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Add Wolfi/Chainguard dev image compatibility to installer script #151

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Add Wolfi/Chainguard dev image compatibility to installer script #151

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33 changes: 30 additions & 3 deletions get-pants.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -71,7 +71,15 @@ check_cmd basename
if [[ "${OS}" == "windows" ]]; then
check_cmd pwsh
else
check_cmd curl
# Detect whether curl or wget is available
FETCH_CMD=""
if command -v curl > /dev/null; then
FETCH_CMD="curl"
elif command -v wget > /dev/null; then
FETCH_CMD="wget"
else
die "This script requires either curl or wget to be installed."
fi
fi

function fetch() {
Expand All @@ -83,8 +91,10 @@ function fetch() {

if [[ "${OS}" == "windows" ]]; then
pwsh -c "Invoke-WebRequest -OutFile $dest -Uri $url"
else
elif [[ "${FETCH_CMD}" == "curl" ]]; then
curl --proto '=https' --tlsv1.2 -sSfL -o "${dest}" "${url}"
elif [[ "${FETCH_CMD}" == "wget" ]]; then
wget --https-only --secure-protocol=TLSv1_2 -q -O "${dest}" "${url}"
fi
}

Expand All @@ -102,6 +112,23 @@ function sha256() {
fi
}

# Determine which silent/status flag sha256sum supports
# GNU coreutils uses --status, BusyBox uses -s
SHA256_STATUS_FLAG=""
function detect_sha256_status_flag() {
if [[ "${OS}" != "macos" ]]; then
# Test for --status (GNU coreutils)
if echo "test" | sha256sum --status -c - 2>/dev/null; then
SHA256_STATUS_FLAG="--status"
# Test for -s (BusyBox)
elif echo "test" | sha256sum -s -c - 2>/dev/null; then
SHA256_STATUS_FLAG="-s"
fi
fi
}

detect_sha256_status_flag

check_cmd mktemp

function install_from_url() {
Expand All @@ -116,7 +143,7 @@ function install_from_url() {
fetch "${url}" "${workdir}"
(
cd "${workdir}"
sha256 -c --status ./*.sha256 ||
sha256 -c ${SHA256_STATUS_FLAG} ./*.sha256 ||
die "Download from ${url} did not match the fingerprint at ${url}.sha256"
)
rm "${workdir}/"*.sha256
Expand Down