Dockerfile build fails all of a sudden - linux

Question

I'm trying to resolve build problems when running commands to build below dockerfile,
errors for example I get:
1.
/bin/sh: 1: /opt/conda/bin/pip: not found
The command '/bin/sh -c wget -q https://repo.continuum.io/miniconda/Miniconda3-4.2.12-Linux-x86_64.sh -O /tmp/miniconda.sh && echo 'd0c7c71cc5659e54ab51f2005a8d96f3 */tmp/miniconda.sh' | md5sum -c - && bash /tmp/miniconda.sh -f -b -p /opt/conda && /opt/conda/bin/conda install --yes -c conda-forge python=3.5 sqlalchemy tornado jinja2 traitlets requests pip pycurl nodejs configurable-http-proxy && /opt/conda/bin/pip install --upgrade pip && rm /tmp/miniconda.sh' returned a non-zero code: 127
2.
When trying to comment the problematic part we get another issue with npm such as:
/bin/sh: 1: npm: not found
Any idea what's going on here?
Dockerfile
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
FROM debian:jessie
MAINTAINER Jupyter Project <jupyter#googlegroups.com>
# install nodejs, utf8 locale, set CDN because default httpredir is unreliable
ENV DEBIAN_FRONTEND noninteractive
RUN REPO=http://cdn-fastly.deb.debian.org && \
echo "deb $REPO/debian jessie main\ndeb $REPO/debian-security jessie/updates main" > /etc/apt/sources.list && \
apt-get -y update && \
apt-get -y upgrade && \
apt-get -y install wget locales git bzip2 &&\
/usr/sbin/update-locale LANG=C.UTF-8 && \
locale-gen C.UTF-8 && \
apt-get remove -y locales && \
apt-get clean && \
rm -rf /var/lib/apt/lists/*
ENV LANG C.UTF-8
# install Python + NodeJS with conda
RUN wget -q https://repo.continuum.io/miniconda/Miniconda3-4.2.12-Linux-x86_64.sh -O /tmp/miniconda.sh && \
echo 'd0c7c71cc5659e54ab51f2005a8d96f3 */tmp/miniconda.sh' | md5sum -c - && \
bash /tmp/miniconda.sh -f -b -p /opt/conda && \
/opt/conda/bin/conda install --yes -c conda-forge \
python=3.5 sqlalchemy tornado jinja2 traitlets requests pip pycurl \
nodejs configurable-http-proxy && \
/opt/conda/bin/pip install --upgrade pip && \
rm /tmp/miniconda.sh
ENV PATH=/opt/conda/bin:$PATH
EXPOSE 8000
RUN mkdir -p /src/jupyterhub
WORKDIR /src/jupyterhub
ADD . /src/jupyterhub
RUN npm install --unsafe-perm && \
pip install . && \
rm -rf $PWD ~/.cache ~/.npm
ADD . /src/jupyterhub
LABEL org.jupyter.service="jupyterhub"
CMD ["jupyterhub"]

Answer 1

The latest pip package hosted by conda forge is noarch/pip-20.0.2-py_2.tar.bz2 and it has the bin folder missing hence calling /opt/conda/bin/pip will give /opt/conda/bin/pip: not found error.
I would suggest enforcing the versions of the packages to prevent updated versions causing build error, this will achieve deterministic builds in different machines which saves time on having to figure out what version change is causing the error.
In order to get pip properly, amending the Dockerfile with the below should do the trick:
RUN wget -q https://repo.continuum.io/miniconda/Miniconda3-4.2.12-Linux-x86_64.sh -O /tmp/miniconda.sh && \
echo 'd0c7c71cc5659e54ab51f2005a8d96f3 */tmp/miniconda.sh' | md5sum -c - && \
bash /tmp/miniconda.sh -f -b -p /opt/conda && \
/opt/conda/bin/conda install --yes -c conda-forge \
python=3.5 sqlalchemy tornado jinja2 traitlets requests pip=18.0=py35_1001 pycurl \
nodejs configurable-http-proxy && \
/opt/conda/bin/pip install --upgrade pip && \
rm /tmp/miniconda.sh