deep thoughts
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Daniel Barlow
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146
THOUGHTS.txt
146
THOUGHTS.txt
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@ -4137,3 +4137,149 @@ p-clock-init,mfp,allows-mesh-bcast crc32 62f7565f
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[ 16.762697] ath10k_pci 0000:00:00.0: pdev param 0 not supported by firmware
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[ 23.030622] ath10k_pci 0000:00:00.0: pdev param 0 not supported by firmware
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[
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Tue Feb 27 23:16:27 GMT 2024
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We made it a full week with rotuer running internet chez nous and no
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need for an intervention, so I am happy to call it "production". There are
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still things that need fixing but they're mostly within scope for
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a services refresh
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I have embarked on "profiles" by creating a wap.nix
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I think we could have a service module for resolvconf
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It would be good to build a wap.nix example for the belkin and we
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could start looking at ubifs
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I've lost a chunk of notes about using events to drive desired service
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state. There is probably only going to be one udev listener, so
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what if we have udev as a config key thusly
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udev.rules = [
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{
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match = {
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SUBSYSTEM = "rpmsg";
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ATTR.name = "DATA5_CNTL";
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};
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service = longrun {
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name = "lte-modem";
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run = "blah blah blah";
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};
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}
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# this one would be provided by the bridge module instead of
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# adding bridge member services to the default target
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{
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match = {
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SUBSYSTEM="net";
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ID_PATH="pci-0000:04:00.0";
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ATTR.operstate = "up";
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};
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service = oneshot {
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up = "ip link set dev $dev master $(output ${primary} ifname)";
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down = "ip link set dev $(output ${member} ifname) nomaster";
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}
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}
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]
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This works for udev/sysfs, but we want a similar architecture(sic) for
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user-generated target state so we could have services that run on e.g.
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"is the ppp0 service healthy" or not. Probably there isn't a top-level
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config key for each service though
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services.wan = svc.ppoe.build { .... };
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services.lte = watcher.build {
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watching = services.wan;
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match = {
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# an expression matching the outputs of the service
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# to be watched
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health = "failing";
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};
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service = oneshot {
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run = "start_lte_blah";
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};
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}
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thing is, we could use this syntax also for sysfs watches, but not vice versa
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... but it's not quite the same because here we're doing static matches
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on contents of files, whereas the udev one is a query expression on the
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sysfs database. we might need that flexibiity to implement "mount the
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backup drive no matter _which_ damn sda_n_ device it appears as". I don't
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know if there's the same need for service outputs - postulate the
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existence of a collection of services which are all similar enough that
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some other service can watch them all and do $something when one of
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the changes state. Or a single service with very complicated outputs.
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For example, something could watch the snmp database and update service
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status depending on what it finds. Or something something mqtt...
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we find that the "match" needs to be interpreted differently according
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to the thing being watched. perhaps the service being watched needs to
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provide a "watch me" interface somehow which accepts match criteria and
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outputs a true/false. Something else then needs to
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services.addmember = services.udev.watch {
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match = {
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SUBSYSTEM = "net";
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ID_PATH = "pci-0000:04:00.0";
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ATTR.operstate = "up";
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};
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service = oneshot {
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up = "ip link set dev $dev master $(output ${primary} ifname)";
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down = "ip link set dev $(output ${member} ifname) nomaster";
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};
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}
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Sat Mar 2 15:37:29 GMT 2024
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Simply put, what I think it boils down to is that we want a service
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which acts as an actuator or control switch for another service,
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and will start/stop that controlled service according to some
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criteria.
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services.addmember = svc.network.ifwatch.build {
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interface = config.hardware.networkInterfaces.lan1;
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# this should be part of the definition not the params
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service = oneshot {
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name = "member-${bridge}-${interface}";
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up = "ip link set dev $dev master $(output ${primary} ifname)";
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down = "ip link set dev $(output ${member} ifname) nomaster";
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};
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}
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we could start by writing this. we need to adapt ifwait
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Sun Mar 3 17:09:21 GMT 2024
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this is annoyingly hard to test. the tests we'd like to write are
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1) when it gets events that don't match the requirement, nothing happens
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2) when it gets an event that should start the service, the
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service starts
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3) when stop should stop
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4) when start and already started, nothing happens
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5) when stop and already stopped, nothing happens
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what do we do if service fails to start? s6-rc will eventually reset it
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to "down", I think: do we need to take action?
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Mon Mar 4 20:46:55 GMT 2024
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# relevant but not correct for this model: https://www.forked.net/forums/viewtopic.php?f=13&t=3490
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# power on port 5
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snmpset -v 1 -c private 192.168.5.14 .1.3.6.1.4.1.318.1.1.4.4.2.1.3.5 integer 1
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# power off port 5
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snmpset -v 1 -c private 192.168.5.14 .1.3.6.1.4.1.318.1.1.4.4.2.1.3.5 integer 2
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# toggle off/on port 5
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snmpset -v 1 -c private 192.168.5.14 .1.3.6.1.4.1.318.1.1.4.4.2.1.3.5 integer 3
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