feat(worker): ZFS support: isolate mirrors in zfs datasets

worker/zfs_hook.go

@@ -0,0 +1,45 @@
+package worker
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/codeskyblue/go-sh"
+)
+
+type zfsHook struct {
+	emptyHook
+	provider mirrorProvider
+	zpool    string
+}
+
+func newZfsHook(provider mirrorProvider, zpool string) *zfsHook {
+	return &zfsHook{
+		provider: provider,
+		zpool:    zpool,
+	}
+}
+
+// create zfs dataset for a new mirror
+func (z *zfsHook) preJob() error {
+	workingDir := z.provider.WorkingDir()
+	if _, err := os.Stat(workingDir); os.IsNotExist(err) {
+		// sudo zfs create $zfsDataset
+		// sudo zfs set mountpoint=${absPath} ${zfsDataset}
+
+		zfsDataset := fmt.Sprintf("%s/%s", z.zpool, z.provider.Name())
+		// Unknown issue of ZFS:
+		// dataset name should not contain upper case letters
+		zfsDataset = strings.ToLower(zfsDataset)
+		logger.Infof("Creating ZFS dataset %s", zfsDataset)
+		if err := sh.Command("sudo", "zfs", "create", zfsDataset).Run(); err != nil {
+			return err
+		}
+		logger.Infof("Mount ZFS dataset %s to %s", zfsDataset, workingDir)
+		if err := sh.Command("sudo", "zfs", "set", "mountpoint="+workingDir, zfsDataset).Run(); err != nil {
+			return err
+		}
+	}
+	return nil
+}