There are two main scenarios:
1) The host with live-build is configured to use a proxy
This proxy will automatically be used by live-build
2) The user of live-build explicitly specifies a proxy
2A) With the environment variable 'http_proxy' (preferred)
2B) With the command line option --apt-http-proxy
Any inconsistency in the setting of a proxy results in an error message of 'lb config'
All internal tools (apt/apt-get/aptitude, wget and debootstrap) use the environment variables 'http_proxy' and 'no_proxy', which are passed along to the chroot where needed.
Test scenario:
- A virtual machine with all out-going traffic blocked, except for the proxy.
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