Created attachment 796552 [details]
Local repository configuration

Description of problem:

Yum rebuilds rpms from deltarpms even for local (file://) repositories. In the case of for local repositories - yum shall not use deltarpms if full rpms exist or it shall be possible to configure deltarpms usage in the repository section.

Version-Release number of selected component (if applicable):

yum-3.4.3-106.fc19.noarch
yum-3.4.3-110.fc19.noarch

How reproducible:

Steps to Reproduce:

1. Configure local repository, for example, /etc/yum.repos.d/fedora-updates-local.repo (see config attached)
2. Populate the repository
3. Run yum -d 2 update 
4. Observe that yum rebuilds /var/cache/yum rpms using deltarpms 

Actual results:

yum prints
...
<locally rebuilding deltarpms>           12% [===-                          ] 381 kB/s | 6.6 MB  00:01:59 ETA
...
Delta RPMs reduced 51 M of updates to 6.9 M (86% saved)
Finishing delta rebuilds of 19 package(s) (51 M)

Cache directory is filled with rpms 

# ls -l /var/cache/yum/x86_64/19/updates-local/packages/
total 80072
...
-rw-r--r--. 1 root root  1139532 Sep 11 16:23 gnome-settings-daemon-3.8.5-1.fc19.x86_64.rpm
-rw-r--r--. 1 root root    52352 Sep 11 16:23 gnome-settings-daemon-updates-3.8.5-1.fc19.x86_64.rpm
...

Expected results:

yum skips rpms rebuild as the repository is local. Cache directory is not filled.

Additional info:

As a workaround I added deltarpm_percentage=1 to the repository section. Note that deltarpm_percentage=0 produces the error below. 

Error parsing "deltarpm_percentage = '0'": out of range integer value

It would be nice if yum can be configured so

a. local repositories do not have rpms rebuild from deltarpms if full rpms exists in the repository.
b. or it is possible to disable deltarpm in the repository sections
c. or deltarpms are used only for repositories that are high cost, something like deltarpm_min_cost=10 and deltarpms are not used if cost < 10.