I created few chroot image, each conteaining a Gentoo Linux minimal image. I do bind-mount a directory from the host (~35 GB of downloaded package files) onto a directory of each of the chroots to save space and bandwith. A "du -ms" however counts that value just for the first listed directories:
tor-relay /mnt/qa/tinderbox # du -ms amd64-hardened-stable_* amd64-hardened-unstable_* 2>/dev/null 42318 amd64-hardened-stable_20150513-221439 11948 amd64-hardened-unstable_20150513-215830 tor-relay /mnt/qa/tinderbox # du -ms amd64-hardened-unstable_* amd64-hardened-stable_* 2>/dev/null 48790 amd64-hardened-unstable_20150513-215830 5434 amd64-hardened-stable_20150513-221439 Pls Cc:- me - I'm not subscribed tor-relay /mnt/qa/tinderbox # eix -I sys-apps/coreutils [I] sys-apps/coreutils Available versions: 8.20 8.21 ~8.22 ~8.22-r1 ~8.23 {acl caps gmp multicall nls selinux static vanilla xattr USERLAND="BSD"} Installed versions: 8.21(11:34:15 AM 10/25/2014)(acl nls xattr -caps -gmp -selinux -static -vanilla USERLAND="-BSD") Homepage: http://www.gnu.org/software/coreutils/ Description: Standard GNU file utilities (chmod, cp, dd, dir, ls...), text utilities (sort, tr, head, wc..), and shell utilities (whoami, who,...) -- Toralf pgp key: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 0076 E94E -- "; the past is all dirty and cruel in the modern popular imagination, with the exception of the Romans, who are just cruel" Ian Mortimer, 2008, "The Time Traveller's Guide to Medieval England"