dotcloud/docker

package client // import "github.com/docker/docker/client"

import (
    "context"
    "encoding/json"
    "net/url"
    "strconv"

    "github.com/docker/docker/api/types"
    "github.com/docker/docker/api/types/filters"
    "github.com/pkg/errors"
)

// BuildCachePrune requests the daemon to delete unused cache data
func (cli *Client) BuildCachePrune(ctx context.Context, opts types.BuildCachePruneOptions) (*types.BuildCachePruneReport, error) {
    if err := cli.NewVersionError(ctx, "1.31", "build prune"); err != nil {
        return nil, err
    }

    report := types.BuildCachePruneReport{}

    query := url.Values{}
    if opts.All {
        query.Set("all", "1")
    }
    query.Set("keep-storage", strconv.Itoa(int(opts.KeepStorage)))
    f, err := filters.ToJSON(opts.Filters)
    if err != nil {
        return nil, errors.Wrap(err, "prune could not marshal filters option")
    }
    query.Set("filters", f)

    serverResp, err := cli.post(ctx, "/build/prune", query, nil, nil)
    defer ensureReaderClosed(serverResp)

    if err != nil {
        return nil, err
    }

    if err := json.NewDecoder(serverResp.body).Decode(&report); err != nil {
        return nil, errors.Wrap(err, "error retrieving disk usage")
    }

    return &report, nil
}