The quickbuild.sh script now checks the availability of the installat…

…ion directory, specification is mandatory. Also checks prerequisite tools: make, cmake. Updated README.md accordingly.

README.md

@@ -25,9 +25,8 @@ and the Boost libraries (1.44 or above) to build Multovl.
 Run the `quickbuild.sh` script in the top-level Multovl directory.
 This will compile the package using static linkage, assuming a Linux
 platform, Boost libraries installed in the usual system location.
-The Multovl installation goes under `/usr/local`. You can pass the 
-installation prefix by providing a path as a command line argument.
-E.g. `quickbuild.sh $HOME/foo/bar` will install Multovl executables into
+You have to specify the installation prefix by providing a path as a command line argument.
+E.g. `quickbuild.sh $HOME/foo/bar` will install the Multovl executables into
 `$HOME/foo/bar/multovl-1.3/bin`.
 
 ### For the moderately impatient

quickbuild.sh

@@ -1,26 +1,76 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Quick build script
 # Release build, static linkage.
 # Works on Linux platforms.
 # 2022-05-11 Andras Aszodi
 
+# -- Functions --
+
+# Checks whether the arguments (program names) are in the user's $PATH,
+# exits if not found. 
+exitif_notinpath() {
+    local missing=0
+
+    # iterate over all arguments
+    until [ -z "$1" ]; do
+        which $1 &> /dev/null
+        if [  $? -ne 0 ]; then
+            echo "No $1 in your PATH"
+            let "missing += 1"
+        fi
+        shift
+    done
+    if [ $missing -gt 0 ]; then
+        echo "Please install and then try again."
+        exit 991
+    fi
+}
+
+print_help() {
+	cat <<HELP
+MULTOVL quick build/install script. Works on Linux platforms only.
+Builds a Release version with static linkage.
+Usage: quickbuild.sh <INSTDIR>
+where <INSTDIR> is the installation directory path.
+MULTOVL will be installed in <INSTDIR>/multovl-1.3.
+HELP
+}
+
+# == MAIN ==
+
+# Check pre-requisites
+exitif_notinpath make cmake
+
+# Installation directory
+if [ $# -lt 1 ]; then
+	print_help
+	exit 1
+fi
+INSTDIR=$(realpath $1)
+if [ ! -d $INSTDIR ]; then
+	echo "Installation directory $INSTDIR does not exist"
+	exit 992
+fi
+if [ ! -w $INSTDIR ]; then
+	echo "Installation directory $INSTDIR is not writable by you"
+	exit 993
+fi
+
 # Top-level MULTOVL directory (where this script is located)
 MULTOVLDIR=$( cd $(dirname $0) ; pwd -P )
 
 # Build in this subdirectory
 BUILDDIR=release
-# Install in this directory
-INSTALLDIR=${1:-"/usr/local"}
 
 # Build and install
 mkdir -p $BUILDDIR
 cd $BUILDDIR
-cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${INSTALLDIR} ..
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${INSTDIR} ..
 make -j2 install
 
 # Test the installation
-cd ${INSTALLDIR}/multovl-1.3/bin
+cd ${INSTDIR}/multovl-1.3/bin
 ./multovltest.sh ./multovl
 ./multovl --version