From 9b53ee94dcbc2a4c0470ee565b32dbf5848d0286 Mon Sep 17 00:00:00 2001
From: Christian Bundy <christianbundy@fraction.io>
Date: Wed, 26 Feb 2020 18:07:49 -0800
Subject: [PATCH] Replace C launcher with Golang launcher

Problem: I don't know what I'm doing and can't figure out how to
cross-compile this simple C program to macOS and Windows

Solution: @cryptix reminded me that Go makes cross-compiling easy, so I
took a stab at writing my first Go program. It seems to be working on
macOS and Linux, but I haven't tested on Windows.
---
 scripts/build.sh | 32 +++++++++++++++++---------------
 scripts/oasis.c  | 32 --------------------------------
 scripts/oasis.go | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 47 deletions(-)
 delete mode 100644 scripts/oasis.c
 create mode 100644 scripts/oasis.go

diff --git a/scripts/build.sh b/scripts/build.sh
index 218bb8c..5850869 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -21,7 +21,7 @@ get_tgz () {
 
   wget "$URL"
   tar -xvf "$ARCHIVE" "$TARGET_NODE"
-  rm -rf "$ARCHIVE"
+  rm -f "$ARCHIVE"
 }
 
 get_zip () {
@@ -33,7 +33,7 @@ get_zip () {
 
   wget "$URL"
   unzip "$ARCHIVE" "$TARGET_NODE"
-  rm -rf "$ARCHIVE"
+  rm -f "$ARCHIVE"
 }
 
 get_tgz darwin
@@ -47,24 +47,25 @@ npm ci --only=prod --ignore-scripts --no-audit --no-fund
 # More trouble than it's worth :)
 rm -rf ./node_modules/sharp
 
+export GOARCH="amd64"
+
 # Darwin (shell script)
-cat << EOF > oasis-darwin-x64
-#!/bin/sh
-BASEDIR="\$(dirname "\$0")"
-exec "\$BASEDIR/vendor/node-v$TARGET_VERSION-darwin-x64/bin/node" "\$BASEDIR/src" "\$@"
-EOF
-chmod +x oasis-darwin-x64
+export GOOS="darwin"
+OUTFILE="oasis-$GOOS-$GOARCH"
+go build -ldflags "-X main.node=vendor/node-v$TARGET_VERSION-darwin-x64/bin/node" -o "$OUTFILE" scripts/oasis.go
+chmod +x "$OUTFILE"
 
 # Linux (ELF executable)
-clang scripts/oasis.c  -Wall -g -no-pie -o "oasis-linux-x64" --target=x86_64-linux -D "NODE=\"vendor/node-v$TARGET_VERSION-linux-x64/bin/node\""
-chmod +x oasis-linux-x64
+export GOOS="linux"
+OUTFILE="oasis-$GOOS-$GOARCH"
+go build -ldflags "-X main.node=vendor/node-v$TARGET_VERSION-linux-x64/bin/node" -o "$OUTFILE" scripts/oasis.go
+chmod +x "$OUTFILE"
 
 # Windows (batch file)
-cat << EOF > oasis-win-x64.bat
-vendor\\node-v$TARGET_VERSION-win-x64\\bin\\node src %*
-EOF
-
-chmod +x oasis-win-x64.bat
+export GOOS="windows"
+OUTFILE="oasis-$GOOS-$GOARCH.exe"
+go build -ldflags "-X main.node=vendor\\node-v$TARGET_VERSION-win-x64\\bin\\node" -o "$OUTFILE" scripts/oasis.go
+chmod +x "$OUTFILE"
 
 # I think if the zip already exists it's adding files to the existing archive?
 ZIP_PATH="/tmp/oasis-x64.zip"
@@ -73,3 +74,4 @@ rm -f "$ZIP_PATH"
 zip -r "$ZIP_PATH" . -x ".git/**"
 
 git clean -fdx
+
diff --git a/scripts/oasis.c b/scripts/oasis.c
deleted file mode 100644
index 731a3ca..0000000
--- a/scripts/oasis.c
+++ /dev/null
@@ -1,32 +0,0 @@
-#ifndef NODE
-#define NODE "/usr/bin/node"
-#endif
-
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-
-int main (int argc, char *argv[]) {
-	static const char src[] = "src";
-	char** new_argv = malloc(((argc + 1) * sizeof *new_argv) + strlen(src));
-
-	int pad = 0;
-	for(int i = 0; i < argc; i++) {
-		size_t length = strlen(argv[i]) + 1;
-		new_argv[i + pad] = malloc(length);
-		memcpy(new_argv[i + pad], argv[i], length);
-
-		if (i == 0) {
-			pad = 1;
-			size_t length = strlen(src) + 1;
-			new_argv[i + pad] = malloc(length);
-			memcpy(new_argv[i + pad], src, length);
-		}
-	}
-
-	new_argv[argc + 1] = NULL;
-
-	execv(NODE, new_argv);
-	return 1;
-}
-
diff --git a/scripts/oasis.go b/scripts/oasis.go
new file mode 100644
index 0000000..3eaba20
--- /dev/null
+++ b/scripts/oasis.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+var node string
+
+func main() {
+	node := filepath.Join(filepath.Dir(os.Args[0]), node)
+	src := filepath.Join(filepath.Dir(os.Args[0]), "src")
+
+	args := []string{src}
+
+	for i := 1; i < len(os.Args); i++ {
+		args = append(args, os.Args[i])
+	}
+
+	cmd := exec.Command(node, args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err := cmd.Run()
+
+	if err != nil {
+		fmt.Println(err)
+	}
+
+
+	fmt.Println(args)
+}