dh_python3 - Online in the Cloud

PROGRAM:

NAME

dh_python3 - calculates Python dependencies, adds maintainer scripts to byte compile
files, etc.

SYNOPSIS

dh_python3 -p PACKAGE [-V [X.Y][-][A.B]] DIR [-X REGEXPR]

DESCRIPTION

QUICK GUIDE FOR MAINTAINERS
· if necessary, describe supported Python 3 versions via X-Python3-Version field in
debian/control,

· build depends on dh-python

· build-depend on python3 or python3-all or python3-all-dev,

· build module/application using its standard build system, remember to build
extensions for all supported Python 3 versions (loop over py3versions -vr),

· install files to the standard locations, add --install-layout=deb to setup.py's
install command if your package is using distutils,

· add python3 to dh's --with option, or:

· include /usr/share/cdbs/1/class/python-distutils.mk in debian/rules and depend on
cdbs (>= 0.4.90), or:

· call dh_python3 in the binary-* target,

· add ${python3:Depends} to Depends

NOTES
dependencies
dh_python3 tries to translate Python dependencies from the requires.txt file to Debian
dependencies. In many cases, this works without any additional configuration because
dh_python3 comes with a build-in mapping of Python module names to Debian packages that is
periodically regenerated from the Debian archive. By default, the version information in
the Python dependencies is discarded. If you want dh_python3 to generate more strict
dependencies (e.g. to avoid ABI problems), or if the automatic mapping does not work
correctly for your package, you have to provide dh_python3 with additional rules for the
translation of Python module to Debian package dependencies.

For a package python3-foo that depends on a package python3-bar, there are two files that
may provide such rules:

1. If the python3-foo source package ships with a debian/py3dist-overrides file, this file
is used by dh_python3 during the build of python3-foo.

2. If the python3-bar source package ships with a debian/python3-bar.pydist file (and uses
dh_python3), this file will be included in the binary package as
/usr/share/dh-python/dist/cpython3/python3-bar. During the build of python3-foo,
dh_python3 will then find and use the file.

Both files have the same format described in /usr/share/doc/dh-python/README.PyDist. If
all you want is to generate versioned dependencies (and assuming that the python3-bar
package provides the pybar Python module), in most cases it will be sufficient to put the
line pybar python3-bar; PEP386 into either of the above files.

private dirs
/usr/share/foo, /usr/share/games/foo, /usr/lib/foo and /usr/lib/games/foo private
directories are scanned for Python files by default (where foo is binary package name). If
your package is shipping Python files in some other directory, add another dh_python3 call
in debian/rules with directory name as an argument - you can use different set of options
in this call. If you need to change options (f.e. a list of supported Python 3 versions)
for a private directory that is checked by default, invoke dh_python3 with --skip-private
option and add another call with a path to this directory and new options.

debug packages
In binary packages which name ends with -dbg, all files in /usr/lib/python3/dist-packages/
directory that have extensions different than so or h are removed by default. Use
--no-dbg-cleaning option to disable this feature.

pyinstall files
Files listed in debian/pkg.pyinstall file will be installed as public modules (i.e. into
.../dist-packages/ directory) for all requested Python versions.

Syntax: path/to/file [VERSION_RANGE] [NAMESPACE]

debian directory is automatically removed from the path, so you can place your files in
debian/ directory and install them from this location (if you want to install them in
"debian" namespace, set NAMESPACE to debian). If NAMESPACE is set, all listed files will
be installed in .../dist-packages/NAMESPACE/ directory.

Examples:

· foo.py installs .../dist-packages/foo.py for all supported Python versions

· foo/bar.py 3.3- installs .../dist-packages/foo/bar.py for versions >= 3.3

· foo/bar.py spam installs .../dist-packages/spam/bar.py

· debian/*.py spam.egg 3.2 installs .../python3.2/dist-packages/spam/egg/*.py files

pyremove files
If you want to remove some public modules (i.e. files in .../dist-packages/ directory)
installed by build system (from all supported Python versions or only from a subset of
these versions), add them to debian/pkg.pyremove file.

Examples:

· *.pth removes .pth files from .../dist-packages/

· bar/baz.py 3.2 removes .../python3.2/dist-packages/bar/baz.py

overriding supported / default Python versions
If you want to override system's list of supported Python versions or the default one
(f.e. to build a package that includes symlinks for older version of Python or compile .py
files only for given interpreter version), you can do that via DEBPYTHON3_SUPPORTED and/or
DEBPYTHON3_DEFAULT env. variables.

Example: 3.2,3.3 limits the list of supported Python versions to Python 3.2 and Python
3.3.

OPTIONS

--version
show program's version number and exit

-h, --help
show help message and exit

--no-guessing-deps
disable guessing dependencies

--no-dbg-cleaning
do not remove any files from debug packages

--no-ext-rename do not add magic tags nor multiarch tuples to extension file names

--no-shebang-rewrite
do not rewrite shebangs

--skip-private
don't check private directories

-v, --verbose
turn verbose mode on

-i, --indep
act on architecture independent packages

-a, --arch
act on architecture dependent packages

-q, --quiet
be quiet

-p PACKAGE, --package=PACKAGE
act on the package named PACKAGE

-N NO_PACKAGE, --no-package=NO_PACKAGE
do not act on the specified package

-V VRANGE
specify list of supported Python 3 versions. See py3compile(1) for examples

-X REGEXPR, --exclude=REGEXPR
exclude items that match given REGEXPR. You may use this option multiple times to
build up a list of things to exclude.

--compile-all
compile all files from given private directory in postinst/rtupdate not just the
ones provided by the package (i.e. do not pass the --package parameter to
py3compile/py3clean)

--depends=DEPENDS
translate given requirements into Debian dependencies and add them to
${python3:Depends}. Use it for missing items in requires.txt

--recommends=RECOMMENDS
translate given requirements into Debian dependencies and add them to
${python3:Recommends}

--suggests=SUGGESTS
translate given requirements into Debian dependencies and add them to
${python3:Suggests}

--requires=FILENAME
translate requirements from given file(s) into Debian dependencies and add them to
${python3:Depends}

--shebang=COMMAND
use given command as shebang in scripts

--ignore-shebangs
do not translate shebangs into Debian dependencies

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