01-goenv.patch

commit 33fda521f72037473a9153266a28e2dedc510f02
Author: phus.lu <phus.lu@gmail.com>
Date:   2022-06-17 23:49:02 +0800

    go/build: add go.env support

diff --git a/src/go/build/build.go b/src/go/build/build.go
index dd6cdc903a..735d93c27d 100644
--- a/src/go/build/build.go
+++ b/src/go/build/build.go
@@ -352,6 +352,54 @@ func defaultContext() Context {
 		c.CgoEnabled = false
 	}
 
+	if os.Getenv("GOENV_ENABLED") != "0" {
+		dir, _ := os.Getwd()
+		var lines []string
+		for i := 0; i < 9; i++ {
+			if data, _ := os.ReadFile(filepath.Join(dir, "go.env")); len(data) != 0 {
+				lines = strings.Split(string(data), "\n")
+				break
+			}
+			if fi, _ := os.Stat(filepath.Join(dir, ".git")); fi != nil && fi.IsDir() {
+				break
+			}
+			if dir = filepath.Dir(dir); dir == "/" {
+				break
+			}
+		}
+		for _, line := range lines {
+			parts := strings.SplitN(line, "=", 2)
+			if len(parts) == 1 || strings.HasPrefix(strings.TrimSpace(line), "#") {
+				continue
+			}
+			key := strings.TrimSpace(parts[0])
+			value := strings.TrimSpace(parts[1])
+			os.Setenv(key, value)
+			switch key {
+			case "CGO_ENABLED":
+				switch value {
+				case "1":
+					c.CgoEnabled = true
+				case "0":
+					c.CgoEnabled = false
+				}
+			case "GOOS":
+				c.GOOS = value
+			case "GOARCH":
+				c.GOARCH = value
+			case "GOPATH":
+				c.GOPATH = value
+			case "GOROOT":
+				c.GOROOT = value
+			case "http_proxy":
+				os.Setenv("http_proxy", value)
+				os.Setenv("https_proxy", value)
+				os.Setenv("HTTP_PROXY", value)
+				os.Setenv("HTTPS_PROXY", value)
+			}
+		}
+	}
+
 	return c
 }