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package command
import (
"bytes"
"fmt"
)
// VersionCommand is a Command implementation prints the version.
type VersionCommand struct {
Meta
Revision string
Version string
VersionPrerelease string
CheckFunc VersionCheckFunc
}
// VersionCheckFunc is the callback called by the Version command to
// check if there is a new version of Packer.
type VersionCheckFunc func() (VersionCheckInfo, error)
// VersionCheckInfo is the return value for the VersionCheckFunc callback
// and tells the Version command information about the latest version
// of Packer.
type VersionCheckInfo struct {
Outdated bool
Latest string
Alerts []string
}
func (c *VersionCommand) Help() string {
return ""
}
func (c *VersionCommand) Run(args []string) int {
c.Ui.Machine("version", c.Version)
c.Ui.Machine("version-prelease", c.VersionPrerelease)
c.Ui.Machine("version-commit", c.Revision)
var versionString bytes.Buffer
fmt.Fprintf(&versionString, "Packer v%s", c.Version)
if c.VersionPrerelease != "" {
fmt.Fprintf(&versionString, ".%s", c.VersionPrerelease)
if c.Revision != "" {
fmt.Fprintf(&versionString, " (%s)", c.Revision)
}
}
c.Ui.Say(versionString.String())
// If we have a version check function, then let's check for
// the latest version as well.
if c.CheckFunc != nil {
// Separate the prior output with a newline
c.Ui.Say("")
// Check the latest version
info, err := c.CheckFunc()
if err != nil {
c.Ui.Error(fmt.Sprintf(
"Error checking latest version: %s", err))
}
if info.Outdated {
c.Ui.Say(fmt.Sprintf(
"Your version of Packer is out of date! The latest version\n"+
"is %s. You can update by downloading from www.packer.io",
info.Latest))
}
}
return 0
}
func (c *VersionCommand) Synopsis() string {
return "Prints the Packer version"
}
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