Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

vendor/github.com/mistifyio/go-zfs/zpool.go

@@ -0,0 +1,105 @@
+package zfs
+
+// ZFS zpool states, which can indicate if a pool is online, offline,
+// degraded, etc.  More information regarding zpool states can be found here:
+// https://docs.oracle.com/cd/E19253-01/819-5461/gamno/index.html.
+const (
+	ZpoolOnline   = "ONLINE"
+	ZpoolDegraded = "DEGRADED"
+	ZpoolFaulted  = "FAULTED"
+	ZpoolOffline  = "OFFLINE"
+	ZpoolUnavail  = "UNAVAIL"
+	ZpoolRemoved  = "REMOVED"
+)
+
+// Zpool is a ZFS zpool.  A pool is a top-level structure in ZFS, and can
+// contain many descendent datasets.
+type Zpool struct {
+	Name      string
+	Health    string
+	Allocated uint64
+	Size      uint64
+	Free      uint64
+}
+
+// zpool is a helper function to wrap typical calls to zpool.
+func zpool(arg ...string) ([][]string, error) {
+	c := command{Command: "zpool"}
+	return c.Run(arg...)
+}
+
+// GetZpool retrieves a single ZFS zpool by name.
+func GetZpool(name string) (*Zpool, error) {
+	out, err := zpool("get", "all", "-p", name)
+	if err != nil {
+		return nil, err
+	}
+
+	// there is no -H
+	out = out[1:]
+
+	z := &Zpool{Name: name}
+	for _, line := range out {
+		if err := z.parseLine(line); err != nil {
+			return nil, err
+		}
+	}
+
+	return z, nil
+}
+
+// Datasets returns a slice of all ZFS datasets in a zpool.
+func (z *Zpool) Datasets() ([]*Dataset, error) {
+	return Datasets(z.Name)
+}
+
+// Snapshots returns a slice of all ZFS snapshots in a zpool.
+func (z *Zpool) Snapshots() ([]*Dataset, error) {
+	return Snapshots(z.Name)
+}
+
+// CreateZpool creates a new ZFS zpool with the specified name, properties,
+// and optional arguments.
+// A full list of available ZFS properties and command-line arguments may be
+// found here: https://www.freebsd.org/cgi/man.cgi?zfs(8).
+func CreateZpool(name string, properties map[string]string, args ...string) (*Zpool, error) {
+	cli := make([]string, 1, 4)
+	cli[0] = "create"
+	if properties != nil {
+		cli = append(cli, propsSlice(properties)...)
+	}
+	cli = append(cli, name)
+	cli = append(cli, args...)
+	_, err := zpool(cli...)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Zpool{Name: name}, nil
+}
+
+// Destroy destroys a ZFS zpool by name.
+func (z *Zpool) Destroy() error {
+	_, err := zpool("destroy", z.Name)
+	return err
+}
+
+// ListZpools list all ZFS zpools accessible on the current system.
+func ListZpools() ([]*Zpool, error) {
+	args := []string{"list", "-Ho", "name"}
+	out, err := zpool(args...)
+	if err != nil {
+		return nil, err
+	}
+
+	var pools []*Zpool
+
+	for _, line := range out {
+		z, err := GetZpool(line[0])
+		if err != nil {
+			return nil, err
+		}
+		pools = append(pools, z)
+	}
+	return pools, nil
+}