Merge pull request #268458 from Mic92/dockertools

            (cd old_out; eval "$extraCommands" )

            mkdir $out

            ${optionalString enableFakechroot ''proot -r $PWD/old_out ${bind-paths} --pwd=/ ''}fakeroot bash -c '

            ${if enableFakechroot then ''

              proot -r $PWD/old_out ${bind-paths} --pwd=/ --root-id bash -c '

                source $stdenv/setup

              ${optionalString (!enableFakechroot) ''cd old_out''}

                eval "$fakeRootCommands"

                tar \

                  --sort name \

                  --exclude=./proc \

                  --exclude=./sys \

                  --numeric-owner --mtime "@$SOURCE_DATE_EPOCH" \

                  --hard-dereference \

                  -cf $out/layer.tar .

              '

            '' else ''

              fakeroot bash -c '

                source $stdenv/setup

                cd old_out

                eval "$fakeRootCommands"

                tar \

                  --sort name \

                  --numeric-owner --mtime "@$SOURCE_DATE_EPOCH" \

                  --hard-dereference \

                  -cf $out/layer.tar .

              '

            ''}

            sha256sum $out/layer.tar \

              | cut -f 1 -d ' ' \

              > $out/checksum