// LatestVersion returns latest version for specific package
func (m *Manifest) LatestVersion(log log.T, context *updateutil.InstanceContext, packageName string) (result string, err error) {
var version = minimumVersion
var compareResult = 0
for _, p := range m.Packages {
if p.Name == packageName {
for _, f := range p.Files {
if f.Name == context.FileName(packageName) {
for _, v := range f.AvailableVersions {
if compareResult, err = updateutil.VersionCompare(v.Version, version); err != nil {
return version, err
}
if compareResult > 0 {
version = v.Version
}
}
}
}
}
}
if version == minimumVersion {
log.Debugf("Filename: %v", context.FileName(packageName))
log.Debugf("Package Name: %v", packageName)
log.Debugf("Manifest: %v", m)
return version, fmt.Errorf("cannot find the latest version for package %v", packageName)
}
return version, nil
}
// updateRoot returns the platform specific path to update artifacts
func updateRoot(detail *processor.UpdateDetail) error {
compareResult, err := updateutil.VersionCompare(detail.SourceVersion, firstAgentWithNewUpdaterPath)
if err != nil {
return err
}
// New versions that with new binary locations
if compareResult >= 0 {
detail.UpdateRoot = appconfig.UpdaterArtifactsRoot
} else {
detail.UpdateRoot = legacyUpdaterArtifactsRoot
}
return nil
}
// resolveUpdateDetail decides which UpdaterRoot to use and if uninstall is required for the agent
func resolveUpdateDetail(detail *processor.UpdateDetail) error {
compareResult, err := updateutil.VersionCompare(detail.SourceVersion, detail.TargetVersion)
if err != nil {
return err
}
// if performing a downgrade
if compareResult > 0 {
detail.RequiresUninstall = true
}
if err := updateRoot(detail); err != nil {
return err
}
return nil
}
// validateUpdateVersion validates target version number base on the current platform
// to avoid accidentally downgrade agent to the earlier version that doesn't support current platform
func validateUpdateVersion(log log.T, detail *UpdateDetail, instanceContext *updateutil.InstanceContext) (err error) {
compareResult := 0
minimumVersions := getMinimumVSupportedVersions()
// check if current platform has minimum supported version
if val, ok := (*minimumVersions)[instanceContext.Platform]; ok {
// compare current agent version with minimum supported version
if compareResult, err = updateutil.VersionCompare(detail.TargetVersion, val); err != nil {
return err
}
if compareResult < 0 {
return fmt.Errorf("Agent version %v is unsupported on current platform", detail.TargetVersion)
}
}
return nil
}