Mailman 3 June 2000 - Distutils-SIG

Autoconf in Python
by Greg Ward 22 Jun '00

22 Jun '00

Those of you who follow python-checkins closely probably already know this, but for the rest of you I think this will be news: I now have a working demonstration of the long-mythical, frequently procrastinated, "Autoconf-in-Python"! Marc-Andre, you were right -- it wasn't too bad. I think I probably spent more time combing the Autoconf docs for inspiration, and figuring out how to sensibly translate Autoconf's byzantine shell/M4 interface into sensible OO Python, than I did actually coding it. Here's the bird's-eye view of how it works: * module developer defines a custom command, "config_xxx", which inherits from the standard "config" command (distutils.command.- config.config). (I suggest we adopt the convention "config_" + distribution_name -- which, come to think of it, is probably a good convention for *all* extended commands defined in setup scripts.) * this custom "config" command then calls the various methods provided by the standard "config" to probe the system. Currently available: 'try_cpp()', 'search_cpp()', 'try_compile()', 'try_link()', 'try_run()', 'check_header()', and 'check_func()'. (The 'try' methods are fairly low-level and expect you to provide a chunk of custom-crafted C/C++ code; the 'check' methods just take a header name or function name or what-have-you, and Do The Right Thing.) * the custom "config" command uses the result of the system probing to determine preprocessor macros to define/undefine, include directories to search, libraries to link against, library dirs to search, and whatever else might be needed. Currently the standard "config" command provides no support for this, although it probably should. (My thinking is something like this: users can provide manual overrides by editing the "[config]" section of the setup.cfg file; the custom config command -- if any! -- will then either respect the manual overrides or probe the system (or a combination, depending on which manual overrides are present). At the end of the day, there are a bunch of settings -- macros, include dirs, libraries, and library dirs -- sitting in the "config" command object, which are then used by the various "build" commands. (This is not terribly general -- what if you want to build one extension (or library or executable one way), but others differently? -- but it's good enough. If you need to get fancy, go right ahead: this is Python, the only barrier is your own creativity. No fighting with shell quoting rules or M4 bizarritude. Hooray!) A note on portability: yes, this is all heavily geared towards C and C++. No matter what Sun says (lying all the way to the bank, no doubt), I expect an Autoconf-ish facility will be necessary for grokking Java installations to build JPython extensions -- but that ability is a long ways off, definitely post-Distutils 1.0. Also, I had to add a 'preprocess()' method to the CCompiler interface, which is currently only implemented in UnixCCompiler. Thus, the preprocessor-depending "config" methods ('try_cpp()', 'search_cpp()', 'check_header()') will die horribly on Windows and Mac OS. Please take a look at the 'preprocess()' docstring and let me know if it can be implemented portably, or if the interface will have to change. Oh, Unix wizards: currently I just do "cc -E filename.c -o filename.i" to run the preprocessor. Works with GCC, and ISTR that SGI's compiler supports "-E" too. Anyone know how widely spread this convention is? Should I implement some heuristics to figure out whether to use "cc -E" or "/lib/cpp"? What other options are there? I'm gonna check this in now. No time to make a snapshot tonight -- please get the latest CVS code and give this a whirl. The only test case is mxDateTime (examples/mxdatetime_setup.py), and only 'check_func()' (and therefore 'try_link()') have been tested. Next up is to add autoconfiguration to PIL's setup script. Whee! this is fun... I guess I've written my code for the week, now back to wading through all those patches... Greg -- Greg Ward - nerd gward(a)python.net http://starship.python.net/~gward/ Support bacteria -- it's the only culture some people have!

3 3

Installation requirements
by A.M. Kuchling 21 Jun '00

21 Jun '00

[Follow-up to the Distutils SIG, please.] There are a few steps needed to find and install a package: 1) Discovery : which module does what I need? 2) Download : where can I get a copy? 3) Security : is this actually from the package author, and not a Trojan? 4) Installation : how do I set it up? 5) Checking for new versions: I have 1.0 installed; is a newer version available? Distutils focuses on the hardest and most complicated step, #4. For #1, you would need to browse through a list of available packages, browse through a hierarchy like Parnassus, or do keyword searches. #2 is pretty simple, since you just get one or more download URLs corresponding to a given package name, using the same database as in #1. For #3, you'd have to check a signature on the downloaded package, using something external like GnuPG. This means this step has to be skipped if the external tool isn't available. We could implement our own signature scheme with Python code, but that's a bad idea; security is hard, and few people will bother to generate keys that are only useful for this one application of distributing Python modules. (Side note: the sdist and bdist_* commands should have a --sign switch to sign the generated .tgz, .rpm, or whatever file.) For #5, the existing stuff in Tools/versioncheck might be partially applicable, though it requires that every package have a text file somewhere which gives the latest version. You'd want to use the same database for everything, to ensure that people actually use it! To start off with, we'd need some sort of generic API to the above functions, so that different interfaces can be written. A command-line interface would then be easiest. I don't know how network communications should be handled: HTTP to CGI scripts that return sets of RFC-822 headers, maybe? Combined with a DNS alias like modules.python.org, or modules.{us,uk,...}.python.org? Some potential sources of inspiration: Debian: apt Perl: CPAM.pm FreeBSD: ports system RPMfind (rpmfind.net) XEmacs: packages system -- A.M. Kuchling http://starship.python.net/crew/amk/ "Jo, it's a pity escapology wasn't part of your curriculum." "Funny you should say that. Look." <shows untied hand> -- The Doctor and Jo, tied up, in "Terror of the Autons"

2 1

Prerelease: bdist_wininst
by Thomas Heller 21 Jun '00

21 Jun '00

This is a preliminary version of command/bdist_wininst.py. I still have more plans to extend this, but you are invited to test it. Feedback is very much appreciated. How it works: - 'setup.py bdist_wininst' first builds a binary distribution in zip-format and writes metadata into an ini-file. - These two files are appended to an exe-program which is included compressed and base64 encoded in the bdist_wininst module, so you don't have to build it. - The source code and MSVC project file is temporarily available for download at http://www.ion-tof-com/~thomas. - This should work on unix as well as on win32 systems, as long as the binary distribution does not contain c-extension modules, because distutils cannot cross-compile for windows. The resulting executable, when started, displays an installer-like user interface, checks for python installation(s) via the registry, lets the user select a directory for installation, and extracts all files. If the installation directory is different from the python installation directory, a .pth file is written. Future plans: - Improve the appearance of the installer dialog, add an icon, ... - Provide a help button - Provide a rollback capability if the installation failed. - Provide an uninstaller. - More stuff ----- Options (command line flags) for bdist_wininst: --target-compile Set a flag to compile all .py files to .pyc on the target system --target-optimize Set a flag to compile all .py files to .pyo on the target system --target-version=[1.5|1.6] Require python 1.5 or 1.6 on the target system Thomas Appended are: 1. context-diffs to fully integrate bdist_wininst into distutils 2. source code for bdist_wininst.py --------> start patch <-------- Index: command/__init__.py =================================================================== RCS file: /cvsroot/python/distutils/distutils/command/__init__.py,v retrieving revision 1.13 diff -c -r1.13 __init__.py *** command/__init__.py 2000/05/28 23:49:03 1.13 --- command/__init__.py 2000/06/15 11:47:58 *************** *** 20,23 **** --- 20,24 ---- 'bdist', 'bdist_dumb', 'bdist_rpm', + 'bdist_wininst', ] Index: command/bdist.py =================================================================== RCS file: /cvsroot/python/distutils/distutils/command/bdist.py,v retrieving revision 1.11 diff -c -r1.11 bdist.py *** command/bdist.py 2000/06/07 03:00:06 1.11 --- command/bdist.py 2000/06/15 11:47:58 *************** *** 38,43 **** --- 38,44 ---- 'tar': ('bdist_dumb',"tar-file"), 'rpm': ('bdist_rpm',"rpm distribution"), 'zip': ('bdist_dumb',"zip-file"), + 'wininst': ('bdist_wininst',"windows installer"), } # prints all possible arguments to --format --------> end patch <-------- --------> start bdist_wininst.py <-------- Implements the Distutils 'bdist_wininst' command: create a windows installer exe-program.""" # created 2000/06/02, Thomas Heller __revision__ = "$Id$" import os, sys from distutils.core import Command from distutils.util import get_platform, create_tree, remove_tree from distutils.errors import * class bdist_wininst (Command): description = "create a \"wininst\" built distribution" user_options = [('bdist-dir=', 'd', "temporary directory for creating the distribution"), ('keep-tree', 'k', "keep the pseudo-installation tree around after " + "creating the distribution archive"), ('target-compile', 'c', "compile to .pyc on the target system"), ('target-optimize', 'o', "compile to .pyo on the target system"), ('target-version=', 'v', "require a specific python version" + " on the target system (1.5 or 1.6)"), ] def initialize_options (self): self.bdist_dir = None self.keep_tree = 0 self.target_compile = 0 self.target_optimize = 0 self.target_version = None # initialize_options() def finalize_options (self): if self.bdist_dir is None: bdist_base = self.get_finalized_command('bdist').bdist_base self.bdist_dir = os.path.join(bdist_base, 'wininst') if not self.target_version: self.target_version = "" else: if not self.target_version in ("1.5", "1.6"): raise DistutilsOptionError ( "target version must be 1.5 or 1.6") if self.distribution.has_ext_modules(): short_version = sys.version[:3] if self.target_version and self.target_version != short_version: raise DistutilsOptionError ("target version can only be" + short_version) self.target_version = short_version # finalize_options() def run (self): self.run_command ('build') # XXX don't use 'self.get_finalized_command()', because it always # runs 'ensure_finalized()' on the command object; we explictly # want a command object that has *not* been finalized, so we can set # options on it! (The option we set, 'root', is so that we can do # a proper "fake install" using this install command object.) install = self.distribution.get_command_obj('install') install.root = self.bdist_dir install_lib = self.distribution.get_command_obj('install_lib') install_lib.compile = 0 install_lib.optimize = 0 # The packager (correct term in distutils speak?) can choose # if pyc and pyo files should be created on the TARGET system # instead at the SOURCE system. ## # The compilation can only be done on the SOURCE system ## # for one python version (assuming 1.6 and 1.5 have incompatible ## # byte-codes). ## short_version = sys.version[:3] ## if self.target_version == short_version: ## if not self.target_compile: ## install_lib.compile = 1 ## if not self.target_optimize: ## install_lib.optimize = 1 install_lib.ensure_finalized() self.announce ("installing to %s" % self.bdist_dir) install.ensure_finalized() install.run() # And make an archive relative to the root of the # pseudo-installation tree. archive_basename = "%s.win32" % self.distribution.get_fullname() # XXX hack! Our archive MUST be relative to sys.prefix # XXX What about .install_data, .install_scripts, ...? root_dir = install.install_lib arcname = self.make_archive (archive_basename, "zip", root_dir=root_dir) self.create_exe (arcname) if not self.keep_tree: remove_tree (self.bdist_dir, self.verbose, self.dry_run) # run() def create_inifile (self): # create an inifile containing data describing the installation. # This could be done without creating a real file, but # a file is (at least) usefull for debugging bdist_wininst. import string metadata = self.distribution.metadata ini_name = "%s.ini" % self.distribution.get_fullname() self.announce ("creating %s" % ini_name) inifile = open (ini_name, "w") # write the [metadata] section. values are written with repr()[1:], # so they do not contain unprintable characters, and are not # surrounded by quote chars inifile.write ("[metadata]\n") # 'info' will be displayed in the installers dialog box, # describing the items to be installed info = metadata.long_description + '\n' for name in dir (metadata): if (name != 'long_description'): data = getattr (metadata, name) if data: info = info + ("\n %s: %s" % \ (string.capitalize (name), data)) inifile.write ("%s=%s\n" % (name, repr (data)[1:-1])) # The [setup] section contains entries controlling # the installer runtime. inifile.write ("\n[Setup]\n") inifile.write ("info=%s\n" % repr (info)[1:-1]) inifile.write ("pthname=%s.%s\n" % (metadata.name, metadata.version)) inifile.write ("pyc_compile=%d\n" % self.target_compile) inifile.write ("pyo_compile=%d\n" % self.target_optimize) if self.target_version: vers_minor = string.split (self.target_version, '.')[1] inifile.write ("vers_minor=%s\n" % vers_minor) title = self.distribution.get_fullname() inifile.write ("title=%s\n" % repr (title)[1:-1]) inifile.close() return ini_name # create_inifile() def create_exe (self, arcname): import struct, zlib cfgdata = open (self.create_inifile()).read() comp_method = zlib.DEFLATED co = zlib.compressobj (zlib.Z_DEFAULT_COMPRESSION, comp_method, -15) zcfgdata = co.compress (cfgdata) + co.flush() installer_name = "%s.win32.exe" % self.distribution.get_fullname() self.announce ("creating %s" % installer_name) file = open (installer_name, "wb") file.write (self.get_exe_bytes ()) file.write (zcfgdata) crc32 = zlib.crc32 (cfgdata) header = struct.pack ("iiiiiiii", 0x12345678, # tag comp_method, # compression method crc32, # checksum len (cfgdata), # uncompressed length len (zcfgdata), # compressed length 0, 0, 0) # reserved fields file.write (header) file.write (open (arcname, "rb").read()) # create_exe() def get_exe_bytes (self): import zlib, base64 return zlib.decompress (base64.decodestring (EXEDATA)) # class bdist_wininst if __name__ == '__main__': import zlib, base64 file = r"c:\wininst\wininst.exe" data = open (file, "rb").read() cdata = zlib.compress (data, 9) bdata = base64.encodestring (cdata) open ("EXEDATA", "w").write (bdata) print "%d %d %d" % (len (data), len 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4 7

Source and patch: swig support (and more)
by Thomas Heller 21 Jun '00

21 Jun '00

The included source code and patch implements a swig class (derived from ccompiler). Currently the swig options used cannot be configured with command-line flags or somehow else although they certainly should. Simply include 'xxx.i' files into your extension source-files, and swig will be used to generate 'xxx.cpp' files, which will then be compiled and linked. Other stuff included (only useful for the windows crowd) Resource scripts (*.rc) and message compiler files (*.mc) can also be used as extension source files, and MSVC will invoke rc.exe and mc.exe to create .res files and pass them to the linker. Comments welcome! Thomas

2 1

Traceback in bdist_rpm
by Bastian Kleineidam 21 Jun '00

21 Jun '00

Hi, I get the following traceback with bdist_rpm command: calvin@treasure:/~/projects/linkchecker> python setup.py bdist_rpm SSL header file ssl.h found, enabling SSL compilation. running bdist_rpm Traceback (innermost last): File "setup.py", line 116, in ? data_files = [('share/locale/de/LC_MESSAGES', File "/usr/lib/python1.5/site-packages/distutils/core.py", line 111, in setup dist.run_commands () File "setup.py", line 47, in run_commands self.run_command (cmd) File "/usr/lib/python1.5/site-packages/distutils/dist.py", line 787, in run_command cmd_obj.ensure_finalized () File "/usr/lib/python1.5/site-packages/distutils/cmd.py", line 95, in ensure_finalized self.finalize_options () File "/usr/lib/python1.5/site-packages/distutils/command/bdist_rpm.py", line 168, in finalize_options self.finalize_package_data() File "/usr/lib/python1.5/site-packages/distutils/command/bdist_rpm.py", line 191, in finalize_package_data self.changelog = self._format_changelog(self.changelog) File "/usr/lib/python1.5/site-packages/distutils/command/bdist_rpm.py", line 440, in _format_changelog for line in string.split(string.strip(changelog), '\n'): TypeError: read-only character buffer, None calvin@treasure:/~/projects/linkchecker> Reason is that the Command.ensure_string() function has default=None and so self.changelog is None and not "". Bastian

5 7

Re: PyXML build problems
by Greg Ward 18 Jun '00

18 Jun '00

[cc'd to distutils-sig, in case anyone out there knows anything about OSF/1 and its progeny] On 18 June 2000, Mark Favas (in private email) said: > The generated ld command above is fine for using through the shell, but > will fail if the quotes are not stripped - the pattern will be a literal > *. If I change the definition for LDSHARED in my > /usr/local/lib/python1.6/config/Makefile from > LDSHARED= ld -shared -expect_unresolved "*" > to > LDSHARED= ld -shared -expect_unresolved * > and re-run "python setup.py build" the link step works fine. The > Makefile is attached. Good thinking -- I was afraid I'd have to implement a general quoting-and-unquoting mechanism when parsing Python's Makefile (or rather, the bits of it that are shell commands). I bet I can get away with an OSF1-specific hack to deal with this problem, though. ;-) Note that (I think) your fix will break builds with the old Makefile.pre.in mechanism, so you'll want to go back to the original Makefile once I've fixed Distutils. BTW, what do os.uname() and sys.platform return on your system? Do you know how consistent these are across various flavours of OSF/1? Also, didn't OSF/1 mutate into Digital Unix, and then Tru64 Unix? Do you know if these later versions are similarly affected? Thanks -- Greg -- Greg Ward - programmer-at-big gward(a)python.net http://starship.python.net/~gward/ Never try to outstubborn a cat.

1 0

OSF/1 glitch?
by A.M. Kuchling 17 Jun '00

17 Jun '00

This was reported on the XML-SIG by Mark Favas, and looks like it might be a Distutils problem. ================= The link step also appears to have a wildcard quoting problem. The ld command used is: ld -shared -expect_unresolved "*" build/temp.osf1V-alpha/extensions/pyexpat.o build/temp.osf1V-alpha/extensions/expat/xmltok/xmltok.o build/temp.osf1V-alpha/extensions/expat/xmltok/xmlrole.o ... which works correctly if put into a /bin/sh script produces pyexpat.so without warnings of unresolved externals (the -expect_unresolved "*" pattern matches all). However, when run by Python via the "python setup.py build" command, ld complains about all the unresolved externals: ld: Warning: Unresolved: fread strlen strncpy strcmp ... as if the pattern that ld is trying to match is literally "*" ================= Presumably the link step quotes the * for the sake of the shell, and sysconfig.py doesn't know this, so it winds up passing "*" as the argument. --amk

3 2

remove_tree and PATH_CREATED
by Bastian Kleineidam 17 Jun '00

17 Jun '00

Hi, in dir_util.py we have a cache which directories are created: PATH_CREATED. This is filled by mkpath. But it is not emptied by remove_tree because we use shutil.rmtree for this. Reproduce: run "python setup.py sdist bdist_rpm" sdist creates a distribution dir, then deletes it. bdist_rpm runs sdist again and the distribution dir is not created a second time because its in the cache PATH_CREATED. Solution 1: find all directories to be removed and remove them out of PATH_CREATED. However if rmtree gives an error we removed probably too much. Solution 2: get rid of the PATH_CREATED cache. Not a good solution. Solution 3: write your own rmtree function. I would prefer this solution. Bastian

2 3

Fw: CPAN for python?
by Thomas Heller 08 Jun '00

08 Jun '00

[Doesn't this also belong to distutils?] From: "Andrew Kuchling" <akuchlin(a)mems-exchange.org> Newsgroups: comp.lang.python To: <python-list(a)python.org> Sent: Thursday, June 08, 2000 4:05 AM Subject: Re: CPAN for python? > [...] The distutils work seems to > be freezing down nicely; the discussions have gone from requirements > to design to implementation, and are now doing the i-dotting and > t-crossing fixes, with the occasional slightly larger upheaval. But > the basic principle of running setup.py seems stable. > > So, what would people want on top of distutils? A Debian-style "do > apt-get, upgrade" to update currently installed packages? A > CPAN-style "fetch and install this module for me, please"? Simple > version checking? > > --amk > -- > http://www.python.org/mailman/listinfo/python-list

1 0

New snapshot (soon)
by Greg Ward 08 Jun '00

08 Jun '00

Hi all -- I have just thrown together a new Distutils code snapshot. This is the first of several that will lead up to Distutils 0.9, which I hope to release before Python 1.6a3 (whenever that comes). (And assuming that it's not 1.6b1!) It's not available right now, but should be soon: see http://www.python.org/sigs/distutils-sig/download.html#snapshot Greg -- Greg Ward - geek-on-the-loose gward(a)python.net http://starship.python.net/~gward/ "One world, one web, one program" --Microsoft "Eine volk, eine reich, eine führer" --Hitler

1 0