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nix-daemon.conf.in: add tmpfiles file to create nix/daemon-socket directory

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nix-daemon.socket is used to socket-activate nix-daemon.service when
/nix/var/nix/daemon-socket/socket is accessed.

In container usecases, sometimes /nix/var/nix/daemon-socket is
bind-mounted read-only into the container.

In these cases, we want to skip starting nix-daemon.socket.

However, since systemd 250, `ConditionPathIsReadWrite` is also not met
if /nix/var/nix/daemon-socket doesn't exist at all. This means, a
regular NixOS system will skip starting nix-daemon.socket:

> [  237.187747] systemd[1]: Nix Daemon Socket was skipped because of a failed condition check (ConditionPathIsReadWrite=/nix/var/nix/daemon-socket).

To prevent this from happening, ship a tmpfiles file that'll cause the
directory to be created if it doesn't exist already.

In the case of NixOS, we can just add Nix to `systemd.tmpfiles.packages`
and have these files picked up automatically.
This commit is contained in:
Florian Klink 2022-03-17 22:59:43 +01:00
parent 6afc361798
commit d60f3cf6e9
2 changed files with 3 additions and 1 deletions
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3
misc/systemd/local.mk
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@ -1,7 +1,8 @@
ifdef HOST_LINUX
$(foreach n, nix-daemon.socket nix-daemon.service, $(eval $(call install-file-in, $(d)/$(n), $(prefix)/lib/systemd/system, 0644)))
$(foreach n, nix-daemon.conf, $(eval $(call install-file-in, $(d)/$(n), $(prefix)/lib/tmpfiles.d, 0644)))
clean-files += $(d)/nix-daemon.socket $(d)/nix-daemon.service
clean-files += $(d)/nix-daemon.socket $(d)/nix-daemon.service $(d)/nix-daemon.conf
endif

1
misc/systemd/nix-daemon.conf.in Normal file
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@ -0,0 +1 @@
d @localstatedir@/nix/daemon-socket 0755 root root - -