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cimd.go
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cimd.go
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// Copyright 2016 The rkt Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package distribution
import (
"fmt"
"net/url"
"strconv"
"strings"
)
// cimd (container image distribution) is the struct
// that contains the information about a distribution point.
// A cimd URL is encoded as cimd:DistType:Version:Data.
type cimd struct {
Type Type
Version uint32
Data string
}
// parseCIMD parses the given url and returns a cimd.
func parseCIMD(u *url.URL) (*cimd, error) {
if u.Scheme != Scheme {
return nil, fmt.Errorf("unsupported scheme: %q", u.Scheme)
}
parts := strings.SplitN(u.Opaque, ":", 3)
if len(parts) < 3 {
return nil, fmt.Errorf("malformed distribution uri: %q", u.String())
}
version, err := strconv.ParseUint(strings.TrimPrefix(parts[1], "v="), 10, 32)
if err != nil {
return nil, fmt.Errorf("malformed distribution version: %s", parts[1])
}
return &cimd{
Type: Type(parts[0]),
Version: uint32(version),
Data: parts[2],
}, nil
}
// NewCIMDString creates a new cimd URL string.
func NewCIMDString(typ Type, version uint32, data string) string {
return fmt.Sprintf("%s:%s:v=%d:%s", Scheme, typ, version, data)
}