Please consider merging branch `apt-cacher-ng` of repo `https://git.spwhitton.name/propellor`. Sample text for changelog/description of changes: * Add Apt.proxy property to set a host's apt proxy. * Add Apt.useLocalCacher property to set up apt-cacher-ng. * Rework Sbuild properties to use apt proxies/cachers instead of bind-mounting the host's apt cache. This makes it possible to run more than one build at a time, and lets sbuild run even if apt's cache is locked by the host's apt. - If Apt.proxy is set, it is assumed that the proxy does some sort of caching, and sbuild chroots are set up to use the same proxy. - If Apt.proxy is not set, we install apt-cacher-ng, and point sbuild chroots at the local apt cacher. - Drop Sbuild.piupartsConfFor, Sbuild.piupartsConf, Sbuild.shareAptCache (API change) No longer needed now that we are using apt proxies/cachers. - Update sample config in haddock for Propellor.Property.Sbuild. Please compare both your config.hs and your ~/.sbuildrc against the haddock. --spwhitton > merge [[done]] --[[Joey]]