chore: add install script

scripts/install.sh

@@ -0,0 +1,143 @@
+#!/bin/sh
+#
+# Licensed under the MIT license
+# <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+# Example to bypass binary overwrite [y/N] prompt
+# curl -sSL https://raw.githubusercontent.com/adikari/safebox/main/scripts/install.sh | sh
+
+set -u
+
+BINARY_DOWNLOAD_PREFIX="https://github.com/adikari/safebox/releases/download"
+
+PACKAGE_VERSION="1.0.1"
+
+download_binary_and_run_installer() {
+    downloader --check
+    need_cmd mktemp
+    need_cmd chmod
+    need_cmd mkdir
+    need_cmd rm
+    need_cmd rmdir
+    need_cmd tar
+    need_cmd which
+    need_cmd dirname
+    need_cmd awk
+    need_cmd cut
+
+    get_architecture || return 1
+    local _arch="$RETVAL"
+    assert_nz "$_arch" "arch"
+
+    local _ext=""
+    case "$_arch" in
+        *windows*)
+            _ext=".exe"
+            ;;
+    esac
+
+		local _current_dir=$(pwd)
+    local _tardir="safebox_$PACKAGE_VERSION"_"${_arch}"
+    local _url="$BINARY_DOWNLOAD_PREFIX/v$PACKAGE_VERSION/${_tardir}.tar.gz"
+    local _dir="$(mktemp -d 2>/dev/null || ensure mktemp -d -t test)"
+    local _file="$_dir/input.tar.gz"
+    local _safebox="$_dir/safebox$_ext"
+		local _bin_dir="/usr/local/bin"
+
+		cd $_dir
+    say "downloading safebox from $_url" 1>&2
+
+    ensure mkdir -p "$_dir"
+    downloader "$_url" "$_file"
+    if [ $? != 0 ]; then
+      say "failed to download $_url"
+      exit 1
+    fi
+
+    ensure tar xf "$_file"
+		sudo mv "$_safebox" "$_bin_dir"
+    local _retval=$?
+
+    ignore rm -rf "$_dir"
+
+		cd $_current_dir
+    return "$_retval"
+}
+
+get_architecture() {
+    local _ostype="$(uname -s)"
+    local _cputype="$(uname -m)"
+
+    RETVAL="$_ostype"_"$_cputype"
+}
+
+say() {
+    local green=`tput setaf 2 2>/dev/null || echo ''`
+    local reset=`tput sgr0 2>/dev/null || echo ''`
+    echo "$1"
+}
+
+err() {
+    local red=`tput setaf 1 2>/dev/null || echo ''`
+    local reset=`tput sgr0 2>/dev/null || echo ''`
+    say "${red}ERROR${reset}: $1" >&2
+    exit 1
+}
+
+need_cmd() {
+    if ! check_cmd "$1"
+    then err "need '$1' (command not found)"
+    fi
+}
+
+check_cmd() {
+    command -v "$1" > /dev/null 2>&1
+    return $?
+}
+
+need_ok() {
+    if [ $? != 0 ]; then err "$1"; fi
+}
+
+assert_nz() {
+    if [ -z "$1" ]; then err "assert_nz $2"; fi
+}
+
+# Run a command that should never fail. If the command fails execution
+# will immediately terminate with an error showing the failing
+# command.
+ensure() {
+    "$@"
+    need_ok "command failed: $*"
+}
+
+# This is just for indicating that commands' results are being
+# intentionally ignored. Usually, because it's being executed
+# as part of error handling.
+ignore() {
+    "$@"
+}
+
+# This wraps curl or wget. Try curl first, if not installed,
+# use wget instead.
+downloader() {
+    if check_cmd curl
+    then _dld=curl
+    elif check_cmd wget
+    then _dld=wget
+    else _dld='curl or wget' # to be used in error message of need_cmd
+    fi
+
+    if [ "$1" = --check ]
+    then need_cmd "$_dld"
+    elif [ "$_dld" = curl ]
+    then curl -sSfL "$1" -o "$2"
+    elif [ "$_dld" = wget ]
+    then wget "$1" -O "$2"
+    else err "Unknown downloader"   # should not reach here
+    fi
+}
+
+download_binary_and_run_installer "$@" || exit 1