blob: 945c261b6e333d11a40bd8129e37fce11c7b5a52 [file] [log] [blame]
// Package common has functions useful across its peer modules.
package common
import (
const commandTimeout = 5 * time.Second
// TrimmedCommandOutput runs a command and returns its combined stdout and stdrerr
// (whitespace-trimmed), timing out after a period prescribed by commandTimeout. If the command
// returns a non-zero exit code, returned error is an exec.ExitError.
// idevice commands tend to return everything--both errors and normal output--on stderr. However,
// they don't advertise that as part of their contract, so we take both stdout and stderr for
// durability.
func TrimmedCommandOutput(ctx context.Context, commandName string, args ...string) (string, error) {
ctx, cancel := context.WithTimeout(ctx, commandTimeout)
defer cancel()
cmd := executil.CommandContext(ctx, commandName, args...)
outputBytes, err := cmd.CombinedOutput()
return strings.TrimSpace(string(outputBytes)), err // lop off newline