Merge pull request #18391 from Homebrew/shorten_brew_tests_temp_path

Shorten `brew tests` temporary paths.

Library/Homebrew/test/support/lib/startup/config.rb

@@ -5,8 +5,9 @@
 
 HOMEBREW_BREW_FILE = Pathname.new(ENV.fetch("HOMEBREW_BREW_FILE")).freeze
 
+homebrew_temp = ENV.fetch("HOMEBREW_TEMP")
 TEST_TMPDIR = ENV.fetch("HOMEBREW_TEST_TMPDIR") do |k|
- dir = Dir.mktmpdir("homebrew-tests-", ENV.fetch("HOMEBREW_TEMP"))
+ dir = Dir.mktmpdir("homebrew-tests-", homebrew_temp)
  at_exit do
  # Child processes inherit this at_exit handler, but we don't want them
  # to clean TEST_TMPDIR up prematurely (i.e. when they exit early for a test).
@@ -15,6 +16,13 @@
  ENV[k] = dir
 end.freeze
 
+# Use a shorter HOMEBREW_TEMP path so Sequoia doesn't error out as often on long paths (> 104 bytes).
+# Use the minimal amount of randomness to avoid collisions while allowing parallel tests.
+require "securerandom"
+random_hex = SecureRandom.hex(1)
+HOMEBREW_TEMP = Pathname("#{homebrew_temp}/brewtests#{random_hex}".squeeze("/")).freeze
+HOMEBREW_TEMP.mkpath
+
 # Paths pointing into the Homebrew code base that persist across test runs
 HOMEBREW_SHIMS_PATH = (HOMEBREW_LIBRARY_PATH/"shims").freeze
 
@@ -32,7 +40,6 @@
 HOMEBREW_LOCKS = (HOMEBREW_PREFIX.parent/"locks").freeze
 HOMEBREW_CELLAR = (HOMEBREW_PREFIX.parent/"cellar").freeze
 HOMEBREW_LOGS = (HOMEBREW_PREFIX.parent/"logs").freeze
-HOMEBREW_TEMP = (HOMEBREW_PREFIX.parent/"temp").freeze
 HOMEBREW_TAP_DIRECTORY = (HOMEBREW_LIBRARY/"Taps").freeze
 HOMEBREW_RUBY_EXEC_ARGS = [
  RUBY_PATH,