47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
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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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"golang.org/x/net/context"
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"github.com/docker/engine-api/types"
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"github.com/docker/engine-api/types/reference"
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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, ref string, options types.ImagePullOptions) (io.ReadCloser, error) {
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repository, tag, err := reference.Parse(ref)
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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", repository)
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if tag != "" && !options.All {
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query.Set("tag", tag)
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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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