59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
// Copyright (c) Huawei Technologies Co., Ltd. 2019. All rights reserved.
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// lxcfs-tools is licensed under the Mulan PSL v1.
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// You can use this software according to the terms and conditions of the Mulan PSL v1.
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// You may obtain a copy of Mulan PSL v1 at:
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// http://license.coscl.org.cn/MulanPSL
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// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
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// PURPOSE.
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// See the Mulan PSL v1 for more details.
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// Description: exec prestart mount hook
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// Author: zhangsong
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// Create: 2019-01-18
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// go base main package
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package main
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import (
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"fmt"
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"io/ioutil"
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"lxcfs-tools/libmount"
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"os"
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"strconv"
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lxcfs_log "github.com/sirupsen/logrus"
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)
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func prestartMountHook(pid int, rootfs string) error {
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lxcfssubpath, err := ioutil.ReadDir("/var/lib/lxc/lxcfs/proc")
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if err != nil {
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lxcfs_log.Errorf("Prase lxcfs dir failed: %v", err)
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return err
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}
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initMountns, err := os.Readlink("/proc/1/ns/mnt")
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if err != nil {
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return fmt.Errorf("read init mount namespace fail: %v", err)
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}
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mountns, err := os.Readlink("/proc/" + strconv.Itoa(pid) + "/ns/mnt")
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if err != nil {
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return fmt.Errorf("read container mount namespace fail: %v", err)
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}
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if initMountns == mountns {
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return fmt.Errorf("container pid changed: container mount namespace is same as init namespace")
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}
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var valuePaths []string
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var valueMountPaths []string
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for _, value := range lxcfssubpath {
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valuePaths = append(valuePaths, fmt.Sprintf("%s/proc/%s", rootfs, value.Name()))
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valueMountPaths = append(valueMountPaths, fmt.Sprintf("/var/lib/lxc/lxcfs/proc/%s", value.Name()))
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}
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if err := libmount.NsExecMount(strconv.Itoa(pid), rootfs, valueMountPaths, valuePaths); err != nil {
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lxcfs_log.Errorf("mount %v into container error: %v", valueMountPaths, err)
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return err
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}
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return nil
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}
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