source: npl/findbuilddeps @ ffaaf60

#!/bin/bash

if ! [ "$1" ]; then
    echo "$0 packagename of buildscript path"
    echo "Bepaald recursief alle build dependencies van de meegeven pacakage. Dus alle NEEDs en DEPs"
    exit 1
fi

cd `dirname $0` || exit 1

export BUILDDEPS=""

getdeps()
{
    if ! [ -f $1 ]; then
        BUILDSCRIPT=`./findbuild $1`.SlackBuild || exit 1
    else
        BUILDSCRIPT=$1
    fi

    DEPS="`cat "$BUILDSCRIPT"|egrep '^#DEP:'|cut -f2 -d':'`" || exit 1
    for DEP in $DEPS; do
        if ! echo "$BUILDDEPS" | grep " $DEP " >/dev/null; then
            BUILDDEPS="$BUILDDEPS $DEP "
            #recurse
            getdeps $DEP || exit 1
        fi
    done
}


if ! [ -f $1 ]; then
    BUILDSCRIPT=`./findbuild $1`.SlackBuild || exit 1
else
    BUILDSCRIPT=$1
fi

#toplevel needs
BUILDDEPS="$BUILDDEPS `cat "$BUILDSCRIPT"|egrep '^#NEED:'|cut -f2 -d':'| tr '\n' ' '`" || exit 1

#toplevel deps
BUILDDEPS="$BUILDDEPS `cat "$BUILDSCRIPT"|egrep '^#DEP:'|cut -f2 -d':'| tr '\n' ' '`"  || exit 1

#toplevel deps_dev, if they exists
DEVS="`cat "$BUILDSCRIPT"|egrep '^#DEP:'|cut -f2 -d':'| sed 's/$/_dev/g'| tr '\n' ' '`" || exit 1
for DEV in $DEVS; do
    if ./findbuild $DEV 2>/dev/null >/dev/null ; then
        BUILDDEPS="$BUILDDEPS $DEV" || exit 1
    fi
done

#determine sub-deps recursively, because those usually are runtime dependencies as well
DEPS="`cat "$BUILDSCRIPT"|egrep '(^#DEP:|^#NEED)'|cut -f2 -d':'`" || exit 1
for DEP in $DEPS; do
    getdeps $DEP || exit 1
done

#output
for DEP in $BUILDDEPS; do
    echo $DEP
done