// Install copies the script into upload directory and fix its permissions.
func (s *SourceScriptHandler) Install(r *api.InstallResult) error {
	dst := filepath.Join(s.DestinationDir, api.UploadScripts, r.Script)
	if err := s.fs.Rename(r.URL, dst); err != nil {
		return err
	}
	if err := s.fs.Chmod(dst, 0755); err != nil {
		return err
	}
	// Make the path to scripts nicer in logs
	parts := strings.Split(r.URL, "/")
	if len(parts) > 3 {
		r.URL = sourcesRootAbbrev + strings.Join(parts[len(parts)-3:], "/")
	}
	r.Installed = true
	r.Downloaded = true
	return nil
}

func (i *installer) install(scripts []string, userResults, sourceResults, defaultResults map[string]*downloadResult, dstDir string) []api.InstallResult {
	resultList := make([]api.InstallResult, len(scripts))

	locationsResultsMap := map[string]map[string]*downloadResult{
		api.UserScripts:    userResults,
		api.SourceScripts:  sourceResults,
		api.DefaultScripts: defaultResults,
	}

	// iterate over scripts
	for idx, script := range scripts {
		result := api.InstallResult{Script: script}

		// and possible locations
		for _, location := range locationsOrder {
			locationResults, ok := locationsResultsMap[location]
			if !ok || locationResults == nil {
				continue
			}
			downloadResult, ok := locationResults[script]
			if !ok {
				continue
			}
			result.URL = downloadResult.location

			// if location results are erroneous we store error in result object
			// and continue searching other locations
			if downloadResult.err != nil {
				// one exception is when error contains information about scripts being inside the image
				if e, ok := downloadResult.err.(errors.Error); ok && e.ErrorCode == errors.ScriptsInsideImageError {
					// in which case update result object and break further searching
					result.Error = nil
					result.Downloaded = false
					result.Installed = true
					break
				} else {
					result.Error = downloadResult.err
					continue
				}
			}

			// if there was no error
			src := filepath.Join(dstDir, location, script)
			dst := filepath.Join(dstDir, api.UploadScripts, script)
			// move script to upload directory
			if err := i.fs.Rename(src, dst); err != nil {
				result.Error = err
				continue
			}
			// set appropriate permissions
			if err := i.fs.Chmod(dst, 0755); err != nil {
				result.Error = err
				continue
			}
			// and finally update result object
			result.Error = nil
			result.Downloaded = true
			result.Installed = true
			break
		}
		resultList[idx] = result
	}

	return resultList
}