88377fa346
This adds basic plugins. "main" types: veth, bridge, macvlan "ipam" type: host-local The code has been ported over from github.com/coreos/rkt project and adapted to fit the CNI spec.
89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package disk
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import (
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"io/ioutil"
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"net"
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"os"
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"path/filepath"
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)
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var defaultDataDir = "/var/lib/cni/networks"
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type Store struct {
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FileLock
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dataDir string
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}
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func New(network string) (*Store, error) {
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dir := filepath.Join(defaultDataDir, network)
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if err := os.MkdirAll(dir, 0644); err != nil {
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return nil, err
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}
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lk, err := NewFileLock(dir)
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if err != nil {
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return nil, err
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}
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return &Store{*lk, dir}, nil
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}
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func (s *Store) Reserve(id string, ip net.IP) (bool, error) {
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fname := filepath.Join(s.dataDir, ip.String())
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f, err := os.OpenFile(fname, os.O_RDWR|os.O_EXCL|os.O_CREATE, 0644)
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if os.IsExist(err) {
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return false, nil
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}
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if err != nil {
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return false, err
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}
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if _, err := f.WriteString(id); err != nil {
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f.Close()
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os.Remove(f.Name())
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return false, err
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}
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if err := f.Close(); err != nil {
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os.Remove(f.Name())
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return false, err
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}
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return true, nil
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}
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func (s *Store) Release(ip net.IP) error {
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return os.Remove(filepath.Join(s.dataDir, ip.String()))
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}
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// N.B. This function eats errors to be tolerant and
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// release as much as possible
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func (s *Store) ReleaseByID(id string) error {
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err := filepath.Walk(s.dataDir, func(path string, info os.FileInfo, err error) error {
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if err != nil || info.IsDir() {
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return nil
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}
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil
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}
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if string(data) == id {
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if err := os.Remove(path); err != nil {
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return nil
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}
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}
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return nil
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})
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return err
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}
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