In-memory representation of a package

manifest

Provides a generator of the dicts that make up the serialied package.

top_hash

Returns the top hash of the package.

Note that physical keys are not hashed because the package has the same semantics regardless of where the bytes come from.

Returns

A string that represents the top hash of the package

Package.__repr__(self, max_lines=20)

String representation of the Package.

Package.install(name, registry=None, top_hash=None, dest=None, dest_registry=None)

Installs a named package to the local registry and downloads its files.

Arguments

• name(str): Name of package to install.

• registry(str): Registry where package is located.

  Defaults to the default remote registry.

• top_hash(str): Hash of package to install. Defaults to latest.

• dest(str): Local path to download files to.

• dest_registry(str): Registry to install package to. Defaults to local registry.

Returns

A new Package that points to files on your local machine.

Package.browse(name=None, registry=None, top_hash=None)

Load a package into memory from a registry without making a local copy of the manifest. Arguments

• name(string): name of package to load

• registry(string): location of registry to load package from

• top_hash(string): top hash of package version to load

Package.__contains__(self, logical_key)

Checks whether the package contains a specified logical_key.

Returns

True or False

Package.__getitem__(self, logical_key)

Filters the package based on prefix, and returns either a new Package or a PackageEntry.

Arguments

• prefix(str): prefix to filter on

Returns

PackageEntry if prefix matches a logical_key exactly otherwise Package

Package.fetch(self, dest='./')

Copy all descendants to dest. Descendants are written under their logical names relative to self.

Arguments

• dest: where to put the files (locally)

Returns

None

Package.keys(self)

Returns logical keys in the package.

Package.walk(self)

Generator that traverses all entries in the package tree and returns tuples of (key, entry), with keys in alphabetical order.

Package.load(readable_file)

Loads a package from a readable file-like object.

Arguments

• readable_file: readable file-like object to deserialize package from

Returns

A new Package object

Raises

file not found json decode error invalid package exception

Package.set_dir(self, lkey, path=None, meta=None)

Adds all files from path to the package.

Recursively enumerates every file in path, and adds them to the package according to their relative location to path.

Arguments

• lkey(string): prefix to add to every logical key,

  use '/' for the root of the package.

• path(string): path to scan for files to add to package.

  If None, lkey will be substituted in as the path.

• meta(dict): user level metadata dict to attach to lkey directory entry.

Returns

self

Raises

When path doesn't exist

Package.get(self, logical_key=None)

Gets object from logical_key and returns its physical path. Equivalent to self[logical_key].get().

Arguments

• logical_key(string): logical key of the object to get

Returns

Physical path as a string.

Raises

• KeyError: when logical_key is not present in the package

• ValueError: if the logical_key points to a Package rather than PackageEntry.

Package.set_meta(self, meta)

Sets user metadata on this Package.

Package.build(self, name=None, registry=None, message=None)

Serializes this package to a registry.

Arguments

• name: optional name for package

• registry: registry to build to

    defaults to local registry

• message: the commit message of the package

Returns

The top hash as a string.

Package.dump(self, writable_file)

Serializes this package to a writable file-like object.

Arguments

• writable_file: file-like object to write serialized package.

Returns

None

Raises

fail to create file fail to finish write

Package.set(self, logical_key, entry=None, meta=None)

Returns self with the object at logical_key set to entry.

Arguments

• logical_key(string): logical key to update

• entry(PackageEntry OR string): new entry to place at logical_key in the package.

  If entry is a string, it is treated as a URL, and an entry is created based on it.

  If entry is None, the logical key string will be substituted as the entry value.

• meta(dict): user level metadata dict to attach to entry

Returns

self

Package.delete(self, logical_key)

Returns the package with logical_key removed.

Returns

self

Raises

• KeyError: when logical_key is not present to be deleted

Package.push(self, name, registry=None, dest=None, message=None)

Copies objects to path, then creates a new package that points to those objects. Copies each object in this package to path according to logical key structure, then adds to the registry a serialized version of this package with physical keys that point to the new copies.

Arguments

• name: name for package in registry

• dest: where to copy the objects in the package

• registry: registry where to create the new package

• message: the commit message for the new package

Returns

A new package that points to the copied objects.

Package.diff(self, other_pkg)

Returns three lists -- added, modified, deleted.

Added: present in other_pkg but not in self. Modified: present in both, but different. Deleted: present in self, but not other_pkg.

Arguments

• other_pkg: Package to diff

Returns

added, modified, deleted (all lists of logical keys)

Package.map(self, f, include_directories=False)

Performs a user-specified operation on each entry in the package.

Arguments

• f: function

  The function to be applied to each package entry.

  It should take two inputs, a logical key and a PackageEntry.

• include_directories: bool

  Whether or not to include directory entries in the map.

Returns: list The list of results generated by the map.

Package.filter(self, f, include_directories=False)

Applies a user-specified operation to each entry in the package, removing results that evaluate to False from the output.

Arguments

• f: function

  The function to be applied to each package entry.

  This function should return a boolean.

• include_directories: bool

  Whether or not to include directory entries in the map.

Returns

A new package with entries that evaluated to False removed