Unable to install Ruby 2.6.x on Alpine Linux

[benlancaster]

Consider the following Dockerfile:

FROM alpine:latest

RUN apk --no-cache add \
    make \
    build-base \
    linux-headers \
    readline-dev \
    openssl-dev \
    yaml-dev \
    zlib-dev \
    curl \
    bash \
    git

# Set up Ruby
ENV HOME /root
ENV PATH $HOME/.rbenv/shims:$HOME/.rbenv/bin:$HOME/.rbenv/plugins/ruby-build/bin:$PATH
RUN curl -fsSL https://github.com/rbenv/rbenv-installer/raw/main/bin/rbenv-installer | bash
RUN rbenv install 2.6.6

Which yields the following failure:

rbenv/rbenv#7 [4/9] RUN rbenv install 2.6.6
rbenv/rbenv#7 sha256:7364b1ef28f24f37b459a6c21729ed4d88b725286f8090342d1c19f2c8981c77
rbenv/rbenv#7 0.364 Downloading ruby-2.6.6.tar.bz2...
rbenv/rbenv#7 0.365 -> https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.6.tar.bz2
rbenv/rbenv#7 14.45 Installing ruby-2.6.6...
rbenv/rbenv#7 234.0 
rbenv/rbenv#7 234.0 BUILD FAILED (Alpine Linux 3.14.2 using ruby-build 20211019)
rbenv/rbenv#7 234.1 
rbenv/rbenv#7 234.1 Inspect or clean up the working tree at /tmp/ruby-build.20211101115736.16.aoAbJF
rbenv/rbenv#7 234.1 Results logged to /tmp/ruby-build.20211101115736.16.log
rbenv/rbenv#7 234.1 
rbenv/rbenv#7 234.1 Last 10 log lines:
rbenv/rbenv#7 234.1                                     net-telnet 0.2.0
rbenv/rbenv#7 234.1 installing rdoc:                    /root/.rbenv/versions/2.6.6/share/ri/2.6.0/system
rbenv/rbenv#7 234.1 installing html-docs:               /root/.rbenv/versions/2.6.6/share/doc/ruby
rbenv/rbenv#7 234.1 installing capi-docs:               /root/.rbenv/versions/2.6.6/share/doc/ruby
rbenv/rbenv#7 234.1 /root/.rbenv/versions/2.6.6/lib/ruby/2.6.0/yaml.rb:12:in `<top (required)>': uninitialized constant Psych (NameError)
rbenv/rbenv#7 234.1 	from /root/.rbenv/versions/2.6.6/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
rbenv/rbenv#7 234.1 	from /root/.rbenv/versions/2.6.6/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
rbenv/rbenv#7 234.1 	from -e:15:in `block in <main>'
rbenv/rbenv#7 234.1 	from -e:13:in `reject'
rbenv/rbenv#7 234.1 	from -e:13:in `<main>'
rbenv/rbenv#7 ERROR: executor failed running [/bin/sh -c rbenv install 2.6.6]: exit code: 1
------
 > [4/9] RUN rbenv install 2.6.6:
------
executor failed running [/bin/sh -c rbenv install 2.6.6]: exit code: 1

[benlancaster]

I have tested Ruby versions 2.6.6 to 2.6.8 and got the failure above. For version 2.7.0 to 2.7.4 I see a different failure:

.rbenv/versions/2.7.4/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:12:in `<module:Kernel>': uninitialized constant Kernel::Monitor (NameError)
        from /home/jenkins/.rbenv/versions/2.7.4/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:10:in `<top (required)>'
        from /home/jenkins/.rbenv/versions/2.7.4/lib/ruby/2.7.0/rubygems.rb:1444:in `require'
        from /home/jenkins/.rbenv/versions/2.7.4/lib/ruby/2.7.0/rubygems.rb:1444:in `<top (required)>'
        from <internal:gem_prelude>:1:in `require'
        from <internal:gem_prelude>:1:in `<internal:gem_prelude>'

[johnhamelink]

We're also experiencing this:

• Ruby 2.7.4 built via asdf
• Alpine Glibc is the basis of the Docker container
• The host is OSX 12.1 Monterey

Everything works nicely if the host is running Linux.

FROM frolvlad/alpine-glibc:latest

RUN -- apk add bash curl git musl-locales \
    	   automake libffi yaml openssl-dev \
	   zlib-dev gcc g++ make

RUN -- adduser \
         --shell /bin/bash \
	 --home /ci \
	 --disabled-password \
	 ci

ENV PATH="${PATH}:/ci/.asdf/shims:/ci/.asdf/bin"

USER ci
WORKDIR /ci

RUN -- git clone --no-tags --single-branch --depth=1 \
       https://github.com/asdf-vm/asdf.git ${HOME}/.asdf && \
       echo -e '\nsource ${HOME}/.asdf/asdf.sh' >> ${HOME}/.bashrc && \
       echo -e '\nsource ${HOME}/.asdf/asdf.sh' >> ${HOME}/.profile

WORKDIR /app

# Install the asdf plugins we need
RUN -- asdf plugin add ruby https://github.com/asdf-vm/asdf-ruby.git && \
# Install bundler automatically
       echo -e '\nbundler' >> ${HOME}/.default-gems

RUN echo 'ruby 2.7.4' > ${HOME}/.tool-versions
RUN asdf install ruby

Edit: I was also able to produce the same outcomes when I use the latest alpine image with the gcompat package installed:

FROM alpine:latest

RUN -- apk add bash curl git musl-locales \
    	  automake libffi yaml openssl-dev \
	  zlib-dev gcc g++ make gcompat

RUN -- adduser \
         --shell /bin/bash \
	--home /ci \
	--disabled-password \
	ci

ENV PATH="${PATH}:/ci/.asdf/shims:/ci/.asdf/bin"

USER ci
WORKDIR /ci

RUN -- git clone --no-tags --single-branch --depth=1 \
       https://github.com/asdf-vm/asdf.git ${HOME}/.asdf && \
       echo -e '\nsource ${HOME}/.asdf/asdf.sh' >> ${HOME}/.bashrc && \
       echo -e '\nsource ${HOME}/.asdf/asdf.sh' >> ${HOME}/.profile

WORKDIR /app

# Install the asdf plugins we need
RUN -- asdf plugin add ruby https://github.com/asdf-vm/asdf-ruby.git && \
# Install bundler automatically
       echo -e '\nbundler' >> ${HOME}/.default-gems

RUN echo 'ruby 2.7.4' > ${HOME}/.tool-versions
RUN asdf install ruby

Output:

/ci/.asdf/installs/ruby/2.7.4/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:12:in `<module:Kernel>': uninitialized constant Kernel::Monitor (NameError)
	from /ci/.asdf/installs/ruby/2.7.4/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:10:in `<top (required)>'
	from /ci/.asdf/installs/ruby/2.7.4/lib/ruby/2.7.0/rubygems.rb:1444:in `require'
	from /ci/.asdf/installs/ruby/2.7.4/lib/ruby/2.7.0/rubygems.rb:1444:in `<top (required)>'
	from <internal:gem_prelude>:1:in `require'
	from <internal:gem_prelude>:1:in `<internal:gem_prelude>