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vm: add support for custom disk images (#1216)
* vm: add support for custom disk images Signed-off-by: Abiola Ibrahim <[email protected]> * chore: refactor sha validation Signed-off-by: Abiola Ibrahim <[email protected]> * vm: improve support for custom disk image Signed-off-by: Abiola Ibrahim <[email protected]> --------- Signed-off-by: Abiola Ibrahim <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package downloader | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| // SHA is the shasum of a file. | ||
| type SHA struct { | ||
| Digest string // shasum | ||
| URL string // url to download the shasum file (if Digest is empty) | ||
| Size int // one of 256 or 512 | ||
| } | ||
|
|
||
| // ValidateFile validates the SHA of the file. | ||
| func (s SHA) ValidateFile(host hostActions, file string) error { | ||
| dir, filename := filepath.Split(file) | ||
| digest := strings.TrimPrefix(s.Digest, fmt.Sprintf("sha%d:", s.Size)) | ||
|
|
||
| script := strings.NewReplacer( | ||
| "{dir}", dir, | ||
| "{digest}", digest, | ||
| "{size}", strconv.Itoa(s.Size), | ||
| "{filename}", filename, | ||
| ).Replace( | ||
| `cd {dir} && echo "{digest} {filename}" | shasum -a {size} --check --status`, | ||
| ) | ||
|
|
||
| return host.Run("sh", "-c", script) | ||
| } | ||
|
|
||
| func (s SHA) validateDownload(host hostActions, url string, filename string) error { | ||
| if s.URL == "" && s.Digest == "" { | ||
| return fmt.Errorf("error validating SHA: one of Digest or URL must be set") | ||
| } | ||
|
|
||
| // fetch digest from URL if empty | ||
| if s.Digest == "" { | ||
| // retrieve the filename from the download url. | ||
| filename := func() string { | ||
| if url == "" { | ||
| return "" | ||
| } | ||
| split := strings.Split(url, "/") | ||
| return split[len(split)-1] | ||
| }() | ||
|
|
||
| digest, err := fetchSHAFromURL(host, s.URL, filename) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| s.Digest = digest | ||
| } | ||
|
|
||
| return s.ValidateFile(host, filename) | ||
| } | ||
|
|
||
| func fetchSHAFromURL(host hostActions, url, filename string) (string, error) { | ||
| script := strings.NewReplacer( | ||
| "{url}", url, | ||
| "{filename}", filename, | ||
| ).Replace( | ||
| "curl -sL {url} | grep ' {filename}$' | awk -F' ' '{print $1}'", | ||
| ) | ||
| sha, err := host.RunOutput("sh", "-c", script) | ||
| if err != nil { | ||
| return "", fmt.Errorf("error retrieving sha from url '%s': %w", url, err) | ||
| } | ||
| return strings.TrimSpace(sha), nil | ||
| } |