gistfile1.sh

#!/bin/sh

usage(){
    cat <<EOF
Usage: $0 [add|del] [-n] pkg

add add pkg to the system
    -n don't update already installed pkg
del remove pkg from the system

set \$PKG_ROOT to the root of the file system you want $0 to operate on
EOF
    exit 255
}

[ $# -lt 2 ] && usage

op=
update="true"
pkg=

for p in "$@"; do
    case "$p" in
        add)
            op="add"
            ;;
        del)
            op="del"
            ;;
        -n)
            update="false"
            ;;
        *)
            pkg="$p"
            ;;
    esac
done

if [ ! -d "$PKG_ROOT/pkg" ]; then
    echo "$PKG_ROOT/pkg does not exist. This most likely means you might now want to install into $PKG_ROOT."
    echo "Sleeping 10 seconds, hit ^C to abort."
    n=10
    while [ $n -gt 0 ]; do
        sleep 1
        echo -n "."
        n=`expr $n - 1`
    done
    echo
fi

case "$op" in
    add)
        if [ ! -f "$pkg/data.tar.bz2" ]; then
            echo "$pkg/data.tar.bz2 can not be read"
            exit 255
        fi
        if [ -d "$PKG_ROOT/pkg/$pkg" -a "$update" == "false" ]; then
            exit 255
        fi
        mkdir -p "$PKG_ROOT/pkg/`basename $pkg`"
        echo "installing $pkg"
        if [ -f "$pkg/deps" ]; then
            while read d; do
                $0 add `dirname $pkg`/`basename "$d"`
            done < "$pkg/deps"
        fi
        bzip2 -dc "$pkg/data.tar.bz2" | tar xvC "$PKG_ROOT/" > "$PKG_ROOT/pkg/`basename $pkg`/files"
        exit $?
        ;;
    del)
        if [ ! -d "$PKG_ROOT/pkg/$pkg" ]; then
            echo "$PKG_ROOT/pkg/$pkg does not exist or is not a directory"
            exit 255
        fi
        if [ ! -e "$PKG_ROOT/pkg/$pkg/files" ]; then
            echo "$PKG_ROOT/pkg/$pkg/files does not exist"
        fi
        tac "$PKG_ROOT/pkg/$pkg/files" | while read f; do
            f="/$f"
            if [ ! -d "$f" ]; then
                rm "$f"
            elif [ `find "$f" | wc -l` -eq 0 ]; then
                rm -r "$f"
            fi
        done
        rm -rf "$PKG_ROOT/pkg/$pkg"
        ;;
    *)
        usage
        ;;
esac