132 lines
3.8 KiB
Go
132 lines
3.8 KiB
Go
package common
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"time"
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"net/url"
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)
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// PackerKeyEnv is used to specify the key interval (delay) between keystrokes
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// sent to the VM, typically in boot commands. This is to prevent host CPU
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// utilization from causing key presses to be skipped or repeated incorrectly.
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const PackerKeyEnv = "PACKER_KEY_INTERVAL"
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// PackerKeyDefault 100ms is appropriate for shared build infrastructure while a
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// shorter delay (e.g. 10ms) can be used on a workstation. See PackerKeyEnv.
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const PackerKeyDefault = 100 * time.Millisecond
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// ScrubConfig is a helper that returns a string representation of
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// any struct with the given values stripped out.
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func ScrubConfig(target interface{}, values ...string) string {
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conf := fmt.Sprintf("Config: %+v", target)
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for _, value := range values {
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if value == "" {
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continue
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}
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conf = strings.Replace(conf, value, "<Filtered>", -1)
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}
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return conf
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}
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// ChooseString returns the first non-empty value.
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func ChooseString(vals ...string) string {
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for _, el := range vals {
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if el != "" {
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return el
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}
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}
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return ""
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}
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// DownloadableURL processes a URL that may also be a file path and returns
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// a completely valid URL. For example, the original URL might be "local/file.iso"
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// which isn't a valid URL. DownloadableURL will return "file:///local/file.iso"
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func DownloadableURL(original string) (string, error) {
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// Verify that the scheme is something we support in our common downloader.
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supported := []string{"file", "http", "https", "ftp", "smb"}
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found := false
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for _, s := range supported {
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if strings.HasPrefix(strings.ToLower(original), s + "://") {
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found = true
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break
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}
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}
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// If it's properly prefixed with something we support, then we don't need
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// to make it a uri.
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if found {
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original = filepath.ToSlash(original)
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// make sure that it can be parsed though..
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uri,err := url.Parse(original)
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if err != nil { return "", err }
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uri.Scheme = strings.ToLower(uri.Scheme)
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return uri.String(), nil
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}
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// If the file exists, then make it an absolute path
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_,err := os.Stat(original)
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if err == nil {
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original, err = filepath.Abs(filepath.FromSlash(original))
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if err != nil { return "", err }
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original, err = filepath.EvalSymlinks(original)
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if err != nil { return "", err }
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original = filepath.Clean(original)
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original = filepath.ToSlash(original)
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}
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// Since it wasn't properly prefixed, let's make it into a well-formed
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// file:// uri.
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return "file://" + original, nil
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}
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// FileExistsLocally takes the URL output from DownloadableURL, and determines
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// whether it is present on the file system.
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// example usage:
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//
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// myFile, err = common.DownloadableURL(c.SourcePath)
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// ...
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// fileExists := common.StatURL(myFile)
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// possible output:
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// true -- should occur if the file is present, or if the file is not present,
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// but is not supposed to be (e.g. the schema is http://, not file://)
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// false -- should occur if there was an error stating the file, so the
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// file is not present when it should be.
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func FileExistsLocally(original string) bool {
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// original should be something like file://C:/my/path.iso
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fileURL, _ := url.Parse(original)
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fileExists := false
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if fileURL.Scheme == "file" {
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// on windows, correct URI is file:///c:/blah/blah.iso.
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// url.Parse will pull out the scheme "file://" and leave the path as
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// "/c:/blah/blah/iso". Here we remove this forward slash on absolute
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// Windows file URLs before processing
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// see https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/
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// for more info about valid windows URIs
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filePath := fileURL.Path
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if runtime.GOOS == "windows" && len(filePath) > 0 && filePath[0] == '/' {
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filePath = filePath[1:]
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}
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_, err := os.Stat(filePath)
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if err != nil {
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return fileExists
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} else {
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fileExists = true
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}
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}
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return fileExists
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}
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