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## library functions

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function die () {

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    echo "!!! $@" >&2

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    exit 1

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}

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# Execute command verbosely, and exit on failure

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function cmd () {

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    echo ">>> $@"

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    [ $_MOCK ] && return 0

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    eval "$@" # return $?

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}

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function expand_MB () {

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    local size=${1^}

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    case ${size: -1} in 

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        G)

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            size=$(( ${size%G} * 1024))

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            ;;

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    esac

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    echo $size

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}

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function extract_iso () {

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    iso=$1

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    dst=$2

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    [ ! -r "$iso" ] && die "Given .iso is not readable: $iso"

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    [ -z "$dst" ] && die "Must give destination: $dst"

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    [ -e "$dst" ] && die "Given destination already exists: $dst"

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    # temporary mount

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    mnt=$(mktemp -d mnt.XXXX)

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    # clean on exit

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    function cleanup () {

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        if mountpoint -q $mnt; then

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           sudo umount $mnt

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        fi

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        [ -d $mnt ] && rmdir $mnt

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        return $1

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    }

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    # loop-mount

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    cmd sudo mount -o loop $iso $mnt || cleanup 1

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    # copy

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    cmd cp -r $mnt $dst || cleanup 1

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    # done, cleanup

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    cleanup 0

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}

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function my_md5sum () {

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    /usr/bin/md5sum $1 | (

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        read md5sum path

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        echo $md5sum

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    )

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}

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function expand_template () {

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    local tpl=$1

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    local out=$2

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    local linecount=0

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    # read in each line at a time

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    while IFS='' read -r line; do

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        linecount=$((linecount + 1))

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        if [ "${line:0:1}" == "#" ]; then

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            # ignore comments; pass through as-is

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            echo "$line"

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        else

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            # evaluate {...} expressions

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            # a slight hack, but it works \o/

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            # http://stackoverflow.com/questions/415677/how-to-replace-placeholders-in-a-text-file/7633579#7633579

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            line="${line//\\/\\\\}"

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            line="${line//\"/\\\"}"

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            line="${line//\`/\\\`}"

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            line="${line//\$/\\\$}"

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            line="${line//{/\${}"   # This is just for vim: } "

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            # echo "($line)" >&2

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            (eval "echo \"$line\"") || die "Error at $tpl:$linecount: $line"

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        fi

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    done < $tpl > $out

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}

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# Recursive expand_template files from src -> dst

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# XXX: not used

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function expand_tree () {

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    local src=$1

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    local dst=$2

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    local filter=${3:-'*'}

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    for path in ${src}/${filter}; do

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        local name=$(basename $path)

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        local target=$dst/$name

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        if [ -d $path ]; then

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            echo "expand_tree: $path -> $target"

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            echo "expand_tree $path $target $filter"

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        elif [ -f $path ]; then

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            echo "expand_file: $path -> $target"

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            echo "expand_file $path $target"

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        else

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            echo "XXX: ignore weird file: $path"

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        fi

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    done

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}