forked from cloudposse/atmos
/
shell_utils.go
207 lines (173 loc) · 5.39 KB
/
shell_utils.go
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package exec
import (
"bytes"
"context"
"fmt"
"io"
"os"
"os/exec"
"runtime"
"strings"
u "github.com/cloudposse/atmos/pkg/utils"
"mvdan.cc/sh/v3/expand"
"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
// ExecuteShellCommand prints and executes the provided command with args and flags
func ExecuteShellCommand(command string, args []string, dir string, env []string, dryRun bool, verbose bool) error {
cmd := exec.Command(command, args...)
cmd.Env = append(os.Environ(), env...)
cmd.Dir = dir
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if verbose {
u.PrintInfo("\nExecuting command:")
fmt.Println(cmd.String())
}
if dryRun {
return nil
}
return cmd.Run()
}
// ExecuteShell runs a shell script
func ExecuteShell(command string, name string, dir string, env []string, dryRun bool, verbose bool) error {
if verbose {
u.PrintInfo("\nExecuting command:")
fmt.Println(command)
}
if dryRun {
return nil
}
return shellRunner(command, name, dir, env, os.Stdout)
}
// ExecuteShellAndReturnOutput runs a shell script and capture its standard output
func ExecuteShellAndReturnOutput(command string, name string, dir string, env []string, dryRun bool, verbose bool) (string, error) {
var b bytes.Buffer
if verbose {
u.PrintInfo("\nExecuting command:")
fmt.Println(command)
}
if dryRun {
return "", nil
}
err := shellRunner(command, name, dir, env, &b)
if err != nil {
return "", err
}
return b.String(), nil
}
// shellRunner uses mvdan.cc/sh/v3's parser and interpreter to run a shell script and divert its stdout
func shellRunner(command string, name string, dir string, env []string, out io.Writer) error {
parser, err := syntax.NewParser().Parse(strings.NewReader(command), name)
if err != nil {
return err
}
environ := append(os.Environ(), env...)
listEnviron := expand.ListEnviron(environ...)
runner, err := interp.New(
interp.Dir(dir),
interp.Env(listEnviron),
interp.StdIO(os.Stdin, out, os.Stderr),
)
if err != nil {
return err
}
return runner.Run(context.TODO(), parser)
}
// ExecuteShellCommandAndReturnOutput prints and executes the provided command with args and flags and returns the command output
func ExecuteShellCommandAndReturnOutput(command string, args []string, dir string, env []string, dryRun bool, verbose bool) (string, error) {
cmd := exec.Command(command, args...)
cmd.Env = append(os.Environ(), env...)
cmd.Dir = dir
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
if verbose {
u.PrintInfo("\nExecuting command:")
fmt.Println(cmd.String())
}
if dryRun {
return "", nil
}
output, err := cmd.Output()
if err != nil {
return "", err
}
return string(output), nil
}
// ExecuteShellCommands sequentially executes the provided list of commands
func ExecuteShellCommands(commands []string, dir string, env []string, dryRun bool, verbose bool) error {
for _, command := range commands {
args := strings.Fields(command)
if len(args) > 0 {
if err := ExecuteShellCommand(args[0], args[1:], dir, env, dryRun, verbose); err != nil {
return err
}
}
}
return nil
}
// execTerraformShellCommand executes `terraform shell` command by starting a new interactive shell
func execTerraformShellCommand(
component string,
stack string,
componentEnvList []string,
varFile string,
workingDir string,
workspaceName string,
componentPath string) error {
componentEnvList = append(componentEnvList, fmt.Sprintf("TF_CLI_ARGS_plan=-var-file=%s", varFile))
componentEnvList = append(componentEnvList, fmt.Sprintf("TF_CLI_ARGS_apply=-var-file=%s", varFile))
componentEnvList = append(componentEnvList, fmt.Sprintf("TF_CLI_ARGS_refresh=-var-file=%s", varFile))
componentEnvList = append(componentEnvList, fmt.Sprintf("TF_CLI_ARGS_import=-var-file=%s", varFile))
componentEnvList = append(componentEnvList, fmt.Sprintf("TF_CLI_ARGS_destroy=-var-file=%s", varFile))
componentEnvList = append(componentEnvList, fmt.Sprintf("TF_CLI_ARGS_console=-var-file=%s", varFile))
fmt.Println()
u.PrintInfo("Starting a new interactive shell where you can execute all native Terraform commands (type 'exit' to go back)")
fmt.Printf("Component: %s\n", component)
fmt.Printf("Stack: %s\n", stack)
fmt.Printf("Working directory: %s\n", workingDir)
fmt.Printf("Terraform workspace: %s\n", workspaceName)
fmt.Println()
u.PrintInfo("Setting the ENV vars in the shell:\n")
for _, v := range componentEnvList {
fmt.Println(v)
}
fmt.Println()
// Transfer stdin, stdout, and stderr to the new process and also set the target directory for the shell to start in
pa := os.ProcAttr{
Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
Dir: componentPath,
Env: append(os.Environ(), componentEnvList...),
}
// Start a new shell
var shellCommand string
if runtime.GOOS == "windows" {
shellCommand = "cmd.exe"
} else {
// If 'SHELL' ENV var is not defined, use 'bash' shell
shellCommand = os.Getenv("SHELL")
if len(shellCommand) == 0 {
bashPath, err := exec.LookPath("bash")
if err != nil {
return err
}
shellCommand = bashPath
}
shellCommand = shellCommand + " -l"
}
u.PrintInfo(fmt.Sprintf("Starting process: %s", shellCommand))
fmt.Println()
args := strings.Fields(shellCommand)
proc, err := os.StartProcess(args[0], args[1:], &pa)
if err != nil {
return err
}
// Wait until user exits the shell
state, err := proc.Wait()
if err != nil {
return err
}
fmt.Printf("Exited shell: %s\n", state.String())
return nil
}