// Install executes the apt-get command to install the named package. If the
// version is specified, the version is also passed to apt-get command.
func Install(name string, version string) error {
args := []string{"install", "-y"}
args = append(args, InstallOptions...)
if version != "" {
args = append(args, exec.ShellEscape(name+"="+version))
} else {
args = append(args, exec.ShellEscape(name))
}
cmd := exec.Command(APTGetPath, args...)
cmd.Env = append(cmd.Env, os.Environ()...)
cmd.Env = append(cmd.Env, "DEBIAN_FRONTEND=noninteractive")
return cmd.Run()
}
// IsNotInstalled tests whether the named package is not installed on the system.
// If the package is installed or execution fails, it returns an error.
func IsNotInstalled(name string) error {
cmd := exec.Command(DPKGQueryPath, "--show", exec.ShellEscape(name))
cmd.Env = append(cmd.Env, os.Environ()...)
out, err := cmd.CombinedOutput()
if err != nil {
// TODO:
// I could not find the apt/dpkg command to retrieve status of uninstalled
// package. just check output message.
if bytes.Contains(out, []byte("no packages found")) {
return nil
}
return err
}
return errors.New("the package is installed")
}
// IsInstalled tests whether the named package is installed on the system.
// If the named package is not installed, or the execution fails, it returns
// an error.
//
// If the version is specified, it checks whether the specified version is
// linked.
//
// To test whether the package is NOT installed, Use IsNotInstalled function
// instead of this.
func IsInstalled(name string, version string) error {
cmd := exec.Command(DPKGQueryPath, "--showformat=${Status}\\n${Version}", "--show", exec.ShellEscape(name))
cmd.Env = append(cmd.Env, os.Environ()...)
out, err := cmd.Output()
if err != nil {
return err
}
if !bytes.HasPrefix(out, []byte("install ok installed\n")) {
return errors.New("the package is not installed")
}
if version != "" {
if i := bytes.IndexRune(out, '\n'); i > 0 {
if !bytes.HasPrefix(out[i+1:], []byte(version)) {
return errors.New("the different version is installed")
}
} else {
return errors.New("failed to parse the result of dpkg-query")
}
}
return nil
}
// Remove executes the apt-get command to remove the named package.
func Remove(name string) error {
cmd := exec.Command(APTGetPath, "remove", "-y", exec.ShellEscape(name))
cmd.Env = append(cmd.Env, os.Environ()...)
cmd.Env = append(cmd.Env, "DEBIAN_FRONTEND=noninteractive")
return cmd.Run()
}