From 4bb25bda9701984c8bfdf55458c9c0b7ad0bf067 Mon Sep 17 00:00:00 2001
From: David Scott <dave@recoil.org>
Date: Mon, 25 Jul 2022 07:56:57 +0100
Subject: [PATCH] Fix Makefile

Before:
```
djs55@m1 linuxkit % make
make -C ./src/cmd/linuxkit
tar cf - -C . . | docker run --rm --net=none --log-driver=none -i -e GOOS= -e GOARCH= linuxkit/go-compile:7b1f5a37d2a93cd4a9aa2a87db264d8145944006 --package github.com/linuxkit/linuxkit/src/cmd/linuxkit --ldflags "-X github.com/linuxkit/linuxkit/src/cmd/linuxkit/version.GitCommit=a201652e0dabfc7f62b14ac1a43b5572a8ecae9a -X github.com/linuxkit/linuxkit/src/cmd/linuxkit/version.Version="v0.8+"" -o linuxkit > tmp_linuxkit_bin.tar
gofmt...
govet...
golint...
ineffassign...
go build...

djs55@m1 linuxkit % file bin/linuxkit
bin/linuxkit: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), static-pie linked, Go BuildID=alxJ_URcsHKe5NnzKTgb/kT7Da_wy0_5L3jkAxzZ7/jVuNyKW2yhIE_wT0QFHL/g86-fS2la_qumeAPHD40, stripped

djs55@m1 linuxkit % ./bin/linuxkit
zsh: exec format error: ./bin/linuxkit
```

After:
```
djs55@m1 linuxkit % make
make -C ./src/cmd/linuxkit
CGO_ENABLED=1 go build -o /Users/djs55/github.com/djs55/linuxkit/bin/linuxkit  --ldflags "-X github.com/linuxkit/linuxkit/src/cmd/linuxkit/version.GitCommit=df47d22bce0a1767e6e0c967d9b516cc656d7db4 -X github.com/linuxkit/linuxkit/src/cmd/linuxkit/version.Version="v0.8+""
codesign --entitlements linuxkit.entitlements --force -s - /Users/djs55/github.com/djs55/linuxkit/bin/linuxkit
/Users/djs55/github.com/djs55/linuxkit/bin/linuxkit: replacing existing signature

djs55@m1 linuxkit % file ./bin/linuxkit
./bin/linuxkit: Mach-O 64-bit executable arm64

djs55@m1 linuxkit % ./bin/linuxkit
Please specify a command.

USAGE: linuxkit [options] COMMAND
```

Signed-off-by: David Scott <dave@recoil.org>
---
 Makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 271a440f3..7857f642e 100644
--- a/Makefile
+++ b/Makefile
@@ -5,14 +5,16 @@ GO_COMPILE=linuxkit/go-compile:7b1f5a37d2a93cd4a9aa2a87db264d8145944006
 ifeq ($(OS),Windows_NT)
 LINUXKIT?=$(CURDIR)/bin/linuxkit.exe
 RTF?=bin/rtf.exe
+GOOS?=windows
 else
 LINUXKIT?=$(CURDIR)/bin/linuxkit
 RTF?=bin/rtf
+GOOS?=$(shell uname -s | tr '[:upper:]' '[:lower:]')
 endif
-ifneq ($(GOOS),)
+ifneq ($(GOOS),linux)
 CROSS+=-e GOOS=$(GOOS)
 endif
-ifneq ($(GOARCH),)
+ifneq ($(GOARCH),amd64)
 CROSS+=-e GOARCH=$(GOARCH)
 endif