AWS SAM CLI installer/update script

awssamcli.sh

#!/bin/sh

AWSSAMCLI_DIST="awssamcli.zip"
LOCAL_BIN_DIR="${HOME}/.local/bin"
LOCAL_SHARE_DIR="${HOME}/.local/share/sam"

if [ -z "$(which curl)" ] || [ -z "$(which unzip)" ]; then
        echo "Please make sure curl and unzip are installed"
        exit 1
fi

TMP_DIR=$(mktemp -d)

echo "Fetching latest AWS SAM CLI release file"
curl -sL "https://github.com/aws/aws-sam-cli/releases/latest/download/aws-sam-cli-linux-x86_64.zip" -o "${TMP_DIR}/${AWSSAMCLI_DIST}"
echo "Unpacking AWS SAM CLI files"
unzip -q "${TMP_DIR}/${AWSSAMCLI_DIST}" -d "${TMP_DIR}"

if [ -z "$(which sam)" ]; then
        echo "Installing AWS SAM CLI to your home directory"
        "${TMP_DIR}"/install -b "${LOCAL_BIN_DIR}" -i "${LOCAL_SHARE_DIR}"
        echo 'Add ${HOME}/.local/bin to your PATH environment variable as needed to run "sam" directly'
else
        echo "Updating existing AWS SAM CLI installation"
        "${TMP_DIR}"/install -u -b "${LOCAL_BIN_DIR}" -i "${LOCAL_SHARE_DIR}"
fi

if [ "$(ls -1 ${LOCAL_SHARE_DIR} | wc -l)" -gt 5 ]; then
        # No auto-cleanup since that needs semver comparisons
        echo "You have 5 or more AWS SAM CLI versions in ${LOCAL_SHARE_DIR}, please consider cleaning older versions"
        echo "Currently occupying: $(du -sh ${LOCAL_SHARE_DIR} | cut -f1)"
fi

echo "Cleaning installation files from ${TMP_DIR}"
rm -rf "${TMP_DIR}"