fixes and adds tests for the dehumanize function

Author: Arturo Pie

packer/linux/conf/bin/bk-check-disk-space.sh

@@ -7,14 +7,7 @@ set -euo pipefail
 # or 500M, or a percentage like 5%
 # min inodes must be a number, default to 250,000
 
-# Converts human-readable units like 1.43K and 120.3M to bytes
-dehumanize() {
-  awk '/[0-9][bB]?$/ {printf "%u\n", $1*1024}
-       /[tT][bB]?$/  {printf "%u\n", $1*(1024*1024*1024)}
-       /[gG][bB]?$/  {printf "%u\n", $1*(1024*1024)}
-       /[mM][bB]?$/  {printf "%u\n", $1*(1024)}
-       /[kK][bB]?$/  {printf "%u\n", $1*1}' <<< "$1"
-}
+. "$(dirname "$0")"/dehumanize.sh
 
 min_available=${1:-5G}
 docker_dir="/var/lib/docker/"

packer/linux/conf/bin/dehumanize-test.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+set -o pipefail
+
+. "$(dirname "$0")"/dehumanize.sh
+
+test_without_unit(){
+  assertEquals 45 $(dehumanize 45)
+}
+
+test_bytes(){
+  assertEquals 45 $(dehumanize 45b)
+  assertEquals 45 $(dehumanize 45B)
+}
+
+test_kilobytes(){
+  assertEquals 46080 $(dehumanize 45kb)
+  assertEquals 46080 $(dehumanize 45KB)
+}
+
+test_megabytes(){
+  assertEquals 47185920 $(dehumanize 45mb)
+  assertEquals 47185920 $(dehumanize 45MB)
+}
+
+test_gigabytes(){
+  assertEquals 48318382080 $(dehumanize 45gb)
+  assertEquals 48318382080 $(dehumanize 45GB)
+}
+
+test_terabytes(){
+  assertEquals 49478023249920 $(dehumanize 45tb)
+  assertEquals 49478023249920 $(dehumanize 45TB)
+}
+
+test_using_decimals(){
+  assertEquals 1610612736 $(dehumanize 1.5gb)
+}
+
+. shunit2

packer/linux/conf/bin/dehumanize.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Converts human-readable units like 1.43K and 120.3M to bytes
+dehumanize() {
+  awk '/[0-9][bB]?$/ {printf "%u\n", $1*1}
+       /[tT][bB]?$/  {printf "%u\n", $1*(1024*1024*1024*1024)}
+       /[gG][bB]?$/  {printf "%u\n", $1*(1024*1024*1024)}
+       /[mM][bB]?$/  {printf "%u\n", $1*(1024*1024)}
+       /[kK][bB]?$/  {printf "%u\n", $1*1024}' <<< "$1"
+}