github.com/mmcquillan/packer@v1.1.1-0.20171009221028-c85cf0483a5d/command/version.go (about)

     1  package command
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  )
     7  
     8  // VersionCommand is a Command implementation prints the version.
     9  type VersionCommand struct {
    10  	Meta
    11  
    12  	Revision          string
    13  	Version           string
    14  	VersionPrerelease string
    15  	CheckFunc         VersionCheckFunc
    16  }
    17  
    18  // VersionCheckFunc is the callback called by the Version command to
    19  // check if there is a new version of Packer.
    20  type VersionCheckFunc func() (VersionCheckInfo, error)
    21  
    22  // VersionCheckInfo is the return value for the VersionCheckFunc callback
    23  // and tells the Version command information about the latest version
    24  // of Packer.
    25  type VersionCheckInfo struct {
    26  	Outdated bool
    27  	Latest   string
    28  	Alerts   []string
    29  }
    30  
    31  func (c *VersionCommand) Help() string {
    32  	return ""
    33  }
    34  
    35  func (c *VersionCommand) Run(args []string) int {
    36  	c.Ui.Machine("version", c.Version)
    37  	c.Ui.Machine("version-prelease", c.VersionPrerelease)
    38  	c.Ui.Machine("version-commit", c.Revision)
    39  
    40  	var versionString bytes.Buffer
    41  	fmt.Fprintf(&versionString, "Packer v%s", c.Version)
    42  	if c.VersionPrerelease != "" {
    43  		fmt.Fprintf(&versionString, "-%s", c.VersionPrerelease)
    44  
    45  		if c.Revision != "" {
    46  			fmt.Fprintf(&versionString, " (%s)", c.Revision)
    47  		}
    48  	}
    49  
    50  	c.Ui.Say(versionString.String())
    51  
    52  	// If we have a version check function, then let's check for
    53  	// the latest version as well.
    54  	if c.CheckFunc != nil {
    55  
    56  		// Check the latest version
    57  		info, err := c.CheckFunc()
    58  		if err != nil {
    59  			c.Ui.Error(fmt.Sprintf(
    60  				"\nError checking latest version: %s", err))
    61  		}
    62  		if info.Outdated {
    63  			c.Ui.Say(fmt.Sprintf(
    64  				"\nYour version of Packer is out of date! The latest version\n"+
    65  					"is %s. You can update by downloading from www.packer.io",
    66  				info.Latest))
    67  		}
    68  	}
    69  
    70  	return 0
    71  }
    72  
    73  func (c *VersionCommand) Synopsis() string {
    74  	return "Prints the Packer version"
    75  }