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get-pants.sh
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get-pants.sh
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#!/usr/bin/env bash
# Copyright 2023 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
set -euo pipefail
COLOR_RED="\x1b[31m"
COLOR_GREEN="\x1b[32m"
COLOR_YELLOW="\x1b[33m"
COLOR_RESET="\x1b[0m"
function log() {
echo -e "$@" 1>&2
}
function die() {
(($# > 0)) && log "${COLOR_RED}$*${COLOR_RESET}"
exit 1
}
function green() {
(($# > 0)) && log "${COLOR_GREEN}$*${COLOR_RESET}"
}
function warn() {
(($# > 0)) && log "${COLOR_YELLOW}$*${COLOR_RESET}"
}
function check_cmd() {
local cmd="$1"
command -v "$cmd" > /dev/null || die "This script requires the ${cmd} binary to be on the PATH."
}
help_url="https://www.pantsbuild.org/docs/getting-help"
_GC=()
function gc() {
if (($# > 0)); then
check_cmd rm
_GC+=("$@")
else
rm -rf "${_GC[@]}"
fi
}
trap gc EXIT
check_cmd uname
function calculate_os() {
local os
os="$(uname -s)"
if [[ "${os}" =~ [Ll]inux ]]; then
echo linux
elif [[ "${os}" =~ [Dd]arwin ]]; then
echo macos
elif [[ "${os}" =~ [Ww]in|[Mm][Ii][Nn][Gg] ]]; then
# Powershell reports something like: Windows_NT
# Git bash reports something like: MINGW64_NT-10.0-22621
echo windows
else
die "Pants is not supported on this operating system (${os}). Please reach out to us at ${help_url} for help."
fi
}
OS="$(calculate_os)"
check_cmd basename
if [[ "${OS}" == "windows" ]]; then
check_cmd pwsh
else
check_cmd curl
fi
function fetch() {
local url="$1"
local dest_dir="$2"
local dest
dest="${dest_dir}/$(basename "${url}")"
if [[ "${OS}" == "windows" ]]; then
pwsh -c "Invoke-WebRequest -OutFile $dest -Uri $url"
else
curl --proto '=https' --tlsv1.2 -sSfL -o "${dest}" "${url}"
fi
}
if [[ "${OS}" == "macos" ]]; then
check_cmd shasum
else
check_cmd sha256sum
fi
function sha256() {
if [[ "${OS}" == "macos" ]]; then
shasum --algorithm 256 "$@"
else
sha256sum "$@"
fi
}
check_cmd mktemp
function install_from_url() {
local url="$1"
local dest="$2"
local workdir
workdir="$(mktemp -d)"
gc "${workdir}"
fetch "${url}.sha256" "${workdir}"
fetch "${url}" "${workdir}"
(
cd "${workdir}"
sha256 -c --status ./*.sha256 ||
die "Download from ${url} did not match the fingerprint at ${url}.sha256"
)
rm "${workdir}/"*.sha256
if [[ "${OS}" == "macos" ]]; then
mkdir -p "$(dirname "${dest}")"
install -m 755 "${workdir}/"* "${dest}"
else
install -D -m 755 "${workdir}/"* "${dest}"
fi
}
function calculate_arch() {
local arch
arch="$(uname -m)"
if [[ "${arch}" =~ x86[_-]64 ]]; then
echo x86_64
elif [[ "${arch}" =~ arm64|aarch64 ]]; then
echo aarch64
else
die "Pants is not supported for this chip architecture (${arch}). Please reach out to us at ${help_url} for help."
fi
}
check_cmd cat
function usage() {
cat << EOF
Usage: $0
Installs the pants launcher binary.
You only need to run this once on a machine when you do not have "pants"
available to run yet.
The pants binary takes care of managing and running the underlying
Pants version configured in "pants.toml" in the surrounding Pants-using
project.
Once installed, if you want to update your "pants" launcher binary, use
"SCIE_BOOT=update pants" to get the latest release or
"SCIE_BOOT=update pants --help" to learn more options.
-h | --help: Print this help message.
-d | --bin-dir:
The directory to install the scie-pants binary in, "~/bin" by default.
-b | --base-name:
The name to use for the scie-pants binary, "pants" by default.
-V | --version:
The version of the scie-pants binary to install, the latest version by default.
The available versions can be seen at:
https://github.com/pantsbuild/scie-pants/releases
EOF
}
bin_dir="${HOME}/bin"
base_name="pants"
version="latest/download"
while (($# > 0)); do
case "$1" in
--help | -h)
usage
exit 0
;;
--bin-dir | -d)
bin_dir="$2"
shift
;;
--base-name | -b)
base_name="$2"
shift
;;
--version | -V)
version="download/v$2"
shift
;;
*)
usage
die "Unexpected argument $1\n"
;;
esac
shift
done
ARCH="$(calculate_arch)"
URL="https://github.com/pantsbuild/scie-pants/releases/${version}/scie-pants-${OS}-${ARCH}"
dest="${bin_dir}/${base_name}"
log "Downloading and installing the pants launcher ..."
install_from_url "${URL}" "${dest}"
green "Installed the pants launcher from ${URL} to ${dest}"
if ! command -v "${base_name}" > /dev/null; then
warn "${dest} is not on the PATH."
log "You'll either need to invoke ${dest} explicitly or else add ${bin_dir} to your shell's PATH."
fi
green "\nRunning \`pants\` in a Pants-enabled repo will use the version of Pants configured for that repo."
green "In a repo not yet Pants-enabled, it will prompt you to set up Pants for that repo."