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Description of problem:
(Disclaimer: I've noticed this problem using the Whitebox RHEL
rebuild, I haven't had chance to confirm it happens with proper RHEL,
I imagine it does)

I have a Squid proxy set up, with a tendency to retain RPMs for
longer, which I use to fetch package updates through, as opposed to
maintaining my own copies of the whole package trees.

As part of my kickstart %post script, I create /etc/profile.d/proxy.*
files containing the *_proxy environment variables so all shells get
set correctly to use the proxy.

Another thing I do within the %post script is to run 'up2date -f -u'
to pull all of the latest updates in, and I ideally want to use the
proxy for this step so prior to that I source the
/etc/profile.d/proxy.sh to set the correct environment variables.

What I found with some of my kickstart installs was that it was
ignoring the proxy completely and downloading directly from each
package repository.

I traced the difference down to some kickstart scripts where I
explicitly ran '/usr/sbin/up2date', these worked, but the ones where I
just ran 'up2date' relying on the $PATH to do the dirty work, these
didn't work.

Using the Alt+F2 terminal within the installer environment I can
replicate this whilst chrooted into /mnt/sysimage with the proxy
environment variables set:

Works: /usr/sbin/up2date or ./up2date with $PWD == /usr/sbin
Doesn't work: up2date

Once I've rebooted to the installation, up2date works correctly on all
invocations, so it seems to be some strange interaction with the
installation environment.

Workaround is to explicitly state the full path to the up2date binary
in the kickstart script.

Version-Release number of selected component (if applicable):
4.1.16

How reproducible:
Always

Steps to Reproduce:
1. Within kickstart %post script, create environment variables
pointing to Squid proxy
2. Run 'up2date -f -u'
3. Examine Squid proxy logs
    

Actual Results:  Logs show no client access from kickstart client.

Expected Results:  Logs should show kickstart client pulling Yum
headers and RPM packages through proxy, (wherever possible).

Additional info: