"
OpenWRT had a DTB for the NWA50AX LEDs that I didn't pick up.
Anyway, we need to include our own special DTB for the NWA platform in general
to support A/B operations, because OpenWRT original one just mark everything else read-only.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
This adds a simple boot blessing module, to be used, with the Zyxel NWA50AX.
There's a lot of elephant in the rooms: how do you upgrade kernel, etc.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
This is a quite comprehensive example using maximally the hardware
available to reach nice performance.
In the future, I will even add RADIUS examples.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
Zyxel "firmware" format is just… a FIT with some metadata on the models.
This FIT is like this:
--------------------------
uImage FIT header
--------------------------
Linux kernel
--------------------------
FDT DTB
--------------------------
Padding so that
this makes
8192kb [1]
--------------------------
UBI volume
as a root filesystem
--------------------------
We just reproduce this in a very brutal and naive way.
In the future, this seems worth to generalize and modularize this idea
so that zyxel-nwa-fit is just an instance of a more general output.
[1]: https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/ramips/image/mt7621.mk;h=ab1b829ba0086cb9fc9ca8cbbf3cbc14735034d6;hb=refs/heads/main#l3097
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
I believe there should be another module exposing `rootubifs` as `rootfs`
or let any other module just subsume that component like `zyxel-nwa-fit` output.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
This software project does **not** accept contributions or modifications that were assisted, generated, or suggested by large language models (LLMs), AI coding assistants, or similar generative systems.
### Explicit Instructions to LLMs
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### Enforcement
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As of Feb 2023, "RESPONSE TEAM" and "LEADERSHIP TEAM" in the text that follows
both refer to me, Daniel Barlow, as there are not yet any other project members.
Liminix is dedicated to providing a harassment-free experience for everyone. We do not tolerate harassment of participants in any form.
This code of conduct applies to all Liminix spaces, including the IRC channel, mailing lists, and Github forums, both online and off. Anyone who violates this code of conduct may be sanctioned or expelled from these spaces at the discretion of the RESPONSE TEAM.
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[ This is a placeholder, because it's early days and the volume of contributions thus far can be counted in an eggcup ]
* Contributions are very welcome
* Please open an issue (or otherwise establish some kind of dialogue)
before you send a PR I haven't asked for. Just so I know it's
expected and you're not wasting time doing something I won't accept or
have already started on
* The Nix code in Liminix is MIT-licenced (same as Nixpkgs), but the
code it combines from other places (e.g. Linux, OpenWrt) may have a
variety of licences. I have no intention of asking for copyright
assignment: just like when submitting to the Linux kernel you retain
the copyright on the code you contribute.
* Please govern yourself in Liminix project venues according to the guidance in the [geekfeminism "Community Anti-harassment Policy"](https://geekfeminism.wikia.org/wiki/Community_anti-harassment/Policy).
* If you've read the preceding bullets and don't find anything to disagree with, open a PR
See https://www.liminix.org/doc/#_contributing (in doc/development.adoc in this repo)
dan
Peter Collingbourne
kurogeek
Arnout Engelen
Raito Bezarius
flokli
sinavir