57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
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package client
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import (
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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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)
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// Program is an interface to execute external programs.
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type Program interface {
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Output() ([]byte, error)
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Input(in io.Reader)
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}
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// ProgramFunc is a type of function that initializes programs based on arguments.
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type ProgramFunc func(args ...string) Program
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// NewShellProgramFunc creates programs that are executed in a Shell.
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func NewShellProgramFunc(name string) ProgramFunc {
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return NewShellProgramFuncWithEnv(name, nil)
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}
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// NewShellProgramFuncWithEnv creates programs that are executed in a Shell with environment variables
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func NewShellProgramFuncWithEnv(name string, env *map[string]string) ProgramFunc {
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return func(args ...string) Program {
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return &Shell{cmd: createProgramCmdRedirectErr(name, args, env)}
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}
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}
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func createProgramCmdRedirectErr(commandName string, args []string, env *map[string]string) *exec.Cmd {
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programCmd := exec.Command(commandName, args...)
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programCmd.Env = os.Environ()
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if env != nil {
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for k, v := range *env {
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programCmd.Env = append(programCmd.Env, fmt.Sprintf("%s=%s", k, v))
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}
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}
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programCmd.Stderr = os.Stderr
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return programCmd
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}
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// Shell invokes shell commands to talk with a remote credentials helper.
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type Shell struct {
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cmd *exec.Cmd
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}
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// Output returns responses from the remote credentials helper.
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func (s *Shell) Output() ([]byte, error) {
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return s.cmd.Output()
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}
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// Input sets the input to send to a remote credentials helper.
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func (s *Shell) Input(in io.Reader) {
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s.cmd.Stdin = in
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}
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