zulip/tools/setup/install-shellcheck

#!/usr/bin/env bash
set -eu

version=0.9.0
arch="$(uname -m)"
tarball="shellcheck-v$version.linux.$arch.tar.xz"
declare -A sha256=(
    [aarch64]=179c579ef3481317d130adebede74a34dbbc2df961a70916dd4039ebf0735fae
    [x86_64]=700324c6dd0ebea0117591c6cc9d7350d9c7c5c287acbad7630fa17b1d4d9e2f
)

check_version() {
    out="$(shellcheck --version)" && [[ "$out" = *"
version: $version
"* ]]
}

if ! check_version 2>/dev/null; then
    set -x
    tmpdir="$(mktemp -d)"
    trap 'rm -r "$tmpdir"' EXIT
    cd "$tmpdir"
    curl -fLO --retry 3 "https://github.com/koalaman/shellcheck/releases/download/v$version/$tarball"
    sha256sum -c <<<"${sha256[$arch]} $tarball"
    tar -xJf "$tarball" --no-same-owner --strip-components=1 -C /usr/local/bin "shellcheck-v$version/shellcheck"
    check_version
fi