stack: row 190 round 2 (#1688): T56 after row 189's T55, N1 copy and usage, N3 Console comment, N5 and N6

Filbert's round 1 (comment 29634) and Sage's N3 ruling (sage-1474).
Row 189 also named a test T55, so row 190's is T56. webui-service.sh copy
refuses --instance like stack-copy.sh copy; TOOLS.md shows --instance on
the bus and discord usage. A named Console unit's comment names
MOSAIC_CONFIG, and the default keeps the template's line. check
--instance needs the wrapper's MOSAIC_CONFIG line. TOOLS.md says an
existing directory keeps its mode.

scripts/instance.sh

@@ -35,8 +35,9 @@
 #                      in a unit template: the default deletes the
 #                      @CONFIG_ENV@ line, so its render is byte-identical to
 #                      the template before row 190; NAME gets a comment and
-#                      Environment=MOSAIC_CONFIG=<config>, and " [NAME]" after
-#                      the Description
+#                      Environment=MOSAIC_CONFIG=<config>, " [NAME]" after
+#                      the Description, and the Console comment's "sets no
+#                      MOSAIC_*" says it sets MOSAIC_CONFIG (Sage, N3)
 #
 # Also set: MOSAIC_INSTANCE (dev or NAME), MOSAIC_INSTANCE_CONFIG,
 # MOSAIC_INSTANCE_CONFIG_DIR, MOSAIC_INSTANCE_DATA_ROOT (empty when no flag
@@ -105,6 +106,7 @@ instance_select() {
         -e "s|^@CONFIG_ENV@\$|# Stack instance $MOSAIC_INSTANCE (row 190): the system config its processes read.\\nEnvironment=MOSAIC_CONFIG=$MOSAIC_INSTANCE_CONFIG|"
         -e "s|@SESSION_ENV@|$SESSION_ENV|g"
         -e "s|^\\(Description=.*\\)\$|\\1 [$MOSAIC_INSTANCE]|"
+        -e 's|The unit sets no MOSAIC_\*, CLAUDE\*, CODEX\* or PI_\* variable\.$|The unit sets MOSAIC_CONFIG and no other MOSAIC_*, CLAUDE*, CODEX* or PI_* variable.|'
     )
 }
 

scripts/stack-copy.sh

@@ -117,6 +117,8 @@ check() {
   line="$(tail -n 1 "$wfile")"
   path="${line#exec \"}";path="${path%\" \"\$@\"}"
   if [ "$line" = "exec \"$path\" \"\$@\"" ] && [[ "$path" == */scripts/mosaic ]];then cli="${path%/scripts/mosaic}";fi
+  # A named wrapper must also carry NAME's config, as wrapper_instance writes it.
+  if [ -n "$MOSAIC_UNIT_SUFFIX" ] && [ "$cli" != absent ] && [ "$(sed -n '4p' "$wfile")" != "export MOSAIC_CONFIG='$MOSAIC_INSTANCE_CONFIG'" ];then cli="$cli (MOSAIC_CONFIG mismatch)";fi
  fi
  printf 'bus: %s\nConsole: %s\nCLI: %s\n' "$bus" "$console" "$cli"
  [[ "$bus" == "$COPIES/"* ]] && [[ "${bus#"$COPIES/"}" =~ ^[0-9a-f]{40}$ ]] && [ -f "$bus/scripts/mosaic" ] && [ "$bus" = "$console" ] && [ "$bus" = "$cli" ]

scripts/webui-service.sh

@@ -71,7 +71,9 @@
 # and render and install need --port, which may not be 7330, 7332 or 7333
 # (exit 4, port-reserved). For every instance, install refuses a --port or
 # --tester-port that another installed Console unit in the unit directory
-# already takes (port-claimed). See scripts/instance.sh.
+# already takes (port-claimed). copy refuses --instance (exit 4), as
+# stack-copy.sh copy does: every instance shares the copies. See
+# scripts/instance.sh.
 #
 # Exit codes: 0 ok, 1 operation failed, 3 the data root is claimed by another
 # instance or not claimed (scripts/instance.sh), 4 usage.
@@ -82,10 +84,14 @@ TEMPLATE="$REPO/packages/webui/systemd/mosaic-webui.service.in"
 . "$REPO/scripts/instance.sh"
 instance_args "$@"
 set -- ${INSTANCE_ARGS[@]+"${INSTANCE_ARGS[@]}"}
+if [ "${1:-}" = copy ] && [ -n "$INSTANCE_FLAG" ]; then
+    echo "webui-service: copy takes no --instance; every instance shares the copies" >&2
+    exit 4
+fi
 instance_select
 UNIT_NAME="$CONSOLE_UNIT"
 BUS_UNIT_PREFIX="${BUS_TEMPLATE%.service}"
-USAGE="usage: scripts/webui-service.sh [--instance NAME] copy COMMIT [--copies DIR] [--allow-worktree] | render [--copy ID [--copies DIR]] [FLAGS] | install --copy ID [--copies DIR] [--dir DIR] [--no-reload] [--allow-worktree] [FLAGS] | uninstall [--dir DIR] [--no-reload] | status [--dir DIR]
+USAGE="usage: scripts/webui-service.sh copy COMMIT [--copies DIR] [--allow-worktree] | [--instance NAME] render [--copy ID [--copies DIR]] [FLAGS] | install --copy ID [--copies DIR] [--dir DIR] [--no-reload] [--allow-worktree] [FLAGS] | uninstall [--dir DIR] [--no-reload] | status [--dir DIR]
   FLAGS: [--port N] [--business ID] [--board URL] [--sso [--send] | --public-host NAME --auth-header HEADER --allow-user ID [--send]] [--tester-port N] [--proof-header NAME --proof-file PATH]
   --tester-port: 1024..65535, different from --port and never 7332; loopback tester listener.
   --allow-worktree is for the tests only: copy and install otherwise refuse outside the canonical checkout."