#!/usr/bin/env sh

: \
 && die() \
    { : \
     && printf '\033[1m%s:\033[m %s\n' acquire "$@" \
     && exit 64 \
     ;} \
 && { [ -d "/tmp" ] || die '/tmp must be mounted (or just exist)' ;} \
 && { [ -n "$dest" ] || die 'dest must be set' ;} \
 && { [ -n "$local_fn" ] || die 'local_fn must be set' ;} \
 && { [ -n "$remote_fn" ] || die 'remote_fn must be set' ;} \
 && { [ -n "$remote_url" ] || die 'remote_url must be set' ;} \
 && { [ -n "$sha256" ] || die 'sha256 must be set' ;} \
 && { : \
     && printf '%s  %s\n' "$sha256" "$local_fn" | sha256sum -c - >/dev/null 2>&1 \
     || wget -q "$remote_url" -O "$local_fn" \
     && printf '%s  %s\n' "$sha256" "$local_fn" | sha256sum -c - \
     || { sha256sum "$local_fn"; exit 1 ;} \
     ;} \
 && temp="$(mktemp -d)" \
 && tar -axof "$local_fn" -C "$temp" \
 && find "$temp" -mindepth 1 -maxdepth 1 >/tmp/files \
 && find "$temp" -mindepth 1 -maxdepth 1 -type d >/tmp/dirs \
 && { [ -d "$dest" ] || mkdir "$dest" ;} \
 && if [ "$(wc -l </tmp/files)" = 1 ] && [ "$(wc -l </tmp/dirs)" = 1 ] \
    ;then : \
     && find "$temp" -mindepth 2 -maxdepth 2 -exec cp -rp {} "$dest" + \
    ;else : \
     && cp -rp "$temp" "$dest" \
    ;fi \
;