From de5cd5a635e3b975ca7acc5caf0363f2811abd95 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 21 Apr 2023 10:53:53 +0900
Subject: [PATCH] Use shorter path as `SPEC_TEMP_DIR`

The temporary directory under the build directory may be too long as a
UNIX socket path.  On macOS, the default `TMPDIR` per user is also
very long.
---
 common.mk             |  3 ++-
 tool/rubyspec_temp.rb | 13 +++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 tool/rubyspec_temp.rb

diff --git a/common.mk b/common.mk
index 38af553992..8baa5be82b 100644
--- a/common.mk
+++ b/common.mk
@@ -873,7 +873,8 @@ test-spec: $(TEST_RUNNABLE)-test-spec
 yes-test-spec: test-spec-precheck
 	$(ACTIONS_GROUP)
 	$(gnumake_recursive)$(Q) \
-	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT) $(SPECOPTS)
+	$(RUNRUBY) -r./$(arch)-fake -r$(tooldir)/rubyspec_temp \
+		$(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT) $(SPECOPTS)
 	$(ACTIONS_ENDGROUP)
 no-test-spec:
 
diff --git a/tool/rubyspec_temp.rb b/tool/rubyspec_temp.rb
new file mode 100644
index 0000000000..339bfce211
--- /dev/null
+++ b/tool/rubyspec_temp.rb
@@ -0,0 +1,13 @@
+require "tmpdir"
+require "fileutils"
+
+if (tmpdir = Dir.mktmpdir("rubyspec_temp.")).size > 80
+  # On macOS, the default TMPDIR is very long, inspite of UNIX socket
+  # path length is limited.
+  Dir.rmdir(tmpdir)
+  tmpdir = Dir.mktmpdir("rubyspec_temp.", "/tmp")
+end
+# warn "tmpdir(#{tmpdir.size}) = #{tmpdir}"
+END {FileUtils.rm_rf(tmpdir)}
+
+ENV["TMPDIR"] = ENV["SPEC_TEMP_DIR"] = tmpdir