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Description of problem:
When I run 
sudo rpm -Uvh --root /tftpboot/node_root ...
It fails.
However, if I su as root, then run
rpm -Uvh --root /tftpboot/node_root
It works.

Version-Release number of selected component (if applicable):
rpm-4.4.1-21, sudo-1.6.8p8-1

How reproducible:
Always

Steps to Reproduce:
1. as root
2. mkdir -p /tftpboot/node_root/var/lib/rpm/
3. rsync -a /var/lib/rpm/* /tftpboot/node_root/var/lib/rpm/
4. sudo rpm -Uvh -v -v -v -v -v --root /tftpboot/node_root/ --force --nodeps --noscripts http://free.nchc.org.tw//fedora/linux/core/4/i386/os/Fedora/RPMS/kernel-2.6.11-1.1369_FC4.i586.rpm

  

Actual Results:  The resulet is
---
Retrieving http://free.nchc.org.tw//fedora/linux/core/4/i386/os/Fedora/RPMS/kernel-2.6.11-1.1369_FC4.i586.rpm
error: skipping http://free.nchc.org.tw//fedora/linux/core/4/i386/os/Fedora/RPMS/kernel-2.6.11-1.1369_FC4.i586.rpm - transfer failed - Unknown or unexpected error



Expected Results:  Install the kernel-2.6.11-1.1369_FC4.i586.rpm in /tftpboot/node_root successfully with sudo.


Additional info:

By adding more "-v", i.e.
sudo rpm -Uvh -v -v -v -v -v --root /tftpboot/node_root/ --force --nodeps --noscripts http://free.nchc.org.tw//fedora/linux/core/4/i386/os/Fedora/RPMS/kernel-2.6.11-1.1369_FC4.i586.rpm

The results show
---
Retrieving http://free.nchc.org.tw//fedora/linux/core/4/i386/os/Fedora/RPMS/kernel-2.6.11-1.1369_FC4.i586.rpm
D:  ... as /tftpboot/node_root/home/steven/rpmbuild/tmp/rpm-xfer.5dIm3z
D: failed to create /tftpboot/node_root/home/steven/rpmbuild/tmp/rpm-xfer.5dIm3z: No such file or directory
error: skipping http://free.nchc.org.tw//fedora/linux/core/4/i386/os/Fedora/RPMS/kernel-2.6.11-1.1369_FC4.i586.rpm - transfer failed - Unknown or unexpected error
D: May free Score board((nil))
---
So I think rpm should can use another temp directory if it can not find the one it want.