Re: Caution! Bad SONAME Provides

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On 22-jun-2007, at 17:02, Michael Schwendt wrote:

Broken dependencies are one thing, broken "Provides" another.

The distribution includes an increasing number of packages, which don't filter their SONAME Provides when they include shared libraries in private
paths.

This can have devastating effects in conjunction with yum's "shortest
package name wins" during depsolving. For example:

  libfoo  provides  libfoo.so.1   for %{_libdir}/libfoo.so.1
bar provides libfoo.so.1 for %{_libdir}/bar/plugins/ libfoo.so.1.0.0

Only for libfoo the automatic "Provides: libfoo.so.1" is sane. And even if "bar" extended the ld.so configuration, it would conflict with libfoo in
what it provides.

I've reported a few such cases. All the others look like packages provide sonames for plugin libraries without actually conflicting with any library package in the Fedora Collection. Still it's dangerous if multiple packages provide "libfoo.so" (versioned or not), but neither one puts the library
into run-time linker's search path. Sooner or later such dependencies
might explode at run-time.

Funny, a user of one of my packages, csync2, reported upstream that he had a problem with my package on F-7. He got "unresolved symbol" errors. It turns out that somehow csync2 got linked to sqlite3, while it has a BuildRequires on sqlite2-devel

Until reading this thread, I had no idea how this happened, so I installed F-7 on a new box, and did a yum install csync2. Yum wanted to pull in dbmail as a dependency, but that's strange, since csync2 shouldn't use dbmail.

Turns out dbmail provides libsqlite.so.0 (it's in /usr/lib/dbmail/ libsqlite.so.0), which is a sqlite3 library.

I'm glad I've found this, but it would be great if we could somehow prevent things like this happening.

Ruben

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