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nixos/stc: Improve mount unit handling

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We should sometimes restart the units rather than reloading them so the
changes are actually applied. / and /nix are explicitly excluded because
there was some very old issue where these were unmounted. I don't think
this will affect many people since most people use fstab mounts instead
but I plan to adapt this behavior for fstab mounts as well in the future
(once I wrote a test for the fstab thingies).
This commit is contained in:
Janne Heß 2023-08-20 11:05:46 +02:00
parent 37b8244412
commit eb831f759b
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3 changed files with 51 additions and 9 deletions
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7
nixos/doc/manual/development/unit-handling.section.md
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@ -25,8 +25,11 @@ checks:
since changes in their values are applied by systemd when systemd is
reloaded.
- `.mount` units are **reload**ed. These mostly come from the `/etc/fstab`
parser.
- `.mount` units are **reload**ed if only their `Options` changed. If anything
else changed (like `What`), they are **restart**ed unless they are the mount
unit for `/` or `/nix` in which case they are reloaded to prevent the system
from crashing. Note that this is the case for `.mount` units and not for
mounts from `/etc/fstab`. These are explained in [](#sec-switching-systems).
- `.socket` units are currently ignored. This is to be fixed at a later
point.