install-cmake

#!/bin/sh

set -e

# Install a recent binary release of cmake.
# Kitware produces a self-installing tarball.

if [ "$(uname)" != Linux ]; then
    >&2 echo "This installer requires Linux, but instead you're running $(uname)."
    exit 1
fi

VERSION=3.24.2
REPO=$(dirname "$0")/..

# If a suitably recent version of cmake is already installed, then don't bother.
if >/dev/null command -v cmake && >/dev/null 2>&1 cmake -P "$REPO/CheckRequiredCMakeVersion.cmake"; then
    echo 'A suitable version of cmake is already installed.'
    exit
fi

for required in wget sed; do
    if ! >/dev/null command -v "$required"; then
        >&2 echo "This installer requires $required."
        exit 2
    fi
done

ARCHITECTURE=$(uname -m)
INSTALLER=cmake-${VERSION}-linux-${ARCHITECTURE}.sh
URL=https://github.com/Kitware/CMake/releases/download/v${VERSION}/${INSTALLER}

maybe_sudo() {
    if [ "$(id -u)" -eq 0 ]; then
        "$@"
    else
        sudo "$@"
    fi
}

cd /tmp
if ! wget "${URL}"; then
    >&2 echo "wget failed to download \"${URL}\"."
    exit 3
fi
chmod +x "${INSTALLER}"
maybe_sudo ./"${INSTALLER}" --skip-license --prefix=/usr/local --exclude-subdir
rm "${INSTALLER}"