|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "os" |
| 5 | + "os/exec" |
| 6 | + "path/filepath" |
| 7 | + "slices" |
| 8 | + |
| 9 | + "github.com/containers/buildah/internal/rpc/listen" |
| 10 | + "github.com/containers/buildah/internal/rpc/noop" |
| 11 | + "github.com/sirupsen/logrus" |
| 12 | + "github.com/spf13/cobra" |
| 13 | + "golang.org/x/sync/errgroup" |
| 14 | + "google.golang.org/grpc" |
| 15 | + "google.golang.org/grpc/reflection" |
| 16 | +) |
| 17 | + |
| 18 | +var ( |
| 19 | + rpcDescription = "\n Runs a command with a rudimentary RPC server available." |
| 20 | + rpcCommand = &cobra.Command{ |
| 21 | + Use: "rpc", |
| 22 | + Short: "Run a command with a rudimentary RPC server available", |
| 23 | + Long: rpcDescription, |
| 24 | + RunE: rpcCmd, |
| 25 | + Hidden: true, |
| 26 | + Example: `buildah rpc [-e|--env NAME] [-l|--listen PATH] command ...`, |
| 27 | + Args: cobra.MinimumNArgs(1), |
| 28 | + } |
| 29 | +) |
| 30 | + |
| 31 | +func rpcCmd(c *cobra.Command, args []string) error { |
| 32 | + store, err := getStore(c) |
| 33 | + if err != nil { |
| 34 | + return err |
| 35 | + } |
| 36 | + |
| 37 | + socketPath := c.Flag("listen").Value.String() |
| 38 | + if socketPath == "" { |
| 39 | + socketDir, err := os.MkdirTemp(store.RunRoot(), "buildah-socket") |
| 40 | + if err != nil { |
| 41 | + return err |
| 42 | + } |
| 43 | + defer func() { |
| 44 | + if err := os.RemoveAll(socketDir); err != nil { |
| 45 | + logrus.Errorf("removing %s: %v", socketDir, err) |
| 46 | + } |
| 47 | + }() |
| 48 | + socketPath = filepath.Join(socketDir, "socket") |
| 49 | + } |
| 50 | + listener, cleanup, err := listen.Listen(socketPath) |
| 51 | + if err != nil { |
| 52 | + return err |
| 53 | + } |
| 54 | + logrus.Debugf("listening for rpc requests at %q", socketPath) |
| 55 | + defer func() { |
| 56 | + if err := cleanup(); err != nil { |
| 57 | + logrus.Errorf("cleaning up: %v", err) |
| 58 | + } |
| 59 | + }() |
| 60 | + |
| 61 | + s := grpc.NewServer() |
| 62 | + noop.Register(s) |
| 63 | + reflection.Register(s) |
| 64 | + |
| 65 | + var errgroup errgroup.Group |
| 66 | + errgroup.Go(func() error { |
| 67 | + if err := s.Serve(listener); err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + return nil |
| 71 | + }) |
| 72 | + defer func() { |
| 73 | + s.GracefulStop() // closes the listening socket |
| 74 | + if err := errgroup.Wait(); err != nil { |
| 75 | + logrus.Errorf("while waiting for rpc service to shut down: %v", err) |
| 76 | + } |
| 77 | + }() |
| 78 | + cmd := exec.Command(args[0], args[1:]...) |
| 79 | + cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr |
| 80 | + envVar := c.Flag("env").Value.String() |
| 81 | + if envVar != "" { |
| 82 | + cmd.Env = append(slices.Clone(cmd.Environ()), envVar+"="+"unix://"+socketPath) |
| 83 | + } |
| 84 | + return cmd.Run() |
| 85 | +} |
| 86 | + |
| 87 | +func init() { |
| 88 | + var rpcOptions struct { |
| 89 | + envVar string |
| 90 | + listenPath string |
| 91 | + } |
| 92 | + rpcCommand.SetUsageTemplate(UsageTemplate()) |
| 93 | + flags := rpcCommand.Flags() |
| 94 | + flags.SetInterspersed(false) |
| 95 | + flags.StringVarP(&rpcOptions.envVar, "env", "e", "", "set environment `variable` to point to listening socket path") |
| 96 | + flags.StringVarP(&rpcOptions.listenPath, "listen", "l", "", "listening socket `path`") |
| 97 | + rootCmd.AddCommand(rpcCommand) |
| 98 | +} |
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