Add cmake.sh

cmake.sh

+set -ex
+
+main() {
+    local version=$1
+
+    local dependencies=(
+        curl
+        g++
+        make
+    )
+
+    apt-get update
+    local purge_list=()
+    for dep in ${dependencies[@]}; do
+        if ! dpkg -L $dep; then
+            apt-get install --no-install-recommends -y $dep
+            purge_list+=( $dep )
+        fi
+    done
+
+    local td=$(mktemp -d)
+
+    pushd $td
+
+    curl https://cmake.org/files/v${version%.*}/cmake-$version.tar.gz | \
+        tar --strip-components 1 -xz
+    ./bootstrap
+    nice make -j$(nproc)
+    make install
+
+    # clean up
+    popd
+
+    apt-get purge --auto-remove -y ${purge_list[@]}
+
+    rm -rf $td
+    rm $0
+}
+
+main "${@}"