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  "readme": "# tar-fs\n\nfilesystem bindings for [tar-stream](https://github.com/mafintosh/tar-stream).\n\n```\nnpm install tar-fs\n```\n\n[![build status](https://secure.travis-ci.org/mafintosh/tar-fs.png)](http://travis-ci.org/mafintosh/tar-fs)\n\n## Usage\n\ntar-fs allows you to pack directories into tarballs and extract tarballs into directories.\n\nIt doesn't gunzip for you, so if you want to extract a `.tar.gz` with this you'll need to use something like [gunzip-maybe](https://github.com/mafintosh/gunzip-maybe) in addition to this.\n\n``` js\nvar tar = require('tar-fs')\nvar fs = require('fs')\n\n// packing a directory\ntar.pack('./my-directory').pipe(fs.createWriteStream('my-tarball.tar'))\n\n// extracting a directory\nfs.createReadStream('my-other-tarball.tar').pipe(tar.extract('./my-other-directory'))\n```\n\nTo ignore various files when packing or extracting add a ignore function to the options. `ignore`\nis also an alias for `filter`. Additionally you get `header` if you use ignore while extracting.\nThat way you could also filter by metadata.\n\n``` js\nvar pack = tar.pack('./my-directory', {\n  ignore: function(name) {\n    return path.extname(name) === '.bin' // ignore .bin files when packing\n  }\n})\n\nvar extract = tar.extract('./my-other-directory', {\n  ignore: function(name) {\n    return path.extname(name) === '.bin' // ignore .bin files inside the tarball when extracing\n  }\n})\n\nvar extractFilesDirs = tar.extract('./my-other-other-directory', {\n  ignore: function(_, header) {\n    // pass files & directories, ignore e.g. symlinks\n    return header.type !== 'file' && header.type !== 'directory'\n  }\n})\n```\n\nYou can also specify which entries to pack using the `entries` option\n\n```js\nvar pack = tar.pack('./my-directory', {\n  entries: ['file1', 'subdir/file2'] // only the specific entries will be packed\n})\n```\n\nIf you want to modify the headers when packing/extracting add a map function to the options\n\n``` js\nvar pack = tar.pack('./my-directory', {\n  map: function(header) {\n    header.name = 'prefixed/'+header.name\n    return header\n  }\n})\n\nvar extract = tar.extract('./my-directory', {\n  map: function(header) {\n    header.name = 'another-prefix/'+header.name\n    return header\n  }\n})\n```\n\nSimilarly you can use `mapStream` incase you wanna modify the input/output file streams\n\n``` js\nvar pack = tar.pack('./my-directory', {\n  mapStream: function(fileStream, header) {\n    if (path.extname(header.name) === '.js') {\n      return fileStream.pipe(someTransform)\n    }\n    return fileStream;\n  }\n})\n\nvar extract = tar.extract('./my-directory', {\n  mapStream: function(fileStream, header) {\n    if (path.extname(header.name) === '.js') {\n      return fileStream.pipe(someTransform)\n    }\n    return fileStream;\n  }\n})\n```\n\nSet `options.fmode` and `options.dmode` to ensure that files/directories extracted have the corresponding modes\n\n``` js\nvar extract = tar.extract('./my-directory', {\n  dmode: parseInt(555, 8), // all dirs should be readable\n  fmode: parseInt(444, 8) // all files should be readable\n})\n```\n\nIt can be useful to use `dmode` and `fmode` if you are packing/unpacking tarballs between *nix/windows to ensure that all files/directories unpacked are readable.\n\nAlternatively you can set `options.readable` and/or `options.writable` to set the dmode and fmode to readable/writable.\n\n``` js\nvar extract = tar.extract('./my-directory', {\n  readable: true, // all dirs and files should be readable\n  writable: true, // all dirs and files should be writable\n})\n```\n\nSet `options.strict` to `false` if you want to ignore errors due to unsupported entry types (like device files)\n\nTo dereference symlinks (pack the contents of the symlink instead of the link itself) set `options.dereference` to `true`.\n\n## Copy a directory\n\nCopying a directory with permissions and mtime intact is as simple as\n\n``` js\ntar.pack('source-directory').pipe(tar.extract('dest-directory'))\n```\n\n## Interaction with [`tar-stream`](https://github.com/mafintosh/tar-stream)\n\nUse `finalize: false` and the `finish` hook to\nleave the pack stream open for further entries (see\n[`tar-stream#pack`](https://github.com/mafintosh/tar-stream#packing)),\nand use `pack` to pass an existing pack stream.\n\n``` js\nvar mypack = tar.pack('./my-directory', {\n  finalize: false,\n  finish: function(sameAsMypack) {\n    mypack.entry({name: 'generated-file.txt'}, \"hello\")\n    tar.pack('./other-directory', {\n      pack: sameAsMypack\n    })\n  }\n})\n```\n\n\n## Performance\n\nPacking and extracting a 6.1 GB with 2496 directories and 2398 files yields the following results on my Macbook Air.\n[See the benchmark here](https://gist.github.com/mafintosh/8102201)\n\n* tar-fs: 34.261 ms\n* [node-tar](https://github.com/isaacs/node-tar): 366.123 ms (or 10x slower)\n\n## License\n\nMIT\n",
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