Convert curl|bash to an rpm with Docker and FPM

1-output.txt

% docker build -t rust . 
...

# Export the image to tarball, which itself contains tarballs and a manifest.json
% docker save -o rust.tar rust 

# Extract the last layer
# tar's -O flag extracts a single entry from the tarball.
# The file we want is the last "Layer" in the manifest.json
% tar -xf rust.tar -O $(tar -xf rust.tar -O manifest.json | jq -r '.[].Layers[-1]') > curlbash.tar

# Use fpm to convert it to an rpm
% fpm -s tar -t rpm -n rustup -C /home/builder/.rustup --prefix /usr/local/share curlbash.tar
Created package {:path=>"rustup-1.0-1.x86_64.rpm"}

# Check the rpm for joyful files.
% rpm -qp rustup-1.0-1.x86_64.rpm -l | less | grep bin/
/usr/local/share/toolchains/stable-x86_64-unknown-linux-gnu/bin/cargo
/usr/local/share/toolchains/stable-x86_64-unknown-linux-gnu/bin/rust-gdb
/usr/local/share/toolchains/stable-x86_64-unknown-linux-gnu/bin/rust-lldb
/usr/local/share/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc
/usr/local/share/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustdoc

% sudo rpm -i rustup-1.0-1.x86_64.rpm
% /usr/local/share/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc -h
Usage: rustc [OPTIONS] INPUT

Options:
    -h, --help          Display this message
...

% sudo rpm -e rustup

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Dockerfile

from centos:7

RUN useradd builder

USER builder

# curl | sh, but also delete rust docs to make this demo shorter.
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y; \
    rm -r ~/.rustup/toolchains/*/share/doc/