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docs
This commit is contained in:
Thomas Nagy
parent
445c0214ff
commit
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@ -1,100 +1,75 @@
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== Download and installation
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=== Obtaining the Waf file
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=== Getting the Waf file
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==== Running the Waf binary script
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==== How to download Waf
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A Python programming language interpreter such as http://www.python.org[cPython] 2.5 to 3.5, http://pypy.org[Pypy] or http://www.jython.org[Jython] >= 2.5 is required to run Waf. The file may be renamed as *waf* is necessary:
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The release files may be downloaded from the http://waf.io[main site] or http://freehackers.org/~tnagy/release[from a mirror]
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while the source may be obtained from https://github.com/waf-project/waf[Github].
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The downloads and most project commits are signed with the https://raw.githubusercontent.com/waf-project/waf/master/utils/pubkey.asc[project public key]:
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- The Waf executable contains an embedded signature which can be verified by means of a https://raw.githubusercontent.com/waf-project/waf/master/utils/verify-sig.py[script]:
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[source,shishell]
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---------------
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$ wget https://waf.io/waf-{version}
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$ mv waf-{version} waf
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$ python waf --version
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waf {version} (54dc13ba5f51bfe2ae277451ec5ac1d0a91c7aaf)
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$ ./waf/utils/verify-sig.py waf-{version}
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---------------
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The +waf+ file has its own library compressed as a binary stream in the same file. Upon execution, the library is uncompressed in a hidden folder in the directory of the Waf file. The folder will be re-created if removed. This scheme enables different Waf versions to be executed from the same folders:
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[source,shishell]
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---------------
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$ ls -ld .waf*
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.waf-{version}-2c924e3f453eb715218b9cc852291170
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---------------
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No installation is necessary, but the folder containing the Waf file must be writable. If this is not possible, use the instructions in the next section to set the *WAFDIR* environment variable.
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If http://docs.python.org/library/bz2.html[bzip2] compression support is missing in the python interpreter, please use the instructions in the next sections to build Waf from source.
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==== Building Waf from source
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Building Waf requires a Python interpreter having a version number in the range 2.6-3.5. The source code is then processed to support Python 2.5.
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- The source distribution provides a signature file for its archive:
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[source,shishell]
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---------------
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$ wget https://waf.io/waf-{version}.tar.bz2
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$ tar xjvf waf-{version}.tar.bz2
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$ cd waf-{version}
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Configuring the project
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Setting top to : /home/user/waf
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Setting out to : /home/user/waf/build
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Checking for program 'python' : /usr/bin/python
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Waf: Entering directory `/waf-{version}/build'
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[1/1] Creating waf
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Waf: Leaving directory `/waf-{version}/build'
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'build' finished successfully (0.726s)
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$ wget https://waf.io/waf-{version}.tar.bz2.asc
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$ gpg --verify waf-{version}.tar.bz2.asc
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---------------
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For older Python interpreters, the +waf+ file may be created with gzip compression instead of bzip2:
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- Most project commits are signed with the same public key:
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[source,shishell]
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---------------
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$ python waf-light --zip-type=gz
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$ git clone https://github.com/waf-project/waf.git
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$ cd waf/
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$ git show --show-signature
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commit b73ccba03cd5f34b40a36e1d60b6a082a04cd563
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gpg: Signature made sam. 16 jul. 2016 17:31:19 CEST
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gpg: using RSA key 0x49B4C67C05277AAA
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...
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---------------
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Additional extensions can be added to the waf file and redistributed as part of it. For instance, the source distribution contains several extension in testing phase under the folder 'waflib/extras'. Passing a relative path to the __--tools_ switch will include the corresponding file, while passing an absolute path can refer to any file on the filesystem, and non-python files in particular (they will end up in the local the 'waflib/extras/' folder). Here is a short example:
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==== How to run Waf
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The executable may be run directly through a Python interpreter such as http://www.python.org[cPython] 2.5 to 3.5, http://pypy.org[Pypy] or http://www.jython.org[Jython] >= 2.5.
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It provides its own library compressed as a binary stream within the file. Upon execution, this library is uncompressed into a hidden folder in the directory of the file (it is re-created when removed). This scheme enables different Waf versions to be executed from the same folders and under various Python interpreter versions:
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[source,shishell]
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---------------
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$ python waf-light --tools=swig,msvs
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$ python waf-{version} --help
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$ ls -ld .waf*
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.waf-{version}-2c924e3f453eb715218b9cc852291170
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---------------
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==== Custom initialization
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No installation is necessary, but the Python interpreter must feature a http://docs.python.org/library/bz2.html[bzip2 decompressor]; if this module is missing, then it may be necessary to use the build Waf from source (consult the next sections).
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Extension that provide an initialization may also be used to execute custom functions before the regular execution. Assuming that a file named `aba.py` is present in the current directory:
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Additionally, the folder containing the waf file must be writable; if this is not possible, an alternative is to point the environment variable _WAFDIR_ to the folder containing the directory named https://github.com/waf-project/waf/tree/master/waflib[waflib].
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[source,python]
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---------------
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def foo():
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from waflib.Context import WAFVERSION
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print("This is Waf %s" % WAFVERSION)
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---------------
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Another possibility consists in providing the waf files in a visible folder, which may then be kept under a version control solution such as Git. For instance, the +waf-light+ script does not contain the waf library, but can be used in the same way as waf if the waflib folder is present.
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The following will create a custom waf file that will import and execute the function 'foo' before calling the waf library.
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The following diagram represents the process used to find the +waflib+ directory:
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[source,shishell]
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---------------
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$ python waf-light --make-waf --tools=msvs,$PWD/aba.py
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--prelude=$'\tfrom waflib.extras import aba\n\taba.foo()'
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$ ./waf --help
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This is Waf {version}
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[...]
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---------------
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A return statement may also be added, please consult the contents of waf-light to learn more about it, or consider the examples from the https://github.com/waf-project/waf/tree/master/build_system_kit/[build system kit] that illustrate how to create build systems derived from Waf.
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=== Using the Waf file
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image::waflib{PIC}["Waflib discovery"{backend@docbook:,width=450:},align="center"]
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==== Permissions and aliases
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Since the waf file is a python script, it is usually executed by calling +python+ on it:
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Since the waf file is a Python script, it is usually executed by calling +python+ on it:
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[source,shishell]
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---------------
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$ python waf
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---------------
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On unix-like systems, it is usually much more convenient to set the executable permissions and avoid calling +python+ each time:
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On Unix-like systems, it is usually much more convenient to set the executable permissions and avoid calling +python+ each time:
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[source,shishell]
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---------------
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@ -123,22 +98,99 @@ waf {version} (54dc13ba5f51bfe2ae277451ec5ac1d0a91c7aaf)
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For convenience purposes on Windows systems, a https://github.com/waf-project/waf/tree/master/utils/waf.bat[waf.bat file] is provided to detect the presence of the Python application. It assumes that it is residing in the same folder as the waf file.
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In the next sections of the book, we assume that either an alias or the execution path have been set in a way that +waf+ may be called directly.
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=== Customization and redistribution
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==== Local waflib folders
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==== How to build Waf executables
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Although the waf library is unpacked automatically from the waf binary file, it is sometimes necessary to keep its files in a visible folder, which may even be kept in a source control tool (subversion, git, etc). For example, the +waf-light+ script does not contain the waf library, yet it is used to create the +waf+ script by using the directory +waflib+.
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Building Waf requires a Python interpreter having a version number in the range 2.6-3.5. The source code is then processed to support Python 2.5.
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Another alternative for Waf developers is to point the environment variable _WAFDIR_ to the folder containing the directory named `waflib`.
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[source,shishell]
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---------------
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$ wget https://waf.io/waf-{version}.tar.bz2
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$ tar xjvf waf-{version}.tar.bz2
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$ cd waf-{version}
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$ ./waf-light
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Configuring the project
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Setting top to : /home/user/waf
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Setting out to : /home/user/waf/build
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Checking for program 'python' : /usr/bin/python
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Waf: Entering directory `/waf-{version}/build'
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[1/1] Creating waf
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Waf: Leaving directory `/waf-{version}/build'
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'build' finished successfully (0.726s)
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---------------
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The following diagram represents the process used to find the +waflib+ directory:
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For older Python interpreters, the +waf+ file may be created with gzip compression instead of bzip2:
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image::waflib{PIC}["Waflib discovery"{backend@docbook:,width=450:},align="center"]
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[source,shishell]
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---------------
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$ python waf-light --zip-type=gz
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---------------
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Additional extensions can be added to the waf file and redistributed as part of it. For instance, the source distribution contains several extension in testing phase under the folder 'waflib/extras'. Passing a relative path in the _--tools_ switch will include the corresponding file, while passing an absolute path can refer to any file on the filesystem, and non-python files in particular (they will end up in the local the 'waflib/extras/' folder):
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==== Portability concerns
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[source,shishell]
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---------------
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$ python waf-light --tools=swig,msvs
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---------------
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By default, the recommended Python interpreter is cPython, for which the supported versions are 2.5 to 3.5. For maximum convenience for end-users, a copy of the http://www.jython.org[Jython] interpreter (version >= 2.5) might even be redistributed along with a copy of the Waf executable.
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==== How to provide custom initializers
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WARNING: Unless a _WAFDIR_ is set, the 'waf' script must reside in a writable folder to unpack its cache files.
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Extensions that provide an initialization may also be used to execute custom functions before the regular execution. Assuming that a file named `aba.py` is present in the current directory:
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[source,python]
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---------------
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def foo():
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from waflib.Context import WAFVERSION
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print("This is Waf %s" % WAFVERSION)
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---------------
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The following will create a custom waf file that will import and execute the function 'foo' before calling the waf library.
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[source,shishell]
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---------------
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$ python waf-light --make-waf --tools=msvs,$PWD/aba.py
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--prelude=$'\tfrom waflib.extras import aba\n\taba.foo()'
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$ ./waf --help
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This is Waf {version}
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[...]
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---------------
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A return statement may also be added; please consult the contents of https://github.com/waf-project/waf/blob/master/waf-light#L167[waf-light] to learn more about this, or consider the examples from the https://github.com/waf-project/waf/tree/master/build_system_kit/[build system kit] that illustrate how to create build systems derived from Waf.
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==== License and redistribution
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The files included in the waf file (https://github.com/waf-project/waf/blob/master/waf-light#L167[waf-light] and all the files under https://github.com/waf-project/waf/tree/master/waflib[waflib]) are published under a BSD license which is reproduced below:
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[source,txt]
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---------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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---------------
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Though this license is considered very permissive, a copy of the copyright notice must be included in derivative works.
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In order to lift any doubt, such a copy is added to the waf files by default: just open a waf file with a text editor and read its first lines.
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