Bash 实例：探讨 ebuild 系统

#!/usr/bin/env bash



if [ $# -ne 2 ]

then 

    echo "Please specify ebuild file and unpack, compile or all"

    exit 1

fi



source /etc/ebuild.conf



if [ -z "$DISTDIR" ]

then 

    # set DISTDIR to /usr/src/distfiles if not already set

    DISTDIR=/usr/src/distfiles

fi

export DISTDIR



ebuild_unpack() {

    #make sure we're in the right directory 

    cd $

    

    if [ -d $ ]

    then    

        rm -rf $

    fi



    mkdir $

    cd $

    if [ ! -e $/$ ]

    then

        echo "$/$ does not exist.  Please download first."

        exit 1

    fi

    tar xzf $/$

    echo "Unpacked $/$."

    #source is now correctly unpacked

}



user_compile() {

    #we're already in $

    if [ -e configure ]

    then

        #run configure script if it exists

        ./configure --prefix=/usr

    fi

        #run make

        make $MAKEOPTS MAKE="make $MAKEOPTS"  

} 



ebuild_compile() {

    if [ ! -d "$" ]

    then

        echo "$ does not exist -- please unpack first."

        exit 1

    fi

        #make sure we're in the right directory  

    cd $

    user_compile

}



export ORIGDIR=`pwd`

export WORKDIR=$/work



if [ -e "" ]

then 

    source 

else

    echo "Ebuild file  not found."

    exit 1

fi



export SRCDIR=$/$



case "" in

    unpack)

        ebuild_unpack

        ;;

    compile)

        ebuild_compile

        ;;

    all)

        ebuild_unpack

        ebuild_compile

        ;;

    *)

        echo "Please specify unpack, compile or all as the second arg"

        exit 1

        ;;

esac