On 5.5 you need to install python-hashlib and python-createrepo RPM
packages. These required packages are installed if you are using koji
RPM.
The createrepo task creates the repository with the python library and
not with createrepo command and createrepo RPM on
REHL5.5 don't contain this library.
Pierre,
I forgot to add that I did see your post... ;-)
And here's the installed RPMs on my box...
$ sudo rpm -qa | grep 'createrepo\|hashlib\|koji'
koji-web-1.4.0-2.el5.noarch
createrepo-0.4.11-3.el5.noarch
koji-hub-1.4.0-2.el5.noarch
koji-1.4.0-2.el5.noarch
koji-utils-1.4.0-2.el5.noarch
koji-builder-1.4.0-2.el5.noarch
python-createrepo-0.9.6-1.el5.noarch
koji-hub-plugins-1.4.0-2.el5.noarch
python-hashlib-20081119-4.el5.i386
-Allen