Le 29/12/2011 22:56, Bruce Dubbs a écrit :
> Bryan Kadzban wrote:
>> Sorry, this won't thread properly -- but I deleted the original before I
>> realized I wanted to reply, so now I have to copy from the archives, and
>> the archives don't have the right message-ids. :-/
>>
>> Matthew Burgess wrote:
>>> On Wed, 2011-12-28 at 15:01 +0100, Pierre Labastie wrote:
>>>
>>>> I meant `current trunk' too. The change in version 3537 is not enough.
>>>> Here is what I have done (not checked on any other system than Debian,
>>>> but I do not see a reason why it would not work):
>>>> # if [ -f /lib/libc.so.6 ]; then
>>>> # libcLoc=/lib;
>>>> # elif [ -f /lib64/libc.so.6 ]; then
>>>> # libcLoc=/lib64;
>>>> # fi;
>>>> # libcVer="`/${libcLoc}/libc.so.6 | head -n1`"
>>>> libcExec="`find /lib /lib64 -name libc.so.6 -print`"
>>>> libcVer="`/${libcExec} | head -n1`"
>>> How odd. I was going to suggest you run some tests so I can figure out
>>> why r3537 isn't enough for Debian systems, but your version is a lot
>>> more compact and appears to work on my Fedora host too, so I may as well
>>> just drop it straight in. Thanks for the fix.
>> Why don't we do something a bit less fragile? The Linux ABI requires
>> that the dynamic linker be at the path /lib/ld-linux.so.2 (or
>> /lib64/ld-linux-x86-64.so.2 for 64-bit), so we could just use that fact,
>> along with ld.so's ability to print the soname -> filename resolution,
>> and ask /bin/ls which C library it's using:
>>
>> ldd /bin/ls | awk '/libc\.so/ {print $3;}'
>>
>> This works on 64-bit Ubuntu Hardy and an old 32-bit LFS. I don't have
>> anything else to test it on though. (It'd be nice if ld.so had a flag
>> to print the library it'd use for a given soname. Oh well.) We don't
>> actually care whether we're asking the 32-bit or 64-bit libc for its
>> version, since both should be the same.
> I think that idea is fine, but wonder about the use of awk. It may not
> be available. Perhaps:
>
> ldd /bin/ls | grep '/libc.*so'
>
> I don't think stripping the cruft is really necessary.
>
It seems to me that stripping is necessary, because we need to call
the library to get the version string. The full replacement could be:
libcLib="$(ldd /bin/ls | grep libc.so | cut -d' ' -f3)|"
/${libcLib} | head -n1 | cut -d"," -f1|
`cut' is used at other places in the script.
Pierre
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