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Implement "runme beta session" (#683)
It implements a new command that allows starting a session and collecting all exported environment variables throughout its lifetime. ## Testing As a prerequisite, add the following to your shell's startup script (`.bashrc` or `.zshrc`): ``` # runme source <(runme beta session setup) ``` Then, you can start a new session in the terminal: ``` runme beta session ``` The session is a regular shell of your choice, inferred from `$SHELL`. You can use it like a normal shell, but any exported environment variables will be returned upon exiting the session via `exit`. Currently, the collected variables are printed out, but in the future, they will be routed to a proper store. --------- Co-authored-by: Sebastian (Tiedtke) Huckleberry <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,197 @@ | ||
| package beta | ||
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| import ( | ||
| "context" | ||
| "io" | ||
| "os" | ||
| "os/exec" | ||
| "strconv" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/spf13/cobra" | ||
| "go.uber.org/multierr" | ||
| "go.uber.org/zap" | ||
|
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| "github.com/stateful/runme/v3/internal/command" | ||
| "github.com/stateful/runme/v3/internal/config/autoconfig" | ||
| runnerv2 "github.com/stateful/runme/v3/pkg/api/gen/proto/go/runme/runner/v2" | ||
| ) | ||
|
|
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| func sessionCmd(*commonFlags) *cobra.Command { | ||
| cmd := cobra.Command{ | ||
| Use: "session", | ||
| Short: "Start shell within a session.", | ||
| Long: `Start shell within a session. | ||
| All exported variables during the session will be available to the subsequent commands. | ||
| `, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| return autoconfig.InvokeForCommand( | ||
| func( | ||
| cmdFactory command.Factory, | ||
| logger *zap.Logger, | ||
| ) error { | ||
| defer logger.Sync() | ||
|
|
||
| envs, err := executeDefaultShellProgram( | ||
| cmd.Context(), | ||
| cmdFactory, | ||
| cmd.InOrStdin(), | ||
| cmd.OutOrStdout(), | ||
| cmd.ErrOrStderr(), | ||
| nil, | ||
| ) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // TODO(adamb): currently, the collected env are printed out, | ||
| // but they could be put in a session. | ||
| if _, err := cmd.ErrOrStderr().Write([]byte("Collected env during the session:\n")); err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
|
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| for _, env := range envs { | ||
| _, err := cmd.OutOrStdout().Write([]byte(env + "\n")) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| } | ||
|
|
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| return nil | ||
| }, | ||
| ) | ||
| }, | ||
| } | ||
|
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| cmd.AddCommand(sessionSetupCmd()) | ||
|
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| return &cmd | ||
| } | ||
|
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| func executeDefaultShellProgram( | ||
| ctx context.Context, | ||
| commandFactory command.Factory, | ||
| stdin io.Reader, | ||
| stdout io.Writer, | ||
| stderr io.Writer, | ||
| additionalEnv []string, | ||
| ) ([]string, error) { | ||
| envCollector, err := command.NewEnvCollectorFactory().Build() | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
|
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| cfg := &command.ProgramConfig{ | ||
| ProgramName: defaultShell(), | ||
| Mode: runnerv2.CommandMode_COMMAND_MODE_CLI, | ||
| Env: append( | ||
| []string{command.CreateEnv(command.EnvNameTerminalSessionEnabled, "true")}, | ||
| append(envCollector.ExtraEnv(), additionalEnv...)..., | ||
| ), | ||
| } | ||
| options := command.CommandOptions{ | ||
| NoShell: true, | ||
| Stdin: stdin, | ||
| Stdout: stdout, | ||
| Stderr: stderr, | ||
| } | ||
| program, err := commandFactory.Build(cfg, options) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| err = program.Start(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| err = program.Wait(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| changed, _, err := envCollector.Diff() | ||
| return changed, err | ||
| } | ||
|
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| func defaultShell() string { | ||
| shell := os.Getenv("SHELL") | ||
| if shell == "" { | ||
| shell, _ = exec.LookPath("bash") | ||
| } | ||
| if shell == "" { | ||
| shell = "/bin/sh" | ||
| } | ||
| return shell | ||
| } | ||
|
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| func sessionSetupCmd() *cobra.Command { | ||
| var debug bool | ||
|
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| cmd := cobra.Command{ | ||
| Use: "setup", | ||
| Hidden: true, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| return autoconfig.InvokeForCommand( | ||
| func( | ||
| cmdFactory command.Factory, | ||
| logger *zap.Logger, | ||
| ) error { | ||
| defer logger.Sync() | ||
|
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| out := cmd.OutOrStdout() | ||
|
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| if err := requireEnvs( | ||
| command.EnvNameTerminalSessionEnabled, | ||
| command.EnvNameTerminalSessionPrePath, | ||
| command.EnvNameTerminalSessionPostPath, | ||
| ); err != nil { | ||
| logger.Info("session setup is skipped because the environment variable is not set", zap.Error(err)) | ||
| return writeNoopShellCommand(out) | ||
| } | ||
|
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| sessionSetupEnabled := os.Getenv(command.EnvNameTerminalSessionEnabled) | ||
| if val, err := strconv.ParseBool(sessionSetupEnabled); err != nil || !val { | ||
| logger.Debug("session setup is skipped", zap.Error(err), zap.Bool("value", val)) | ||
| return writeNoopShellCommand(out) | ||
| } | ||
|
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| envSetter := command.NewScriptEnvSetter( | ||
| os.Getenv(command.EnvNameTerminalSessionPrePath), | ||
| os.Getenv(command.EnvNameTerminalSessionPostPath), | ||
| debug, | ||
| ) | ||
| if err := envSetter.SetOnShell(out); err != nil { | ||
| return err | ||
| } | ||
|
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| if _, err := cmd.ErrOrStderr().Write([]byte("Runme session active. When you're done, execute \"exit\".\n")); err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
|
|
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| return nil | ||
| }, | ||
| ) | ||
| }, | ||
| } | ||
|
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| cmd.Flags().BoolVar(&debug, "debug", false, "Enable debug mode.") | ||
|
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| return &cmd | ||
| } | ||
|
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| func requireEnvs(names ...string) error { | ||
| var err error | ||
| for _, name := range names { | ||
| if os.Getenv(name) == "" { | ||
| err = multierr.Append(err, errors.Errorf("environment variable %q is required", name)) | ||
| } | ||
| } | ||
| return err | ||
| } | ||
|
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| func writeNoopShellCommand(w io.Writer) error { | ||
| _, err := w.Write([]byte(":")) | ||
| return errors.WithStack(err) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -75,6 +75,7 @@ func (c *terminalCommand) Wait(ctx context.Context) (err error) { | |
| err = cErr | ||
| } | ||
| } | ||
|
|
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| return err | ||
| } | ||
|
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|
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