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65 lines
2 KiB
Go
65 lines
2 KiB
Go
package client
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import (
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"io"
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"net/http"
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"net/url"
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"strings"
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"golang.org/x/net/context"
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"github.com/docker/distribution/reference"
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"github.com/docker/docker/api/types"
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)
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// ImagePull requests the docker host to pull an image from a remote registry.
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// It executes the privileged function if the operation is unauthorized
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// and it tries one more time.
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// It's up to the caller to handle the io.ReadCloser and close it properly.
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//
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// FIXME(vdemeester): there is currently used in a few way in docker/docker
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// - if not in trusted content, ref is used to pass the whole reference, and tag is empty
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// - if in trusted content, ref is used to pass the reference name, and tag for the digest
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func (cli *Client) ImagePull(ctx context.Context, refStr string, options types.ImagePullOptions) (io.ReadCloser, error) {
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ref, err := reference.ParseNormalizedNamed(refStr)
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if err != nil {
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return nil, err
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}
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query := url.Values{}
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query.Set("fromImage", reference.FamiliarName(ref))
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if !options.All {
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query.Set("tag", getAPITagFromNamedRef(ref))
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}
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if options.Platform != "" {
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query.Set("platform", strings.ToLower(options.Platform))
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}
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resp, err := cli.tryImageCreate(ctx, query, options.RegistryAuth)
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if resp.statusCode == http.StatusUnauthorized && options.PrivilegeFunc != nil {
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newAuthHeader, privilegeErr := options.PrivilegeFunc()
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if privilegeErr != nil {
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return nil, privilegeErr
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}
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resp, err = cli.tryImageCreate(ctx, query, newAuthHeader)
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}
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if err != nil {
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return nil, err
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}
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return resp.body, nil
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}
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// getAPITagFromNamedRef returns a tag from the specified reference.
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// This function is necessary as long as the docker "server" api expects
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// digests to be sent as tags and makes a distinction between the name
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// and tag/digest part of a reference.
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func getAPITagFromNamedRef(ref reference.Named) string {
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if digested, ok := ref.(reference.Digested); ok {
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return digested.Digest().String()
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}
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ref = reference.TagNameOnly(ref)
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if tagged, ok := ref.(reference.Tagged); ok {
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return tagged.Tag()
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}
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return ""
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}
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