From b2eb1e7f002c8f8ea7ccf8d73601ae3c7a730a3e Mon Sep 17 00:00:00 2001
From: Kyle Wood <kyle@denwav.dev>
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 e9817bcb4f..c64bcca87f 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