[imlk0]

Problem

Since the disk-persist regression coverage landed (d83f85b), the fsck-140 rows of test-convert-persist fail on both alinux3 and alinux4 with:

qemu-img: <test>-persist-overlay.qcow2: Could not open 'output.qcow2': No such file or directory
qemu-system-x86_64: -drive file=/diskdir/<test>-persist-overlay.qcow2,...: Could not open '/diskdir/<test>-persist-overlay.qcow2': No such file or directory
[ERROR] Persist boot #1 failed

Root cause

test_qemu_boot_persist_second created the overlay in ${WORKDIR} but referenced the backing image by bare basename:

local overlay="${WORKDIR}/${test_name}-persist-overlay.qcow2"
( cd "${WORKDIR}" && qemu-img create -f qcow2 -F qcow2 -b "output.qcow2" ... >/dev/null )

The output image actually lives in ${WORKDIR}/${test_name}/output.qcow2, so qemu-img create failed to open the backing file. The error was swallowed (>/dev/null, no error check), the overlay was never created, and the first boot then failed on the missing overlay. The "relative backing filename resolves inside the container" mechanism the comment describes never actually worked.

Fix

Create the overlay in the same directory as the output image; the basename backing reference then resolves both at creation time and inside the QEMU boot container (which mounts that directory as /diskdir). Also check the qemu-img create result and fail loudly instead of discarding the error.

Verified locally:

• old command reproduces the exact CI error (Could not open 'output.qcow2' → overlay not created);
• new command creates the overlay, and inside ghcr.io/qemus/qemu:7.29 with the directory mounted at /diskdir, qemu-img info resolves the backing to /diskdir/output.qcow2;
• bash -n + shellcheck -S error clean.

Not addressed here (separate issues)

• fsck-141 rows fail with INTEGRITY AEAD ERROR — the real issue fde: disk-persist with integrity=true fails first boot when creating persistent dm-snapshot #141, being fixed separately.
• One alinux3 job flaked on a mirror metadata timeout during "Setup container environment" — transient, a re-run clears it.

[ostest-bot]

@imlk0 ，您好，您的请求已接收，请耐心等待结果。

[ostest-bot]

@imlk0 ，您好，未检测到有镜像需要构建，如需重新检测请评论 /start 。

[ostest-bot]

@imlk0 ，您好，您的请求已接收，请耐心等待结果。

[ostest-bot]

@imlk0 ，您好，未检测到有镜像需要构建，如需重新检测请评论 /start 。

[imlk0]

Superseded: master 6ce9c51 landed the same fix (overlay created next to the output image, bare-name backing reference, error-checked qemu-img create) independently. Closing this PR as redundant.