Re: [gentoo-dev] revdep-rebuild

[Stefan Jones]

Stefan Jones wrote:

>So I have started making a small C program which does the
>"Checking dynamic linking consistency..." part of the revdep-rebuild
>program (I think this the the most time intensive part).
>
>This program can then be called by the script.
>
>So far all I see the program needing to do is
>read /root/.revdep-rebuild.1_files and
>use /root/.revdep-rebuild.2_ldpath as the LD_LIBRARY_PATH
>and write any bad files to /root/.revdep-rebuild.3_rebuild
>
>
>

I have finished doing the above for linux/glibc, it can be found at 
http://dev.gentoo.org/~cretin/revdep-rebuild.tar.bz2

I just made a small C-program to check the dependencies, it uses 
ld-linux.so.2 check if the file is an ELF and then to check if it's 
libraries are present.

For other archs you can use present system or do something else, the 
original revdep-rebuild script is still used, just a bit is cut out and 
uses the binary instead, so other archs can use the old code easily.

The speed up is quite noticeable:
( see results.txt in the tarball )

Now we have:
real    0m46.803s
user    0m4.544s
sys     0m41.075s

Instead of:
real    8m12.674s
user    0m20.569s
sys     7m41.593s

for revdep-rebuild --keep-temp -i -- -p

Anyway, this is really proof of concept only, can do another version 
using scanelf using a list from another source of all available system 
libraries (ldconfig -p on linux)

Stefan
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