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utils.go
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utils.go
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// Copyright © 2021 Alibaba Group Holding Ltd.
//
// 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 container
import (
"crypto/rand"
"fmt"
"net"
"strconv"
"strings"
v1 "github.com/sealerio/sealer/types/api/v1"
"github.com/sealerio/sealer/utils/exec"
)
func IsDockerAvailable() bool {
lines, err := exec.RunSimpleCmd("docker -v")
if err != nil || len(lines) != 1 {
return false
}
return strings.Contains(lines, "docker version")
}
func getDiff(host v1.Hosts) (int, []net.IP, error) {
var num int
var iplist []net.IP
count, err := strconv.Atoi(host.Count)
if err != nil {
return 0, nil, err
}
if count > len(host.IPList) {
//scale up
num = count - len(host.IPList)
}
if count < len(host.IPList) {
//scale down
iplist = host.IPList[count:]
}
return num, iplist, nil
}
func GenUniqueID(n int) string {
randBytes := make([]byte, n/2)
if _, err := rand.Read(randBytes); err != nil {
return ""
}
return fmt.Sprintf("%x", randBytes)
}