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packer-cn
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Do not re-download iso multiple times from different urls 

In case of two or more iso_urls checks for downloaded files prior to downloading them.
Speedups case when some iso already downloaded and another url prepended to iso_urls list.
This commit is contained in:
Vladislav Rassokhin 2017-11-26 00:02:54 +03:00
parent baacb7e173
commit af8a0c46c5
1 changed files with 31 additions and 14 deletions
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45
common/step_download.go
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@ -61,10 +61,12 @@ func (s *StepDownload) Run(state multistep.StateBag) multistep.StepAction {
ui.Say(fmt.Sprintf("Downloading or copying %s", s.Description))
var finalPath string
for _, url := range s.Url {
ui.Message(fmt.Sprintf("Downloading or copying: %s", url))
// First try to use any already downloaded file
// If it fails, proceed to regualar download logic
var downloadConfigs = make([]*DownloadConfig, len(s.Url))
var finalPath string
for i, url := range s.Url {
targetPath := s.TargetPath
if targetPath == "" {
// Determine a cache key. This is normally just the URL but
@ -90,22 +92,37 @@ func (s *StepDownload) Run(state multistep.StateBag) multistep.StepAction {
Checksum: checksum,
UserAgent: "Packer",
}
downloadConfigs[i] = config
path, err, retry := s.download(config, state)
if err != nil {
ui.Message(fmt.Sprintf("Error downloading: %s", err))
}
if !retry {
return multistep.ActionHalt
}
if err == nil {
finalPath = path
if match, _ := NewDownloadClient(config).VerifyChecksum(config.TargetPath); match {
ui.Message(fmt.Sprintf("Found already downloaded, initial checksum matched, no download needed: %s", url))
finalPath = config.TargetPath
break
}
}
if finalPath == "" {
for i, url := range s.Url {
ui.Message(fmt.Sprintf("Downloading or copying: %s", url))
config := downloadConfigs[i]
path, err, retry := s.download(config, state)
if err != nil {
ui.Message(fmt.Sprintf("Error downloading: %s", err))
}
if !retry {
return multistep.ActionHalt
}
if err == nil {
finalPath = path
break
}
}
}
if finalPath == "" {
err := fmt.Errorf("%s download failed.", s.Description)
state.Put("error", err)