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Basic dependency checking. setup() has two new optional arguments

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requires and provides. requires is a sequence of strings, of the
form 'packagename-version'. The dependency checking so far merely
does an '__import__(packagename)' and checks for packagename.__version__
You can also leave off the version, and any version of the package
will be installed.
There's a special case for the package 'python' - sys.version_info
is used, so
requires= ( 'python-2.3', )
just works.

Provides is of the same format as requires - but if it's not supplied,
a provides is generated by adding the version to each entry in packages,
or modules if packages isn't there.
Provides is currently only used in the PKG-INFO file. Shortly, PyPI
will grow the ability to accept these lines, and register will be
updated to send them.

There's a new command 'checkdep' command that runs these checks.
For this version, only greater-than-or-equal checking is done. We'll
add the ability to specify an optional operator later.
This commit is contained in:
Anthony Baxter 2004-03-22 22:22:05 +00:00
parent a3837a0d63
commit 05f842bae2
5 changed files with 144 additions and 3 deletions
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13
Lib/distutils/command/install.py
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@ -126,6 +126,8 @@ class install (Command):
"force installation (overwrite any existing files)"),
('skip-build', None,
"skip rebuilding everything (for testing/debugging)"),
('skip-checkdep', None,
"skip checking dependencies (use at own risk)"),
# Where to install documentation (eventually!)
#('doc-format=', None, "format of documentation to generate"),
@ -183,12 +185,15 @@ class install (Command):
# 'force' forces installation, even if target files are not
# out-of-date. 'skip_build' skips running the "build" command,
# handy if you know it's not necessary. 'warn_dir' (which is *not*
# handy if you know it's not necessary. 'skip_checkdep' skips
# the 'checkdep' command, if you are sure you can work around the
# dependency failure in another way. 'warn_dir' (which is *not*
# a user option, it's just there so the bdist_* commands can turn
# it off) determines whether we warn about installing to a
# directory not in sys.path.
self.force = 0
self.skip_build = 0
self.skip_checkdep = 0
self.warn_dir = 1
# These are only here as a conduit from the 'build' command to the
@ -500,6 +505,12 @@ class install (Command):
if not self.skip_build:
self.run_command('build')
# We check dependencies before we install
# For now, this is disabled. Before 2.4 is released, this will
# be turned on.
#if not self.skip_checkdep:
# self.run_command('checkdep')
# Run all sub-commands (at least those that need to be run)
for cmd_name in self.get_sub_commands():
self.run_command(cmd_name)