Output from https://gist.github.com/motin/cca880c647263eb5e98d9f1e0d60a3c5 on Docker 1.8.3 running on Debian

out.txt

+ docker version
Client:
 Version:      1.8.3
 API version:  1.20
 Go version:   go1.4.2
 Git commit:   f4bf5c7
 Built:        Mon Oct 12 18:01:15 UTC 2015
 OS/Arch:      linux/amd64

Server:
 Version:      1.8.3
 API version:  1.20
 Go version:   go1.4.2
 Git commit:   f4bf5c7
 Built:        Mon Oct 12 18:01:15 UTC 2015
 OS/Arch:      linux/amd64
+ docker info
Containers: 605
Images: 1383
Storage Driver: aufs
 Root Dir: /var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 2791
 Dirperm1 Supported: false
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.13.0-43-generic
Operating System: Ubuntu 14.04.2 LTS
CPUs: 8
Total Memory: 31.29 GiB
Name: Ubuntu-1404-trusty-64-minimal
ID: TUFR:JOW4:JPRW:D3Y5:LCWS:65EL:N6JV:KY4P:MGKW:YIBB:F4CT:LWDW
Username: neam
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
+ docker build -t test .
Sending build context to Docker daemon 100.1 MB
Step 0 : FROM busybox
latest: Pulling from library/busybox
4b51ded9aed1: Pull complete
307ac631f1b5: Pull complete
Digest: sha256:4a887a2326ec9e0fa90cce7b4764b0e627b5d6afcb81a3f73c85dc29cea00048
Status: Downloaded newer image for busybox:latest
 ---> 307ac631f1b5
Step 1 : COPY . /
 ---> 793caa88e193
Removing intermediate container d4bd6ec0366c
Successfully built 793caa88e193
+ echo foo
+ docker build -t test -f Dockerfile.update .
Sending build context to Docker daemon 100.1 MB
Step 0 : FROM test
 ---> 793caa88e193
Step 1 : COPY . /
 ---> c53f88667bf1
Removing intermediate container a89281617085
Successfully built c53f88667bf1
+ docker history test
IMAGE               CREATED                  CREATED BY                                      SIZE                COMMENT
c53f88667bf1        Less than a second ago   /bin/sh -c #(nop) COPY dir:2fcafecf85c963b241   100 MB
793caa88e193        2 seconds ago            /bin/sh -c #(nop) COPY dir:cc0363f100495a48ff   100 MB
307ac631f1b5        3 weeks ago              /bin/sh -c #(nop) CMD ["sh"]                    0 B
4b51ded9aed1        3 weeks ago              /bin/sh -c #(nop) ADD file:47ca6e777c36a4cfff   1.113 MB