113 lines
4.2 KiB
ReStructuredText
113 lines
4.2 KiB
ReStructuredText
:mod:`packaging.install` --- Installation tools
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===============================================
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.. module:: packaging.install
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:synopsis: Download and installation building blocks
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Packaging provides a set of tools to deal with downloads and installation of
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distributions. Their role is to download the distribution from indexes, resolve
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the dependencies, and provide a safe way to install distributions. An operation
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that fails will cleanly roll back, not leave half-installed distributions on the
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system. Here's the basic process followed:
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#. Move all distributions that will be removed to a temporary location.
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#. Install all the distributions that will be installed in a temporary location.
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#. If the installation fails, move the saved distributions back to their
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location and delete the installed distributions.
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#. Otherwise, move the installed distributions to the right location and delete
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the temporary locations.
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This is a higher-level module built on :mod:`packaging.database` and
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:mod:`packaging.pypi`.
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Public functions
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----------------
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.. function:: get_infos(requirements, index=None, installed=None, \
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prefer_final=True)
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Return information about what's going to be installed and upgraded.
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*requirements* is a string containing the requirements for this
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project, for example ``'FooBar 1.1'`` or ``'BarBaz (<1.2)'``.
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.. XXX are requirements comma-separated?
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If you want to use another index than the main PyPI, give its URI as *index*
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argument.
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*installed* is a list of already installed distributions used to find
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satisfied dependencies, obsoleted distributions and eventual conflicts.
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By default, alpha, beta and candidate versions are not picked up. Set
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*prefer_final* to false to accept them too.
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The results are returned in a dictionary containing all the information
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needed to perform installation of the requirements with the
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:func:`install_from_infos` function:
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>>> get_install_info("FooBar (<=1.2)")
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{'install': [<FooBar 1.1>], 'remove': [], 'conflict': []}
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.. TODO should return tuple or named tuple, not dict
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.. TODO use "predicate" or "requirement" consistently in version and here
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.. FIXME "info" cannot be plural in English, s/infos/info/
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.. function:: install(project)
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.. function:: install_dists(dists, path, paths=None)
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Safely install all distributions provided in *dists* into *path*. *paths* is
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a list of paths where already-installed distributions will be looked for to
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find satisfied dependencies and conflicts (default: :data:`sys.path`).
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Returns a list of installed dists.
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.. FIXME dists are instances of what?
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.. function:: install_from_infos(install_path=None, install=[], remove=[], \
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conflicts=[], paths=None)
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Safely install and remove given distributions. This function is designed to
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work with the return value of :func:`get_infos`: *install*, *remove* and
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*conflicts* should be list of distributions returned by :func:`get_infos`.
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If *install* is not empty, *install_path* must be given to specify the path
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where the distributions should be installed. *paths* is a list of paths
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where already-installed distributions will be looked for (default:
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:data:`sys.path`).
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This function is a very basic installer; if *conflicts* is not empty, the
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system will be in a conflicting state after the function completes. It is a
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building block for more sophisticated installers with conflict resolution
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systems.
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.. TODO document typical value for install_path
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.. TODO document integration with default schemes, esp. user site-packages
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.. function:: install_local_project(path)
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Install a distribution from a source directory, which must contain either a
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Packaging-compliant :file:`setup.cfg` file or a legacy Distutils
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:file:`setup.py` script (in which case Distutils will be used under the hood
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to perform the installation).
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.. function:: remove(project_name, paths=None, auto_confirm=True)
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Remove one distribution from the system.
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.. FIXME this is the only function using "project" instead of dist/release
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..
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Example usage
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--------------
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Get the scheme of what's gonna be installed if we install "foobar":
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