| // Copyright 2018 The etcd Authors |
| // |
| // 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. |
| |
| package agent |
| |
| import ( |
| "net" |
| "net/url" |
| "os" |
| "os/exec" |
| "path/filepath" |
| "strconv" |
| "time" |
| |
| "github.com/coreos/etcd/pkg/fileutil" |
| ) |
| |
| // TODO: support separate WAL directory |
| func archive(baseDir, etcdLogPath, dataDir string) error { |
| dir := filepath.Join(baseDir, "etcd-failure-archive", time.Now().Format(time.RFC3339)) |
| if existDir(dir) { |
| dir = filepath.Join(baseDir, "etcd-failure-archive", time.Now().Add(time.Second).Format(time.RFC3339)) |
| } |
| if err := fileutil.TouchDirAll(dir); err != nil { |
| return err |
| } |
| |
| if err := os.Rename(etcdLogPath, filepath.Join(dir, "etcd.log")); err != nil { |
| if !os.IsNotExist(err) { |
| return err |
| } |
| } |
| if err := os.Rename(dataDir, filepath.Join(dir, filepath.Base(dataDir))); err != nil { |
| if !os.IsNotExist(err) { |
| return err |
| } |
| } |
| |
| return nil |
| } |
| |
| func existDir(fpath string) bool { |
| st, err := os.Stat(fpath) |
| if err != nil { |
| if os.IsNotExist(err) { |
| return false |
| } |
| } else { |
| return st.IsDir() |
| } |
| return false |
| } |
| |
| func getURLAndPort(addr string) (urlAddr *url.URL, port int, err error) { |
| urlAddr, err = url.Parse(addr) |
| if err != nil { |
| return nil, -1, err |
| } |
| var s string |
| _, s, err = net.SplitHostPort(urlAddr.Host) |
| if err != nil { |
| return nil, -1, err |
| } |
| port, err = strconv.Atoi(s) |
| if err != nil { |
| return nil, -1, err |
| } |
| return urlAddr, port, err |
| } |
| |
| func stopWithSig(cmd *exec.Cmd, sig os.Signal) error { |
| err := cmd.Process.Signal(sig) |
| if err != nil { |
| return err |
| } |
| |
| errc := make(chan error) |
| go func() { |
| _, ew := cmd.Process.Wait() |
| errc <- ew |
| close(errc) |
| }() |
| |
| select { |
| case <-time.After(5 * time.Second): |
| cmd.Process.Kill() |
| case e := <-errc: |
| return e |
| } |
| err = <-errc |
| return err |
| } |
| |
| func cleanPageCache() error { |
| // https://www.kernel.org/doc/Documentation/sysctl/vm.txt |
| // https://github.com/torvalds/linux/blob/master/fs/drop_caches.c |
| cmd := exec.Command("/bin/sh", "-c", `echo "echo 1 > /proc/sys/vm/drop_caches" | sudo sh`) |
| return cmd.Run() |
| } |