e085226f82
Add an e2e host-local plugin testcase, which requires being able to pass the datadir into the plugin so we can erase it later. We're not always guaranteed to have access to the default data dir location, plus it should probably be configurable anyway.
111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
// Copyright 2015 CNI authors
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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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"fmt"
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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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const lastIPFile = "last_reserved_ip"
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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, dataDir string) (*Store, error) {
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if dataDir == "" {
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dataDir = defaultDataDir
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}
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dir := filepath.Join(dataDir, 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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// store the reserved ip in lastIPFile
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ipfile := filepath.Join(s.dataDir, lastIPFile)
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err = ioutil.WriteFile(ipfile, []byte(ip.String()), 0644)
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if err != nil {
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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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// LastReservedIP returns the last reserved IP if exists
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func (s *Store) LastReservedIP() (net.IP, error) {
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ipfile := filepath.Join(s.dataDir, lastIPFile)
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data, err := ioutil.ReadFile(ipfile)
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if err != nil {
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return nil, fmt.Errorf("Failed to retrieve last reserved ip: %v", err)
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}
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return net.ParseIP(string(data)), 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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