tests: nvidia suite (fake NVIDIA PC), controller block, name-based menu rows; get-iso.sh uses CachyOS's own mirror and resumes; notes

share/vmtest/nvidia/10-n1-menu.sh

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+# N1: an NVIDIA PC (fake GPU): the menu hides the SteamOS conversion and its gamescope options, shows Gaming on NVIDIA, its
+# Big Picture option and Single user mode. Covers TESTPLAN N1.
+fake_nvidia
+out="$(sf --defaults --list)"
+ids="$(python3 -c 'import json,sys; d=json.load(sys.stdin); print(" ".join(sorted(i["id"] for i in d)))' <<< "$out" 2>/dev/null)"
+[[ -n "$ids" ]] && pass "N1 --defaults --list is valid JSON: $ids" || { fail "N1 --defaults --list is not JSON: $(echo "$out" | head -c 300)"; exit 0; }
+for i in nvidia bigpicture single; do [[ " $ids " == *" $i "* ]] && pass "N1 $i is offered" || fail "N1 $i is missing"; done
+for i in gaming boot glyphs; do [[ " $ids " == *" $i "* ]] && fail "N1 $i is offered on an NVIDIA PC" || pass "N1 $i is hidden"; done
+python3 -c '
+import json,sys
+d={i["id"]:i for i in json.load(sys.stdin)}
+ok = d["bigpicture"]["parent"]=="nvidia" and d["nvidia"]["on"] and d["bigpicture"]["on"] and d["single"]["on"]
+sys.exit(0 if ok else 1)' <<< "$out" && pass "N1 Big Picture is a sub-option of Gaming on NVIDIA, all three preselected" || fail "N1 parent or preselection wrong"
+st="$(sf --backend status)"
+python3 -c 'import json,sys; d=json.load(sys.stdin); ids=[i["id"] for i in d.get("items",d)]; sys.exit(1 if "gaming" in ids else 0)' <<< "$st" 2>/dev/null && pass "N1 --backend status (the app) has no conversion row" || fail "N1 --backend status lists the conversion"
+# Without a NVIDIA GPU nothing changes: the conversion is offered, Gaming on NVIDIA is not.
+out2="$(NVIDIA_DRM_DIR=/nonexistent sf --defaults --list)"
+python3 -c 'import json,sys; ids=[i["id"] for i in json.load(sys.stdin)]; sys.exit(0 if "gaming" in ids and "nvidia" not in ids and "bigpicture" not in ids else 1)' <<< "$out2" && pass "N1 no NVIDIA GPU: the conversion is offered, Gaming on NVIDIA is not" || fail "N1 no-NVIDIA menu wrong"