diff options
| -rw-r--r-- | example/btrfs-subvolumes.nix | 20 | ||||
| -rw-r--r-- | types.nix | 142 |
2 files changed, 132 insertions, 30 deletions
diff --git a/example/btrfs-subvolumes.nix b/example/btrfs-subvolumes.nix index 02ce2a4..25994df 100644 --- a/example/btrfs-subvolumes.nix +++ b/example/btrfs-subvolumes.nix @@ -27,11 +27,21 @@ end = "100%"; content = { type = "btrfs"; - mountpoint = "/"; - subvolumes = [ - "/home" - "/test" - ]; + extraArgs = "-f"; # Override existing partition + subvolumes = { + # Subvolume name is different from mountpoint + "/rootfs" = { + mountpoint = "/"; + }; + # Mountpoints inferred from subvolume name + "/home" = { + mountOptions = ["compress=zstd"]; + }; + "/nix" = { + mountOptions = ["compress=zstd" "noatime"]; + }; + "/test" = {}; + }; }; } ]; @@ -306,7 +306,7 @@ rec { }; }]; }; - _pkgs= mkOption { + _pkgs = mkOption { internal = true; readOnly = true; type = types.functionTo (types.listOf types.package); @@ -321,49 +321,137 @@ rec { type = types.enum [ "btrfs" ]; internal = true; }; + extraArgs = mkOption { + type = types.str; + default = ""; + }; mountOptions = mkOption { type = types.listOf types.str; default = [ "defaults" ]; }; subvolumes = mkOption { - type = types.listOf optionTypes.pathname; - default = []; + type = types.attrsOf btrfs_subvol; + default = {}; }; mountpoint = mkOption { - type = optionTypes.absolute-pathname; + type = types.nullOr optionTypes.absolute-pathname; + default = null; }; _meta = mkOption { internal = true; readOnly = true; type = types.functionTo diskoLib.jsonType; - default = dev: { - }; + default = dev: + diskoLib.deepMergeMap (subvol: subvol._meta dev) (attrValues config.subvolumes); }; _create = mkOption { internal = true; readOnly = true; type = types.functionTo types.str; default = dev: '' - mkfs.btrfs ${dev} - ${optionalString (!isNull config.subvolumes or null) '' - MNTPOINT=$(mktemp -d) - ( - mount ${dev} "$MNTPOINT" - trap 'umount $MNTPOINT; rm -rf $MNTPOINT' EXIT - ${concatMapStringsSep "\n" (subvolume: "btrfs subvolume create \"$MNTPOINT\"/${subvolume}") config.subvolumes} - ) - ''} + mkfs.btrfs ${dev} ${config.extraArgs} + ${concatMapStrings (subvol: subvol._create dev) (attrValues config.subvolumes)} ''; }; _mount = mkOption { internal = true; readOnly = true; type = types.functionTo diskoLib.jsonType; + default = dev: + let + subvolMounts = diskoLib.deepMergeMap (subvol: subvol._mount dev config.mountpoint) (attrValues config.subvolumes); + in { + fs = subvolMounts.fs // optionalAttrs (!isNull config.mountpoint) { + ${config.mountpoint} = '' + if ! findmnt ${dev} "/mnt${config.mountpoint}" > /dev/null 2>&1; then + mount ${dev} "/mnt${config.mountpoint}" \ + ${concatMapStringsSep " " (opt: "-o ${opt}") config.mountOptions} \ + -o X-mount.mkdir + fi + ''; + }; + }; + }; + _config = mkOption { + internal = true; + readOnly = true; + default = dev: [ + (map (subvol: subvol._config dev config.mountpoint) (attrValues config.subvolumes)) + (optional (!isNull config.mountpoint) { + fileSystems.${config.mountpoint} = { + device = dev; + fsType = "btrfs"; + options = config.mountOptions; + }; + }) + ]; + }; + _pkgs = mkOption { + internal = true; + readOnly = true; + type = types.functionTo (types.listOf types.package); + default = pkgs: + [ pkgs.btrfs-progs ] ++ flatten (map (subvolume: subvolume._pkgs pkgs) (attrValues config.subvolumes)); + }; + }; + }); + + btrfs_subvol = types.submodule ({ config, ... }: { + options = { + name = mkOption { + type = types.str; + default = config._module.args.name; + }; + type = mkOption { + type = types.enum [ "btrfs_subvol" ]; + default = "btrfs_subvol"; + internal = true; + }; + extraArgs = mkOption { + type = types.str; + default = ""; + }; + mountOptions = mkOption { + type = types.listOf types.str; + default = [ "defaults" ]; + }; + mountpoint = mkOption { + type = types.nullOr optionTypes.absolute-pathname; + default = null; + }; + _meta = mkOption { + internal = true; + readOnly = true; + type = types.functionTo diskoLib.jsonType; default = dev: { - fs.${config.mountpoint} = '' - if ! findmnt ${dev} "/mnt${config.mountpoint}" > /dev/null 2>&1; then - mount ${dev} "/mnt${config.mountpoint}" \ - ${concatMapStringsSep " " (opt: "-o ${opt}") config.mountOptions} \ + }; + }; + _create = mkOption { + internal = true; + readOnly = true; + type = types.functionTo types.str; + default = dev: '' + MNTPOINT=$(mktemp -d) + ( + mount ${dev} "$MNTPOINT" -o subvol=/ + trap 'umount $MNTPOINT; rm -rf $MNTPOINT' EXIT + btrfs subvolume create "$MNTPOINT"/${config.name} ${config.extraArgs} + ) + ''; + }; + _mount = mkOption { + internal = true; + readOnly = true; + type = types.functionTo (types.functionTo diskoLib.jsonType); + default = dev: parent: let + mountpoint = if (!isNull config.mountpoint) then config.mountpoint + else if (isNull parent) then config.name + else null; + in optionalAttrs (!isNull mountpoint) { + fs.${mountpoint} = '' + if ! findmnt ${dev} "/mnt${mountpoint}" > /dev/null 2>&1; then + mount ${dev} "/mnt${mountpoint}" \ + ${concatMapStringsSep " " (opt: "-o ${opt}") (config.mountOptions ++ [ "subvol=${config.name}" ])} \ -o X-mount.mkdir fi ''; @@ -372,19 +460,23 @@ rec { _config = mkOption { internal = true; readOnly = true; - default = dev: [{ - fileSystems.${config.mountpoint} = { + default = dev: parent: let + mountpoint = if (!isNull config.mountpoint) then config.mountpoint + else if (isNull parent) then config.name + else null; + in optional (!isNull mountpoint) { + fileSystems.${mountpoint} = { device = dev; fsType = "btrfs"; - options = config.mountOptions; + options = config.mountOptions ++ [ "subvol=${config.name}" ]; }; - }]; + }; }; - _pkgs= mkOption { + _pkgs = mkOption { internal = true; readOnly = true; type = types.functionTo (types.listOf types.package); - default = pkgs: []; + default = pkgs: [ pkgs.coreutils ]; }; }; }); |