Fix Dockerfile build (#303)

* Fix Dockerfile build

The Docker build used a 2-step installation of requirements
and application.
This was broken by #272.

Fixes #300

* Add dependencies cache for docker build

Caching installation requirements saves time when building

.dockerignore

@@ -0,0 +1,4 @@
+*.png
+tests/
+docs/
+.github/

.gitignore

@@ -1,6 +1,5 @@
 *.pyc
 .venv
-.dockerignore
 *aqua*
 venv/
 .vscode

Dockerfile

@@ -1,25 +1,19 @@
-FROM python:3.7-alpine3.10 as builder
+FROM python:3.8-alpine as builder
 
 RUN apk add --no-cache \
     linux-headers \
     tcpdump \
     build-base \
-    ebtables
+    ebtables \
+    make \
+    git && \
+    apk upgrade --no-cache
 
 WORKDIR /kube-hunter
-COPY ./requirements.txt /kube-hunter/.
-RUN pip install -r /kube-hunter/requirements.txt -t /kube-hunter
+COPY setup.py setup.cfg Makefile ./
+RUN make deps
 
-COPY . /kube-hunter
+COPY . .
+RUN make install
 
-FROM python:3.7-alpine3.10
-
-RUN apk add --no-cache \
-    tcpdump
-RUN apk upgrade --no-cache 
-
-COPY --from=builder /kube-hunter /kube-hunter
-
-WORKDIR /kube-hunter
-
-ENTRYPOINT ["python",  "kube-hunter.py"]
+ENTRYPOINT ["kube-hunter"]

Makefile

@@ -1,4 +1,4 @@
-.SILENT:
+.SILENT: clean
 
 NAME            := kube-hunter
 SRC             := kube_hunter
@@ -10,6 +10,13 @@ STATIC_COMPILED := $(COMPILED).static
 
 .PHONY: deps
 deps:
+	requires=$(shell mktemp)
+	python setup.py -q dependencies > \$requires
+	pip install -r \$requires
+	rm \$requires
+
+.PHONY: dev-deps
+dev-deps:
 	pip install -r requirements-dev.txt
 
 .PHONY: lint

setup.py

@@ -4,6 +4,25 @@
 from setuptools import setup, Command
 
 
+class ListDependenciesCommand(Command):
+    """A custom command to list dependencies"""
+
+    description = "list package dependencies"
+    user_options = []
+
+    def initialize_options(self):
+        pass
+
+    def finalize_options(self):
+        pass
+
+    def run(self):
+        cfg = ConfigParser()
+        cfg.read("setup.cfg")
+        requirements = cfg["options"]["install_requires"]
+        print(requirements)
+
+
 class PyInstallerCommand(Command):
     """A custom command to run PyInstaller to build standalone executable."""
 
@@ -36,6 +55,11 @@ def run(self):
 
 
 setup(
-    use_scm_version=True,
-    cmdclass={"pyinstaller": PyInstallerCommand},
+    use_scm_version={
+        "fallback_version": "noversion"
+    },
+    cmdclass={
+        "dependencies": ListDependenciesCommand,
+        "pyinstaller": PyInstallerCommand,
+    },
 )