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Add docker provider for fetching images
Signed-off-by: Matias Pan <matias.pan26@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| package providers | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/sha256" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/url" | ||
| "strings" | ||
|
|
||
| "github.com/docker/docker/api/types" | ||
| "github.com/moby/moby/client" | ||
| ) | ||
|
|
||
| const ( | ||
| sh = `docker run --rm -i -t -v ${PWD}:/tmp/cmd -w /tmp/cmd %s/%s:%s "$@"` | ||
| ) | ||
|
|
||
| type docker struct { | ||
| client *client.Client | ||
| url *url.URL | ||
| } | ||
|
|
||
| func (d *docker) Fetch() (*File, error) { | ||
| owner, name, version := getImageDesc(d.url.Path) | ||
| out, err := d.client.ImagePull(context.Background(), fmt.Sprintf("docker.io/%s/%s:%s", owner, name, version), types.ImagePullOptions{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer out.Close() | ||
|
|
||
| if _, err := io.Copy(ioutil.Discard, out); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &File{ | ||
| Data: ioutil.NopCloser(strings.NewReader(fmt.Sprintf(sh, owner, name, version))), | ||
| Name: name, | ||
| Version: version, | ||
| Hash: sha256.New(), | ||
| }, nil | ||
| } | ||
|
|
||
| // TODO: implement | ||
| func (d *docker) GetLatestVersion(name string) (string, string, error) { | ||
| return "", "", nil | ||
| } | ||
|
|
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| // getImageDesc gest the image owner, name and version from the path. | ||
| func getImageDesc(path string) (string, string, string) { | ||
| path = strings.TrimPrefix(path, "/") | ||
| path = strings.TrimPrefix(path, "r/") | ||
| var ( | ||
| owner, image, version string | ||
| imageDesc = strings.Split(path, "/") | ||
| ) | ||
| if len(imageDesc) == 1 { | ||
| owner, image = "library", imageDesc[0] | ||
| } else { | ||
| owner, image = imageDesc[0], imageDesc[1] | ||
| } | ||
|
|
||
| version = "latest" | ||
| imageVersion := strings.Split(image, ":") | ||
| if len(imageVersion) > 1 { | ||
| image, version = imageVersion[0], imageVersion[1] | ||
| } | ||
|
|
||
| return owner, image, version | ||
| } | ||
|
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| func newDocker(u *url.URL) (Provider, error) { | ||
| if u.Path == "" || len(strings.Split(strings.TrimPrefix("/r", u.Path), "/")) > 3 { | ||
| return nil, fmt.Errorf("Error parsing registry URL. %s is not a valid image name and version", u.Path) | ||
| } | ||
| client, err := client.NewEnvClient() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &docker{url: u, client: client}, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| package providers | ||
|
|
||
| import "testing" | ||
|
|
||
| func TestGetImageDesc(t *testing.T) { | ||
| cases := []struct { | ||
| name string | ||
| path string | ||
| expectedOwner string | ||
| expectedName string | ||
| expectedVersion string | ||
| }{ | ||
| {"no owner no version", "/alpine", "library", "alpine", "latest"}, | ||
| {"no owner with version", "/alpine:3.0.9", "library", "alpine", "3.0.9"}, | ||
| {"with owner and no version", "/hashicorp/terraform", "hashicorp", "terraform", "latest"}, | ||
| {"with owner with version", "/hashicorp/terraform:light", "hashicorp", "terraform", "light"}, | ||
| } | ||
|
|
||
| for _, test := range cases { | ||
| t.Run(test.name, func(t *testing.T) { | ||
| owner, name, version := getImageDesc(test.path) | ||
| switch { | ||
| case test.expectedOwner != owner: | ||
| t.Errorf("expected owner was %s got %s", test.expectedOwner, owner) | ||
| case test.expectedName != name: | ||
| t.Errorf("expected name was %s got %s", test.expectedName, name) | ||
| case test.expectedVersion != version: | ||
| t.Errorf("expected version was %s got %s", test.expectedVersion, version) | ||
| } | ||
| }) | ||
| } | ||
| } |
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