#!/bin/bash
#
# Download Go, verify its signature, and if that all succeeds, move the tarball
# to go.tar.gz in the current directory.

set -eu

if [ $# -eq 0 ]; then
  echo "usage: $0 <go version> [platform like linux-amd64]"
  exit 1
fi
VERSION="${1}"
PLATFORM="${2:-linux-amd64}"

export GNUPGHOME="$(mktemp -d)"

# Import Google's published Linux package signing key bundle.
# Source: https://dl.google.com/linux/linux_signing_key.pub
#
# You may occasionally need to update the pinned key bundle below. To verify
# "old block vs new block" is only a subkey update:
# 1) Make an isolated keyring: `export GNUPGHOME="$(mktemp -d)"`.
# 2) Save this embedded key block into a file named `old`
# 3) Run `gpg --show-keys --with-fingerprint old` and note the
#    fingerprint under `pub`.
# 4) `curl -fsSL https://dl.google.com/linux/linux_signing_key.pub -o new`,
#    then `gpg --show-keys --with-fingerprint --with-subkey-fingerprint new`.
#    Confirm the same `pub` fingerprint.
# 5) Import the old keyblock with `gpg --import old`.
# 6) `gpg --import new` and expect only new subkeys to be added.
# 7) With this confirmed, update the embedded key block with the contents
#    of `new`.
gpg2 --import <<EOF
-----BEGIN PGP PUBLIC KEY BLOCK-----

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=4eJy
-----END PGP PUBLIC KEY BLOCK-----
EOF


OUTPUT_DIR="$(mktemp -d)"
FILENAME="go${VERSION}.${PLATFORM}.tar.gz"
OUTPUT_FILE="${OUTPUT_DIR}/${FILENAME}"
curl -fsSL "https://dl.google.com/go/${FILENAME}.asc" -o "${OUTPUT_FILE}.asc"
curl -fsSL "https://dl.google.com/go/${FILENAME}" -o "${OUTPUT_FILE}"

gpg2 --verify --trust-model=always "${OUTPUT_FILE}.asc" "${OUTPUT_FILE}"

mv "${OUTPUT_FILE}" go.tar.gz

rm -r "${OUTPUT_DIR}"
rm -r "${GNUPGHOME}"
