Merge pull request #124431 from hyperfekt/systemd-pstore

      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.util-linux}/bin/mount -t pstore -o nosuid,noexec,nodev pstore /sys/fs/pstore";

            ExecStartPost = pkgs.writeShellScript "wait-for-pstore.sh" ''

            # skip on kernels without the pstore module

            ExecCondition = "${pkgs.kmod}/bin/modprobe -b pstore";

            ExecStart = pkgs.writeShellScript "mount-pstore.sh" ''

              set -eu

              TRIES=0

              while [ $TRIES -lt 20 ] && [ "$(cat /sys/module/pstore/parameters/backend)" = "(null)" ]; do

              # if the pstore module is builtin it will have mounted the persistent store automatically. it may also be already mounted for other reasons.

              ${pkgs.util-linux}/bin/mountpoint -q /sys/fs/pstore || ${pkgs.util-linux}/bin/mount -t pstore -o nosuid,noexec,nodev pstore /sys/fs/pstore

              # wait up to five seconds (arbitrary, happened within one in testing) for the backend to be registered and the files to appear. a systemd path unit cannot detect this happening; and succeeding after a restart would not start dependent units.

              TRIES=50

              while [ "$(cat /sys/module/pstore/parameters/backend)" = "(null)" ]; do

                if (( $TRIES )); then

                  sleep 0.1

                TRIES=$((TRIES+1))

                  TRIES=$((TRIES-1))

                else

                  echo "Persistent Storage backend was not registered in time." >&2

                  exit 1

                fi

              done

            '';

            RemainAfterExit = true;

          };

          unitConfig = {

            ConditionPathIsMountPoint = "!/sys/fs/pstore";

            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" ];

        };