It seems like a lsb_release program should be available on any distro if
the appropriate package is installed. So it seems better to use
lsb_release instead of /etc/lsb-release, because Debian doesn't appear
to have /etc/lsb-release.
Allow each builder to cache some files for re-use in the next build. This
allows for poor-man's dependency chaining.
Additionally, add a common cache pool for all builds. This can be used for
saving (for example) downloaded files to be shared between builds.
I was running into trouble using gitian LXC INSIDE a VirtualBox VM, because
the 10.0.2.x IP range overlaps with the range that VirtualBox uses for
its internal NAT network.
This commit makes it possible to override the host and guest IP that
is used during LXC image creation and the build, using environment variables:
- `GITIAN_HOST_IP` (default=10.0.2.2, host IP from the viewpoint of the
VM, can be used for both LXC and KVM)
- `LXC_GUEST_IP` (default=10.0.2.5, guest IP from the viewpoint of the
host, effective for LXC only)
When these are not defined the behavior remains the same as before.