charm

package
v0.0.0-...-acd7349 Latest Latest
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 Go to latest Published: Jul 11, 2013 License: AGPL-3.0 Imports: 21 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var CacheDir string

CacheDir stores the charm cache directory path.

View Source 
var Store = &CharmStore{"https://store.juju.ubuntu.com"}

Functions

func IsValidName 

func IsValidName(name string) bool

IsValidName returns whether name is a valid charm name.

func IsValidSeries 

func IsValidSeries(series string) bool

IsValidSeries returns whether series is a valid series in charm URLs.

func IsValidUser 

func IsValidUser(user string) bool

IsValidUser returns whether user is a valid username in charm URLs.

func Quote 

func Quote(unsafe string) string

Quote translates a charm url string into one which can be safely used in a file path. ASCII letters, ASCII digits, dot and dash stay the same; other characters are translated to their hex representation surrounded by underscores.

Types

type Bundle 

type Bundle struct {
	Path string // May be empty if Bundle wasn't read from a file
	// contains filtered or unexported fields
}

The Bundle type encapsulates access to data and operations on a charm bundle.

func ReadBundle 

func ReadBundle(path string) (bundle *Bundle, err error)

ReadBundle returns a Bundle for the charm in path.

func ReadBundleBytes 

func ReadBundleBytes(data []byte) (bundle *Bundle, err error)

ReadBundleBytes returns a Bundle read from the given data. Make sure the bundle fits in memory before using this.

func (*Bundle) Config 

func (b *Bundle) Config() *Config

Config returns the Config representing the config.yaml file for the charm bundle.

func (*Bundle) ExpandTo 

func (b *Bundle) ExpandTo(dir string) (err error)

ExpandTo expands the charm bundle into dir, creating it if necessary. If any errors occur during the expansion procedure, the process will continue. Only the last error found is returned.

func (*Bundle) Meta 

func (b *Bundle) Meta() *Meta

Meta returns the Meta representing the metadata.yaml file from bundle.

func (*Bundle) Revision 

func (b *Bundle) Revision() int

Revision returns the revision number for the charm expanded in dir.

func (*Bundle) SetRevision 

func (b *Bundle) SetRevision(revision int)

SetRevision changes the charm revision number. This affects the revision reported by Revision and the revision of the charm directory created by ExpandTo.

type Charm 

type Charm interface {
	Meta() *Meta
	Config() *Config
	Revision() int
}

The Charm interface is implemented by any type that may be handled as a charm.

func Read 

func Read(path string) (Charm, error)

Read reads a Charm from path, which can point to either a charm bundle or a charm directory.

type CharmStore 

type CharmStore struct {
	BaseURL string
}

CharmStore is a Repository that provides access to the public juju charm store.

func (*CharmStore) BranchLocation 

func (s *CharmStore) BranchLocation(curl *URL) string

BranchLocation returns the location for the branch holding the charm at curl.

func (*CharmStore) CharmURL 

func (s *CharmStore) CharmURL(location string) (*URL, error)

CharmURL returns the charm URL for the branch at location.

func (*CharmStore) Event 

func (s *CharmStore) Event(curl *URL, digest string) (*EventResponse, error)

Event returns details for a charm event in the charm store.

If digest is empty, the latest event is returned.

func (*CharmStore) Get 

func (s *CharmStore) Get(curl *URL) (Charm, error)

Get returns the charm referenced by curl. CacheDir must have been set, otherwise Get will panic.

func (*CharmStore) Info 

func (s *CharmStore) Info(curl *URL) (*InfoResponse, error)

Info returns details for a charm in the charm store.

func (*CharmStore) Latest 

func (s *CharmStore) Latest(curl *URL) (int, error)

Latest returns the latest revision of the charm referenced by curl, regardless of the revision set on curl itself.

type Config 

type Config struct {
	Options map[string]Option
}

Config represents the supported configuration options for a charm, as declared in its config.yaml file.

func NewConfig 

func NewConfig() *Config

NewConfig returns a new Config without any options.

func ReadConfig 

func ReadConfig(r io.Reader) (*Config, error)

ReadConfig reads a Config in YAML format.

func (*Config) DefaultSettings 

func (c *Config) DefaultSettings() Settings

DefaultSettings returns settings containing the default value of every option in the config. Default values may be nil.

func (*Config) FilterSettings 

func (c *Config) FilterSettings(settings Settings) Settings

FilterSettings returns the subset of the supplied settings that are valid.

func (*Config) ParseSettingsStrings 

func (c *Config) ParseSettingsStrings(values map[string]string) (Settings, error)

ParseSettingsStrings returns settings derived from the supplied map. Every value in the map must be parseable to the correct type for the option identified by its key. Empty values are interpreted as nil.

func (*Config) ParseSettingsYAML 

func (c *Config) ParseSettingsYAML(yamlData []byte, key string) (Settings, error)

ParseSettingsYAML returns settings derived from the supplied YAML data. The YAML must unmarshal to a map of strings to settings data; the supplied key must be present in the map, and must point to a map in which every value must have, or be a string parseable to, the correct type for the associated config option. Empty strings and nil values are both interpreted as nil.

func (*Config) ValidateSettings 

func (c *Config) ValidateSettings(settings Settings) (Settings, error)

ValidateSettings returns a copy of the supplied settings with a consistent type for each value. It returns an error if the settings contain unknown keys or invalid values.

type Dir 

type Dir struct {
	Path string
	// contains filtered or unexported fields
}

The Dir type encapsulates access to data and operations on a charm directory.

func ReadDir 

func ReadDir(path string) (dir *Dir, err error)

ReadDir returns a Dir representing an expanded charm directory.

func (*Dir) BundleTo 

func (dir *Dir) BundleTo(w io.Writer) (err error)

BundleTo creates a charm file from the charm expanded in dir. By convention a charm bundle should have a ".charm" suffix.

func (*Dir) Config 

func (dir *Dir) Config() *Config

Config returns the Config representing the config.yaml file for the charm expanded in dir.

func (*Dir) Meta 

func (dir *Dir) Meta() *Meta

Meta returns the Meta representing the metadata.yaml file for the charm expanded in dir.

func (*Dir) Revision 

func (dir *Dir) Revision() int

Revision returns the revision number for the charm expanded in dir.

func (*Dir) SetDiskRevision 

func (dir *Dir) SetDiskRevision(revision int) error

SetDiskRevision does the same as SetRevision but also changes the revision file in the charm directory.

func (*Dir) SetRevision 

func (dir *Dir) SetRevision(revision int)

SetRevision changes the charm revision number. This affects the revision reported by Revision and the revision of the charm bundled by BundleTo. The revision file in the charm directory is not modified.

type EventResponse 

type EventResponse struct {
	Kind     string   `json:"kind"`
	Revision int      `json:"revision"` // Zero is valid. Can't omitempty.
	Digest   string   `json:"digest,omitempty"`
	Errors   []string `json:"errors,omitempty"`
	Warnings []string `json:"warnings,omitempty"`
	Time     string   `json:"time,omitempty"`
}

EventResponse is sent by the charm store in response to charm-event requests.

type InfoResponse 

type InfoResponse struct {
	Revision int      `json:"revision"` // Zero is valid. Can't omitempty.
	Sha256   string   `json:"sha256,omitempty"`
	Digest   string   `json:"digest,omitempty"`
	Errors   []string `json:"errors,omitempty"`
	Warnings []string `json:"warnings,omitempty"`
}

InfoResponse is sent by the charm store in response to charm-info requests.

type LocalRepository 

type LocalRepository struct {
	Path string
}

LocalRepository represents a local directory containing subdirectories named after an Ubuntu series, each of which contains charms targeted for that series. For example: 

/path/to/repository/oneiric/mongodb/
/path/to/repository/precise/mongodb.charm
/path/to/repository/precise/wordpress/

func (*LocalRepository) Get 

func (r *LocalRepository) Get(curl *URL) (Charm, error)

Get returns a charm matching curl, if one exists. If curl has a revision of -1, it returns the latest charm that matches curl. If multiple candidates satisfy the foregoing, the first one encountered will be returned.

func (*LocalRepository) Latest 

func (r *LocalRepository) Latest(curl *URL) (int, error)

Latest returns the latest revision of the charm referenced by curl, regardless of the revision set on curl itself.

type Meta 

type Meta struct {
	Name        string
	Summary     string
	Description string
	Subordinate bool
	Provides    map[string]Relation `bson:",omitempty"`
	Requires    map[string]Relation `bson:",omitempty"`
	Peers       map[string]Relation `bson:",omitempty"`
	Format      int                 `bson:",omitempty"`
	OldRevision int                 `bson:",omitempty"` // Obsolete
	Categories  []string            `bson:",omitempty"`
}

Meta represents all the known content that may be defined within a charm's metadata.yaml file.

func ReadMeta 

func ReadMeta(r io.Reader) (meta *Meta, err error)

ReadMeta reads the content of a metadata.yaml file and returns its representation.

func (Meta) Check 

func (meta Meta) Check() error

Check checks that the metadata is well-formed.

func (Meta) Hooks 

func (m Meta) Hooks() map[string]bool

Hooks returns a map of all possible valid hooks, taking relations into account. It's a map to enable fast lookups, and the value is always true.

type NotFoundError 

type NotFoundError struct {
	// contains filtered or unexported fields
}

NotFoundError represents an error indicating that the requested data wasn't found.

func (*NotFoundError) Error 

func (e *NotFoundError) Error() string

type Option 

type Option struct {
	Type        string
	Description string
	Default     interface{}
}

Option represents a single charm config option.

type Relation 

type Relation struct {
	Name      string
	Role      RelationRole
	Interface string
	Optional  bool
	Limit     int
	Scope     RelationScope
}

Relation represents a single relation defined in the charm metadata.yaml file.

type RelationRole 

type RelationRole string

RelationRole defines the role of a relation. 

const (
	RoleProvider RelationRole = "provider"
	RoleRequirer RelationRole = "requirer"
	RolePeer     RelationRole = "peer"
)

type RelationScope 

type RelationScope string

RelationScope describes the scope of a relation. 

const (
	ScopeGlobal    RelationScope = "global"
	ScopeContainer RelationScope = "container"
)

type Repository 

type Repository interface {
	Get(curl *URL) (Charm, error)
	Latest(curl *URL) (int, error)
}

Repository respresents a collection of charms.

func InferRepository 

func InferRepository(curl *URL, localRepoPath string) (repo Repository, err error)

InferRepository returns a charm repository inferred from the provided URL. Local URLs will use the provided path.

type Settings 

type Settings map[string]interface{}

Settings is a group of charm config option names and values. A Settings S is considered valid by the Config C if every key in S is an option in C, and every value either has the correct type or is nil.

type URL 

type URL struct {
	Schema   string // "cs" or "local"
	User     string // "joe"
	Series   string // "oneiric"
	Name     string // "wordpress"
	Revision int    // -1 if unset, N otherwise
}

A charm URL represents charm locations such as: 

cs:~joe/oneiric/wordpress
cs:oneiric/wordpress-42
local:oneiric/wordpress

func InferURL 

func InferURL(src, defaultSeries string) (*URL, error)

InferURL returns a charm URL inferred from src. The provided src may be a valid URL, in which case it is returned as-is, or it may be an alias in one of the following formats: 

name
name-revision
series/name
series/name-revision
schema:name
schema:name-revision
cs:~user/name
cs:~user/name-revision

The defaultSeries paramater is used to define the resulting URL when src does not include that information; similarly, a missing schema is assumed to be 'cs'.

func MustParseURL 

func MustParseURL(url string) *URL

MustParseURL works like ParseURL, but panics in case of errors.

func ParseURL 

func ParseURL(url string) (*URL, error)

ParseURL parses the provided charm URL string into its respective structure.

func (*URL) GetBSON 

func (u *URL) GetBSON() (interface{}, error)

GetBSON turns u into a bson.Getter so it can be saved directly on a MongoDB database with mgo.

func (*URL) MarshalJSON 

func (u *URL) MarshalJSON() ([]byte, error)

func (*URL) Path 

func (u *URL) Path() string

func (*URL) SetBSON 

func (u *URL) SetBSON(raw bson.Raw) error

SetBSON turns u into a bson.Setter so it can be loaded directly from a MongoDB database with mgo.

func (*URL) String 

func (u *URL) String() string

func (*URL) UnmarshalJSON 

func (u *URL) UnmarshalJSON(b []byte) error

func (*URL) WithRevision 

func (url *URL) WithRevision(revision int) *URL

WithRevision returns a URL equivalent to url but with Revision set to revision.

Source Files

View all Source files

Directories

Path Synopsis
hooks provides types and constants that define the hooks known to Juju.
 hooks provides types and constants that define the hooks known to Juju.

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