From 296ce3ad89ed5129f34dce5b314d37d9d128e402 Mon Sep 17 00:00:00 2001
From: aameen-tulip <98349328+aameen-tulip@users.noreply.github.com>
Date: Tue, 26 Apr 2022 15:56:27 -0500
Subject: [PATCH] Permit users to set uname info

This allows users on multi-arch systems to explicitly set their architecture in their environment.

Overriding `ARCH` is necessary for systems which run without a `uname` binary which has been extended to "lie" about the system's architecture in different contexts. For example on a multi-arch build system `mongo` may be running in an execution mode which differs from the host execution mode; currently you either have to modify `mongo` or patch `uname` to "lie" in order to get the desired `ARCH`.

This change doesn't require a patched `mongo` or `uname` binary.
  Ex:
```
PATH="/usr/local/opt/gnu-coreutils/bin${PATH+:$PATH}" ARCH=x86_64;
export PATH ARCH;
/usr/bin/arch -x86_64 ~/.meteor/packages/meteor-tool/2.5.6/mt-os.osx.x86_64/meteor ARGS...;
```
For context `gnu-coreutils`'s `uname` is agnostic to the effects of `arch -x86_64` and would output `arm64` in this case when we actually want `x86_64`.
---
 meteor | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/meteor b/meteor
index 3ff57c86d6..6c71dff39f 100755
--- a/meteor
+++ b/meteor
@@ -4,7 +4,12 @@ BUNDLE_VERSION=14.19.1.0
 
 # OS Check. Put here because here is where we download the precompiled
 # bundles that are arch specific.
-UNAME=$(uname)
+# Use of : "${ARCH:=$(uname)}" assignment permits users to set their
+# architecture manually; this is useful for multi-arch systems whose
+# uname executables may sometimes return different architectures in
+# different contexts.
+#   Ex: ARCH=arm64 meteor ARGS...;
+UNAME="$(uname)"
 if [ "$UNAME" != "Linux" -a "$UNAME" != "Darwin" ] ; then
     echo "Sorry, this OS is not supported."
     exit 1
@@ -12,7 +17,7 @@ fi
 
 if [ "$UNAME" = "Darwin" ] ; then
     if [ "arm64" == "$(uname -m)" ]; then
-      ARCH="arm64"
+      : "${ARCH:=arm64}"
     else
       if [ "i386" != "$(uname -p)" -o "1" != "$(sysctl -n hw.cpu64bit_capable 2>/dev/null || echo 0)" ] ; then
 
@@ -21,10 +26,10 @@ if [ "$UNAME" = "Darwin" ] ; then
           echo "Only 64-bit and arm64 processors are supported at this time."
           exit 1
       fi
-      ARCH="x86_64"
+      : "${ARCH:=x86_64}"
     fi
 elif [ "$UNAME" = "Linux" ] ; then
-    ARCH="$(uname -m)"
+    : "${ARCH:=$(uname -m)}"
     if [ "$ARCH" != "x86_64" ] ; then
         echo "Unsupported architecture: $ARCH"
         echo "Meteor only supports x86_64"