chore: add dockerfile (#183)

.dockerignore

@@ -0,0 +1,3 @@
+*
+!.dockerignore
+!Dockerfile

Dockerfile

@@ -0,0 +1,47 @@
+FROM ubuntu:18.04
+
+ARG PRE_COMMIT_VERSION="2.11.1"
+ARG GOLANG_VERSION="1.16"
+ARG TERRAFORM_VERSION="0.14.8"
+ARG TFSEC_VERSION="v0.39.6"
+ARG TERRAFORM_DOCS_VERSION="latest"
+ARG TFLINT_VERSION="latest"
+ARG TFSEC_VERSION="v0.39.6"
+ARG CHECKOV_VERSION="1.0.838"
+
+# Install general dependencies
+RUN apt update && \
+    apt install -y curl git gawk unzip software-properties-common
+
+# Install golang
+RUN curl -L https://dl.google.com/go/go${GOLANG_VERSION}.linux-amd64.tar.gz > go${GOLANG_VERSION}.linux-amd64.tar.gz && \
+    tar xzf go${GOLANG_VERSION}.linux-amd64.tar.gz && \
+    rm -f go${GOLANG_VERSION}.linux-amd64.tar.gz
+ENV GOPATH /go
+RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
+ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
+
+# Install tools
+RUN add-apt-repository ppa:deadsnakes/ppa && \
+    apt install -y python3.7 python3-pip && \
+    pip3 install pre-commit==${PRE_COMMIT_VERSION} && \
+    curl -L "$(curl -s https://api.github.com/repos/terraform-docs/terraform-docs/releases/${TERRAFORM_DOCS_VERSION} | grep -o -E "https://.+?-linux-amd64.tar.gz")" > terraform-docs.tgz && tar xzf terraform-docs.tgz && chmod +x terraform-docs && mv terraform-docs /usr/bin/ && \
+    curl -L "$(curl -s https://api.github.com/repos/terraform-linters/tflint/releases/${TFLINT_VERSION} | grep -o -E "https://.+?_linux_amd64.zip")" > tflint.zip && unzip tflint.zip && rm tflint.zip && mv tflint /usr/bin/ && \
+    python3.7 -m pip install -U checkov==${CHECKOV_VERSION}
+RUN env GO111MODULE=on go get -u github.com/tfsec/tfsec/cmd/tfsec@${TFSEC_VERSION}
+
+# Install terraform because pre-commit needs it
+RUN curl -fsSL https://apt.releases.hashicorp.com/gpg | apt-key add - && \
+    apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main" && \
+    apt-get update && apt-get install terraform=${TERRAFORM_VERSION}
+
+# Checking all binaries are in the PATH
+RUN go version
+RUN terraform --help
+RUN pre-commit --help
+RUN terraform-docs --help
+RUN tflint --help
+RUN tfsec --help
+RUN checkov --help
+
+ENTRYPOINT [ "pre-commit" ]

README.md

@@ -13,6 +13,8 @@
 * [`coreutils`](https://formulae.brew.sh/formula/coreutils) required for `terraform_validate` hook on macOS (due to use of `realpath`).
 * [`checkov`](https://github.com/bridgecrewio/checkov) required for `checkov` hook.
 
+or build and use the Docker image locally as mentioned below in the `Run` section.
+
 ##### MacOS
 
 ```bash
@@ -34,6 +36,7 @@ python3.7 -m pip install -U checkovpython3.7 -m pip install -U checkov
 ```
 
 ### 2. Install the pre-commit hook globally
+Note: not needed if you use the Docker image
 
 ```bash
 DIR=~/.git-template
@@ -65,6 +68,15 @@ After pre-commit hook has been installed you can run it manually on all files in
 pre-commit run -a
 ```
 
+or you can also build and use the provided Docker container, which wraps all dependencies by
+```bash
+# first building it
+docker build -t pre-commit .
+# and then running it in the folder 
+# with the terraform code you want to check by executing
+docker run -v $(pwd):/lint -w /lint pre-commit run -a 
+```
+
 ## Available Hooks
 
 There are several [pre-commit](https://pre-commit.com/) hooks to keep Terraform configurations (both `*.tf` and `*.tfvars`) and Terragrunt configurations (`*.hcl`) in a good shape: