github.com/niedbalski/juju@v0.0.0-20190215020005-8ff100488e47/version/version.go (about)

     1  // Copyright 2012, 2013 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  // Package version contains versioning information for juju.  It also
     5  // acts as guardian of the current client Juju version number.
     6  package version
     7  
     8  import (
     9  	"fmt"
    10  	"io/ioutil"
    11  	"os"
    12  	"path/filepath"
    13  	"runtime"
    14  	"strings"
    15  
    16  	semversion "github.com/juju/version"
    17  )
    18  
    19  // The presence and format of this constant is very important.
    20  // The debian/rules build recipe uses this value for the version
    21  // number of the release package.
    22  const version = "2.6-beta1"
    23  
    24  // The version that we switched over from old style numbering to new style.
    25  var switchOverVersion = semversion.MustParse("1.19.9")
    26  
    27  // Current gives the current version of the system.  If the file
    28  // "FORCE-VERSION" is present in the same directory as the running
    29  // binary, it will override this.
    30  var Current = semversion.MustParse(version)
    31  
    32  var Compiler = runtime.Compiler
    33  
    34  func init() {
    35  	toolsDir := filepath.Dir(os.Args[0])
    36  	v, err := ioutil.ReadFile(filepath.Join(toolsDir, "FORCE-VERSION"))
    37  	if err != nil {
    38  		if !os.IsNotExist(err) {
    39  			fmt.Fprintf(os.Stderr, "WARNING: cannot read forced version: %v\n", err)
    40  		}
    41  		return
    42  	}
    43  	Current = semversion.MustParse(strings.TrimSpace(string(v)))
    44  }
    45  
    46  func isOdd(x int) bool {
    47  	return x%2 != 0
    48  }
    49  
    50  // IsDev returns whether the version represents a development version. A
    51  // version with a tag or a nonzero build component is considered to be a
    52  // development version.  Versions older than or equal to 1.19.3 (the switch
    53  // over time) check for odd minor versions.
    54  func IsDev(v semversion.Number) bool {
    55  	if v.Compare(switchOverVersion) <= 0 {
    56  		return isOdd(v.Minor) || v.Build > 0
    57  	}
    58  	return v.Tag != "" || v.Build > 0
    59  }