t4.Package
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 packageValueError: 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
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, dest=None, registry=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
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