github.com/sealerio/sealer@v0.11.1-0.20240507115618-f4f89c5853ae/pkg/infra/container/utils.go (about)

     1  // Copyright © 2021 Alibaba Group Holding Ltd.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package container
    16  
    17  import (
    18  	"crypto/rand"
    19  	"fmt"
    20  	"net"
    21  	"strconv"
    22  	"strings"
    23  
    24  	v1 "github.com/sealerio/sealer/types/api/v1"
    25  	"github.com/sealerio/sealer/utils/exec"
    26  )
    27  
    28  func IsDockerAvailable() bool {
    29  	lines, err := exec.RunSimpleCmd("docker -v")
    30  	if err != nil || len(lines) != 1 {
    31  		return false
    32  	}
    33  	return strings.Contains(lines, "docker version")
    34  }
    35  
    36  func getDiff(host v1.Hosts) (int, []net.IP, error) {
    37  	var num int
    38  	var iplist []net.IP
    39  	count, err := strconv.Atoi(host.Count)
    40  	if err != nil {
    41  		return 0, nil, err
    42  	}
    43  	if count > len(host.IPList) {
    44  		//scale up
    45  		num = count - len(host.IPList)
    46  	}
    47  
    48  	if count < len(host.IPList) {
    49  		//scale down
    50  		iplist = host.IPList[count:]
    51  	}
    52  
    53  	return num, iplist, nil
    54  }
    55  
    56  func GenUniqueID(n int) string {
    57  	randBytes := make([]byte, n/2)
    58  	if _, err := rand.Read(randBytes); err != nil {
    59  		return ""
    60  	}
    61  	return fmt.Sprintf("%x", randBytes)
    62  }