I run the following command:

  boxgrinder-build appliances/centos-5.appl -p ec2 -d ebs

which would like to create a centos 5.5 image, but I received the following error:

er_build-local-repo -c build/appliances/i686/centos/5/centos-5/centos-plugin/tmp/yum.conf list available bash kernel-PAE grub e2fsprogs passwd policycoreutils chkconfig curl rootfiles yum vim-minimal acpid dhclient iputils openssh-server openssh-clients httpd system-config-firewall-base ntp which system-config-securitylevel-tui --nevra --archlist=i386,i486,i586,i686,noarch'
D, [2010-10-22T10:26:08.148765 #2744] DEBUG -- : Cannot retrieve repository metadata (repomd.xml) for repository: boxgrinder_build-centos-5-base. Please verify its path and try again

I don't like

D, [2010-10-22T10:26:07.368397 #2744] DEBUG -- : Reading definition from 'appliances/centos-5.appl' file...
I, [2010-10-22T10:26:07.374675 #2744]  INFO -- : Building 'centos-5' appliance for i686 architecture.

because it generates

/root/build/appliances/i686/centos/5/centos-5/centos-plugin/tmp/yum.conf which contains:
[main]
cachedir=/root/build/appliances/i686/centos/5/centos-5/centos-plugin/tmp/boxgrinder_build-i686-yum-cache/

[boxgrinder_build-centos-5-base]
name=centos-5-base
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=i686&repo=os
enabled=1

[boxgrinder_build-centos-5-updates]
name=centos-5-updates
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=i686&repo=updates
enabled=1

[boxgrinder_build-local-repo]
name=local-repo
baseurl=http://mirror.centos.org/centos/5.5/os/i386/CentOS
enabled=1

but we don't have i686, but i386!

here is my centos-5.appl

name: centos-5
summary: CentOS 5.5 on EC2
os:
name: centos
version: 5
hardware:
partitions:
   "/":
     size: 40
repos:
  - name: "local-repo"
    baseurl: "http://mirror.centos.org/centos/5.5/os/i386/CentOS"
    ephemeral: true
packages:
includes:
   - bash
   - kernel-PAE
   - grub
   - e2fsprogs
   - passwd
   - policycoreutils
   - chkconfig
   - curl
   - rootfiles
   - yum
   - vim-minimal
   - acpid
   - dhclient
   - iputils
   - openssh-server
   - openssh-clients
   - httpd
   - system-config-firewall-base
   - ntp
   - which