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mount service: use uevent-watch

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This commit is contained in:
Daniel Barlow 2024-04-17 12:59:13 +01:00
parent 721e7499f3
commit 00076c7b81
4 changed files with 39 additions and 47 deletions
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2
examples/arhcive.nix
View file

@ -83,7 +83,7 @@ in rec {
}; };
services.mount_external_disk = svc.mount.build { services.mount_external_disk = svc.mount.build {
device = "LABEL=backup-disk"; partlabel = "backup-disk";
mountpoint = "/srv"; mountpoint = "/srv";
fstype = "ext4"; fstype = "ext4";
}; };

16
modules/mount/default.nix
View file

@ -19,11 +19,12 @@ in {
type = liminix.lib.types.serviceDefn; type = liminix.lib.types.serviceDefn;
}; };
}; };
config.system.service = { imports = [ ../mdevd.nix ];
mount = liminix.callService ./service.nix { config.system.service.mount =
device = mkOption { let svc = liminix.callService ./service.nix {
partlabel = mkOption {
type = types.str; type = types.str;
example = "/dev/sda1"; example = "my-usb-stick";
}; };
mountpoint = mkOption { mountpoint = mkOption {
type = types.str; type = types.str;
@ -40,7 +41,14 @@ in {
example = "vfat"; example = "vfat";
}; };
}; };
in svc // {
build = args:
let args' = args // {
dependencies = (args.dependencies or []) ++ [config.services.mdevd];
}; };
in svc.build args' ;
};
config.programs.busybox = { config.programs.busybox = {
applets = ["blkid" "findfs"]; applets = ["blkid" "findfs"];
options = { options = {

13
modules/mount/service.nix
View file

@ -1,10 +1,12 @@
{ {
liminix liminix
, uevent-watch
, lib , lib
}: }:
{ device, mountpoint, options, fstype }: { partlabel, mountpoint, options, fstype }:
let let
inherit (liminix.services) longrun oneshot; inherit (liminix.services) longrun oneshot;
device = "/dev/disk/by-partlabel/${partlabel}";
options_string = options_string =
if options == [] then "" else "-o ${lib.concatStringsSep "," options}"; if options == [] then "" else "-o ${lib.concatStringsSep "," options}";
mount_service = oneshot { mount_service = oneshot {
@ -18,14 +20,7 @@ in longrun {
isTrigger = true; isTrigger = true;
buildInputs = [ mount_service ]; buildInputs = [ mount_service ];
# This accommodates bringing the service up when the device appears.
# It doesn't bring it down on unplug because unmount will probably
# fail anyway (so don't do that)
run = '' run = ''
while ! findfs ${device}; do ${uevent-watch}/bin/uevent-watch -s ${mount_service.name} -n ${device} partname=${partlabel} devtype=partition
echo waiting for device ${device}
sleep 1
done
s6-rc -b -u change ${mount_service.name}
''; '';
} }

19
tests/inout/configuration.nix
View file

@ -47,20 +47,9 @@ in rec {
rootfsType = "jffs2"; rootfsType = "jffs2";
hostname = "inout"; hostname = "inout";
services.watch_mount_srv = services.mount_backup_disk = svc.mount.build {
let partlabel = "backup-disk";
node = "/dev/disk/by-partlabel/backup-disk"; mountpoint = "/srv";
mount = oneshot { fstype = "ext4";
name = "mount-srv";
up = "mount -t ext2 ${node} /srv";
down = "umount /srv";
};
in longrun {
name = "mount_srv";
run = ''
${pkgs.uevent-watch}/bin/uevent-watch -s ${mount.name} -n ${node} partname=backup-disk devtype=partition
'';
dependencies = [ config.services.mdevd ];
buildInputs = [ mount ];
}; };
} }