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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 vsnapshot
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 = "snapshot"
)
//VolumeSnapshot defines structure for volume 'Snapshot' operation
type VolumeSnapshot struct {
//list of property
Property []string
//name of snapshot
Snapshot string
//name of dataset on which snapshot should be taken
Dataset string
//Recursively create snapshots of all descendent datasets
Recursive bool
// command string
Command string
// checks is list of predicate function used for validating object
checks []PredicateFunc
// error
err error
}
// NewVolumeSnapshot returns new instance of object VolumeSnapshot
func NewVolumeSnapshot() *VolumeSnapshot {
return &VolumeSnapshot{}
}
// WithCheck add given check to checks list
func (v *VolumeSnapshot) WithCheck(check ...PredicateFunc) *VolumeSnapshot {
v.checks = append(v.checks, check...)
return v
}
// WithProperty method fills the Property field of VolumeSnapshot object.
func (v *VolumeSnapshot) WithProperty(key, value string) *VolumeSnapshot {
v.Property = append(v.Property, fmt.Sprintf("%s=%s", key, value))
return v
}
// WithRecursive method fills the Recursive field of VolumeSnapshot object.
func (v *VolumeSnapshot) WithRecursive(Recursive bool) *VolumeSnapshot {
v.Recursive = Recursive
return v
}
// WithSnapshot method fills the Snapshot field of VolumeSnapshot object.
func (v *VolumeSnapshot) WithSnapshot(Snapshot string) *VolumeSnapshot {
v.Snapshot = Snapshot
return v
}
// WithDataset method fills the Dataset field of VolumeSnapshot object.
func (v *VolumeSnapshot) WithDataset(Dataset string) *VolumeSnapshot {
v.Dataset = Dataset
return v
}
// WithCommand method fills the Command field of VolumeSnapshot object.
func (v *VolumeSnapshot) WithCommand(Command string) *VolumeSnapshot {
v.Command = Command
return v
}
// Validate is to validate generated VolumeSnapshot object by builder
func (v *VolumeSnapshot) Validate() *VolumeSnapshot {
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 VolumeSnapshot object
func (v *VolumeSnapshot) Execute() ([]byte, error) {
v, err := v.Build()
if err != nil {
return nil, err
}
// execute command here
// #nosec
return exec.Command(bin.BASH, "-c", v.Command).CombinedOutput()
}
// Build returns the VolumeSnapshot object generated by builder
func (v *VolumeSnapshot) Build() (*VolumeSnapshot, error) {
var c strings.Builder
v = v.Validate()
v.appendCommand(&c, bin.ZFS)
v.appendCommand(&c, fmt.Sprintf(" %s ", Operation))
if IsRecursiveSet()(v) {
v.appendCommand(&c, fmt.Sprintf(" -r "))
}
if IsPropertySet()(v) {
for _, p := range v.Property {
v.appendCommand(&c, fmt.Sprintf(" -o %s", p))
}
}
v.appendCommand(&c, fmt.Sprintf(" %s@%s ", v.Dataset, v.Snapshot))
v.Command = c.String()
return v, v.err
}
// appendCommand append string to given string builder
func (v *VolumeSnapshot) 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())
}
}