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Could not find gem 'embulk (>= 0.9.15)'

See original GitHub issue

Context

Hi, I’m a newbie embulk plugin developper and I haven’t created before. I’ve just followed the doc and “Next steps” output:

https://www.embulk.org/docs/customization.html

I confirmed removing version constraint for embulk fixes this problem but I’m not sure about compatibility.

Issue Type: Bug Report

Write the following environmental information.
- Docker for Mac Version 2.0.0.3 (31259)
- Java version

openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-2~deb9u1-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)

Embulk version embulk 0.9.15
Steps to reproduce

Write a Dockerfile

FROM ruby:2.6

RUN apt-get update && apt-get install -y git default-jdk

RUN curl --create-dirs -o /usr/local/bin/embulk -L "https://dl.embulk.org/embulk-latest.jar"
RUN chmod +x /usr/local/bin/embulk

RUN useradd --create-home --user-group --uid 1000 app && mkdir /app /vendor && chown app:app /app /vendor

USER app

WORKDIR /app

Run the following commands:

docker build . -t embulk-test
docker run embulk-test bash -c 'embulk new ruby-input xxx && cd embulk-input-xxx && bundle install'

Expected behavior

bundle install is successfully finished

Actual behavior

2019-02-21 16:53:34.894 +0000: Embulk v0.9.15
Creating embulk-input-xxx/

Plugin template is successfully generated.
Next steps:

  $ cd embulk-input-xxx
  $ bundle install                      # install one using rbenv & rbenv-build
  $ bundle exec rake                    # build gem to be released
  $ bundle exec embulk run config.yml   # you can run plugin using this command

fatal: Not a git repository (or any of the parent directories): .git
Fetching gem metadata from https://rubygems.org/..............
Fetching gem metadata from https://rubygems.org/.
Could not find gem 'embulk (>= 0.9.15)' in any of the gem sources listed in your
Gemfile.