lowlevel

type Exec interface {
	Run(prog string, args []string) error
	RunWithExitCode(prog string, args []string) (int, error) // for mountpoint querying
	Read(prog string, args []string) (stdout string, err error)
	ReadWithExitCode(prog string, args []string) (stdout string, rc int, err error) // for blkid querying
	Lookup(prog string) error
	Getuid() int

	// unit read/write injection
	ReadFile(fn string) ([]byte, error)
	WriteFile(fn string, c []byte, p os.FileMode) error
	MkdirAll(path string, perm os.FileMode) error
	Exists(path string) (bool, error)

	// Local Filesystem Functions
	EvalSymlinks(string) (string, error)
}

type LVM interface {
	// Check for LVM tools installed and useable
	Check() error

	// Check for mkfs.* tools installed and useable
	CheckFilesystemTools(fstype string) error

	QueryLogicalVolumes(vg string) (map[string]*LogicalVolume, error)
	QueryPhysicalVolumes() (map[string]*PhysicalVolume, error)
	QueryVolumeGroups() (map[string]*VolumeGroup, error)
	CreateVolumeGroup(vg string, devs []string) error
	ExtendVolumeGroup(vg string, dev string) error
	ReduceVolumeGroup(vg string, dev string) error
	CreatePhysicalVolume(dev string) error
	RemovePhysicalVolume(dev string, force bool) error
	CreateLogicalVolume(group string, volume string, size *LvmSize) error
	Mkfs(dev string, fstype string) error
	Mountpoint(path string) (bool, error)
	Blkid(dev string) (string, error)
	WaitForDevice(path string) error

	// systemd units
	CheckUnit(filename string, content string) (bool, error)
	UpdateUnit(filename string, content string) error
	StartUnit(filename string) error
}

type LogicalVolume struct {
	Name       string `mapstructure:"LVM2_LV_NAME"`
	DevicePath string `mapstructure:"LVM2_LV_DM_PATH"`
}

type LvmSize struct {
	Size     int64
	Relative bool
	Unit     string
}

type PhysicalVolume struct {
	Name   string `mapstructure:"LVM2_PV_NAME"`
	Group  string `mapstructure:"LVM2_VG_NAME"`
	Device string
}

type VolumeGroup struct {
	Name string `mapstructure:"LVM2_VG_NAME"`
}