forked from DGNum/liminix
think
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Daniel Barlow
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151
THOUGHTS.txt
151
THOUGHTS.txt
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@ -4412,3 +4412,154 @@ it can know what to update
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Maybe config.filesystem should specify /etc/s6-rc/compiled.new
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and something in early boot could symlink /etc/s6-rc/compiled to it
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Sat Mar 30 18:41:14 GMT 2024
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soft restart doesn't restart services that are invoked by trigger,
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because it has to do -p -u default so that it prunes services that
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were in the old config but not the new one. Ideally we need somehow
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to notify the trigger that it should respawn its service. Maybe
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we could add triggers to the force restart list, if there's a way
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to detect which they are? don't want to do it by adding files in
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the service state directory if there may be oneshot triggers. Can
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there be oneshot triggers?
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The hashes file is built when we build the service database, so we
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could easily(?) add something in there to mark services that
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need poking whenever there's a restart. It's not perfect because the
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triggered services will be bounced unnecessarily, but remember that
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the alternative is a reboot ...
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Mon Apr 1 00:18:50 BST 2024
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i) I don't know if digressing into remote log shipping is a tangent or
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an important part of making services work well.
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ii) Should there be a single "machine state" value for all of the
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trigger services to reference, or is it better that each trigger
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service has its own private state, or (third option) one state
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per "state source"? We previously handwaved that a state source
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is a service
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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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Tue Apr 2 19:55:25 BST 2024
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We could do a test script for udev usb disk mounting, which uses the
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qemu monitor to add/remove a disk.
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./result/run.sh --flag -device --flag usb-ehci,id=xhci --flag -drive --flag if=none,id=usbstick,format=raw,file=./stick.img
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(qemu) device_add usb-storage,bus=xhci.0,drive=usbstick
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Fri Apr 5 17:11:46 BST 2024
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1) write a fennel thing that reads from the udev rebroadcast socket
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2) and can check sysfs for state
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3) set up mdevd in liminix
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Sat Apr 6 13:23:02 BST 2024
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I wonder if we could replace preinit with an execline script? One for
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the TODO stack
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Sun Apr 7 14:03:29 BST 2024
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1) we want to know what messages are sent from mdevd under various circumstances
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- actually, right now the only relevant circumstances are updown and inout
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2) we might get a wider variety of messages from real hardware?
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3) if we log the raw messages, pref. with timestamps, then we can
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write tests for the parsing
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therefore: write a program that opens the netlink socket and logs
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all data received
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----
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what's the minimum we need here? we need the inout test to open a
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uevent socket and use uevents to update some state that says whether the
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backup drive is plugged in
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rather awkwardly, uevents don't have filesystem labels. so we also need
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to run blkid to find the label of each partition, and ideally we do this
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while the partition is present, not each time we get an event for it.
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We have DEVNAME, DEVTYPE, SUBSYSTEM to indicate that a filesystem of interest
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may be present, we should use that as a trigger to scan any known
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add@/devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1:1.0/host0/target0:0:0/0:0:0:0/block/sda/sda1
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ACTION=add
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DEVPATH=/devices/pci0000:00/0000:00:13.0/usb1/1-1/1-1:1.0/host0/target0:0:0/0:0:0:0/block/sda/sda1
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SUBSYSTEM=block
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MAJOR=8
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MINOR=1
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DEVNAME=sda1
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DEVTYPE=partition
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DISKSEQ=2
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PARTN=1
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SEQNUM=1528
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Some disks on loaclhost and noetbook have PARTNAME field - I assume
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this is because they're GPT disks. Would it actually be better to use this
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field than grovelling for filesystem label?
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Tue Apr 9 21:07:50 BST 2024
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Having waited for the appropriately labelled disk to appear, we then
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also have to communicate its path to the service that mounts it
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- create a symlink
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- or use an instanced service
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Creating a symlink will be fine if we can pass the symlink name as
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a param to fswait
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Wed Apr 10 20:53:48 BST 2024
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We think that fswait will evolve into a more general
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waiting-for-uevents tool. Maybe we could provide the matchers on the
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command line:
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waituevent -l /dev/volumes/backup-disk -s mount-srv devtype=partition partname=backup-disk
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Thu Apr 11 23:09:43 BST 2024
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lcommit d3a2e3a4cb80b631df2ab79d463c2c4d1adef37b
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commit 4a58cf9335116ce673fcf08f70f3bca921a4c9ad
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commit afca6d4b63dd39062f02827b3c29e16904770216
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Sun Apr 14 19:50:27 BST 2024
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how to get this on to main:
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- make uevent-watcher package (it's fswait renamed)
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- make mount service use it
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- module for mdevd
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- add nellie (generalise for other netlink uses w/params pid/family/groups)
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Mon Apr 15 19:59:43 BST 2024
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plan:
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introduce uevent-watcher command, update test to use it
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make mount service use it
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