4. Creating a Source Distribution
*********************************

As shown in section A Simple Example, you use the **sdist** command to
create a source distribution.  In the simplest case,

   python setup.py sdist

(assuming you haven’t specified any **sdist** options in the setup
script or config file), **sdist** creates the archive of the default
format for the current platform.  The default format is a gzip’ed tar
file (".tar.gz") on Unix, and ZIP file on Windows.

You can specify as many formats as you like using the "--formats"
option, for example:

   python setup.py sdist --formats=gztar,zip

to create a gzipped tarball and a zip file.  The available formats
are:

+-------------+---------------------------+-----------+
| Format      | Description               | Notes     |
|=============|===========================|===========|
| "zip"       | zip file (".zip")         | (1),(3)   |
+-------------+---------------------------+-----------+
| "gztar"     | gzip’ed tar file          | (2)       |
|             | (".tar.gz")               |           |
+-------------+---------------------------+-----------+
| "bztar"     | bzip2’ed tar file         |           |
|             | (".tar.bz2")              |           |
+-------------+---------------------------+-----------+
| "xztar"     | xz’ed tar file            |           |
|             | (".tar.xz")               |           |
+-------------+---------------------------+-----------+
| "ztar"      | compressed tar file       | (4)       |
|             | (".tar.Z")                |           |
+-------------+---------------------------+-----------+
| "tar"       | tar file (".tar")         |           |
+-------------+---------------------------+-----------+

Changed in version 3.5: Added support for the "xztar" format.

Notes:

1. default on Windows

2. default on Unix

3. requires either external **zip** utility or "zipfile" module (part
   of the standard Python library since Python 1.6)

4. requires the **compress** program. Notice that this format is now
   pending for deprecation and will be removed in the future versions
   of Python.

When using any "tar" format ("gztar", "bztar", "xztar", "ztar" or
"tar"), under Unix you can specify the "owner" and "group" names that
will be set for each member of the archive.

For example, if you want all files of the archive to be owned by root:

   python setup.py sdist --owner=root --group=root


4.1. Specifying the files to distribute
=======================================

If you don’t supply an explicit list of files (or instructions on how
to generate one), the **sdist** command puts a minimal default set
into the source distribution:

* all Python source files implied by the "py_modules" and "packages"
  options

* all C source files mentioned in the "ext_modules" or "libraries"
  options

* scripts identified by the "scripts" option See Installing Scripts.

* anything that looks like a test script: "test/test*.py" (currently,
  the Distutils don’t do anything with test scripts except include
  them in source distributions, but in the future there will be a
  standard for testing Python module distributions)

* Any of the standard README files ("README", "README.txt", or
  "README.rst"), "setup.py" (or whatever you called your setup
  script), and "setup.cfg".

* all files that matches the "package_data" metadata. See Installing
  Package Data.

* all files that matches the "data_files" metadata. See Installing
  Additional Files.

Sometimes this is enough, but usually you will want to specify
additional files to distribute.  The typical way to do this is to
write a *manifest template*, called "MANIFEST.in" by default.  The
manifest template is just a list of instructions for how to generate
your manifest file, "MANIFEST", which is the exact list of files to
include in your source distribution.  The **sdist** command processes
this template and generates a manifest based on its instructions and
what it finds in the filesystem.

If you prefer to roll your own manifest file, the format is simple:
one filename per line, regular files (or symlinks to them) only.  If
you do supply your own "MANIFEST", you must specify everything: the
default set of files described above does not apply in this case.

Changed in version 3.1: An existing generated "MANIFEST" will be
regenerated without **sdist** comparing its modification time to the
one of "MANIFEST.in" or "setup.py".

Changed in version 3.1.3: "MANIFEST" files start with a comment
indicating they are generated. Files without this comment are not
overwritten or removed.

Changed in version 3.2.2: **sdist** will read a "MANIFEST" file if no
"MANIFEST.in" exists, like it used to do.

Changed in version 3.7: "README.rst" is now included in the list of
distutils standard READMEs.

The manifest template has one command per line, where each command
specifies a set of files to include or exclude from the source
distribution.  For an example, again we turn to the Distutils’ own
manifest template:

   include *.txt
   recursive-include examples *.txt *.py
   prune examples/sample?/build

The meanings should be fairly clear: include all files in the
distribution root matching "*.txt", all files anywhere under the
"examples" directory matching "*.txt" or "*.py", and exclude all
directories matching "examples/sample?/build".  All of this is done
*after* the standard include set, so you can exclude files from the
standard set with explicit instructions in the manifest template.
(Or, you can use the "--no-defaults" option to disable the standard
set entirely.)  There are several other commands available in the
manifest template mini-language; see section Creating a source
distribution: the sdist command.

The order of commands in the manifest template matters: initially, we
have the list of default files as described above, and each command in
the template adds to or removes from that list of files.  Once we have
fully processed the manifest template, we remove files that should not
be included in the source distribution:

* all files in the Distutils “build” tree (default "build/")

* all files in directories named "RCS", "CVS", ".svn", ".hg", ".git",
  ".bzr" or "_darcs"

Now we have our complete list of files, which is written to the
manifest for future reference, and then used to build the source
distribution archive(s).

You can disable the default set of included files with the "--no-
defaults" option, and you can disable the standard exclude set with "
--no-prune".

Following the Distutils’ own manifest template, let’s trace how the
**sdist** command builds the list of files to include in the Distutils
source distribution:

1. include all Python source files in the "distutils" and
   "distutils/command" subdirectories (because packages corresponding
   to those two directories were mentioned in the "packages" option in
   the setup script—see section Writing the Setup Script)

2. include "README.txt", "setup.py", and "setup.cfg" (standard files)

3. include "test/test*.py" (standard files)

4. include "*.txt" in the distribution root (this will find
   "README.txt" a second time, but such redundancies are weeded out
   later)

5. include anything matching "*.txt" or "*.py" in the sub-tree under
   "examples",

6. exclude all files in the sub-trees starting at directories matching
   "examples/sample?/build"—this may exclude files included by the
   previous two steps, so it’s important that the "prune" command in
   the manifest template comes after the "recursive-include" command

7. exclude the entire "build" tree, and any "RCS", "CVS", ".svn",
   ".hg", ".git", ".bzr" and "_darcs" directories

Just like in the setup script, file and directory names in the
manifest template should always be slash-separated; the Distutils will
take care of converting them to the standard representation on your
platform. That way, the manifest template is portable across operating
systems.


4.2. Manifest-related options
=============================

The normal course of operations for the **sdist** command is as
follows:

* if the manifest file ("MANIFEST" by default) exists and the first
  line does not have a comment indicating it is generated from
  "MANIFEST.in", then it is used as is, unaltered

* if the manifest file doesn’t exist or has been previously
  automatically generated, read "MANIFEST.in" and create the manifest

* if neither "MANIFEST" nor "MANIFEST.in" exist, create a manifest
  with just the default file set

* use the list of files now in "MANIFEST" (either just generated or
  read in) to create the source distribution archive(s)

There are a couple of options that modify this behaviour.  First, use
the "--no-defaults" and "--no-prune" to disable the standard “include”
and “exclude” sets.

Second, you might just want to (re)generate the manifest, but not
create a source distribution:

   python setup.py sdist --manifest-only

"-o" is a shortcut for "--manifest-only".
