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package goenv
import (
"errors"
"fmt"
"io"
"io/ioutil"
"path/filepath"
"regexp"
"strings"
)
// Version of TinyGo.
// Update this value before release of new version of software.
const Version = "0.19.0-dev"
// GetGorootVersion returns the major and minor version for a given GOROOT path.
// If the goroot cannot be determined, (0, 0) is returned.
func GetGorootVersion(goroot string) (major, minor int, err error) {
s, err := GorootVersionString(goroot)
if err != nil {
return 0, 0, err
}
if s == "" || s[:2] != "go" {
return 0, 0, errors.New("could not parse Go version: version does not start with 'go' prefix")
}
parts := strings.Split(s[2:], ".")
if len(parts) < 2 {
return 0, 0, errors.New("could not parse Go version: version has less than two parts")
}
// Ignore the errors, we don't really handle errors here anyway.
var trailing string
n, err := fmt.Sscanf(s, "go%d.%d%s", &major, &minor, &trailing)
if n == 2 && err == io.EOF {
// Means there were no trailing characters (i.e., not an alpha/beta)
err = nil
}
if err != nil {
return 0, 0, fmt.Errorf("failed to parse version: %s", err)
}
return
}
// GorootVersionString returns the version string as reported by the Go
// toolchain for the given GOROOT path. It is usually of the form `go1.x.y` but
// can have some variations (for beta releases, for example).
func GorootVersionString(goroot string) (string, error) {
if data, err := ioutil.ReadFile(filepath.Join(
goroot, "src", "runtime", "internal", "sys", "zversion.go")); err == nil {
r := regexp.MustCompile("const TheVersion = `(.*)`")
matches := r.FindSubmatch(data)
if len(matches) != 2 {
return "", errors.New("Invalid go version output:\n" + string(data))
}
return string(matches[1]), nil
} else if data, err := ioutil.ReadFile(filepath.Join(goroot, "VERSION")); err == nil {
return string(data), nil
} else {
return "", err
}
}
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