Class OverlayFS

OverlayFS makes a read-only filesystem writable by storing writes on a second, writable file system. Deletes are persisted via metadata stored on the writable file system.

Hierarchy

LockedFS<UnlockedOverlayFS>
- OverlayFS

Implements

FileSystem

Index

Constructors

constructor

Methods

Constructors

constructor

new OverlayFS(writable: FileSystem, readable: FileSystem): OverlayFS

Overrides LockedFS.constructor
- Defined in backend/OverlayFS.ts:981
Parameters
- writable: FileSystem
  
  The file system to write modified files to.
- readable: FileSystem
  
  The file system that initially populates this file system.
Returns OverlayFS

Methods

appendFile

appendFile(fname: string, data: any, encoding: string, flag: FileFlag, mode: number, cb: BFSOneArgCallback): void

Inherited from LockedFS.appendFile
- Defined in generic/locked_fs.ts:252
Parameters
- fname: string
- data: any
- encoding: string
- flag: FileFlag
- mode: number
- cb: BFSOneArgCallback
Returns void

appendFileSync

appendFileSync(fname: string, data: any, encoding: string, flag: FileFlag, mode: number): void

Inherited from LockedFS.appendFileSync
- Defined in generic/locked_fs.ts:261
Parameters
- fname: string
- data: any
- encoding: string
- flag: FileFlag
- mode: number
Returns void

chmod

chmod(p: string, isLchmod: boolean, mode: number, cb: BFSOneArgCallback): void

Implementation of FileSystem.chmod

Inherited from LockedFS.chmod
- Defined in generic/locked_fs.ts:268
Parameters
- p: string
- isLchmod: boolean
- mode: number
- cb: BFSOneArgCallback
Returns void

chmodSync

chmodSync(p: string, isLchmod: boolean, mode: number): void

Implementation of FileSystem.chmodSync

Inherited from LockedFS.chmodSync
- Defined in generic/locked_fs.ts:277
Parameters
- p: string
- isLchmod: boolean
- mode: number
Returns void

chown

chown(p: string, isLchown: boolean, uid: number, gid: number, cb: BFSOneArgCallback): void

Implementation of FileSystem.chown

Inherited from LockedFS.chown
- Defined in generic/locked_fs.ts:284
Parameters
- p: string
- isLchown: boolean
- uid: number
- gid: number
- cb: BFSOneArgCallback
Returns void

chownSync

chownSync(p: string, isLchown: boolean, uid: number, gid: number): void

Implementation of FileSystem.chownSync

Inherited from LockedFS.chownSync
- Defined in generic/locked_fs.ts:293
Parameters
- p: string
- isLchown: boolean
- uid: number
- gid: number
Returns void

diskSpace

diskSpace(p: string, cb: function): void

Inherited from LockedFS.diskSpace
- Defined in generic/locked_fs.ts:39
Parameters
- p: string
- cb: function
  - - (total: number, free: number): any
    - Parameters
      - total: number
      - free: number
      Returns any
Returns void

exists

exists(p: string, cb: function): void

Inherited from LockedFS.exists
- Defined in generic/locked_fs.ts:172
Parameters
- p: string
- cb: function
  - - (exists: boolean): void
    - Parameters
      - exists: boolean
      Returns void
Returns void

existsSync

existsSync(p: string): boolean

Implementation of FileSystem.existsSync

Inherited from LockedFS.existsSync
- Defined in generic/locked_fs.ts:181
Parameters
- p: string
Returns boolean

getFSUnlocked

getFSUnlocked(): UnlockedOverlayFS

Inherited from LockedFS.getFSUnlocked
- Defined in generic/locked_fs.ts:30
Returns UnlockedOverlayFS

getName

getName(): string

Implementation of FileSystem.getName

Inherited from LockedFS.getName
- Defined in generic/locked_fs.ts:26
Returns string

getOverlayedFileSystems

getOverlayedFileSystems(): object

- Defined in backend/OverlayFS.ts:995
Returns object
- readable: FileSystem
- writable: FileSystem

initialize

initialize(cb: BFSOneArgCallback): void

Overrides LockedFS.initialize
- Defined in backend/OverlayFS.ts:991
Parameters
- cb: BFSOneArgCallback
Returns void

isReadOnly

isReadOnly(): boolean

Implementation of FileSystem.isReadOnly

Inherited from LockedFS.isReadOnly
- Defined in generic/locked_fs.ts:44
Returns boolean

link

link(srcpath: string, dstpath: string, cb: BFSOneArgCallback): void

Implementation of FileSystem.link

Inherited from LockedFS.link
- Defined in generic/locked_fs.ts:316
Parameters
- srcpath: string
- dstpath: string
- cb: BFSOneArgCallback
Returns void

linkSync

linkSync(srcpath: string, dstpath: string): void

Implementation of FileSystem.linkSync

Inherited from LockedFS.linkSync
- Defined in generic/locked_fs.ts:325
Parameters
- srcpath: string
- dstpath: string
Returns void

mkdir

mkdir(p: string, mode: number, cb: BFSOneArgCallback): void

Implementation of FileSystem.mkdir

Inherited from LockedFS.mkdir
- Defined in generic/locked_fs.ts:140
Parameters
- p: string
- mode: number
- cb: BFSOneArgCallback
Returns void

mkdirSync

mkdirSync(p: string, mode: number): void

Implementation of FileSystem.mkdirSync

Inherited from LockedFS.mkdirSync
- Defined in generic/locked_fs.ts:149
Parameters
- p: string
- mode: number
Returns void

open

open(p: string, flag: FileFlag, mode: number, cb: BFSCallback): void

Implementation of FileSystem.open

Inherited from LockedFS.open
- Defined in generic/locked_fs.ts:92
Parameters
- p: string
- flag: FileFlag
- mode: number
- cb: BFSCallback
Returns void

openSync

openSync(p: string, flag: FileFlag, mode: number): File

Implementation of FileSystem.openSync

Inherited from LockedFS.openSync
- Defined in generic/locked_fs.ts:101
Parameters
- p: string
- flag: FileFlag
- mode: number
Returns File

readFile

readFile(fname: string, encoding: string, flag: FileFlag, cb: BFSCallback): void

Inherited from LockedFS.readFile
- Defined in generic/locked_fs.ts:220
Parameters
- fname: string
- encoding: string
- flag: FileFlag
- cb: BFSCallback
Returns void

readFileSync

readFileSync(fname: string, encoding: string, flag: FileFlag): any

Inherited from LockedFS.readFileSync
- Defined in generic/locked_fs.ts:229
Parameters
- fname: string
- encoding: string
- flag: FileFlag
Returns any

readdir

readdir(p: string, cb: BFSCallback): void

Implementation of FileSystem.readdir

Inherited from LockedFS.readdir
- Defined in generic/locked_fs.ts:156
Parameters
- p: string
- cb: BFSCallback
Returns void

readdirSync

readdirSync(p: string): string[]

Implementation of FileSystem.readdirSync

Inherited from LockedFS.readdirSync
- Defined in generic/locked_fs.ts:165
Parameters
- p: string
Returns string[]

readlink

readlink(p: string, cb: BFSCallback): void

Implementation of FileSystem.readlink

Inherited from LockedFS.readlink
- Defined in generic/locked_fs.ts:348
Parameters
- p: string
- cb: BFSCallback
Returns void

readlinkSync

readlinkSync(p: string): string

Implementation of FileSystem.readlinkSync

Inherited from LockedFS.readlinkSync
- Defined in generic/locked_fs.ts:357
Parameters
- p: string
Returns string

realpath

realpath(p: string, cache: object, cb: BFSCallback): void

Inherited from LockedFS.realpath
- Defined in generic/locked_fs.ts:188
Parameters
- p: string
- cache: object
  - [path: string]: string
- cb: BFSCallback
Returns void

realpathSync

realpathSync(p: string, cache: object): string

Inherited from LockedFS.realpathSync
- Defined in generic/locked_fs.ts:197
Parameters
- p: string
- cache: object
  - [path: string]: string
Returns string

rename

rename(oldPath: string, newPath: string, cb: BFSOneArgCallback): void

Implementation of FileSystem.rename

Inherited from LockedFS.rename
- Defined in generic/locked_fs.ts:60
Parameters
- oldPath: string
- newPath: string
- cb: BFSOneArgCallback
Returns void

renameSync

renameSync(oldPath: string, newPath: string): void

Implementation of FileSystem.renameSync

Inherited from LockedFS.renameSync
- Defined in generic/locked_fs.ts:69
Parameters
- oldPath: string
- newPath: string
Returns void

rmdir

rmdir(p: string, cb: BFSOneArgCallback): void

Implementation of FileSystem.rmdir

Inherited from LockedFS.rmdir
- Defined in generic/locked_fs.ts:124
Parameters
- p: string
- cb: BFSOneArgCallback
Returns void

rmdirSync

rmdirSync(p: string): void

Implementation of FileSystem.rmdirSync

Inherited from LockedFS.rmdirSync
- Defined in generic/locked_fs.ts:133
Parameters
- p: string
Returns void

stat

stat(p: string, isLstat: boolean, cb: BFSCallback): void

Inherited from LockedFS.stat
- Defined in generic/locked_fs.ts:76
Parameters
- p: string
- isLstat: boolean
- cb: BFSCallback
Returns void

statSync

statSync(p: string, isLstat: boolean): Stats

Inherited from LockedFS.statSync
- Defined in generic/locked_fs.ts:85
Parameters
- p: string
- isLstat: boolean
Returns Stats

supportsLinks

supportsLinks(): boolean

Implementation of FileSystem.supportsLinks

Inherited from LockedFS.supportsLinks
- Defined in generic/locked_fs.ts:48
Returns boolean

supportsProps

supportsProps(): boolean

Implementation of FileSystem.supportsProps

Inherited from LockedFS.supportsProps
- Defined in generic/locked_fs.ts:52
Returns boolean

supportsSynch

supportsSynch(): boolean

Implementation of FileSystem.supportsSynch

Inherited from LockedFS.supportsSynch
- Defined in generic/locked_fs.ts:56
Returns boolean

symlink

symlink(srcpath: string, dstpath: string, type: string, cb: BFSOneArgCallback): void

Implementation of FileSystem.symlink

Inherited from LockedFS.symlink
- Defined in generic/locked_fs.ts:332
Parameters
- srcpath: string
- dstpath: string
- type: string
- cb: BFSOneArgCallback
Returns void

symlinkSync

symlinkSync(srcpath: string, dstpath: string, type: string): void

Implementation of FileSystem.symlinkSync

Inherited from LockedFS.symlinkSync
- Defined in generic/locked_fs.ts:341
Parameters
- srcpath: string
- dstpath: string
- type: string
Returns void

truncate

truncate(p: string, len: number, cb: BFSOneArgCallback): void

Implementation of FileSystem.truncate

Inherited from LockedFS.truncate
- Defined in generic/locked_fs.ts:204
Parameters
- p: string
- len: number
- cb: BFSOneArgCallback
Returns void

truncateSync

truncateSync(p: string, len: number): void

Implementation of FileSystem.truncateSync

Inherited from LockedFS.truncateSync
- Defined in generic/locked_fs.ts:213
Parameters
- p: string
- len: number
Returns void

unlink

unlink(p: string, cb: BFSOneArgCallback): void

Implementation of FileSystem.unlink

Inherited from LockedFS.unlink
- Defined in generic/locked_fs.ts:108
Parameters
- p: string
- cb: BFSOneArgCallback
Returns void

unlinkSync

unlinkSync(p: string): void

Implementation of FileSystem.unlinkSync

Inherited from LockedFS.unlinkSync
- Defined in generic/locked_fs.ts:117
Parameters
- p: string
Returns void

unwrap

unwrap(): UnlockedOverlayFS

- Defined in backend/OverlayFS.ts:999
Returns UnlockedOverlayFS

utimes

utimes(p: string, atime: Date, mtime: Date, cb: BFSOneArgCallback): void

Implementation of FileSystem.utimes

Inherited from LockedFS.utimes
- Defined in generic/locked_fs.ts:300
Parameters
- p: string
- atime: Date
- mtime: Date
- cb: BFSOneArgCallback
Returns void

utimesSync

utimesSync(p: string, atime: Date, mtime: Date): void

Implementation of FileSystem.utimesSync

Inherited from LockedFS.utimesSync
- Defined in generic/locked_fs.ts:309
Parameters
- p: string
- atime: Date
- mtime: Date
Returns void

writeFile

writeFile(fname: string, data: any, encoding: string, flag: FileFlag, mode: number, cb: BFSOneArgCallback): void

Inherited from LockedFS.writeFile
- Defined in generic/locked_fs.ts:236
Parameters
- fname: string
- data: any
- encoding: string
- flag: FileFlag
- mode: number
- cb: BFSOneArgCallback
Returns void

writeFileSync

writeFileSync(fname: string, data: any, encoding: string, flag: FileFlag, mode: number): void

Inherited from LockedFS.writeFileSync
- Defined in generic/locked_fs.ts:245
Parameters
- fname: string
- data: any
- encoding: string
- flag: FileFlag
- mode: number
Returns void

Static isAvailable

isAvailable(): boolean

- Defined in backend/OverlayFS.ts:979
Returns boolean

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