806faea7

test: e2e isolates XDG_RUNTIME_DIR, so the default socket is hermetic

a73x 2026-09-01 15:00

Commit message

test: e2e isolates XDG_RUNTIME_DIR, so the default socket is hermetic

The suite isolated XDG_CONFIG/STATE/CACHE but not XDG_RUNTIME_DIR, so a
leg with a bug that dialed the DEFAULT socket reached the developer's
live daemon at /run/user/*/muxd.sock. Found by the push group's first
RED run: the not-yet-wired 'd upgrade HOST' ignored the host word, sent
an upgrade request to that live daemon, and only the version rule stood
between it and a Debug e2e build exec'd over real sessions. Isolated, a
stray default dial reads "nothing listening" instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/e2e_lib.sh

Old		New
@@ -146,7 +146,16 @@ defer_rm "$XDG_STATE_HOME"
146	# touch the developer's real ~/.cache/mux.	146	# touch the developer's real ~/.cache/mux.
147	XDG_CACHE_HOME="${TMPDIR:-/tmp}/mux-e2e-cache-$$"	147	XDG_CACHE_HOME="${TMPDIR:-/tmp}/mux-e2e-cache-$$"
148	defer_rm "$XDG_CACHE_HOME"	148	defer_rm "$XDG_CACHE_HOME"
149	export XDG_CONFIG_HOME XDG_STATE_HOME XDG_CACHE_HOME	149	# And XDG_RUNTIME_DIR, which is not a home but names the DEFAULT SOCKET:
		150	# every leg here spells --sock, but a leg with a bug in it does not — the
		151	# 16_push group's first RED run sent `d upgrade` to the developer's LIVE
		152	# daemon at /run/user/*/muxd.sock, and only the version rule stood between
		153	# that and an e2e Debug build exec'd over their sessions. Isolated, a stray
		154	# default dial reads "nothing listening" instead of someone's real daemon.
		155	XDG_RUNTIME_DIR="${TMPDIR:-/tmp}/mux-e2e-run-$$"
		156	mkdir -p "$XDG_RUNTIME_DIR"
		157	defer_rm "$XDG_RUNTIME_DIR"
		158	export XDG_CONFIG_HOME XDG_STATE_HOME XDG_CACHE_HOME XDG_RUNTIME_DIR
150	# ...and the same argument for $SHELL, which is not an XDG home but is read	159	# ...and the same argument for $SHELL, which is not an XDG home but is read
151	# the same way: every daemon this suite AUTO-STARTS gets no --shell flag and	160	# the same way: every daemon this suite AUTO-STARTS gets no --shell flag and
152	# resolves $SHELL, so without this the suite runs the developer's login	161	# resolves $SHELL, so without this the suite runs the developer's login