add tamago build in ci

Author: gballet

build/checksums.txt

@@ -49,6 +49,11 @@ e94732c94f149690aa0ab11c26090577211b4a988137cb2c03ec0b54e750402e  go1.25.1.plan9
 1261dfad7c4953c0ab90381bc1242dc54e394db7485c59349428d532b2273343  go1.25.1.solaris-amd64.tar.gz
 04bc3c078e9e904c4d58d6ac2532a5bdd402bd36a9ff0b5949b3c5e6006a05ee  go1.25.1.windows-arm64.zip
 
+# version:tamago 1.25.6
+# https://github.com/usbarmory/tamago-go/releases/download/tamago-go1.25.6/
+fbab70549e5977150d9095829608b5b8c7a6226930f91beb8edd614f2a71348e  tamago-go1.25.6.linux-amd64.tar.gz
+8bfc5a4f2ff54625c3a26a1b8749a6639d9f85dbd2f687c41c932517c0814368  tamago-go1.25.6.linux-armv7l.tar.gz
+
 # version:golangci 2.4.0
 # https://github.com/golangci/golangci-lint/releases/
 # https://github.com/golangci/golangci-lint/releases/download/v2.4.0/

build/ci.go

@@ -107,6 +107,13 @@ var (
 			Tags: "ziren",
 			Env:  map[string]string{"GOMIPS": "softfloat", "CGO_ENABLED": "0"},
 		},
+		{
+			Name:   "tamago",
+			GOOS:   "tamago",
+			GOARCH: "riscv64",
+			Tags:   "tamago",
+			Env:    map[string]string{"CGO_ENABLED": "0"},
+		},
 		{
 			Name:   "wasm-js",
 			GOOS:   "js",
@@ -281,16 +288,37 @@ func doInstallKeeper(cmdline []string) {
 	flag.CommandLine.Parse(cmdline)
 	env := build.Env()
 
-	// Configure the toolchain.
+	var (
+		csdb       *download.ChecksumDB
+		tamagoRoot string
+	)
 	tc := build.GoToolchain{}
 	if *dlgo {
-		csdb := download.MustLoadChecksums("build/checksums.txt")
-		tc.Root = build.DownloadGo(csdb)
+		csdb = download.MustLoadChecksums("build/checksums.txt")
 	}
 
 	for _, target := range keeperTargets {
 		log.Printf("Building keeper-%s", target.Name)
 
+		// Configure the toolchain.
+		if target.Name == "tamago" {
+			if runtime.GOOS != "linux" {
+				log.Printf("Skipping keeper-%s (tamago builds are only supported on linux hosts)", target.Name)
+				continue
+			}
+			if !*dlgo {
+				log.Printf("Skipping keeper-%s (tamago build requires -dlgo)", target.Name)
+				continue
+			}
+
+			if tamagoRoot == "" {
+				tamagoRoot = downloadTamago(csdb)
+			}
+			tc.Root = tamagoRoot
+		} else if *dlgo {
+			tc.Root = build.DownloadGo(csdb)
+		}
+
 		// Configure the build.
 		tc.GOARCH = target.GOARCH
 		tc.GOOS = target.GOOS
@@ -447,6 +475,42 @@ func downloadSpecTestFixtures(csdb *download.ChecksumDB, cachedir string) string
 	return filepath.Join(cachedir, base)
 }
 
+// downloadTamago downloads the tamago-go toolchain and returns its GOROOT.
+func downloadTamago(csdb *download.ChecksumDB) string {
+	version, err := csdb.FindVersion("tamago")
+	if err != nil {
+		log.Fatal(err)
+	}
+	if runtime.GOOS != "linux" {
+		log.Printf("Skipping tamago toolchain download (unsupported host os: %s)", runtime.GOOS)
+		return ""
+	}
+	arch := runtime.GOARCH
+	if arch == "arm" {
+		arch = "armv7l"
+	}
+	file := fmt.Sprintf("tamago-go%s.%s-%s.tar.gz", version, runtime.GOOS, arch)
+
+	ucache, err := os.UserCacheDir()
+	if err != nil {
+		log.Fatal(err)
+	}
+	dst := filepath.Join(ucache, file)
+	if err := csdb.DownloadFileFromKnownURL(dst); err != nil {
+		log.Fatal(err)
+	}
+
+	toolRoot := filepath.Join(ucache, fmt.Sprintf("geth-tamago-go-%s-%s-%s", version, runtime.GOOS, arch))
+	if err := build.ExtractArchive(dst, toolRoot); err != nil {
+		log.Fatal(err)
+	}
+	goroot, err := filepath.Abs(filepath.Join(toolRoot, "go"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	return goroot
+}
+
 // doCheckGenerate ensures that re-generating generated files does not cause
 // any mutations in the source file tree.
 func doCheckGenerate() {