gistfile1.txt

FROM ruby:2.3.3

RUN apt-get update
RUN apt-get install -y nodejs
RUN gem install sinatra --no-rdoc --no-ri

COPY ["Gemfile", "/Gemfile"]
COPY ["lint.sh", "/lint.sh"]
COPY ["lint.rb", "/lint.rb"]
COPY ["unit.rb", "/unit.rb"]

ENTRYPOINT ["/bin/bash /lint.sh"]
EXPOSE 4000

gistfile2.txt

 sk_@sk-s-Air  sinatra-linter  $ docker build -t lint .
Sending build context to Docker daemon 71.82 MB
Step 1 : FROM ruby:2.3.3
 ---> 0e1db669d557
Step 2 : RUN apt-get update
 ---> Using cache
 ---> 3c75f6d5586c
Step 3 : RUN apt-get install -y nodejs
 ---> Using cache
 ---> 864059a3b318
Step 4 : RUN gem install sinatra --no-rdoc --no-ri
 ---> Using cache
 ---> c37a71c0b05c
Step 5 : COPY Gemfile /Gemfile
 ---> Using cache
 ---> 9bafcdce2f58
Step 6 : COPY lint.sh /lint.sh
 ---> Using cache
 ---> 1c7afee21d2f
Step 7 : COPY lint.rb /lint.rb
 ---> Using cache
 ---> e25b025cfcb5
Step 8 : COPY unit.rb /unit.rb
 ---> Using cache
 ---> a6d3c4396128
Step 9 : ENTRYPOINT /bin/bash /lint.sh
 ---> Running in 5a25157d3a6a
 ---> 9fe2f2d5a31f
Removing intermediate container 5a25157d3a6a
Step 10 : EXPOSE 4000
 ---> Running in bfedb1e5d676
 ---> 133ca48db946
Removing intermediate container bfedb1e5d676
Successfully built 133ca48db946
 sk_@sk-s-Air  sinatra-linter  $ docker run lint
docker: Error response from daemon: invalid header field value "oci runtime error: container_linux.go:247: starting container process caused \"exec: \\\"/bin/bash /lint.sh\\\": stat /bin/bash /lint.sh: no such file or directory\"\n".