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// Copyright 2011, 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package charm
import (
"errors"
"fmt"
"os"
"github.com/juju/loggo"
)
var logger = loggo.GetLogger("juju.charm")
// The Charm interface is implemented by any type that
// may be handled as a charm.
type Charm interface {
Meta() *Meta
Config() *Config
Revision() int
}
// Read reads a Charm from path, which can point to either a charm bundle or a
// charm directory.
func Read(path string) (Charm, error) {
info, err := os.Stat(path)
if err != nil {
return nil, err
}
if info.IsDir() {
return ReadDir(path)
}
return ReadBundle(path)
}
// InferRepository returns a charm repository inferred from the provided charm
// reference. Local references will use the provided path.
func InferRepository(ref Reference, localRepoPath string) (repo Repository, err error) {
switch ref.Schema {
case "cs":
repo = Store
case "local":
if localRepoPath == "" {
return nil, errors.New("path to local repository not specified")
}
repo = &LocalRepository{Path: localRepoPath}
default:
return nil, fmt.Errorf("unknown schema for charm reference %q", ref)
}
return
}
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