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system.go
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system.go
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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// 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.
// The system package provides a collection of interfaces
// that can be used to modify certain properties of the system
// the go program is running on. It can also be used to make
// system calls. The main purpose of this package is to
// abstract away the system so that it can be mocked for
// unit tests.
package system
import (
"path"
"github.com/vmware/vic/lib/etcconf"
"github.com/vmware/vic/pkg/vsphere/sys"
)
type System struct {
Hosts etcconf.Hosts // the hosts file on the system, e.g. /etc/hosts
ResolvConf etcconf.ResolvConf // the resolv.conf file on the system, e.g. /etc/resolv.conf
Syscall Syscall // syscall interface for making system calls
// constants
Root string // system's root path
UUID string // machine id
}
func New() System {
// #nosec: Errors unhandled.
id, _ := sys.UUID()
return System{
Hosts: etcconf.NewHosts(""), // default hosts files, e.g. /etc/hosts on linux
ResolvConf: etcconf.NewResolvConf(""), // default resolv.conf file, e.g. /etc/resolv.conf on linux
Syscall: &syscallImpl{}, // the syscall interface
Root: "/", // the system root path
UUID: id,
}
}
// NewWithRoot takes a path at which to set the "root" of the system.
// This will cause the hosts and resolv.conf files to be in their default paths, but
// relative to that root
func NewWithRoot(root string) System {
id, _ := sys.UUID()
return System{
Hosts: etcconf.NewHosts(path.Join(root, etcconf.HostsPath)), // default hosts files, e.g. /etc/hosts on linux
ResolvConf: etcconf.NewResolvConf(path.Join(root, etcconf.ResolvConfPath)), // default resolv.conf file, e.g. /etc/resolv.conf on linux
Syscall: &syscallImpl{}, // the syscall interface
Root: root, // the system root path
UUID: id,
}
}