Bug 475882

Description of problem:
rpm states "no package requires ..." when the package name is not explicitly stated in the requires: in other packages. Therefore it states that the package is not needed. Removal of the package is prohibited since a part of the package is required by another package. It seems that the requires/provides mechanisms operate differently from the checks done at uninstall.


Version-Release number of selected component (if applicable):
Versions used:
$ rpm -q rpm
rpm-4.6.0-0.rc1.8.i386

For the example below:
$ rpm -q php-pgsql
php-pgsql-5.2.6-5.i386
$ rpm -q postgresql-libs
postgresql-libs-8.3.5-1.fc10.i386


How reproducible:
Always.


Steps to Reproduce:
Example:
Found a package which is apparently not required by another package.
$ rpm -q --whatrequires postgresql-libs
no package requires postgresql-libs

Try to uninstall it.
# rpm -e postgresql-libs
error: Failed dependencies:
	libpq.so.5 is needed by (installed) php-pgsql-5.2.6-5.i386
	libpq.so.5 is needed by (installed) redland-1.0.7-2.fc10.i386
Fails, fortunately, while the package is actually required, although not
by the name, only by one of the libraries it provides.

RPM is aware of these provides/requires link when queried:

What does the package postgresql-libs provide?
$ rpm -q --provides postgresql-libs
libecpg.so.6  
libecpg_compat.so.3  
libpgtypes.so.3  
libpq.so  
libpq.so.5  
postgresql-libs = 8.3.5-1.fc10
postgresql-libs(x86-32) = 8.3.5-1.fc10

Which package provides libpq.so.5?
$ rpm -q --whatprovides libpq.so.5
postgresql-libs-8.3.5-1.fc10.i386

What is required by package php-pgsql?
$ rpm -q --requires php-pgsql
config(php-pgsql) = 5.2.6-5
libc.so.6  
libc.so.6(GLIBC_2.0)  
libc.so.6(GLIBC_2.1.3)  
libc.so.6(GLIBC_2.3)  
libc.so.6(GLIBC_2.4)  
libpq.so.5  
php-common = 5.2.6-5
php-pdo  
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rtld(GNU_HASH)  


Actual results:
$ rpm -q --whatrequires postgresql-libs
no package requires postgresql-libs


Expected results:
$ rpm -q --whatrequires postgresql-libs
	libpq.so.5 (in postgresql-libs) is needed by (installed) php-pgsql-5.2.6-5.i386
	libpq.so.5 (in postgresql-libs) is needed by (installed) redland-1.0.7-2.fc10.i386

The link of the library in question with the actual package name would be greatly appreciated (for both query and uninstall). It is very useful when uninstalling multiple packages by hand.


Additional info:
None.