restic

package
v0.8.0 Latest Latest
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 Go to latest Published: Nov 26, 2017 License: BSD-2-Clause Imports: 30 Imported by: 0

Documentation

Overview

Package restic is the top level package for the restic backup program, please see https://github.com/restic/restic for more information.

This package exposes the main objects that are handled in restic.

Index

Constants

View Source 
const (
	DataFile     FileType = "data"
	KeyFile               = "key"
	LockFile              = "lock"
	SnapshotFile          = "snapshot"
	IndexFile             = "index"
	ConfigFile            = "config"
)

These are the different data types a backend can store.

View Source 
const RepoVersion = 1

RepoVersion is the version that is written to the config when a repository is newly created with Init().

Variables

View Source 
var ErrMultipleIDMatches = errors.New("multiple IDs with prefix found")

ErrMultipleIDMatches is returned by Find() when multiple IDs with the given prefix are found.

View Source 
var ErrNoIDPrefixFound = errors.New("no ID found")

ErrNoIDPrefixFound is returned by Find() when no ID for the given prefix could be found.

View Source 
var ErrNoSnapshotFound = errors.New("no snapshot found")

ErrNoSnapshotFound is returned when no snapshot for the given criteria could be found.

Functions

func CiphertextLength 

func CiphertextLength(plaintextSize int) int

CiphertextLength returns the encrypted length of a blob with plaintextSize bytes.

func Find 

func Find(be Lister, t FileType, prefix string) (string, error)

Find loads the list of all files of type t and searches for names which start with prefix. If none is found, nil and ErrNoIDPrefixFound is returned. If more than one is found, nil and ErrMultipleIDMatches is returned.

func FindUsedBlobs 

func FindUsedBlobs(ctx context.Context, repo Repository, treeID ID, blobs BlobSet, seen BlobSet) error

FindUsedBlobs traverses the tree ID and adds all seen blobs (trees and data blobs) to the set blobs. The tree blobs in the `seen` BlobSet will not be visited again.

func Getxattr 

func Getxattr(path, name string) ([]byte, error)

Getxattr retrieves extended attribute data associated with path.

func IsAlreadyLocked 

func IsAlreadyLocked(err error) bool

IsAlreadyLocked returns true iff err is an instance of ErrAlreadyLocked.

func Listxattr 

func Listxattr(path string) ([]string, error)

Listxattr retrieves a list of names of extended attributes associated with the given path in the file system.

func NewBlobBuffer 

func NewBlobBuffer(size int) []byte

NewBlobBuffer returns a buffer that is large enough to hold a blob of size plaintext bytes, including the crypto overhead.

func NewRandReader 

func NewRandReader(rnd *rand.Rand) io.Reader

NewRandReader creates a new Reader from a random source.

func PlaintextLength 

func PlaintextLength(ciphertextSize int) int

PlaintextLength returns the plaintext length of a blob with ciphertextSize bytes.

func PrefixLength 

func PrefixLength(be Lister, t FileType) (int, error)

PrefixLength returns the number of bytes required so that all prefixes of all names of type t are unique.

func ReadAt 

func ReadAt(ctx context.Context, be Backend, h Handle, offset int64, p []byte) (n int, err error)

ReadAt reads from the backend handle h at the given position.

func ReaderAt 

func ReaderAt(be Backend, h Handle) io.ReaderAt

ReaderAt returns an io.ReaderAt for a file in the backend.

func RemoveAllLocks 

func RemoveAllLocks(ctx context.Context, repo Repository) error

RemoveAllLocks removes all locks forcefully.

func RemoveStaleLocks 

func RemoveStaleLocks(ctx context.Context, repo Repository) error

RemoveStaleLocks deletes all locks detected as stale from the repository.

func Setxattr 

func Setxattr(path, name string, data []byte) error

Setxattr associates name and data together as an attribute of path.

func TestSetLockTimeout 

func TestSetLockTimeout(t testing.TB, d time.Duration)

TestSetLockTimeout can be used to reduce the lock wait timeout for tests.

Types

type Backend 

type Backend interface {
	// Location returns a string that describes the type and location of the
	// repository.
	Location() string

	// Test a boolean value whether a File with the name and type exists.
	Test(ctx context.Context, h Handle) (bool, error)

	// Remove removes a File with type t and name.
	Remove(ctx context.Context, h Handle) error

	// Close the backend
	Close() error

	// Save stores the data in the backend under the given handle.
	Save(ctx context.Context, h Handle, rd io.Reader) error

	// Load returns a reader that yields the contents of the file at h at the
	// given offset. If length is larger than zero, only a portion of the file
	// is returned. rd must be closed after use. If an error is returned, the
	// ReadCloser must be nil.
	Load(ctx context.Context, h Handle, length int, offset int64) (io.ReadCloser, error)

	// Stat returns information about the File identified by h.
	Stat(ctx context.Context, h Handle) (FileInfo, error)

	// List returns a channel that yields all names of files of type t in an
	// arbitrary order. A goroutine is started for this, which is stopped when
	// ctx is cancelled.
	List(ctx context.Context, t FileType) <-chan string

	// IsNotExist returns true if the error was caused by a non-existing file
	// in the backend.
	IsNotExist(err error) bool

	// Delete removes all data in the backend.
	Delete(ctx context.Context) error
}

Backend is used to store and access data.

type Blob 

type Blob struct {
	Type   BlobType
	Length uint
	ID     ID
	Offset uint
}

Blob is one part of a file or a tree.

func (Blob) String 

func (b Blob) String() string

type BlobHandle 

type BlobHandle struct {
	ID   ID
	Type BlobType
}

BlobHandle identifies a blob of a given type.

func (BlobHandle) String 

func (h BlobHandle) String() string

type BlobHandles 

type BlobHandles []BlobHandle

BlobHandles is an ordered list of BlobHandles that implements sort.Interface.

func (BlobHandles) Len 

func (h BlobHandles) Len() int

func (BlobHandles) Less 

func (h BlobHandles) Less(i, j int) bool

func (BlobHandles) String 

func (h BlobHandles) String() string

func (BlobHandles) Swap 

func (h BlobHandles) Swap(i, j int)

type BlobSet 

type BlobSet map[BlobHandle]struct{}

BlobSet is a set of blobs.

func NewBlobSet 

func NewBlobSet(handles ...BlobHandle) BlobSet

NewBlobSet returns a new BlobSet, populated with ids.

func (BlobSet) Delete 

func (s BlobSet) Delete(h BlobHandle)

Delete removes id from the set.

func (BlobSet) Equals 

func (s BlobSet) Equals(other BlobSet) bool

Equals returns true iff s equals other.

func (BlobSet) Has 

func (s BlobSet) Has(h BlobHandle) bool

Has returns true iff id is contained in the set.

func (BlobSet) Insert 

func (s BlobSet) Insert(h BlobHandle)

Insert adds id to the set.

func (BlobSet) Intersect 

func (s BlobSet) Intersect(other BlobSet) (result BlobSet)

Intersect returns a new set containing the handles that are present in both sets.

func (BlobSet) List 

func (s BlobSet) List() BlobHandles

List returns a sorted slice of all BlobHandle in the set.

func (BlobSet) Merge 

func (s BlobSet) Merge(other BlobSet)

Merge adds the blobs in other to the current set.

func (BlobSet) String 

func (s BlobSet) String() string

func (BlobSet) Sub 

func (s BlobSet) Sub(other BlobSet) (result BlobSet)

Sub returns a new set containing all handles that are present in s but not in other.

type BlobType 

type BlobType uint8

BlobType specifies what a blob stored in a pack is. 

const (
	InvalidBlob BlobType = iota
	DataBlob
	TreeBlob
)

These are the blob types that can be stored in a pack.

func (BlobType) MarshalJSON 

func (t BlobType) MarshalJSON() ([]byte, error)

MarshalJSON encodes the BlobType into JSON.

func (BlobType) String 

func (t BlobType) String() string

func (*BlobType) UnmarshalJSON 

func (t *BlobType) UnmarshalJSON(buf []byte) error

UnmarshalJSON decodes the BlobType from JSON.

type Cache added in v0.8.0 

type Cache interface {
	// BaseDir returns the base directory of the cache.
	BaseDir() string

	// Wrap returns a backend with a cache.
	Wrap(Backend) Backend

	// IsNotExist returns true if the error was caused by a non-existing file.
	IsNotExist(err error) bool

	// Load returns a reader that yields the contents of the file with the
	// given id if it is cached. rd must be closed after use. If an error is
	// returned, the ReadCloser is nil. The files are still encrypted
	Load(h Handle, length int, offset int64) (io.ReadCloser, error)

	// SaveIndex saves an index in the cache.
	Save(Handle, io.Reader) error

	// SaveWriter returns a writer for the to be cached object h. It must be
	// closed after writing is finished.
	SaveWriter(Handle) (io.WriteCloser, error)

	// Remove deletes a single file from the cache. If it isn't cached, this
	// functions must return no error.
	Remove(Handle) error

	// Clear removes all files of type t from the cache that are not contained in the set.
	Clear(FileType, IDSet) error

	// Has returns true if the file is cached.
	Has(Handle) bool
}

Cache manages a local cache.

type Config 

type Config struct {
	Version           uint        `json:"version"`
	ID                string      `json:"id"`
	ChunkerPolynomial chunker.Pol `json:"chunker_polynomial"`
}

Config contains the configuration for a repository.

func CreateConfig 

func CreateConfig() (Config, error)

CreateConfig creates a config file with a randomly selected polynomial and ID.

func LoadConfig 

func LoadConfig(ctx context.Context, r JSONUnpackedLoader) (Config, error)

LoadConfig returns loads, checks and returns the config for a repository.

func TestCreateConfig 

func TestCreateConfig(t testing.TB, pol chunker.Pol) (cfg Config)

TestCreateConfig creates a config for use within tests.

type ErrAlreadyLocked 

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

ErrAlreadyLocked is returned when NewLock or NewExclusiveLock are unable to acquire the desired lock.

func (ErrAlreadyLocked) Error 

func (e ErrAlreadyLocked) Error() string

type ExpirePolicy 

type ExpirePolicy struct {
	Last    int       // keep the last n snapshots
	Hourly  int       // keep the last n hourly snapshots
	Daily   int       // keep the last n daily snapshots
	Weekly  int       // keep the last n weekly snapshots
	Monthly int       // keep the last n monthly snapshots
	Yearly  int       // keep the last n yearly snapshots
	Tags    []TagList // keep all snapshots that include at least one of the tag lists.
}

ExpirePolicy configures which snapshots should be automatically removed.

func (ExpirePolicy) Empty 

func (e ExpirePolicy) Empty() bool

Empty returns true iff no policy has been configured (all values zero).

func (ExpirePolicy) Sum 

func (e ExpirePolicy) Sum() int

Sum returns the maximum number of snapshots to be kept according to this policy.

type ExtendedAttribute 

type ExtendedAttribute struct {
	Name  string `json:"name"`
	Value []byte `json:"value"`
}

ExtendedAttribute is a tuple storing the xattr name and value.

type FileInfo 

type FileInfo struct{ Size int64 }

FileInfo is returned by Stat() and contains information about a file in the backend.

type FileType 

type FileType string

FileType is the type of a file in the backend.

type Handle 

type Handle struct {
	Type FileType
	Name string
}

Handle is used to store and access data in a backend.

func (Handle) String 

func (h Handle) String() string

func (Handle) Valid 

func (h Handle) Valid() error

Valid returns an error if h is not valid.

type HardlinkIndex 

type HardlinkIndex struct {
	Index map[HardlinkKey]string
	// contains filtered or unexported fields
}

HardlinkIndex contains a list of inodes, devices these inodes are one, and associated file names.

func NewHardlinkIndex 

func NewHardlinkIndex() *HardlinkIndex

NewHardlinkIndex create a new index for hard links

func (*HardlinkIndex) Add 

func (idx *HardlinkIndex) Add(inode uint64, device uint64, name string)

Add adds a link to the index.

func (*HardlinkIndex) GetFilename 

func (idx *HardlinkIndex) GetFilename(inode uint64, device uint64) string

GetFilename obtains the filename from the index.

func (*HardlinkIndex) Has 

func (idx *HardlinkIndex) Has(inode uint64, device uint64) bool

Has checks wether the link already exist in the index.

func (*HardlinkIndex) Remove 

func (idx *HardlinkIndex) Remove(inode uint64, device uint64)

Remove removes a link from the index.

type HardlinkKey 

type HardlinkKey struct {
	Inode, Device uint64
}

HardlinkKey is a composed key for finding inodes on a specific device.

type ID 

type ID [idSize]byte

ID references content within a repository.

func FindLatestSnapshot 

func FindLatestSnapshot(ctx context.Context, repo Repository, targets []string, tagLists []TagList, hostname string) (ID, error)

FindLatestSnapshot finds latest snapshot with optional target/directory, tags and hostname filters.

func FindSnapshot 

func FindSnapshot(repo Repository, s string) (ID, error)

FindSnapshot takes a string and tries to find a snapshot whose ID matches the string as closely as possible.

func Hash 

func Hash(data []byte) ID

Hash returns the ID for data.

func IDFromHash 

func IDFromHash(hash []byte) (id ID)

IDFromHash returns the ID for the hash.

func NewRandomID 

func NewRandomID() ID

NewRandomID returns a randomly generated ID. When reading from rand fails, the function panics.

func ParseID 

func ParseID(s string) (ID, error)

ParseID converts the given string to an ID.

func TestParseID 

func TestParseID(s string) ID

TestParseID parses s as a ID and panics if that fails.

func (ID) Equal 

func (id ID) Equal(other ID) bool

Equal compares an ID to another other.

func (ID) EqualString 

func (id ID) EqualString(other string) (bool, error)

EqualString compares this ID to another one, given as a string.

func (ID) IsNull 

func (id ID) IsNull() bool

IsNull returns true iff id only consists of null bytes.

func (ID) MarshalJSON 

func (id ID) MarshalJSON() ([]byte, error)

MarshalJSON returns the JSON encoding of id.

func (*ID) Str 

func (id *ID) Str() string

Str returns the shortened string version of id.

func (ID) String 

func (id ID) String() string

func (*ID) UnmarshalJSON 

func (id *ID) UnmarshalJSON(b []byte) error

UnmarshalJSON parses the JSON-encoded data and stores the result in id.

type IDSet 

type IDSet map[ID]struct{}

IDSet is a set of IDs.

func NewIDSet 

func NewIDSet(ids ...ID) IDSet

NewIDSet returns a new IDSet, populated with ids.

func (IDSet) Delete 

func (s IDSet) Delete(id ID)

Delete removes id from the set.

func (IDSet) Equals 

func (s IDSet) Equals(other IDSet) bool

Equals returns true iff s equals other.

func (IDSet) Has 

func (s IDSet) Has(id ID) bool

Has returns true iff id is contained in the set.

func (IDSet) Insert 

func (s IDSet) Insert(id ID)

Insert adds id to the set.

func (IDSet) Intersect 

func (s IDSet) Intersect(other IDSet) (result IDSet)

Intersect returns a new set containing the IDs that are present in both sets.

func (IDSet) List 

func (s IDSet) List() IDs

List returns a slice of all IDs in the set.

func (IDSet) Merge 

func (s IDSet) Merge(other IDSet)

Merge adds the blobs in other to the current set.

func (IDSet) String 

func (s IDSet) String() string

func (IDSet) Sub 

func (s IDSet) Sub(other IDSet) (result IDSet)

Sub returns a new set containing all IDs that are present in s but not in other.

type IDs 

type IDs []ID

IDs is an ordered list of IDs that implements sort.Interface.

func (IDs) Len 

func (ids IDs) Len() int

func (IDs) Less 

func (ids IDs) Less(i, j int) bool

func (IDs) String 

func (ids IDs) String() string

func (IDs) Swap 

func (ids IDs) Swap(i, j int)

func (IDs) Uniq 

func (ids IDs) Uniq() (list IDs)

Uniq returns list without duplicate IDs. The returned list retains the order of the original list so that the order of the first occurrence of each ID stays the same.

type Index 

type Index interface {
	Has(ID, BlobType) bool
	Lookup(ID, BlobType) ([]PackedBlob, error)
	Count(BlobType) uint

	// Each returns a channel that yields all blobs known to the index. When
	// the context is cancelled, the background goroutine terminates. This
	// blocks any modification of the index.
	Each(ctx context.Context) <-chan PackedBlob
}

Index keeps track of the blobs are stored within files.

type JSONUnpackedLoader 

type JSONUnpackedLoader interface {
	LoadJSONUnpacked(context.Context, FileType, ID, interface{}) error
}

JSONUnpackedLoader loads unpacked JSON.

type Lister 

type Lister interface {
	List(context.Context, FileType) <-chan string
}

Lister allows listing files in a backend.

type Lock 

type Lock struct {
	Time      time.Time `json:"time"`
	Exclusive bool      `json:"exclusive"`
	Hostname  string    `json:"hostname"`
	Username  string    `json:"username"`
	PID       int       `json:"pid"`
	UID       uint32    `json:"uid,omitempty"`
	GID       uint32    `json:"gid,omitempty"`
	// contains filtered or unexported fields
}

Lock represents a process locking the repository for an operation.

There are two types of locks: exclusive and non-exclusive. There may be many different non-exclusive locks, but at most one exclusive lock, which can only be acquired while no non-exclusive lock is held.

A lock must be refreshed regularly to not be considered stale, this must be triggered by regularly calling Refresh.

func LoadLock 

func LoadLock(ctx context.Context, repo Repository, id ID) (*Lock, error)

LoadLock loads and unserializes a lock from a repository.

func NewExclusiveLock 

func NewExclusiveLock(ctx context.Context, repo Repository) (*Lock, error)

NewExclusiveLock returns a new, exclusive lock for the repository. If another lock (normal and exclusive) is already held by another process, ErrAlreadyLocked is returned.

func NewLock 

func NewLock(ctx context.Context, repo Repository) (*Lock, error)

NewLock returns a new, non-exclusive lock for the repository. If an exclusive lock is already held by another process, ErrAlreadyLocked is returned.

func (*Lock) Refresh 

func (l *Lock) Refresh(ctx context.Context) error

Refresh refreshes the lock by creating a new file in the backend with a new timestamp. Afterwards the old lock is removed.

func (*Lock) Stale 

func (l *Lock) Stale() bool

Stale returns true if the lock is stale. A lock is stale if the timestamp is older than 30 minutes or if it was created on the current machine and the process isn't alive any more.

func (Lock) String 

func (l Lock) String() string

func (*Lock) Unlock 

func (l *Lock) Unlock() error

Unlock removes the lock from the repository.

type Node 

type Node struct {
	Name               string              `json:"name"`
	Type               string              `json:"type"`
	Mode               os.FileMode         `json:"mode,omitempty"`
	ModTime            time.Time           `json:"mtime,omitempty"`
	AccessTime         time.Time           `json:"atime,omitempty"`
	ChangeTime         time.Time           `json:"ctime,omitempty"`
	UID                uint32              `json:"uid"`
	GID                uint32              `json:"gid"`
	User               string              `json:"user,omitempty"`
	Group              string              `json:"group,omitempty"`
	Inode              uint64              `json:"inode,omitempty"`
	DeviceID           uint64              `json:"device_id,omitempty"` // device id of the file, stat.st_dev
	Size               uint64              `json:"size,omitempty"`
	Links              uint64              `json:"links,omitempty"`
	LinkTarget         string              `json:"linktarget,omitempty"`
	ExtendedAttributes []ExtendedAttribute `json:"extended_attributes,omitempty"`
	Device             uint64              `json:"device,omitempty"` // in case of Type == "dev", stat.st_rdev
	Content            IDs                 `json:"content"`
	Subtree            *ID                 `json:"subtree,omitempty"`

	Error string `json:"error,omitempty"`

	Path string `json:"-"`
}

Node is a file, directory or other item in a backup.

func NodeFromFileInfo 

func NodeFromFileInfo(path string, fi os.FileInfo) (*Node, error)

NodeFromFileInfo returns a new node from the given path and FileInfo. It returns the first error that is encountered, together with a node.

func (*Node) CreateAt 

func (node *Node) CreateAt(ctx context.Context, path string, repo Repository, idx *HardlinkIndex) error

CreateAt creates the node at the given path and restores all the meta data.

func (Node) Equals 

func (node Node) Equals(other Node) bool

func (Node) GetExtendedAttribute 

func (node Node) GetExtendedAttribute(a string) []byte

GetExtendedAttribute gets the extended attribute.

func (*Node) IsNewer 

func (node *Node) IsNewer(path string, fi os.FileInfo) bool

IsNewer returns true of the file has been updated since the last Stat().

func (Node) MarshalJSON 

func (node Node) MarshalJSON() ([]byte, error)

func (Node) RestoreTimestamps 

func (node Node) RestoreTimestamps(path string) error

func (Node) String 

func (node Node) String() string

func (*Node) UnmarshalJSON 

func (node *Node) UnmarshalJSON(data []byte) error

type Nodes added in v0.8.0 

type Nodes []*Node

Nodes is a slice of nodes that can be sorted.

func (Nodes) Len added in v0.8.0 

func (n Nodes) Len() int

func (Nodes) Less added in v0.8.0 

func (n Nodes) Less(i, j int) bool

func (Nodes) Swap added in v0.8.0 

func (n Nodes) Swap(i, j int)

type PackedBlob 

type PackedBlob struct {
	Blob
	PackID ID
}

PackedBlob is a blob stored within a file.

type Progress 

type Progress struct {
	OnStart  func()
	OnUpdate ProgressFunc
	OnDone   ProgressFunc
	// contains filtered or unexported fields
}

Progress reports progress on an operation.

func NewProgress 

func NewProgress() *Progress

NewProgress returns a new progress reporter. When Start() is called, the function OnStart is executed once. Afterwards the function OnUpdate is called when new data arrives or at least every d interval. The function OnDone is called when Done() is called. Both functions are called synchronously and can use shared state.

func (*Progress) Done 

func (p *Progress) Done()

Done closes the progress report.

func (*Progress) Report 

func (p *Progress) Report(s Stat)

Report adds the statistics from s to the current state and tries to report the accumulated statistics via the feedback channel.

func (*Progress) Reset 

func (p *Progress) Reset()

Reset resets all statistic counters to zero.

func (*Progress) Start 

func (p *Progress) Start()

Start resets and runs the progress reporter.

type ProgressFunc 

type ProgressFunc func(s Stat, runtime time.Duration, ticker bool)

ProgressFunc is used to report progress back to the user.

type RandReader 

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

RandReader allows reading from a rand.Rand.

func (*RandReader) Read 

func (rd *RandReader) Read(p []byte) (int, error)

type Repository 

type Repository interface {

	// Backend returns the backend used by the repository
	Backend() Backend

	Key() *crypto.Key

	SetIndex(Index)

	Index() Index
	SaveFullIndex(context.Context) error
	SaveIndex(context.Context) error
	LoadIndex(context.Context) error

	Config() Config

	LookupBlobSize(ID, BlobType) (uint, error)

	List(context.Context, FileType) <-chan ID
	ListPack(context.Context, ID) ([]Blob, int64, error)

	Flush() error

	SaveUnpacked(context.Context, FileType, []byte) (ID, error)
	SaveJSONUnpacked(context.Context, FileType, interface{}) (ID, error)

	LoadJSONUnpacked(context.Context, FileType, ID, interface{}) error
	LoadAndDecrypt(context.Context, FileType, ID) ([]byte, error)

	LoadBlob(context.Context, BlobType, ID, []byte) (int, error)
	SaveBlob(context.Context, BlobType, []byte, ID) (ID, error)

	LoadTree(context.Context, ID) (*Tree, error)
	SaveTree(context.Context, *Tree) (ID, error)
}

Repository stores data in a backend. It provides high-level functions and transparently encrypts/decrypts data.

type Restorer 

type Restorer struct {
	Error        func(dir string, node *Node, err error) error
	SelectFilter func(item string, dstpath string, node *Node) (selectedForRestore bool, childMayBeSelected bool)
	// contains filtered or unexported fields
}

Restorer is used to restore a snapshot to a directory.

func NewRestorer 

func NewRestorer(repo Repository, id ID) (*Restorer, error)

NewRestorer creates a restorer preloaded with the content from the snapshot id.

func (*Restorer) RestoreTo 

func (res *Restorer) RestoreTo(ctx context.Context, dst string) error

RestoreTo creates the directories and files in the snapshot below dst. Before an item is created, res.Filter is called.

func (*Restorer) Snapshot 

func (res *Restorer) Snapshot() *Snapshot

Snapshot returns the snapshot this restorer is configured to use.

type Snapshot 

type Snapshot struct {
	Time     time.Time `json:"time"`
	Parent   *ID       `json:"parent,omitempty"`
	Tree     *ID       `json:"tree"`
	Paths    []string  `json:"paths"`
	Hostname string    `json:"hostname,omitempty"`
	Username string    `json:"username,omitempty"`
	UID      uint32    `json:"uid,omitempty"`
	GID      uint32    `json:"gid,omitempty"`
	Excludes []string  `json:"excludes,omitempty"`
	Tags     []string  `json:"tags,omitempty"`
	Original *ID       `json:"original,omitempty"`
	// contains filtered or unexported fields
}

Snapshot is the state of a resource at one point in time.

func LoadAllSnapshots 

func LoadAllSnapshots(ctx context.Context, repo Repository) (snapshots []*Snapshot, err error)

LoadAllSnapshots returns a list of all snapshots in the repo.

func LoadSnapshot 

func LoadSnapshot(ctx context.Context, repo Repository, id ID) (*Snapshot, error)

LoadSnapshot loads the snapshot with the id and returns it.

func NewSnapshot 

func NewSnapshot(paths []string, tags []string, hostname string, time time.Time) (*Snapshot, error)

NewSnapshot returns an initialized snapshot struct for the current user and time.

func TestCreateSnapshot 

func TestCreateSnapshot(t testing.TB, repo Repository, at time.Time, depth int, duplication float32) *Snapshot

TestCreateSnapshot creates a snapshot filled with fake data. The fake data is generated deterministically from the timestamp `at`, which is also used as the snapshot's timestamp. The tree's depth can be specified with the parameter depth. The parameter duplication is a probability that the same blob will saved again.

func (*Snapshot) AddTags 

func (sn *Snapshot) AddTags(addTags []string) (changed bool)

AddTags adds the given tags to the snapshots tags, preventing duplicates. It returns true if any changes were made.

func (*Snapshot) HasPaths 

func (sn *Snapshot) HasPaths(paths []string) bool

HasPaths returns true if the snapshot has all of the paths.

func (*Snapshot) HasTagList 

func (sn *Snapshot) HasTagList(l []TagList) bool

HasTagList returns true if the snapshot satisfies at least one TagList, so there is a TagList in l for which all tags are included in sn.

func (*Snapshot) HasTags 

func (sn *Snapshot) HasTags(l []string) bool

HasTags returns true if the snapshot has all the tags in l.

func (Snapshot) ID 

func (sn Snapshot) ID() *ID

ID returns the snapshot's ID.

func (*Snapshot) RemoveTags 

func (sn *Snapshot) RemoveTags(removeTags []string) (changed bool)

RemoveTags removes the given tags from the snapshots tags and returns true if any changes were made.

func (Snapshot) String 

func (sn Snapshot) String() string

type Snapshots 

type Snapshots []*Snapshot

Snapshots is a list of snapshots.

func ApplyPolicy 

func ApplyPolicy(list Snapshots, p ExpirePolicy) (keep, remove Snapshots)

ApplyPolicy returns the snapshots from list that are to be kept and removed according to the policy p. list is sorted in the process.

func FindFilteredSnapshots 

func FindFilteredSnapshots(ctx context.Context, repo Repository, host string, tags []TagList, paths []string) Snapshots

FindFilteredSnapshots yields Snapshots filtered from the list of all snapshots.

func (Snapshots) Len 

func (sn Snapshots) Len() int

Len returns the number of snapshots in sn.

func (Snapshots) Less 

func (sn Snapshots) Less(i, j int) bool

Less returns true iff the ith snapshot has been made after the jth.

func (Snapshots) Swap 

func (sn Snapshots) Swap(i, j int)

Swap exchanges the two snapshots.

type Stat 

type Stat struct {
	Files  uint64
	Dirs   uint64
	Bytes  uint64
	Trees  uint64
	Blobs  uint64
	Errors uint64
}

Stat captures newly done parts of the operation.

func (*Stat) Add 

func (s *Stat) Add(other Stat)

Add accumulates other into s.

func (Stat) String 

func (s Stat) String() string

type TagList 

type TagList []string

TagList is a list of tags.

func (*TagList) Set 

func (l *TagList) Set(s string) error

Set updates the TagList's value.

func (TagList) String 

func (l TagList) String() string

func (TagList) Type 

func (TagList) Type() string

Type returns a description of the type.

type TagLists 

type TagLists []TagList

TagLists consists of several TagList.

func (*TagLists) Set 

func (l *TagLists) Set(s string) error

Set updates the TagList's value.

func (TagLists) String 

func (l TagLists) String() string

func (TagLists) Type 

func (TagLists) Type() string

Type returns a description of the type.

type Tree 

type Tree struct {
	Nodes []*Node `json:"nodes"`
}

Tree is an ordered list of nodes.

func NewTree 

func NewTree() *Tree

NewTree creates a new tree object.

func (Tree) Equals 

func (t Tree) Equals(other *Tree) bool

Equals returns true if t and other have exactly the same nodes.

func (*Tree) Insert 

func (t *Tree) Insert(node *Node) error

Insert adds a new node at the correct place in the tree.

func (*Tree) Sort added in v0.8.0 

func (t *Tree) Sort()

Sort sorts the nodes by name.

func (Tree) String 

func (t Tree) String() string

func (Tree) Subtrees 

func (t Tree) Subtrees() (trees IDs)

Subtrees returns a slice of all subtree IDs of the tree.

Source Files

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