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virt-chroot.go
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virt-chroot.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package virt_chroot
import (
"os/exec"
"strings"
"kubevirt.io/kubevirt/pkg/safepath"
"kubevirt.io/kubevirt/pkg/unsafepath"
)
const (
binaryPath = "/usr/bin/virt-chroot"
mountNamespace = "/proc/1/ns/mnt"
)
func getBaseArgs() []string {
return []string{"--mount", mountNamespace}
}
func GetChrootBinaryPath() string {
return binaryPath
}
func GetChrootMountNamespace() string {
return mountNamespace
}
func MountChroot(sourcePath, targetPath *safepath.Path, ro bool) *exec.Cmd {
return UnsafeMountChroot(trimProcPrefix(sourcePath), trimProcPrefix(targetPath), ro)
}
// Deprecated: UnsafeMountChroot is used to connect to code which needs to be refactored
// to handle mounts securely.
func UnsafeMountChroot(sourcePath, targetPath string, ro bool) *exec.Cmd {
args := append(getBaseArgs(), "mount", "-o")
optionArgs := "bind"
if ro {
optionArgs = "ro," + optionArgs
}
args = append(args, optionArgs, sourcePath, targetPath)
return exec.Command(binaryPath, args...)
}
func UmountChroot(path *safepath.Path) *exec.Cmd {
return UnsafeUmountChroot(trimProcPrefix(path))
}
// Deprecated: UnsafeUmountChroot is used to connect to code which needs to be refactored
// to handle mounts securely.
func UnsafeUmountChroot(path string) *exec.Cmd {
args := append(getBaseArgs(), "umount", path)
return exec.Command(binaryPath, args...)
}
func CreateMDEVType(mdevType string, parentID string, uuid string) *exec.Cmd {
args := append(getBaseArgs(), "create-mdev")
args = append(args, "--type", mdevType, "--parent", parentID, "--uuid", uuid)
return exec.Command(binaryPath, args...)
}
func RemoveMDEVType(mdevUUID string) *exec.Cmd {
args := append(getBaseArgs(), "remove-mdev")
args = append(args, "--uuid", mdevUUID)
return exec.Command(binaryPath, args...)
}
// For general purposes
func ExecChroot(args ...string) *exec.Cmd {
return exec.Command(binaryPath, args...)
}
func trimProcPrefix(path *safepath.Path) string {
return strings.TrimPrefix(unsafepath.UnsafeAbsolute(path.Raw()), "/proc/1/root")
}