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builder.go
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builder.go
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/*
Copyright 2019 The OpenEBS Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package vclone
import (
"fmt"
"os/exec"
"reflect"
"runtime"
"strings"
"github.com/openebs/cstor-operators/pkg/zcmd/bin"
"github.com/pkg/errors"
)
const (
// Operation defines type of zfs operation
Operation = "clone"
)
//VolumeClone defines structure for volume 'Clone' operation
type VolumeClone struct {
//snapshot from where clone needs to be created
Snapshot string
//targeted dataset name
TargetDataset string
//source dataset name
SourceDataset string
//property for dataset
Property []string
//createall the non-existing parent datasets
CreateParent bool
//command string
Command string
// checks is list of predicate function used for validating object
checks []PredicateFunc
// error
err error
}
// NewVolumeClone returns new instance of object VolumeClone
func NewVolumeClone() *VolumeClone {
return &VolumeClone{}
}
// WithCheck add given check to checks list
func (v *VolumeClone) WithCheck(check ...PredicateFunc) *VolumeClone {
v.checks = append(v.checks, check...)
return v
}
// WithSnapshot method fills the Snapshot field of VolumeClone object.
func (v *VolumeClone) WithSnapshot(Snapshot string) *VolumeClone {
v.Snapshot = Snapshot
return v
}
// WithTargetDataset method fills the TargetDataset field of VolumeClone object.
func (v *VolumeClone) WithTargetDataset(TargetDataset string) *VolumeClone {
v.TargetDataset = TargetDataset
return v
}
// WithSourceDataset method fills the SourceDataset field of VolumeClone object.
func (v *VolumeClone) WithSourceDataset(SourceDataset string) *VolumeClone {
v.SourceDataset = SourceDataset
return v
}
// WithProperty method fills the Property field of VolumeClone object.
func (v *VolumeClone) WithProperty(key, value string) *VolumeClone {
v.SetProperty(key, value)
return v
}
// WithCreateParent method fills the CreateParent field of VolumeClone object.
func (v *VolumeClone) WithCreateParent(CreateParent bool) *VolumeClone {
v.CreateParent = CreateParent
return v
}
// WithCommand method fills the Command field of VolumeClone object.
func (v *VolumeClone) WithCommand(Command string) *VolumeClone {
v.Command = Command
return v
}
// Validate is to validate generated VolumeClone object by builder
func (v *VolumeClone) Validate() *VolumeClone {
for _, check := range v.checks {
if !check(v) {
v.err = errors.Wrapf(v.err, "validation failed {%v}", runtime.FuncForPC(reflect.ValueOf(check).Pointer()).Name())
}
}
return v
}
// Execute is to execute generated VolumeClone object
func (v *VolumeClone) Execute() ([]byte, error) {
v, err := v.Build()
if err != nil {
return nil, err
}
// #nosec
return exec.Command(bin.BASH, "-c", v.Command).CombinedOutput()
}
// Build returns the VolumeClone object generated by builder
func (v *VolumeClone) Build() (*VolumeClone, error) {
var c strings.Builder
v = v.Validate()
v.appendCommand(&c, bin.ZFS)
v.appendCommand(&c, fmt.Sprintf(" %s ", Operation))
v.appendCommand(&c, fmt.Sprintf("%s@%s ", v.SourceDataset, v.Snapshot))
v.appendCommand(&c, v.TargetDataset)
v.Command = c.String()
return v, v.err
}
// appendCommand append string to given string builder
func (v *VolumeClone) appendCommand(c *strings.Builder, cmd string) {
_, err := c.WriteString(cmd)
if err != nil {
v.err = errors.Wrapf(v.err, "Failed to append cmd{%s} : %s", cmd, err.Error())
}
}