A utility to help you figure out which package you need to install in order to get your Dockerfile to build.
The current set of limitations should at least make this a useful exploratory tool for APT based distributions.
- Shell is currently hard coded to "/bin/sh -c" (the default docker SHELL directive)
- The RUN directive has not been stress tested against weird syntax
- For now the failing RUN directive needs to be able to run apt-get commands (by default running as USER root)
- For now it works with Dockerfile which do not need a context (self containing)
- The image will be running with the following options to allow strace to run: "--cap-add=SYS_PTRACE --pid=host"
- Currently it only checks /etc/apt/sources.list (not sources.d)
- Python 2.7 or 3
- Docker runtime that can build and run the image
- Linux APT based Dockerfile (such as debian, ubuntu)
- tar
Let's take the following simple Dockerfile, and try to make it work:
FROM debian:stretch-slim
RUN python -c "import numpy; print(numpy.version.version)"Trying to docker build will fail because the basic image does not have nor python nor numpy. So let's run:
python resolve.py Dockerfile build_tmpAnd it tells out we need to install python-minimal, So let's modify the Dockerfile:
FROM debian:stretch-slim
RUN apt-get update && apt-get install -y python-minimal
RUN python -c "import numpy; print(numpy.version.version)"Now building fails, because it does not know what numpy is yet:
python resolve.py Dockerfile build_tmpTells us to now install python-numpy package (since python access the path by directory and not by file, it also gives us a false positive we can ignore, python-numpy-dbg):
python resolve.py Dockerfile build_tmpAnd thus here is the final working Dockerfile:
FROM debian:stretch-slim
RUN apt-get update && apt-get install -y python-minimal python-numpy
RUN python -c "import numpy; print(numpy.version.version)"