mirror of
https://github.com/etcd-io/etcd.git
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448ca20cdc
The previous flag parsing has a small issue. It uses `recursive == true` and `after-index == 0` to determine if user specifies the sub flags. This is incorrect since user can specify `after-index = 0`. Then the flag parsing would be confused. This commit explicitly find the `--` in the remaining args and determine the key and cmdArgs accordingly.
138 lines
3.3 KiB
Go
138 lines
3.3 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 command
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"os/exec"
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"os/signal"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
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"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
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"github.com/coreos/etcd/client"
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)
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// NewExecWatchCommand returns the CLI command for "exec-watch".
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func NewExecWatchCommand() cli.Command {
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return cli.Command{
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Name: "exec-watch",
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Usage: "watch a key for changes and exec an executable",
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Flags: []cli.Flag{
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cli.IntFlag{Name: "after-index", Value: 0, Usage: "watch after the given index"},
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cli.BoolFlag{Name: "recursive", Usage: "watch all values for key and child keys"},
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},
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Action: func(c *cli.Context) {
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execWatchCommandFunc(c, mustNewKeyAPI(c))
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},
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}
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}
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// execWatchCommandFunc executes the "exec-watch" command.
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func execWatchCommandFunc(c *cli.Context, ki client.KeysAPI) {
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args := c.Args()
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argslen := len(args)
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if argslen < 2 {
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handleError(ExitBadArgs, errors.New("key and command to exec required"))
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}
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var (
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key string
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cmdArgs []string
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)
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foundSep := false
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for i := range args {
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if args[i] == "--" && i != 0 {
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foundSep = true
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break
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}
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}
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if foundSep {
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key = args[0]
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cmdArgs = args[2:]
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} else {
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// If no flag is parsed, the order of key and cmdArgs will be switched and
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// args will not contain `--`.
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key = args[argslen-1]
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cmdArgs = args[:argslen-1]
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}
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index := 0
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if c.Int("after-index") != 0 {
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index = c.Int("after-index") + 1
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}
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recursive := c.Bool("recursive")
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sigch := make(chan os.Signal, 1)
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signal.Notify(sigch, os.Interrupt)
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go func() {
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<-sigch
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os.Exit(0)
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}()
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w := ki.Watcher(key, &client.WatcherOptions{AfterIndex: uint64(index), Recursive: recursive})
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for {
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resp, err := w.Next(context.TODO())
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if err != nil {
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handleError(ExitServerError, err)
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}
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if resp.Node.Dir {
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fmt.Fprintf(os.Stderr, "Ignored dir %s change", resp.Node.Key)
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continue
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}
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cmd := exec.Command(cmdArgs[0], cmdArgs[1:]...)
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cmd.Env = environResponse(resp, os.Environ())
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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stderr, err := cmd.StderrPipe()
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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go func() {
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err := cmd.Start()
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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go io.Copy(os.Stdout, stdout)
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go io.Copy(os.Stderr, stderr)
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cmd.Wait()
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}()
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}
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}
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func environResponse(resp *client.Response, env []string) []string {
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env = append(env, "ETCD_WATCH_ACTION="+resp.Action)
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env = append(env, "ETCD_WATCH_MODIFIED_INDEX="+fmt.Sprintf("%d", resp.Node.ModifiedIndex))
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env = append(env, "ETCD_WATCH_KEY="+resp.Node.Key)
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env = append(env, "ETCD_WATCH_VALUE="+resp.Node.Value)
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return env
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}
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