cpio-fs

filesystem bindings for cpio-stream based on tar-fs

npm install cpio-fs

Usage

cpio-fs allows you to pack directories into cpio archives and extract cpios into directories.

var cpio = require('cpio-fs')
var fs = require('fs')

// packing a directory
cpio.pack('./my-directory').pipe(fs.createWriteStream('my-cpio.cpio'))

// extracting a directory
fs.createReadStream('my-other-cpio.cpio').pipe(cpio.extract('./my-other-directory'))

To ignore various files when packing or extracting add a ignore function to the options. ignore is also an alias for filter.

var pack = cpio.pack('./my-directory', {
  ignore: function(name) {
    return path.extname(name) === '.bin' // ignore .bin files when packing
  }
})

var extract = cpio.extract('./my-other-directory', {
  ignore: function(name) {
    return path.extname(name) === '.bin' // ignore .bin files inside the cpio when extracing
  }
})

You can also specify which entries to pack using the entries option

var pack = cpio.pack('./my-directory', {
  entries: ['file1', 'subdir/file2'] // only the specific entries will be packed
})

If you want to modify the headers when packing/extracting add a map function to the options

var pack = cpio.pack('./my-directory', {
  map: function(header) {
    header.name = 'prefixed/'+header.name
    return header
  }
})

var extract = cpio.extract('./my-directory', {
  map: function(header) {
    header.name = 'another-prefix/'+header.name
    return header
  }
})

Similarly you can use mapStream incase you wanna modify the input/output file streams

var pack = cpio.pack('./my-directory', {
  mapStream: function(fileStream, header) {
    if (path.extname(header.name) === '.js') {
      return fileStream.pipe(someTransform)
    }
    return fileStream;
  }
})

var extract = cpio.extract('./my-directory', {
  mapStream: function(fileStream, header) {
    if (path.extname(header.name) === '.js') {
      return fileStream.pipe(someTransform)
    }
    return fileStream;
  }
})

Set options.fmode and options.dmode to ensure that files/directories extracted have the corresponding modes

var extract = cpio.extract('./my-directory', {
  dmode: 0555, // all dirs and files should be readable
  fmode: 0444
})

It can be useful to use dmode and fmode if you are packing/unpacking cpios between *nix/windows to ensure that all files/directories unpacked are readable.

Set options.strict to false if you want to ignore errors due to unsupported entry types (like device files)

To dereference symlinks (pack the contents of the symlink instead of the link itself) set options.dereference to true.

Copy a directory

Copying a directory with permissions and mtime intact is as simple as

cpio.pack('source-directory').pipe(cpio.extract('dest-directory'))

License

MIT