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Do not assume GetManifest is called before other dockerImageSource methods

Browse Source 
Call dockerImageSource.ping() in .makeRequest() if needed, instead of
expecting a caller to do it (which only happened in GetManifest).

This required splitting the URLs into the baseURL (dependent on .ping()
result) and the suffix (independent of it), which was a simplification
anyway.

Also rename WWWAuthenticate to wwwAuthenticate, it is a private cache
field.
This commit is contained in:
Miloslav Trmač 2016-03-30 20:42:22 +02:00
parent 14bc664b48
commit 60fbdd3988
1 changed files with 21 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
docker.go
View File

@ -31,9 +31,9 @@ const (
dockerCfgObsolete = ".dockercfg"
baseURL = "%s://%s/v2/"
tagsURL = baseURL + "%s/tags/list"
manifestURL = baseURL + "%s/manifests/%s"
blobsURL = baseURL + "%s/blobs/%s"
tagsURL = "%s/tags/list"
manifestURL = "%s/manifests/%s"
blobsURL = "%s/blobs/%s"
)
var (
@ -86,7 +86,7 @@ func (i *dockerImage) Manifest() (types.ImageManifest, error) {
func (i *dockerImage) getTags() ([]string, error) {
// FIXME? Breaking the abstraction.
url := fmt.Sprintf(tagsURL, i.src.scheme, i.src.registry, i.src.ref.RemoteName())
url := fmt.Sprintf(tagsURL, i.src.ref.RemoteName())
res, err := i.src.makeRequest("GET", url, nil)
if err != nil {
return nil, err
@ -188,19 +188,13 @@ type dockerImageSource struct {
registry string
username string
password string
WWWAuthenticate string // Obtained by s.ping()
scheme string // Obtained by s.ping()
wwwAuthenticate string // Cache of a value set by ping() if scheme is not empty
scheme string // Cache of a value returned by a successful ping() if not empty
transport *http.Transport
}
func (s *dockerImageSource) GetManifest() (manifest []byte, unverifiedCanonicalDigest string, err error) {
pr, err := s.ping()
if err != nil {
return nil, "", err
}
s.WWWAuthenticate = pr.WWWAuthenticate
s.scheme = pr.scheme
url := fmt.Sprintf(manifestURL, s.scheme, s.registry, s.ref.RemoteName(), s.tag)
url := fmt.Sprintf(manifestURL, s.ref.RemoteName(), s.tag)
// TODO(runcom) set manifest version header! schema1 for now - then schema2 etc etc and v1
// TODO(runcom) NO, switch on the resulter manifest like Docker is doing
res, err := s.makeRequest("GET", url, nil)
@ -219,7 +213,7 @@ func (s *dockerImageSource) GetManifest() (manifest []byte, unverifiedCanonicalD
}
func (s *dockerImageSource) GetLayer(digest string) (io.ReadCloser, error) {
url := fmt.Sprintf(blobsURL, s.scheme, s.registry, s.ref.RemoteName(), digest)
url := fmt.Sprintf(blobsURL, s.ref.RemoteName(), digest)
logrus.Infof("Downloading %s", url)
res, err := s.makeRequest("GET", url, nil)
if err != nil {
@ -237,6 +231,16 @@ func (s *dockerImageSource) GetSignatures() ([][]byte, error) {
}
func (s *dockerImageSource) makeRequest(method, url string, headers map[string]string) (*http.Response, error) {
if s.scheme == "" {
pr, err := s.ping()
if err != nil {
return nil, err
}
s.wwwAuthenticate = pr.WWWAuthenticate
s.scheme = pr.scheme
}
url = fmt.Sprintf(baseURL, s.scheme, s.registry) + url
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
@ -245,7 +249,7 @@ func (s *dockerImageSource) makeRequest(method, url string, headers map[string]s
for n, h := range headers {
req.Header.Add(n, h)
}
if s.WWWAuthenticate != "" {
if s.wwwAuthenticate != "" {
if err := s.setupRequestAuth(req); err != nil {
return nil, err
}
@ -262,9 +266,9 @@ func (s *dockerImageSource) makeRequest(method, url string, headers map[string]s
}
func (s *dockerImageSource) setupRequestAuth(req *http.Request) error {
tokens := strings.SplitN(strings.TrimSpace(s.WWWAuthenticate), " ", 2)
tokens := strings.SplitN(strings.TrimSpace(s.wwwAuthenticate), " ", 2)
if len(tokens) != 2 {
return fmt.Errorf("expected 2 tokens in WWW-Authenticate: %d, %s", len(tokens), s.WWWAuthenticate)
return fmt.Errorf("expected 2 tokens in WWW-Authenticate: %d, %s", len(tokens), s.wwwAuthenticate)
}
switch tokens[0] {
case "Basic":