configure

#!/bin/bash
# Simple configuration script for people who expect such a script to exist.
# Please do not convert istatd to autotools. We will likely not accept such 
# a conversion. Thanks for your interest in istatd, and good luck!

set -e
set -o nounset

rm -f makevars.config
rm -f config.h

# Find Python version 3.
# If this fails, you need to create appropriate aliases or symlinks for 
# testing to work!
/usr/bin/env python3 -V

if curl --help >/dev/null 2>&1; then echo "Found curl in path."; else
    echo "You need to install the command-line tool 'curl'."
    exit 1
fi

if cat /dev/null | zlib-flate -compress; then echo "Found zlib-flate in path."; else
    echo "You need to install the command-line tool 'zlib-flate'."
    echo "On debian systems run 'sudo apt-get install qpdf'"
    exit 1
fi

echo "# makevars.config for istatd generated on " `date` > makevars.config

BOOST_SYSTEM=""
BOOST_FILESYSTEM=""
BOOST_THREAD=""
BOOST_IOSTREAMS=""
STATGRAB=""
LIBRT=""
DESTDIR=""
USR_PREFIX=""
VAR_PREFIX=""
ETC_PREFIX=""

while [ $# -gt 0 ]; do
    case $1 in
        --boost_system)
            shift
            BOOST_SYSTEM="$1"
            ;;
        --boost_filesystem)
            shift
            BOOST_FILESYSTEM="$1"
            ;;
        --boost_thread)
            shift
            BOOST_THREAD="$1"
            ;;
        --boost_iostreams)
            shift
            BOOST_IOSTREAMS="$1"
            ;;
        --statgrab)
            shift
            STATGRAB="$1"
            ;;
        --librt)
            shift
            LIBRT="$1"
            ;;
        --prefix)
            shift
            DESTDIR="$1"
            ;;
        --usr-prefix)
            shift
            USR_PREFIX="$1"
            ;;
        --var-prefix)
            shift
            VAR_PREFIX="$1"
            ;;
        --etc-prefix)
            shift
            ETC_PREFIX="$1"
            ;;
        *)
            echo "Options:"
            echo "--boost_system     -lboost_system-mt      What is the boost_system library name?"
            echo "--boost_filesystem -lboost_filesystem-mt  What is the boost_filesystem library name?"
            echo "--boost_thread     -lboost_thread-mt      What is the boost_thread library name?"
            echo "--boost_iostreams  -lboost_iostreams-mt   What is the boost_iostreams library name?"
            echo "--statgrab         -lstatgrab             What is the statgrab library name?"
            echo "--librt            -lrt                   What is the librt library name (if any)?"
            echo "--prefix           /                      What is the root of the install?"
            echo "--usr-prefix       /usr                   What is the '/usr' directory for executables?"
            echo "--var-prefix       /var                   What is the '/var' directory for database data?"
            echo "--etc-prefix       /etc                   What is the '/etc/ directory for rc.d scripts?"
            echo "No equal sign for option values."
            exit 1
            ;;
    esac
    shift
done

# see if we need to install boost
if [ ! -d /usr/include/boost -a ! -d /usr/local/include/boost ]; then
    echo "You need to install libboost-all-dev for your distribution."
    exit 1
fi

if [ ! -r /usr/include/statgrab.h -a ! -r /usr/local/include/statgrab.h ]; then
    echo "You need to install libstatgrab-dev for your distribution, or "
    echo "download and install it from source. See README.md"
    exit 1
fi


function findone() {
    libs=$*
    mkdir -p tmp
    fn=tmp/tt$$.c
    echo "int main() { return 0; }" > "$fn"
    for i in $libs; do
        if gcc -o tmp/tt "$fn" $i > /dev/null 2>&1; then
            echo -n $i
            rm -rf tmp
            return
        fi
    done
}

# boost_system is a pain across versions
if [ -z "$BOOST_SYSTEM" ]; then
    BOOST_SYSTEM=`findone -lboost_system -lboost_system-mt`
    if [ -z "$BOOST_SYSTEM" ]; then
        echo "Cannot find boost_system-mt.so (or boost_system.so)"
        echo "Specify it with --boost_system or install libboost-all-dev."
        echo "Ubuntu users can also use ./install-boost-dev.sh as root"
        exit 1
    fi
fi
# boost_filesystem is also somewhat a pain
if [ -z "$BOOST_FILESYSTEM" ]; then
    BOOST_FILESYSTEM=`findone -lboost_filesystem -lboost_filesystem-mt`
    if [ -z "$BOOST_FILESYSTEM" ]; then
        echo "Cannot find boost_filesystem-mt.so (or boost_filesystem.so)"
        echo "Specify it with --boost_filesystem or install libboost-all-dev."
        exit 1
    fi
fi

# RHEL can't find boost_thread on its own.
if [ -z "$BOOST_THREAD" ]; then
    BOOST_THREAD=`findone -lboost_thread -lboost_thread-mt`
    if [ -z "$BOOST_THREAD" ]; then
        echo "Cannot find boost_thread-mt.so (or boost_thread.so)"
        echo "Specify it with --boost_thread or install libboost-all-dev."
        exit 1
    fi
fi

if [ -z "$BOOST_IOSTREAMS" ]; then
    BOOST_IOSTREAMS=`findone -lboost_iostreams -lboost_iostreams-mt`
    if [ -z "$BOOST_IOSTREAMS" ]; then
        echo "Cannot find boost_iostreams-mt.so (or boost_iostreams.so)"
        echo "Specify it with --boost_iostreams or install libboost-all-dev."
        exit 1
    fi
fi

if [ -z "$STATGRAB" ]; then
    STATGRAB=`findone -lstatgrab`
    if [ -z "$STATGRAB" ]; then
        echo "Cannot find libstatgrab.so"
        echo "Specify it with --statgrab or install libstatgrab-dev."
        echo "Or try https://github.com/imvu-open/libstatgrab"
        exit 1
    fi
fi

if [ -z "$LIBRT" ]; then
    mkdir -p tmp
    fn=tmp/tt$$.c
    echo "#include <time.h>" > "$fn"
    echo "int main() { (void)clock_gettime(0, NULL); }" >> "$fn"
    if gcc -o tmp/tt "$fn" > /dev/null 2>&1; then
        LIBRT=""
    else
        LIBRT="-lrt"
    fi
    rm -rf tmp
fi

if [ ! -z "$BOOST_SYSTEM" ]; then
    echo "BOOST_SYSTEM=$BOOST_SYSTEM" >> makevars.config
fi
if [ ! -z "$BOOST_FILESYSTEM" ]; then
    echo "BOOST_FILESYSTEM=$BOOST_FILESYSTEM" >> makevars.config
fi
if [ ! -z "$BOOST_THREAD" ]; then
    echo "BOOST_THREAD=$BOOST_THREAD" >> makevars.config
fi
if [ ! -z "$BOOST_IOSTREAMS" ]; then
    echo "BOOST_IOSTREAMS=$BOOST_IOSTREAMS" >> makevars.config
fi
if [ ! -z "$STATGRAB" ]; then
    echo "STATGRAB=$STATGRAB" >> makevars.config
fi
if [ ! -z "$LIBRT" ]; then
    echo "LIBRT=$LIBRT" >> makevars.config
fi
if [ ! -z "$DESTDIR" ]; then
    echo "DESTDIR=$DESTDIR" >> makevars.config
fi
if [ ! -z "$USR_PREFIX" ]; then
    echo "USR_PREFIX=$USR_PREFIX" >> makevars.config
fi
if [ ! -z "$VAR_PREFIX" ]; then
    echo "VAR_PREFIX=$VAR_PREFIX" >> makevars.config
fi
if [ ! -z "$ETC_PREFIX" ]; then
    echo "ETC_PREFIX=$ETC_PREFIX" >> makevars.config
fi

echo "checking for libstatgrab interface version"
echo "/* config.h generated by configure script */" >> config.h
echo "" >> config.h

mkdir -p tmp
fn=tmp/sg.c
echo "#include <statgrab.h>" > "$fn"
echo "int main() { sg_get_cpu_percents(); }" >> "$fn"
if ! gcc -o tmp/sg.o -c "$fn" > /dev/null 2>&1; then
    echo "libstatgrab 0.17 interface doesn't work, assuming 0.90"
    echo "#define LIBSTATGRAB_API_0_90" >> config.h
else
    echo "found libstatgrab 0.17 interface"
    echo "#define LIBSTATGRAB_API_0_17" >> config.h
fi
rm -rf tmp

echo "All done"