Package updater is an update registry that manages updates and versions.



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var (
	ErrNotFound            = errors.New("the requested file could not be found")
	ErrNotAvailableLocally = errors.New("the requested file is not available locally")



func GetIdentifierAndVersion

func GetIdentifierAndVersion(versionedPath string) (identifier, version string, ok bool)

GetIdentifierAndVersion splits the given file path into its identifier and version.

func GetVersionedPath

func GetVersionedPath(identifier, version string) (versionedPath string)

GetVersionedPath combines the identifier and version and returns it as a file path.

func UnpackGZIP

func UnpackGZIP(r io.Reader) (io.Reader, error)

UnpackGZIP unpacks a GZIP compressed reader r and returns a new reader. It's suitable to be used with registry.GetPackedFile.


type File

type File struct {
	// contains filtered or unexported fields

File represents a file from the update system.

func (*File) Blacklist

func (file *File) Blacklist() error

Blacklist notifies the update system that this file is somehow broken, and should be ignored from now on, until restarted.

func (*File) EqualsVersion

func (file *File) EqualsVersion(version string) bool

EqualsVersion normalizes the given version and checks equality with semver.

func (*File) Identifier

func (file *File) Identifier() string

Identifier returns the identifier of the file.

func (*File) Path

func (file *File) Path() string

Path returns the absolute filepath of the file.

func (*File) SemVer

func (file *File) SemVer() *semver.Version

SemVer returns the semantic version of the file.

func (*File) Unpack

func (file *File) Unpack(suffix string, unpacker Unpacker) (string, error)

Unpack returns the path to the unpacked version of file and unpacks it on demand using unpacker.

func (*File) UpgradeAvailable

func (file *File) UpgradeAvailable() bool

UpgradeAvailable returns whether an upgrade is available for this file.

func (*File) Version

func (file *File) Version() string

Version returns the version of the file.

func (*File) WaitForAvailableUpgrade

func (file *File) WaitForAvailableUpgrade() <-chan struct{}

WaitForAvailableUpgrade blocks (selectable) until an upgrade for this file is available.

type Index

type Index struct {
	// Path is the path to the index file
	// on the update server.
	Path string

	// PreRelease signifies that all versions of this index should be marked as
	// pre-releases, no matter if the versions actually have a pre-release tag or
	// not.
	PreRelease bool

Index describes an index file pulled by the updater.

type Resource

type Resource struct {

	// Identifier is the unique identifier for that resource.
	// It forms a file path using a forward-slash as the
	// path separator.
	Identifier string

	// Versions holds all available resource versions.
	Versions []*ResourceVersion

	// ActiveVersion is the last version of the resource
	// that someone requested using GetFile().
	ActiveVersion *ResourceVersion

	// SelectedVersion is newest, selectable version of
	// that resource that is available. A version
	// is selectable if it's not blacklisted by the user.
	// Note that it's not guaranteed that the selected version
	// is available locally. In that case, GetFile will attempt
	// to download the latest version from the updates servers
	// specified in the resource registry.
	SelectedVersion *ResourceVersion
	// contains filtered or unexported fields

Resource represents a resource (via an identifier) and multiple file versions.

func (*Resource) AddVersion

func (res *Resource) AddVersion(version string, available, currentRelease, preRelease bool) error

AddVersion adds a resource version to a resource.

func (*Resource) AnyVersionAvailable

func (res *Resource) AnyVersionAvailable() bool

AnyVersionAvailable returns true if any version of res is locally available.

func (*Resource) Blacklist

func (res *Resource) Blacklist(version string) error

Blacklist blacklists the specified version and selects a new version.

func (*Resource) GetFile

func (res *Resource) GetFile() *File

GetFile returns the selected version as a *File.

func (*Resource) Len

func (res *Resource) Len() int

Len is the number of elements in the collection. It implements sort.Interface for ResourceVersion.

func (*Resource) Less

func (res *Resource) Less(i, j int) bool

Less reports whether the element with index i should sort before the element with index j. It implements sort.Interface for ResourceVersions.

func (*Resource) Purge

func (res *Resource) Purge(keepExtra int)

Purge deletes old updates, retaining a certain amount, specified by the keep parameter. Purge will always keep at least 2 versions so specifying a smaller keep value will have no effect.

func (*Resource) Swap

func (res *Resource) Swap(i, j int)

Swap swaps the elements with indexes i and j. It implements sort.Interface for ResourceVersions.

func (*Resource) UnpackArchive

func (res *Resource) UnpackArchive() error

UnpackArchive unpacks the archive the resource refers to. The contents are unpacked into a directory with the same name as the file, excluding the suffix. If the destination folder already exists, it is assumed that the contents have already been correctly unpacked.

type ResourceRegistry

type ResourceRegistry struct {

	Name string

	UpdateURLs       []string
	UserAgent        string
	MandatoryUpdates []string
	AutoUnpack       []string

	// UsePreReleases signifies that pre-releases should be used when selecting a
	// version. Even if false, a pre-release version will still be used if it is
	// defined as the current version by an index.
	UsePreReleases bool
	DevMode        bool
	Online         bool
	// contains filtered or unexported fields

ResourceRegistry is a registry for managing update resources.

func (*ResourceRegistry) AddIndex

func (reg *ResourceRegistry) AddIndex(idx Index)

AddIndex adds a new index to the resource registry. The order is important, as indexes added later will override the current release from earlier indexes.

func (*ResourceRegistry) AddResource

func (reg *ResourceRegistry) AddResource(identifier, version string, available, currentRelease, preRelease bool) error

AddResource adds a resource to the registry. Does _not_ select new version.

func (*ResourceRegistry) AddResources

func (reg *ResourceRegistry) AddResources(versions map[string]string, available, currentRelease, preRelease bool) error

AddResources adds resources to the registry. Errors are logged, the last one is returned. Despite errors, non-failing resources are still added. Does _not_ select new versions.

func (*ResourceRegistry) Cleanup

func (reg *ResourceRegistry) Cleanup() error

Cleanup removes temporary files.

func (reg *ResourceRegistry) CreateSymlinks(symlinkRoot *utils.DirStructure) error

CreateSymlinks creates a directory structure with unversioned symlinks to the given updates list.

func (*ResourceRegistry) DownloadUpdates

func (reg *ResourceRegistry) DownloadUpdates(ctx context.Context) error

DownloadUpdates checks if updates are available and downloads updates of used components.

func (*ResourceRegistry) Export

func (reg *ResourceRegistry) Export() map[string]*Resource

Export exports the list of resources. All resources must be locked when accessed.

func (*ResourceRegistry) GetFile

func (reg *ResourceRegistry) GetFile(identifier string) (*File, error)

GetFile returns the selected (mostly newest) file with the given identifier or an error, if it fails.

func (*ResourceRegistry) GetSelectedVersions

func (reg *ResourceRegistry) GetSelectedVersions() (versions map[string]string)

GetSelectedVersions returns a list of the currently selected versions.

func (*ResourceRegistry) Initialize

func (reg *ResourceRegistry) Initialize(storageDir *utils.DirStructure) error

Initialize initializes a raw registry struct and makes it ready for usage.

func (*ResourceRegistry) LoadIndexes

func (reg *ResourceRegistry) LoadIndexes(ctx context.Context) error

LoadIndexes loads the current release indexes from disk or will fetch a new version if not available and the registry is marked as online.

func (*ResourceRegistry) Purge

func (reg *ResourceRegistry) Purge(keep int)

Purge deletes old updates, retaining a certain amount, specified by the keep parameter. Will at least keep 2 updates per resource.

func (*ResourceRegistry) ResetIndexes

func (reg *ResourceRegistry) ResetIndexes()

ResetIndexes removes all indexes from the registry.

func (*ResourceRegistry) ResetResources

func (reg *ResourceRegistry) ResetResources()

ResetResources removes all resources from the registry.

func (*ResourceRegistry) ScanStorage

func (reg *ResourceRegistry) ScanStorage(root string) error

ScanStorage scans root within the storage dir and adds found resources to the registry. If an error occurred, it is logged and the last error is returned. Everything that was found despite errors is added to the registry anyway. Leave root empty to scan the full storage dir.

func (*ResourceRegistry) SelectVersions

func (reg *ResourceRegistry) SelectVersions()

SelectVersions selects new resource versions depending on the current registry state.

func (*ResourceRegistry) SetDevMode

func (reg *ResourceRegistry) SetDevMode(on bool)

SetDevMode sets the development mode flag.

func (*ResourceRegistry) SetUsePreReleases

func (reg *ResourceRegistry) SetUsePreReleases(yes bool)

SetUsePreReleases sets the UsePreReleases flag.

func (*ResourceRegistry) StorageDir

func (reg *ResourceRegistry) StorageDir() *utils.DirStructure

StorageDir returns the main storage dir of the resource registry.

func (*ResourceRegistry) TmpDir

func (reg *ResourceRegistry) TmpDir() *utils.DirStructure

TmpDir returns the temporary working dir of the resource registry.

func (*ResourceRegistry) UnpackResources

func (reg *ResourceRegistry) UnpackResources() error

UnpackResources unpacks all resources defined in the AutoUnpack list.

func (*ResourceRegistry) UpdateIndexes

func (reg *ResourceRegistry) UpdateIndexes(ctx context.Context) error

UpdateIndexes downloads all indexes. An error is only returned when all indexes fail to update.

type ResourceVersion

type ResourceVersion struct {

	// VersionNumber is the string representation of the resource
	// version.
	VersionNumber string

	// Available indicates if this version is available locally.
	Available bool

	// CurrentRelease indicates that this is the current release that should be
	// selected, if possible.
	CurrentRelease bool

	// PreRelease indicates that this version is pre-release.
	PreRelease bool

	// Blacklisted may be set to true if this version should
	// be skipped and not used. This is useful if the version
	// is known to be broken.
	Blacklisted bool
	// contains filtered or unexported fields

ResourceVersion represents a single version of a resource.

func (*ResourceVersion) EqualsVersion

func (rv *ResourceVersion) EqualsVersion(version string) bool

EqualsVersion normalizes the given version and checks equality with semver.

func (*ResourceVersion) SemVer

func (rv *ResourceVersion) SemVer() *semver.Version

SemVer returns the semantiv version of the resource.

func (*ResourceVersion) String

func (rv *ResourceVersion) String() string

type Unpacker

type Unpacker func(io.Reader) (io.Reader, error)

Unpacker describes the function that is passed to File.Unpack. It receives a reader to the compressed/packed file and should return a reader that provides unpacked file contents. If the returned reader implements io.Closer it's close method is invoked when an error or io.EOF is returned from Read().