#!/bin/sh -e

#. "$LIXROOT/libs/reverse.sh"

# errors out if a dependency was not resolved or if the LAYERMAX is exceeded.
lowerlayers() { # <resolved dependencies> [<bootstrap directory>]
    layers="$2"
    layercount="0"
    maxlayers=${LAYERMAX:-100}

    layers="$(echo "$1" | reverse | while read line; do
        [ "$line" ] || continue;

        dep="$(echo "$line" | awk '{ print $1 }')"
        ver="$(echo "$line" | awk '{ print $2 }')"
        dir="$(lyr upperdir lix/$dep/$ver/fs)"

        # only warn on missing dependencies if a bootstrap directory was
        # provided.  it's possible the dependency is in the bootstrap.
        [ "$2" ] && logfn="wrn possible" || logfn="err"

        [ "$ver" ] && [ -d "$dir" ] \
        && printf "$dir:" \
        || $logfn "missing dependency: $dep $ver"

        layercount="$(expr $layercount + 1)"
        [ "$layercount" -le "$maxlayers" ] \
        || err "overlayfs can't handle more than $maxlayers lower directories!"

    done)$layers"

    [ "$?" -eq 0 ] || exit $? # error codes weren't bubbling up... :/

    # strip possible trailing colon and echo.
    echo "${layers%:}"
}