The diff on output from rpm -ql --provides glibc is:

--- /tmp/old.log        2007-03-20 20:33:58.000000000 +0100
+++ /tmp/new.log        2007-03-20 20:33:45.000000000 +0100
@@ -232,7 +232,7 @@
UTF-32.so UTF-7.so VISCII.so -config(glibc) = 2.5.90-17
+config(glibc) = 2.5.90-19
ld-linux.so.2 ld-linux.so.2(GLIBC_2.0) ld-linux.so.2(GLIBC_2.1) @@ -322,7 +322,7 @@
libutil.so.1 libutil.so.1(GLIBC_2.0) rtld(GNU_HASH) -glibc = 2.5.90-17
+glibc = 2.5.90-19
/etc/ld.so.conf
/etc/ld.so.conf.d
/etc/localtime

Ok, almost nothing is changed =>
if old glibc is good, then the new glibc is good too, no need to check anything, just
do the upgrade.

However, look at this:

# python yummain.py -d100 -e100 install glibc | tee /tmp/yum.log

# grep -c 'looking at' /tmp/glibc.log
38595

# grep -c 'looking to see what requires' /tmp/glibc.log
20974

60000 checks!

How can this be needed?

May be because the Prco from the rpmdb look like this:
('tla', None, ('0', None, None))

And the Prco from the sqlite db look like that:
('tla', 0, (None, None, None))

Which makes this oldreqs cheater lookup fail in >95% of all cases in _checkInstall().

As changing one of them will likely break a lot of other places I leave the fixing as exercise for the reader ;)=

Florian
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