Fix unable to test greater than 2GiB file and fix failing build

.gitignore

@@ -1,2 +1,9 @@
+# Docker
 docker/build
 docker/cache
+
+# OS
+.DS_Store
+
+# App
+.*.swp

Dockerfile

@@ -1,13 +1,11 @@
-FROM ubuntu:rolling AS deps
-RUN export DEBIAN_FRONTEND=noninteractive \
-    && apt-get update \
-    && apt-get upgrade -y \
-    && apt-get install -y fio \
-    && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*
+# Use an official base image
+FROM alpine:latest AS deps
+RUN apk update && \
+    apk upgrade && \
+    apk add --no-cache bash fio linux-firmware-none lsblk
 
 FROM deps
-COPY diskmark.sh /usr/bin/diskmark
+COPY diskmark.sh /usr/local/bin/diskmark
 VOLUME /disk
 WORKDIR /disk
 ENV TARGET="/disk"

diskmark.sh

@@ -317,7 +317,7 @@ if [ $WARMUP -eq 1 ]; then
   else
     FILESOURCE=/dev/urandom
   fi
-  dd if="$FILESOURCE" of="$TARGET/.diskmark.tmp" bs="$BYTESIZE" count=1 oflag=direct
+  dd if="$FILESOURCE" of="$TARGET/.diskmark.tmp" bs="$BYTESIZE" count=1 oflag=direct iflag=fullblock
 fi
 
 for ((i = 0; i < ${#NAME[@]}; i++)); do