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Testing with Nix

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9 Dec 2025
@okamis:matrix.orgokamis

Hello, Im in a pickle, im using runnixostest as an interactive playground, and in my machine nixosconfig when I set k3s.images=manyImages it slowly eats all my disk space
in the filesystem shared and xchg and then every following command just gives input/output error. How can I go about resolving this? The /tmp/shared itself is empty when I try to list its content

[root@machine:/tmp]# df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        800M     0  800M   0% /dev
tmpfs           7.9G     0  7.9G   0% /dev/shm
tmpfs           4.0G  3.4M  4.0G   1% /run
/dev/vda         49G  3.1G   44G   7% /
nix-store       196G   20G  166G  11% /nix/.ro-store
tmpfs           7.9G     0  7.9G   0% /nix/.rw-store
overlay         7.9G     0  7.9G   0% /nix/store
shared          3.2G  3.2G   36K 100% /tmp/shared
xchg            3.2G  3.2G   36K 100% /tmp/xchg
tmpfs           1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
tmpfs           7.9G  1.1M  7.9G   1% /run/wrappers
tmpfs           1.0M     0  1.0M   0% /run/credentials/getty@tty1.service
tmpfs           1.6G  4.0K  1.6G   1% /run/user/0
13:03:56
@k900:0upti.meK900 That's honestly not a thing it was designed for 13:05:03
@k900:0upti.meK900Why not set up a proper VM13:05:08
@okamis:matrix.orgokamisIts such a nice way to do proof of concepts on.13:07:05
@k900:0upti.meK900 nixos-rebuild build-vm is not nice? 13:07:56
@okamis:matrix.orgokamis I dont know I been using nix run .#packages.x86_64-linux.test.driverInteractive 13:08:45
@okamis:matrix.orgokamisI will read up on build-vm13:09:19
@k900:0upti.meK900 ... 13:12:06
@okamis:matrix.orgokamisDo you have any knowledge of the issue? using build-vm I get a 168GB /tmp/shared. What limit of runnixotest did I break?15:19:06
@okamis:matrix.orgokamis* Do you have any knowledge of the issue?, What limit of runnixotest did I break? Using. buildvm I get a 168GB /tmp/shared dir, Im guessing its a qemu thing but Im not really sure of its purpose15:20:08
@k900:0upti.meK900The test VMs have limited disk space, by design15:21:26
@okamis:matrix.orgokamisWhere can I read up on that? there is the config virtual.diskSize, but I take it its different from the /tmp/shared15:23:33
@okamis:matrix.orgokamis* Where can I read up on that? there is the config virtual.diskSize, but It doesnt affect /tmp/shared15:24:38
@k900:0upti.meK900/tmp/shared specifically is backed by a temporary directory, which is probably backed by tmpfs, which is backed by RAM15:25:39
@k900:0upti.meK900With build-vm you should not have a /tmp/shared at all unless you've configured it explicitly15:25:53
@okamis:matrix.orgokamiswith build-vm I did get a /tmp/shared, but my confusion is more why I cannot see anything in /tmp/shared, I just see it consuming disk15:27:43
@k900:0upti.meK900 See anything where? 15:28:12
@okamis:matrix.orgokamis´ls /tmp/shared´ gives me empty dir15:28:28
@okamis:matrix.orgokamis* 'ls /tmp/shared' gives me empty dir15:28:40
@k900:0upti.meK900 You might want ls -a 15:28:49
@okamis:matrix.orgokamis * 'ls -a /tmp/shared' gives me empty dir 15:28:57
@k900:0upti.meK900If it's still empty, I'm guessing this is just qemu misreporting filesystem size for shared folders15:29:14
@okamis:matrix.orgokamisthank you for sharing your wizdom, bye-bye15:30:25
11 Dec 2025
@suua:matrix.orgsuua joined the room.16:11:27
27 Oct 2022
@winterqt:nixos.devWinter (she/her) joined the room.14:32:17
@davidak:matrix.org@davidak:matrix.orgi guess everything. improve quality with any method i established the term "package tests" in the manual, i do manual tests before release, i test prs like the gui installer, i test pantheon as part of it's maintainer team, i review prs, i create automated test, i improve and extend the manual, i try to establish a vision for nixpkgs, .....14:36:31
@davidak:matrix.org@davidak:matrix.orgi professionally work in QA and our team does manual tests for release und automate testing where possible. i think that belongs in one team, to have a common goal. there can still be people that only work in one area and maybe separate chat rooms if it helps decluttering, but we should coordinate the efforts more14:42:14
@b:chreekat.netchreekat joined the room.14:46:13
@whentze:matrix.orgWanja Hentze joined the room.14:48:09
@davidak:matrix.org@davidak:matrix.orgi just do my own thing and have my own standards for quality (often too perfectionistic). i would like to have a consensus on what level of quality we work towards and a combined effort on that. maybe even policies or recommendations. it's often unclear to me what and to i do things. so i try to learn how it is done or propose something and hope the reviewers are satisfied. i got a lot of such into the manual, like "how to deprecate packages"14:49:16

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