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fix: MINT-ZUSE says the stick was erased when it was (#168)

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failed() printed "MINT-ZUSE: failed -- nothing changed" on every failure
after YES, though by then gpt_write_one() had rewritten the stick's partition
table and the identity partition's first blocks had been zeroed.

gpt_write_one() now tells the two apart: GPT_EIO when its first write failed
(nothing written), GPT_PART when a later write or flush failed (the disk is
changed). MINT-ZUSE keeps "failed -- nothing changed" for GPT_EIO only, and
says "failed -- the stick was erased; Zuse not minted" for every failure
after the table is written. The marker is still written last.

Tested first, seen to fail: qemu_session.py mint_part_fail (writes fail only
at the identity partition's first sector, LBA 2048) -- "nothing changed",
logs/20261112-122132. After: mint_part_fail PASS; mint_fail (every write
fails) still "nothing changed", PASS; replace (the success path) PASS. Their
logs here. FABRIC-3 XLVIII.20.

Captain Bob, 2026-11-12: "start #168".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017RzZgrf7V7Zk2iczBXDRbm
This commit is contained in:
Claude
2026-11-12 12:41:36 +00:00
parent 7e30b4525e
commit 54311be18a
21 changed files with 102 additions and 19 deletions
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scripts/qemu_session.py
+32 -6
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@@ -87,6 +87,9 @@ the stick's, plan 2026-10-26-stick-1-screen-and-keyboard.md):
no ok> for 30 s; the new one added: the prompt
mint_fail the fixed screen; R, a stick whose writes all fail (blkdebug): "failed -- nothing
changed", the screen again; the old stick added: the prompt (Review Focus 4)
mint_part_fail as mint_fail, but only writes to the identity partition's first sector (LBA 2048)
fail: the GPT is written, then the mint fails -- "failed -- the stick was erased; Zuse
not minted", never "nothing changed" (#168); no replacement; the old stick: the prompt
system_pull_real logged in on her stick; the data stick pulled: hers let go first (no detach
refusal), session ended; the data stick replugged, hers still in: she is logged in
bam_flush --target qemu-stick --stick-gib 16: an Artemis block changed and SAVE-BUFFERS'd three
@@ -136,7 +139,7 @@ NO_ZUSE_MODES = {"gpt_zuse", "gpt_hotplug", "gpt_foreign", "gpt_bad_crc", "gpt_b
"screen_dark_until_login", "screen_console_after_login", "screen_dark_after_logout",
"kbd_typeahead", "stick_boot", "stick_v3", "stick_zuse", "screen_boot", "genesis",
"stick_genesis", "stick_grow", "stick_small", "bam_flush",
"zuse_stick_first", "fallback", "replace", "mint_fail", "system_pull_real"}
"zuse_stick_first", "fallback", "replace", "mint_fail", "mint_part_fail", "system_pull_real"}
label = a.label or f"{a.mode}-{a.arch}"
work = os.path.join(ROOT, "build", "qemu-session", label)
shutil.rmtree(work, ignore_errors=True)
@@ -188,7 +191,7 @@ if a.stick_gib:
make_args.append(f"STICK_GIB={a.stick_gib}")
if a.mode in ("stick_grow", "stick_small", "bam_flush"):
make_args.append("KERNEL_ARGS=--log-level=info") # the blk: disk lines the sizes are read from
if a.mode in ("zuse_stick_first", "fallback", "replace", "mint_fail", "system_pull_real"):
if a.mode in ("zuse_stick_first", "fallback", "replace", "mint_fail", "mint_part_fail", "system_pull_real"):
# a data stick made once into the session's directory: minted on, then booted again
dstick = os.path.join(work, "data.img")
subprocess.run(["make", "-f", "kernel/Makefile", f"ARCH={a.arch}", "datastick", f"DATASTICK_IMG={dstick}"],
@@ -417,12 +420,16 @@ def add_zuse(n, img=None, fail_sector0=False):
drive=f"zuse{n}", id=f"zusedev{n}")
def add_stick(n, img, port, fail_writes=False):
def add_stick(n, img, port, fail_writes=False, fail_sector=None):
"""A USB stick added over QMP on the xHCI controller's `port` (plan 2026-10-29-stick-5, Task 4);
with fail_writes, every write to it fails (blkdebug, EIO -- Task 5's mint_fail)."""
with fail_writes, every write to it fails (blkdebug, EIO -- Task 5's mint_fail); with fail_sector,
only writes touching that sector fail (#168's mint_part_fail)."""
f = {"driver": "file", "filename": img}
if fail_writes:
f = {"driver": "blkdebug", "image": f, "inject-error": [{"event": "none", "iotype": "write", "errno": 5}]}
elif fail_sector is not None:
f = {"driver": "blkdebug", "image": f,
"inject-error": [{"event": "none", "iotype": "write", "sector": fail_sector, "errno": 5}]}
qcmd("blockdev-add", driver="raw", **{"node-name": f"stick{n}"}, file=f)
qcmd("device_add", driver="usb-storage", bus="xhci0.0", port=str(port), drive=f"stick{n}", id=f"stickdev{n}")
@@ -728,7 +735,7 @@ elif m == "fallback":
check("no ok> on the screen", "ok> " not in text()[text().rfind("Zuse: session ended"):])
check("no fault", count(r"EXCEPTION|PANIC|panic") == 0)
elif m in ("replace", "mint_fail", "system_pull_real"):
elif m in ("replace", "mint_fail", "mint_part_fail", "system_pull_real"):
SCREEN0 = r"Zuse's stick is not here\."
old_img = os.path.join(work, "zuse-real.img")
subprocess.run(["truncate", "-s", "600M", old_img], check=True)
@@ -743,7 +750,7 @@ elif m in ("replace", "mint_fail", "system_pull_real"):
print("-- the second boot: the data stick alone", flush=True)
boot([x for x in make_args if x != "clean"])
check("POST: PASSED (second boot)", wait_for(r"POST: PASSED", 900))
if m in ("replace", "mint_fail"):
if m in ("replace", "mint_fail", "mint_part_fail"):
check("the fixed screen", wait_for(SCREEN0, 120), near=r"Artemis: |Zuse")
time.sleep(3)
p0 = count(r"MINT-ZUSE: plug in the stick for the real Zuse")
@@ -776,6 +783,25 @@ elif m in ("replace", "mint_fail", "system_pull_real"):
add_stick(4, new_img, 3)
check("the new one again: identity confirmed", wait_for(r"Zuse: identity confirmed from attached thumbdrive", 120, c))
check("the prompt", wait_for(PROMPT, 60))
elif m == "mint_part_fail":
# #168: the GPT is written (sectors 0-33 and the disk's end), the identity partition's
# first sector is not -- the stick has been changed when the mint fails
shots = count(SCREEN0)
add_stick(2, new_img, 3, fail_sector=2048)
wait_for(r"MINT-ZUSE: type YES to write it", 120)
type_line("YES")
check("MINT-ZUSE: failed -- the stick was erased; Zuse not minted",
wait_for(r"MINT-ZUSE: failed -- the stick was erased; Zuse not minted", 300), near=r"MINT-ZUSE")
check("never \"nothing changed\" for a stick that was written", count(r"failed -- nothing changed") == 0)
check("no replacement minted (none in this boot's log)", count(r"real Zuse minted") == 0)
check("the fixed screen again", wait_for(SCREEN0, 60, shots))
qcmd("device_del", id="stickdev2")
time.sleep(3)
qcmd("blockdev-del", **{"node-name": "stick2"})
c = count(r"Zuse: identity confirmed from attached thumbdrive")
add_stick(3, old_img, 3)
check("the old stick still logs in", wait_for(r"Zuse: identity confirmed from attached thumbdrive", 120, c))
check("the prompt", wait_for(PROMPT, 60))
else:
shots = count(SCREEN0)
add_stick(2, new_img, 3, fail_writes=True)