From 1b2c45f9d037aa17f2dfc4ccac08bb689e2ce003 Mon Sep 17 00:00:00 2001
From: Kyle Wood <demonwav@gmail.com>
Date: Fri, 23 Feb 2018 18:58:45 -0600
Subject: [PATCH] Use a more general method of aliasing md5sum

Rather than checking the platform or operating system, simply check if
the command exists. If the check fails, check if the md5 command exists.
If that fails as well, cancel the build script. Otherwise, assign the
alias as before.
---
 scripts/remap.sh | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/scripts/remap.sh b/scripts/remap.sh
index e9817bcb4..c64bcca87 100755
--- a/scripts/remap.sh
+++ b/scripts/remap.sh
@@ -24,11 +24,16 @@ if [ ! -f  "$jarpath.jar" ]; then
 fi
 
 # OS X & FreeBSD don't have md5sum, just md5 -r
-if [[ "$OSTYPE" == "darwin"* || "$(uname)" == "FreeBSD" ]]; then
-   shopt -s expand_aliases
-   alias md5sum='md5 -r'
-   echo "Using an alias for md5sum on macOS and/or FreeBSD"
-fi
+command -v md5sum >/dev/null 2>&1 || {
+    command -v md5 >/dev/null 2>&1 && {
+        shopt -s expand_aliases
+        alias md5sum='md5 -r'
+        echo "md5sum command not found, using an alias instead"
+    } || {
+        echo >&2 "No md5sum or md5 command found"
+        exit 1
+    }
+}
 
 checksum=$(md5sum "$jarpath.jar" | cut -d ' ' -f 1)
 if [ "$checksum" != "$minecrafthash" ]; then