rustget: a shell script to install rust and rust-analyzer, without the crazy.

rustget

#!/bin/bash
#
# The short shell script for you who wants an installer that does the job and stops.
# (And thus doesn't want anything to do with rustup.)
#

# Find the latest rust version numbers by looking at
#	https://forge.rust-lang.org/infra/other-installation-methods.html
# You'll need to give that number as an argument.

set -euo pipefail

VERSION=${1?"version number must be provided as arg 1"}
ARCHISH=${2:-"x86_64-unknown-linux-gnu"}

function progress {
	>&2 printf "\033[33m%s\033[m\n" "$@"
}

mkdir -p /tmp/rustget
cd /tmp/rustget

# Get the stuff.
mkdir -p rust-installer-archives
(cd rust-installer-archives
	progress "Downloading tarballs..."
	# This is the actual binaries that you want.
	[ -f "rust-${VERSION}-${ARCHISH}.tar.gz" ] || wget https://static.rust-lang.org/dist/rust-${VERSION}-${ARCHISH}.tar.gz
	# This contains the stdlib source (and a bunch of other stuff we don't need) which is needed by rust-analyzer to have a good day.
	[ -f "rustc-${VERSION}-src.tar.gz" ] || wget https://static.rust-lang.org/dist/rustc-${VERSION}-src.tar.gz
)

# Unpack most of the stuff.
mkdir -p rust-${VERSION}-${ARCHISH}
(cd rust-${VERSION}-${ARCHISH}
	progress "Extracting binaries..."
	# Extract the tarball.
	tar -xf ../rust-installer-archives/rust-${VERSION}-${ARCHISH}.tar.gz
	# The tarball contains a single directory that's very redundant, so let's do away with that.
	mv rust-${VERSION}-${ARCHISH}/* . ; rmdir rust-${VERSION}-${ARCHISH}/
	# Put all the files where they actually should be relative to each other.
	# Basically, move everything up one directory.  (This is so silly.  But this is how they package Rust.)
	progress "Rearranging files..."
	for x in */; do (cd $x && find -type d | xargs -I{} -- mkdir -p ../{} && find -type f,l | xargs -I{} mv {} ../{}) && rm -r $x; done
	# Make the directory that we're going to drop the stdlib source into, for rust-analyzer to find it.
	mkdir -p lib/rustlib/src/rust/
	progress "Main extraction and rearrangement done."
)

# Unpack the stdlib sources, put them in the right place, and throw away the rest.
mkdir -p sillysauce
(cd sillysauce
	progress "Extracting stdlib source..."
	# Extract this tarball that contains all the stdlib source... and all the rustc source, and all the test data, and a million other things we _don't need_.
	# Ask tar to extract just the library dir, which contains that stdlib source.
	tar -xf ../rust-installer-archives/rustc-${VERSION}-src.tar.gz rustc-${VERSION}-src/library/
	# Move it to the place rust-analyzer will expect it.
	progress "Rearranging stdlib source to where it's expected..."
	mv rustc-${VERSION}-src/library ../rust-${VERSION}-${ARCHISH}/lib/rustlib/src/rust/
	rmdir *
)
rmdir sillysauce

progress "Done!"
# Done!
# You can now add `rust-${VERSION}-${ARCHISH}/bin` to your $PATH, and it DTRT!
# You can keep or throw away the rust-installer-archives dir, as you wish.