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// Copyright © 2013, 2014, The Go-LXC Authors. All rights reserved.
// Use of this source code is governed by a LGPLv2.1
// license that can be found in the LICENSE file.
//go:build linux && cgo
// +build linux,cgo
package lxc
// #include <lxc/lxccontainer.h>
// #include <lxc/version.h>
// #include "lxc-binding.h"
// #ifndef LXC_DEVEL
// #define LXC_DEVEL 0
// #endif
import "C"
import (
"fmt"
"strconv"
"strings"
"unsafe"
)
// NewContainer returns a new container struct.
// Caller needs to call Release() on the returned container to release its resources.
func NewContainer(name string, lxcpath ...string) (*Container, error) {
var container *C.struct_lxc_container
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
if lxcpath != nil && len(lxcpath) == 1 {
clxcpath := C.CString(lxcpath[0])
defer C.free(unsafe.Pointer(clxcpath))
container = C.lxc_container_new(cname, clxcpath)
} else {
container = C.lxc_container_new(cname, nil)
}
if container == nil {
return nil, ErrNewFailed
}
c := &Container{container: container, verbosity: Quiet}
return c, nil
}
// Acquire increments the reference counter of the container object.
func Acquire(c *Container) bool {
c.mu.RLock()
defer c.mu.RUnlock()
return C.lxc_container_get(c.container) == 1
}
// Release decrements the reference counter of the container object.
func Release(c *Container) bool {
return c.Release() == nil
}
// Version returns the LXC version.
func Version() string {
version := C.GoString(C.lxc_get_version())
// New liblxc versions append "-devel" when LXC_DEVEL is set.
if strings.HasSuffix(version, "-devel") {
return fmt.Sprintf("%s (devel)", version[:(len(version)-len("-devel"))])
}
return version
}
// GlobalConfigItem returns the value of the given global config key.
func GlobalConfigItem(name string) string {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
return C.GoString(C.lxc_get_global_config_item(cname))
}
// DefaultConfigPath returns default config path.
func DefaultConfigPath() string {
return GlobalConfigItem("lxc.lxcpath")
}
// DefaultLvmVg returns the name of the default LVM volume group.
func DefaultLvmVg() string {
return GlobalConfigItem("lxc.bdev.lvm.vg")
}
// DefaultZfsRoot returns the name of the default ZFS root.
func DefaultZfsRoot() string {
return GlobalConfigItem("lxc.bdev.zfs.root")
}
// ContainerNames returns the names of defined and active containers on the system.
func ContainerNames(lxcpath ...string) []string {
var size int
var cnames **C.char
if lxcpath != nil && len(lxcpath) == 1 {
clxcpath := C.CString(lxcpath[0])
defer C.free(unsafe.Pointer(clxcpath))
size = int(C.list_all_containers(clxcpath, &cnames, nil))
} else {
size = int(C.list_all_containers(nil, &cnames, nil))
}
if size < 1 {
return nil
}
return convertNArgs(cnames, size)
}
// Containers returns the defined and active containers on the system. Only
// containers that could retrieved successfully are returned.
// Caller needs to call Release() on the returned containers to release resources.
func Containers(lxcpath ...string) []*Container {
var containers []*Container
for _, v := range ContainerNames(lxcpath...) {
if container, err := NewContainer(v, lxcpath...); err == nil {
containers = append(containers, container)
}
}
return containers
}
// DefinedContainerNames returns the names of the defined containers on the system.
func DefinedContainerNames(lxcpath ...string) []string {
var size int
var cnames **C.char
if lxcpath != nil && len(lxcpath) == 1 {
clxcpath := C.CString(lxcpath[0])
defer C.free(unsafe.Pointer(clxcpath))
size = int(C.list_defined_containers(clxcpath, &cnames, nil))
} else {
size = int(C.list_defined_containers(nil, &cnames, nil))
}
if size < 1 {
return nil
}
return convertNArgs(cnames, size)
}
// DefinedContainers returns the defined containers on the system. Only
// containers that could retrieved successfully are returned.
// Caller needs to call Release() on the returned containers to release resources.
func DefinedContainers(lxcpath ...string) []*Container {
var containers []*Container
for _, v := range DefinedContainerNames(lxcpath...) {
if container, err := NewContainer(v, lxcpath...); err == nil {
containers = append(containers, container)
}
}
return containers
}
// ActiveContainerNames returns the names of the active containers on the system.
func ActiveContainerNames(lxcpath ...string) []string {
var size int
var cnames **C.char
if lxcpath != nil && len(lxcpath) == 1 {
clxcpath := C.CString(lxcpath[0])
defer C.free(unsafe.Pointer(clxcpath))
size = int(C.list_active_containers(clxcpath, &cnames, nil))
} else {
size = int(C.list_active_containers(nil, &cnames, nil))
}
if size < 1 {
return nil
}
return convertNArgs(cnames, size)
}
// ActiveContainers returns the active containers on the system. Only
// containers that could retrieved successfully are returned.
// Caller needs to call Release() on the returned containers to release resources.
func ActiveContainers(lxcpath ...string) []*Container {
var containers []*Container
for _, v := range ActiveContainerNames(lxcpath...) {
if container, err := NewContainer(v, lxcpath...); err == nil {
containers = append(containers, container)
}
}
return containers
}
// VersionNumber returns the LXC version.
func VersionNumber() (major int, minor int) {
major = C.LXC_VERSION_MAJOR
minor = C.LXC_VERSION_MINOR
return
}
// VersionAtLeast returns true when the tested version >= current version.
func VersionAtLeast(major int, minor int, micro int) bool {
if C.LXC_DEVEL == 1 {
return true
}
if major > C.LXC_VERSION_MAJOR {
return false
}
if major == C.LXC_VERSION_MAJOR &&
minor > C.LXC_VERSION_MINOR {
return false
}
if major == C.LXC_VERSION_MAJOR &&
minor == C.LXC_VERSION_MINOR &&
micro > C.LXC_VERSION_MICRO {
return false
}
return true
}
// IsSupportedConfigItem returns true if the key belongs to a supported config item.
func IsSupportedConfigItem(key string) bool {
configItem := C.CString(key)
defer C.free(unsafe.Pointer(configItem))
return bool(C.go_lxc_config_item_is_supported(configItem))
}
// RuntimeLiblxcVersionAtLeast checks if the system's liblxc matches the
// provided version requirement
func RuntimeLiblxcVersionAtLeast(version string, major int, minor int, micro int) bool {
// Strip git versioning from pre-release snapshots.
version = strings.Split(version, "~")[0]
// Convert devel indicator into a valid version.
version = strings.Replace(version, " (devel)", "-devel", 1)
// Split the version into its major, minor and micro parts.
parts := strings.Split(version, ".")
partsLen := len(parts)
if partsLen == 0 {
return false
}
// If the last part includes -devel, assume everything is supported.
develParts := strings.Split(parts[partsLen-1], "-")
if len(develParts) == 2 && develParts[1] == "devel" {
return true
}
// Actually parse and compare the version string now.
maj := -1
min := -1
mic := -1
for i, v := range parts {
if i > 2 {
break
}
num, err := strconv.Atoi(v)
if err != nil {
return false
}
switch i {
case 0:
maj = num
case 1:
min = num
case 2:
mic = num
}
}
/* Major version is greater. */
if maj > major {
return true
}
if maj < major {
return false
}
/* Minor number is greater.*/
if min > minor {
return true
}
if min < minor {
return false
}
/* Patch number is greater. */
if mic > micro {
return true
}
if mic < micro {
return false
}
return true
}
// HasApiExtension returns true if the extension is supported.
// Deprecated: Please use HasAPIExtension instead.
func HasApiExtension(extension string) bool {
return HasAPIExtension(extension)
}
// HasAPIExtension returns true if the extension is supported.
func HasAPIExtension(extension string) bool {
if RuntimeLiblxcVersionAtLeast(Version(), 3, 1, 0) {
apiExtension := C.CString(extension)
defer C.free(unsafe.Pointer(apiExtension))
return bool(C.go_lxc_has_api_extension(apiExtension))
}
return false
}
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