testing: use env var for configuring debugaddress for tests

Unix socket support for --debugaddr was added later what means the
test suite can not be used to test old versions of releases anymore.
This makes debug address configurable via env variable so that old
versions can just ignore it without crashing.

Signed-off-by: Tonis Tiigi <[email protected]>

cmd/buildkitd/main.go

@@ -193,9 +193,10 @@ func main() {
 			Value: groupValue(defaultConf.GRPC.GID),
 		},
 		cli.StringFlag{
-			Name:  "debugaddr",
-			Usage: "debugging address (eg. 0.0.0.0:6060)",
-			Value: defaultConf.GRPC.DebugAddress,
+			Name:   "debugaddr",
+			Usage:  "debugging address (eg. 0.0.0.0:6060)",
+			Value:  defaultConf.GRPC.DebugAddress,
+			EnvVar: "BUILDKITD_DEBUGADDR",
 		},
 		cli.StringFlag{
 			Name:  "tlscert",

util/testutil/workers/util.go

@@ -73,12 +73,13 @@ func runBuildkitd(
 	address := getBuildkitdAddr(tmpdir)
 	debugAddress := getBuildkitdDebugAddr(tmpdir)
 
-	args = append(args, "--root", tmpdir, "--addr", address, "--debugaddr", debugAddress, "--debug")
+	args = append(args, "--root", tmpdir, "--addr", address, "--debug")
 	cmd := exec.Command(args[0], args[1:]...) //nolint:gosec // test utility
 	cmd.Env = append(
 		os.Environ(),
 		"BUILDKIT_DEBUG_EXEC_OUTPUT=1",
 		"BUILDKIT_DEBUG_PANIC_ON_ERROR=1",
+		"BUILDKITD_DEBUGADDR="+debugAddress,
 		"TMPDIR="+filepath.Join(tmpdir, "tmp"))
 	if v := os.Getenv("GO_TEST_COVERPROFILE"); v != "" {
 		coverDir := filepath.Join(filepath.Dir(v), "helpers")