Canonical way to load checksum in Dockerfile?

Question

I create a Docker file that downloads, creates, installs node.js from the source. I would like to download the checksum before creating it and stop or exit the Docker file if the checksum failed:

# officially supported ubuntu
FROM ubuntu:12.04

# SETUP
RUN cd /tmp
RUN apt-get update -y
RUN apt-get install wget build-essential automake -y
RUN wget http://nodejs.org/dist/latest/node-v0.10.26.tar.gz
RUN wget http://nodejs.org/dist/latest/SHASUMS256.txt

# RUN checksum: exit on fail, continue on success
??? how ???

# INSTALL
RUN tar -xvf node-v0.10.26.tar.gz && cd node-v0.10.26
RUN ./configure && make && make install

# CLEANUP
apt-get autoremove --purge wget build-essential automake -y

Did the Docker community use best practices?

Answer 1

If any of the commands RUNreturns a non-zero code, the assembly will fail.

FROM fedora
RUN false

Docker, , false. false - linux, , . , Dockerfile, .

$ docker build .
Uploading context 12.29 kB
Uploading context
Step 0 : FROM fedora
 ---> 58394af37342
Step 1 : RUN false
 ---> Running in a5b9a4b37e25
2014/04/22 09:41:19 The command [/bin/sh -c false] returned a non-zero code: 1

, ( , , wget), . , . , , , , , .

FROM fedora

# Create the text file
RUN echo ThisIsATest > echo.txt

# Calculate the checksum
RUN sha1sum echo.txt > sha1sums.txt

# Validate the checksum (this should pass)
RUN sha1sum -c sha1sums.txt

# Alter the text
RUN echo ThisShouldFail > echo.txt

# Validate the checksum (this should now fail)
RUN sha1sum -c sha1sums.txt

...

$ docker build -no-cache .
Warning: '-no-cache' is deprecated, it will be removed soon. See usage.
Uploading context  12.8 kB
Uploading context
Step 0 : FROM fedora
 ---> 58394af37342
Step 1 : RUN echo ThisIsATest > echo.txt
 ---> Running in cd158d4e6d91
 ---> 4088b1b4945f
Step 2 : RUN sha1sum echo.txt > sha1sums.txt
 ---> Running in 5d028d901d94
 ---> c97b1d31a720
Step 3 : RUN sha1sum -c sha1sums.txt
 ---> Running in 44d119897164
echo.txt: OK
 ---> ca01d590cadd
Step 4 : RUN echo ThisShouldFail > echo.txt
 ---> Running in 87b575ac4052
 ---> 36bb5d8cf6d1
Step 5 : RUN sha1sum -c sha1sums.txt
 ---> Running in e20b7ac0c924
echo.txt: FAILED
WARNING: 1 computed checksum did NOT match
2014/04/22 10:29:07 The command [/bin/sh -c sha1sum -c sha1sums.txt] returned a non-zero code: 1