Downloads the specified version of a Hashicorp program into your bin directory.

dh-hashicorp

#!/bin/bash -e

PROG=${1?-Program name is required}
VERSION=${2?-Program version is required}

os=$(uname -s | tr A-Z a-z)

# MacOS has a quirk with `arch`:
# https://apple.stackexchange.com/questions/140651/why-does-arch-output-i386
case "$(uname -m)" in
  "x86_64" | "amd64" )
    arch="amd64"
    ;;
  "arm" )
    arch="arm"
    ;;
  * )
    arch="i386"
    ;;
esac

zip="${PROG}_${VERSION}_${os}_${arch}.zip"
sha="${PROG}_${VERSION}_SHA256SUMS"
sig="${PROG}_${VERSION}_SHA256SUMS.sig"
url="https://releases.hashicorp.com/${PROG}/${VERSION}"

# Make a place for our work.
tempdir=$(mktemp -d)
cd $tempdir

# Download the binary and signature files.
curl -sO "${url}/${zip}"
curl -sO "${url}/${sha}"
curl -sO "${url}/${sig}"

# Verify the signature file is untampered.
gpg --verify "${sig}" "${sha}"

# Verify the SHASUM matches the zip.
grep "${os}_${arch}" "${sha}" | shasum -a 256 -c -

# Unzip the binary.
unzip -q "${zip}"

# Put the binary in to place.
mv -f "${PROG}" ~/bin

# Clean up.
rm -f "${zip}" "${sha}" "${sig}"
cd - >/dev/null
rmdir $tempdir

echo "Upgraded to ${PROG} v${VERSION}."