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Merge pull request #85073 from hyperfekt/systemd-pstore

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nixos/systemd|filesystems: mount and evacuate /sys/fs/pstore using systemd-pstore
This commit is contained in:
Florian Klink
2021-05-17 00:00:52 +02:00
committed by GitHub
parent fb637b899a 3e3e763a07
commit 6c0058f47f
4 changed files with 46 additions and 4 deletions
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nixos/modules/tasks/filesystems.nix
+30 -4
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@@ -272,10 +272,10 @@ in
wants = [ "local-fs.target" "remote-fs.target" ];
};
# Emit systemd services to format requested filesystems.
systemd.services =
let
# Emit systemd services to format requested filesystems.
let
formatDevice = fs:
let
mountPoint' = "${escapeSystemdPath fs.mountPoint}.mount";
@@ -302,8 +302,34 @@ in
unitConfig.DefaultDependencies = false; # needed to prevent a cycle
serviceConfig.Type = "oneshot";
};
in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems));
in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems)) // {
# Mount /sys/fs/pstore for evacuating panic logs and crashdumps from persistent storage onto the disk using systemd-pstore.
# This cannot be done with the other special filesystems because the pstore module (which creates the mount point) is not loaded then.
# Since the pstore filesystem is usually empty right after mounting because the backend isn't registered yet, and a path unit cannot detect files inside of it, the same service waits for that to happen. systemd's restart mechanism can't be used here because the first failure also fails all dependent units.
"mount-pstore" = {
serviceConfig = {
Type = "oneshot";
ExecStart = "${pkgs.utillinux}/bin/mount -t pstore -o nosuid,noexec,nodev pstore /sys/fs/pstore";
ExecStartPost = pkgs.writeShellScript "wait-for-pstore.sh" ''
set -eu
TRIES=0
while [ $TRIES -lt 20 ] && [ "$(cat /sys/module/pstore/parameters/backend)" = "(null)" ]; do
sleep 0.1
TRIES=$((TRIES+1))
done
'';
RemainAfterExit = true;
};
unitConfig = {
ConditionVirtualization = "!container";
DefaultDependencies = false; # needed to prevent a cycle
};
after = [ "modprobe@pstore.service" ];
requires = [ "modprobe@pstore.service" ];
before = [ "systemd-pstore.service" ];
wantedBy = [ "systemd-pstore.service" ];
};
};
systemd.tmpfiles.rules = [
"d /run/keys 0750 root ${toString config.ids.gids.keys}"