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Date: Wed, 29 Oct 2008 21:31:56 -0400
From: "Andrey Vul" <andrey.vul@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] A question about emerge --info
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On Wed, Oct 29, 2008 at 8:47 PM, Joshua Murphy <poisonbl@gmail.com> wrote:
> On Wed, Oct 29, 2008 at 7:51 PM, Andrey Vul <andrey.vul@gmail.com> wrote:
> <snip>
>> elif system in ('Linux',):
>> # Linux based systems
>> distname,distversion,distid = dist('')
>> if distname and not terse:
>> platform = _platform(system,release,machine,processor,
>> 'with',
>> distname,distversion,distid)
>> else:
>> # If the distribution name is unknown check for libc vs. glibc
>> libcname,libcversion = libc_ver(sys.executable)
>> platform = _platform(system,release,machine,processor,
>> 'with',
>> libcname+libcversion)
> <snip>
>
> Hrm. I know just enough about python to get myself in trouble here...
> but it looks like a python bug in magicking up the libc name and
> version... but the below is WAY outside my level of practice with
> python (it'll take re-reading and digging elsewhere a good few times
> if I'm ever to make sense of it...
>
> ------------------
> def libc_ver(executable=sys.executable,lib='',version='',
>
> chunksize=2048):
>
> """ Tries to determine the libc version that the file executable
> (which defaults to the Python interpreter) is linked against.
>
> Returns a tuple of strings (lib,version) which default to the
> given parameters in case the lookup fails.
>
> Note that the function has intimate knowledge of how different
> libc versions add symbols to the executable and thus is probably
> only useable for executables compiled using gcc.
>
> The file is read and scanned in chunks of chunksize bytes.
>
> """
> f = open(executable,'rb')
> binary = f.read(chunksize)
> pos = 0
> while 1:
> m = _libc_search.search(binary,pos)
> if not m:
> binary = f.read(chunksize)
> if not binary:
> break
> pos = 0
> continue
> libcinit,glibc,glibcversion,so,threads,soversion = m.groups()
> if libcinit and not lib:
> lib = 'libc'
> elif glibc:
> if lib != 'glibc':
> lib = 'glibc'
> version = glibcversion
> elif glibcversion > version:
> version = glibcversion
> elif so:
> if lib != 'glibc':
> lib = 'libc'
> if soversion > version:
> version = soversion
> if threads and version[-len(threads):] != threads:
> version = version + threads
> pos = m.end()
> f.close()
> return lib,version
> ------------------
>
> It parses the header of an executable and guesses, but... the how is
> too many directions from this that I'm not seeing it with my haphazard
> abuse of grep. I'd presume anything that might care what platform it's
> running on (underneath python itself) would be susceptible, so a word
> thrown in the direction of upstream python would be the main way to
> go... though it looks like emerge didn't used to use that call...
>
> Portage 2.1.4.5 (default/linux/x86/2008.0, gcc-4.1.2, glibc-2.6.1-r0,
> 2.6.25-gentoo-r7-mahain i686)
> =================================================================
> System uname: 2.6.25-gentoo-r7-mahain i686 AMD Athlon(tm) MP 2400+
>
> is my output, based on a call in emerge to "uname -mrp" .. not
> platform.platform()
>
> Looks like gentoo-dev aimed to drop that dependency in newer versions after all.
The creator of paludis was right ... portage is a jack of all trades
and a master of none.
--
Andrey Vul
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?