github.com/tinygo-org/tinygo@v0.31.3-0.20240404173401-90b0bf646c27/goenv/version.go (about)

     1  package goenv
     2  
     3  import (
     4  	"errors"
     5  	"fmt"
     6  	"io"
     7  	"strings"
     8  )
     9  
    10  // Version of TinyGo.
    11  // Update this value before release of new version of software.
    12  const version = "0.32.0-dev"
    13  
    14  var (
    15  	// This variable is set at build time using -ldflags parameters.
    16  	// See: https://stackoverflow.com/a/11355611
    17  	GitSha1 string
    18  )
    19  
    20  // Return TinyGo version, either in the form 0.30.0 or as a development version
    21  // (like 0.30.0-dev-abcd012).
    22  func Version() string {
    23  	v := version
    24  	if strings.HasSuffix(version, "-dev") && GitSha1 != "" {
    25  		v += "-" + GitSha1
    26  	}
    27  	return v
    28  }
    29  
    30  // GetGorootVersion returns the major and minor version for a given GOROOT path.
    31  // If the goroot cannot be determined, (0, 0) is returned.
    32  func GetGorootVersion() (major, minor int, err error) {
    33  	s, err := GorootVersionString()
    34  	if err != nil {
    35  		return 0, 0, err
    36  	}
    37  
    38  	if s == "" || s[:2] != "go" {
    39  		return 0, 0, errors.New("could not parse Go version: version does not start with 'go' prefix")
    40  	}
    41  
    42  	parts := strings.Split(s[2:], ".")
    43  	if len(parts) < 2 {
    44  		return 0, 0, errors.New("could not parse Go version: version has less than two parts")
    45  	}
    46  
    47  	// Ignore the errors, we don't really handle errors here anyway.
    48  	var trailing string
    49  	n, err := fmt.Sscanf(s, "go%d.%d%s", &major, &minor, &trailing)
    50  	if n == 2 && err == io.EOF {
    51  		// Means there were no trailing characters (i.e., not an alpha/beta)
    52  		err = nil
    53  	}
    54  	if err != nil {
    55  		return 0, 0, fmt.Errorf("failed to parse version: %s", err)
    56  	}
    57  	return
    58  }
    59  
    60  // GorootVersionString returns the version string as reported by the Go
    61  // toolchain. It is usually of the form `go1.x.y` but can have some variations
    62  // (for beta releases, for example).
    63  func GorootVersionString() (string, error) {
    64  	err := readGoEnvVars()
    65  	return goEnvVars.GOVERSION, err
    66  }