reSTify PEP 262 (#367)
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pep-0262.txt
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pep-0262.txt
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@ -5,329 +5,343 @@ Last-Modified: $Date$
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Author: A.M. Kuchling <amk@amk.ca>
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Status: Deferred
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Type: Standards Track
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Content-Type: text/x-rst
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Created: 08-Jul-2001
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Post-History: 27-Mar-2002
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Introduction
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============
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This PEP describes a format for a database of the Python software
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installed on a system.
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This PEP describes a format for a database of the Python software
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installed on a system.
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(In this document, the term "distribution" is used to mean a set
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of code that's developed and distributed together. A "distribution"
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is the same as a Red Hat or Debian package, but the term "package"
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already has a meaning in Python terminology, meaning "a directory
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with an __init__.py file in it.")
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(In this document, the term "distribution" is used to mean a set
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of code that's developed and distributed together. A "distribution"
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is the same as a Red Hat or Debian package, but the term "package"
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already has a meaning in Python terminology, meaning "a directory
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with an ``__init__.py`` file in it.")
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Requirements
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============
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We need a way to figure out what distributions, and what versions of
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those distributions, are installed on a system. We want to provide
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features similar to CPAN, APT, or RPM. Required use cases that
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should be supported are:
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We need a way to figure out what distributions, and what versions of
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those distributions, are installed on a system. We want to provide
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features similar to CPAN, APT, or RPM. Required use cases that
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should be supported are:
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* Is distribution X on a system?
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* What version of distribution X is installed?
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* Where can the new version of distribution X be found? (This can
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be defined as either "a home page where the user can go and
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find a download link", or "a place where a program can find
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the newest version?" Both should probably be supported.)
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* What files did distribution X put on my system?
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* What distribution did the file x/y/z.py come from?
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* Has anyone modified x/y/z.py locally?
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* What other distributions does this software need?
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* What Python modules does this distribution provide?
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* Is distribution X on a system?
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* What version of distribution X is installed?
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* Where can the new version of distribution X be found? (This can
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be defined as either "a home page where the user can go and
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find a download link", or "a place where a program can find
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the newest version?" Both should probably be supported.)
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* What files did distribution X put on my system?
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* What distribution did the file x/y/z.py come from?
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* Has anyone modified x/y/z.py locally?
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* What other distributions does this software need?
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* What Python modules does this distribution provide?
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Database Location
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=================
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The database lives in a bunch of files under
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<prefix>/lib/python<version>/install-db/. This location will be
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called INSTALLDB through the remainder of this PEP.
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The database lives in a bunch of files under
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<prefix>/lib/python<version>/install-db/. This location will be
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called INSTALLDB through the remainder of this PEP.
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The structure of the database is deliberately kept simple; each
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file in this directory or its subdirectories (if any) describes a
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single distribution. Binary packagings of Python software such as
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RPMs can then update Python's database by just installing the
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corresponding file into the INSTALLDB directory.
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The structure of the database is deliberately kept simple; each
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file in this directory or its subdirectories (if any) describes a
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single distribution. Binary packagings of Python software such as
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RPMs can then update Python's database by just installing the
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corresponding file into the INSTALLDB directory.
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The rationale for scanning subdirectories is that we can move to a
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directory-based indexing scheme if the database directory contains
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too many entries. For example, this would let us transparently
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switch from INSTALLDB/Numeric to INSTALLDB/N/Nu/Numeric or some
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similar hashing scheme.
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The rationale for scanning subdirectories is that we can move to a
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directory-based indexing scheme if the database directory contains
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too many entries. For example, this would let us transparently
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switch from INSTALLDB/Numeric to INSTALLDB/N/Nu/Numeric or some
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similar hashing scheme.
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Database Contents
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=================
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Each file in INSTALLDB or its subdirectories describes a single
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distribution, and has the following contents:
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Each file in INSTALLDB or its subdirectories describes a single
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distribution, and has the following contents:
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An initial line listing the sections in this file, separated
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by whitespace. Currently this will always be 'PKG-INFO FILES
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REQUIRES PROVIDES'. This is for future-proofing; if we add a
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new section, for example to list documentation files, then
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we'd add a DOCS section and list it in the contents. Sections
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are always separated by blank lines.
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An initial line listing the sections in this file, separated
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by whitespace. Currently this will always be 'PKG-INFO FILES
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REQUIRES PROVIDES'. This is for future-proofing; if we add a
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new section, for example to list documentation files, then
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we'd add a DOCS section and list it in the contents. Sections
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are always separated by blank lines.
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A distribution that uses the Distutils for installation should
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automatically update the database. Distributions that roll their
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own installation will have to use the database's API to
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manually add or update their own entry. System package managers
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such as RPM or pkgadd can just create the new file in the
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INSTALLDB directory.
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A distribution that uses the Distutils for installation should
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automatically update the database. Distributions that roll their
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own installation will have to use the database's API to
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manually add or update their own entry. System package managers
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such as RPM or pkgadd can just create the new file in the
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INSTALLDB directory.
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Each section of the file is used for a different purpose.
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Each section of the file is used for a different purpose.
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PKG-INFO section
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PKG-INFO section
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----------------
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An initial set of RFC-822 headers containing the distribution
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information for a file, as described in PEP 241, "Metadata for
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Python Software Packages".
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An initial set of RFC-822 headers containing the distribution
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information for a file, as described in PEP 241, "Metadata for
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Python Software Packages".
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FILES section
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FILES section
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-------------
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An entry for each file installed by the
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distribution. Generated files such as .pyc and .pyo files are
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on this list as well as the original .py files installed by a
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distribution; their checksums won't be stored or checked,
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though.
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An entry for each file installed by the
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distribution. Generated files such as .pyc and .pyo files are
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on this list as well as the original .py files installed by a
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distribution; their checksums won't be stored or checked,
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though.
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Each file's entry is a single tab-delimited line that contains
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the following fields:
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Each file's entry is a single tab-delimited line that contains
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the following fields:
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* The file's full path, as installed on the system.
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* The file's full path, as installed on the system.
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* The file's size
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* The file's size
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* The file's permissions. On Windows, this field will always be
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'unknown'
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* The file's permissions. On Windows, this field will always be
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'unknown'
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* The owner and group of the file, separated by a tab.
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On Windows, these fields will both be 'unknown'.
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* The owner and group of the file, separated by a tab.
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On Windows, these fields will both be 'unknown'.
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* A SHA1 digest of the file, encoded in hex. For generated files
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such as *.pyc files, this field must contain the string "-",
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which indicates that the file's checksum should not be verified.
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* A SHA1 digest of the file, encoded in hex. For generated files
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such as \*.pyc files, this field must contain the string "-",
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which indicates that the file's checksum should not be verified.
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REQUIRES section
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REQUIRES section
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----------------
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This section is a list of strings giving the services required for
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this module distribution to run properly. This list includes the
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distribution name ("python-stdlib") and module names ("rfc822",
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"htmllib", "email", "email.Charset"). It will be specified
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by an extra 'requires' argument to the distutils.core.setup()
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function. For example:
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This section is a list of strings giving the services required for
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this module distribution to run properly. This list includes the
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distribution name ("python-stdlib") and module names ("rfc822",
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"htmllib", "email", "email.Charset"). It will be specified
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by an extra 'requires' argument to the ``distutils.core.setup()``
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function. For example::
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setup(..., requires=['xml.utils.iso8601',
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setup(..., requires=['xml.utils.iso8601',
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Eventually there may be automated tools that look through all of
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the code and produce a list of requirements, but it's unlikely
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that these tools can handle all possible cases; a manual
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way to specify requirements will always be necessary.
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Eventually there may be automated tools that look through all of
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the code and produce a list of requirements, but it's unlikely
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that these tools can handle all possible cases; a manual
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way to specify requirements will always be necessary.
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PROVIDES section
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PROVIDES section
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----------------
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This section is a list of strings giving the services provided by
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an installed distribution. This list includes the distribution name
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("python-stdlib") and module names ("rfc822", "htmllib", "email",
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"email.Charset").
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This section is a list of strings giving the services provided by
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an installed distribution. This list includes the distribution name
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("python-stdlib") and module names ("rfc822", "htmllib", "email",
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"email.Charset").
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XXX should files be listed? e.g. $PREFIX/lib/color-table.txt,
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to pick up data files, required scripts, etc.
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XXX should files be listed? e.g. $PREFIX/lib/color-table.txt,
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to pick up data files, required scripts, etc.
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Eventually there may be an option to let module developers add
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their own strings to this section. For example, you might add
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"XML parser" to this section, and other module distributions could
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then list "XML parser" as one of their dependencies to indicate
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that multiple different XML parsers can be used. For now this
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ability isn't supported because it raises too many issues: do we
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need a central registry of legal strings, or just let people put
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whatever they like? Etc., etc...
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Eventually there may be an option to let module developers add
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their own strings to this section. For example, you might add
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"XML parser" to this section, and other module distributions could
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then list "XML parser" as one of their dependencies to indicate
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that multiple different XML parsers can be used. For now this
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ability isn't supported because it raises too many issues: do we
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need a central registry of legal strings, or just let people put
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whatever they like? Etc., etc...
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API Description
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===============
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There's a single fundamental class, InstallationDatabase. The
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code for it lives in distutils/install_db.py. (XXX any
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suggestions for alternate locations in the standard library, or an
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alternate module name?)
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There's a single fundamental class, InstallationDatabase. The
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code for it lives in distutils/install_db.py. (XXX any
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suggestions for alternate locations in the standard library, or an
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alternate module name?)
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The InstallationDatabase returns instances of Distribution that contain
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all the information about an installed distribution.
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The InstallationDatabase returns instances of Distribution that contain
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all the information about an installed distribution.
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XXX Several of the fields in Distribution are duplicates of ones in
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distutils.dist.Distribution. Probably they should be factored out
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into the Distribution class proposed here, but can this be done in a
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backward-compatible way?
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XXX Several of the fields in Distribution are duplicates of ones in
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distutils.dist.Distribution. Probably they should be factored out
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into the Distribution class proposed here, but can this be done in a
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backward-compatible way?
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InstallationDatabase has the following interface:
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InstallationDatabase has the following interface::
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class InstallationDatabase:
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def __init__ (self, path=None):
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"""InstallationDatabase(path:string)
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Read the installation database rooted at the specified path.
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If path is None, INSTALLDB is used as the default.
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class InstallationDatabase:
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def __init__ (self, path=None):
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"""InstallationDatabase(path:string)
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Read the installation database rooted at the specified path.
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If path is None, INSTALLDB is used as the default.
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"""
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def get_distribution (self, distribution_name):
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"""get_distribution(distribution_name:string) : Distribution
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Get the object corresponding to a single distribution.
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"""
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def list_distributions (self):
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"""list_distributions() : [Distribution]
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Return a list of all distributions installed on the system,
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enumerated in no particular order.
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"""
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def find_distribution (self, path):
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"""find_file(path:string) : Distribution
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Search and return the distribution containing the file 'path'.
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Returns None if the file doesn't belong to any distribution
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that the InstallationDatabase knows about.
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XXX should this work for directories?
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"""
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class Distribution:
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"""Instance attributes:
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name : string
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Distribution name
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files : {string : (size:int, perms:int, owner:string, group:string,
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digest:string)}
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Dictionary mapping the path of a file installed by this distribution
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to information about the file.
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The following fields all come from PEP 241.
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version : distutils.version.Version
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Version of this distribution
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platform : [string]
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summary : string
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description : string
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keywords : string
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home_page : string
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author : string
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author_email : string
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license : string
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"""
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def get_distribution (self, distribution_name):
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"""get_distribution(distribution_name:string) : Distribution
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Get the object corresponding to a single distribution.
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"""
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def list_distributions (self):
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"""list_distributions() : [Distribution]
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Return a list of all distributions installed on the system,
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enumerated in no particular order.
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"""
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def find_distribution (self, path):
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"""find_file(path:string) : Distribution
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Search and return the distribution containing the file 'path'.
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Returns None if the file doesn't belong to any distribution
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that the InstallationDatabase knows about.
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XXX should this work for directories?
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"""
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class Distribution:
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"""Instance attributes:
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name : string
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Distribution name
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files : {string : (size:int, perms:int, owner:string, group:string,
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digest:string)}
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Dictionary mapping the path of a file installed by this distribution
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to information about the file.
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The following fields all come from PEP 241.
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version : distutils.version.Version
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Version of this distribution
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platform : [string]
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summary : string
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description : string
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keywords : string
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home_page : string
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author : string
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author_email : string
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license : string
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"""
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def add_file (self, path):
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"""add_file(path:string):None
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Record the size, ownership, &c., information for an installed file.
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XXX as written, this would stat() the file. Should the size/perms/
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checksum all be provided as parameters to this method instead?
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"""
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def has_file (self, path):
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"""has_file(path:string) : Boolean
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Returns true if the specified path belongs to a file in this
|
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distribution.
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"""
|
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|
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def check_file (self, path):
|
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"""check_file(path:string) : Boolean
|
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Checks whether the file's size, checksum, and ownership match,
|
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returning true if they do.
|
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"""
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def add_file (self, path):
|
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"""add_file(path:string):None
|
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Record the size, ownership, &c., information for an installed file.
|
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XXX as written, this would stat() the file. Should the size/perms/
|
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checksum all be provided as parameters to this method instead?
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"""
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def has_file (self, path):
|
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"""has_file(path:string) : Boolean
|
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Returns true if the specified path belongs to a file in this
|
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distribution.
|
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"""
|
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|
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def check_file (self, path):
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"""check_file(path:string) : Boolean
|
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Checks whether the file's size, checksum, and ownership match,
|
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returning true if they do.
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"""
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Deliverables
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============
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A description of the database API, to be added to this PEP.
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A description of the database API, to be added to this PEP.
|
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|
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Patches to the Distutils that 1) implement an InstallationDatabase
|
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class, 2) Update the database when a new distribution is installed. 3)
|
||||
add a simple package management tool, features to be added to this
|
||||
PEP. (Or should that be a separate PEP?) See [2] for the current
|
||||
patch.
|
||||
Patches to the Distutils that 1) implement an InstallationDatabase
|
||||
class, 2) Update the database when a new distribution is installed. 3)
|
||||
add a simple package management tool, features to be added to this
|
||||
PEP. (Or should that be a separate PEP?) See [2]_ for the current
|
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patch.
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Open Issues
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===========
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PJE suggests the installation database "be potentially present on
|
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every directory in sys.path, with the contents merged in sys.path
|
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order. This would allow home-directory or other
|
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alternate-location installs to work, and ease the process of a
|
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distutils install command writing the file." Nice feature: it does
|
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mean that package manager tools can take into account Python
|
||||
packages that a user has privately installed.
|
||||
PJE suggests the installation database "be potentially present on
|
||||
every directory in sys.path, with the contents merged in sys.path
|
||||
order. This would allow home-directory or other
|
||||
alternate-location installs to work, and ease the process of a
|
||||
distutils install command writing the file." Nice feature: it does
|
||||
mean that package manager tools can take into account Python
|
||||
packages that a user has privately installed.
|
||||
|
||||
AMK wonders: what does setup.py do if it's told to install
|
||||
packages to a directory not on sys.path? Does it write an
|
||||
install-db directory to the directory it's told to write to, or
|
||||
does it do nothing?
|
||||
AMK wonders: what does setup.py do if it's told to install
|
||||
packages to a directory not on sys.path? Does it write an
|
||||
install-db directory to the directory it's told to write to, or
|
||||
does it do nothing?
|
||||
|
||||
Should the package-database file itself be included in the files
|
||||
list? (PJE would think yes, but of course it can't contain its
|
||||
own checksum. AMK can't think of a use case where including the
|
||||
DB file matters.)
|
||||
Should the package-database file itself be included in the files
|
||||
list? (PJE would think yes, but of course it can't contain its
|
||||
own checksum. AMK can't think of a use case where including the
|
||||
DB file matters.)
|
||||
|
||||
PJE wonders about writing the package DB file
|
||||
*first*, before installing any other files, so that failed partial
|
||||
installations can both be backed out, and recognized as broken.
|
||||
This PEP may have to specify some algorithm for recognizing this
|
||||
situation.
|
||||
PJE wonders about writing the package DB file
|
||||
**first**, before installing any other files, so that failed partial
|
||||
installations can both be backed out, and recognized as broken.
|
||||
This PEP may have to specify some algorithm for recognizing this
|
||||
situation.
|
||||
|
||||
Should we guarantee the format of installation databases remains
|
||||
compatible across Python versions, or is it subject to arbitrary
|
||||
change? Probably we need to guarantee compatibility.
|
||||
Should we guarantee the format of installation databases remains
|
||||
compatible across Python versions, or is it subject to arbitrary
|
||||
change? Probably we need to guarantee compatibility.
|
||||
|
||||
|
||||
Rejected Suggestions
|
||||
====================
|
||||
|
||||
Instead of using one text file per distribution, one large text
|
||||
file or an anydbm file could be used. This has been rejected for
|
||||
a few reasons. First, performance is probably not an extremely
|
||||
pressing concern as the database is only used when installing or
|
||||
removing software, a relatively infrequent task. Scalability also
|
||||
likely isn't a problem, as people may have hundreds of Python
|
||||
packages installed, but thousands or tens of thousands seems
|
||||
unlikely. Finally, individual text files are compatible with
|
||||
installers such as RPM or DPKG because a binary packager can just
|
||||
drop the new database file into the database directory. If one
|
||||
large text file or a binary file were used, the Python database
|
||||
would then have to be updated by running a postinstall script.
|
||||
Instead of using one text file per distribution, one large text
|
||||
file or an anydbm file could be used. This has been rejected for
|
||||
a few reasons. First, performance is probably not an extremely
|
||||
pressing concern as the database is only used when installing or
|
||||
removing software, a relatively infrequent task. Scalability also
|
||||
likely isn't a problem, as people may have hundreds of Python
|
||||
packages installed, but thousands or tens of thousands seems
|
||||
unlikely. Finally, individual text files are compatible with
|
||||
installers such as RPM or DPKG because a binary packager can just
|
||||
drop the new database file into the database directory. If one
|
||||
large text file or a binary file were used, the Python database
|
||||
would then have to be updated by running a postinstall script.
|
||||
|
||||
On Windows, the permissions and owner/group of a file aren't
|
||||
stored. Windows does in fact support ownership and access
|
||||
permissions, but reading and setting them requires the win32all
|
||||
extensions, and they aren't present in the basic Python installer
|
||||
for Windows.
|
||||
On Windows, the permissions and owner/group of a file aren't
|
||||
stored. Windows does in fact support ownership and access
|
||||
permissions, but reading and setting them requires the win32all
|
||||
extensions, and they aren't present in the basic Python installer
|
||||
for Windows.
|
||||
|
||||
|
||||
References
|
||||
==========
|
||||
|
||||
[1] Michael Muller's patch (posted to the Distutils-SIG around 28
|
||||
Dec 1999) generates a list of installed files.
|
||||
.. [1] Michael Muller's patch (posted to the Distutils-SIG around 28
|
||||
Dec 1999) generates a list of installed files.
|
||||
|
||||
[2] A patch to implement this PEP will be tracked as
|
||||
patch #562100 on SourceForge.
|
||||
http://www.python.org/sf/562100 .
|
||||
Code implementing the installation database is currently in
|
||||
Python CVS in the nondist/sandbox/pep262 directory.
|
||||
.. [2] A patch to implement this PEP will be tracked as
|
||||
patch #562100 on SourceForge.
|
||||
http://www.python.org/sf/562100 .
|
||||
Code implementing the installation database is currently in
|
||||
Python CVS in the nondist/sandbox/pep262 directory.
|
||||
|
||||
|
||||
Acknowledgements
|
||||
================
|
||||
|
||||
Ideas for this PEP originally came from postings by Greg Ward,
|
||||
Fred L. Drake Jr., Thomas Heller, Mats Wichmann, Phillip J. Eby,
|
||||
and others.
|
||||
Ideas for this PEP originally came from postings by Greg Ward,
|
||||
Fred L. Drake Jr., Thomas Heller, Mats Wichmann, Phillip J. Eby,
|
||||
and others.
|
||||
|
||||
Many changes and rewrites to this document were suggested by the
|
||||
readers of the Distutils SIG.
|
||||
Many changes and rewrites to this document were suggested by the
|
||||
readers of the Distutils SIG.
|
||||
|
||||
|
||||
Copyright
|
||||
=========
|
||||
|
||||
This document has been placed in the public domain.
|
||||
This document has been placed in the public domain.
|
||||
|
||||
|
||||
Local Variables:
|
||||
mode: indented-text
|
||||
indent-tabs-mode: nil
|
||||
End:
|
||||
..
|
||||
Local Variables:
|
||||
mode: indented-text
|
||||
indent-tabs-mode: nil
|
||||
End:
|
||||
|
|
Loading…
Reference in New Issue