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test: boot a per-run copy of the USB image — runs must not inherit leftovers 

The guest mutates its boot volume (fat tests create files, the logger
writes /var/log) and QEMU is hard-killed after a match, so booting the
build artifact in place let one run's leftovers fail the next — a stale
TESTDIR tripping the mkdir-duplicate refusal was the lone 87/88 failure
in an otherwise green suite — and dirtied the build cache's own output.
Each case now boots a fresh copy in the work directory.
This commit is contained in:
Daniel Samson 2026-07-21 20:37:59 +01:00
parent d8cf533b73
commit 4091ea6912
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1 changed files with 8 additions and 1 deletions
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9
test/qemu_test.py
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@ -734,7 +734,14 @@ def run_case(arch, case):
# The bootable FAT32 USB image the build produced (tools/make-fat-image.py),
# presented to the guest as a usb-storage device (see qemu_args).
boot_volume = os.path.join(REPO, "zig-out", "danos-usb.img")
# Boot a per-run COPY of the image: the guest MUTATES its boot volume (the
# fat tests create/delete files; the logger writes /var/log), and QEMU is
# hard-killed after a match — booting the build artifact in place let one
# run's leftovers fail the next (a stale TESTDIR trips the mkdir-duplicate
# refusal) and dirtied the build cache's own output.
built_volume = os.path.join(REPO, "zig-out", "danos-usb.img")
boot_volume = os.path.join(WORK, "boot-volume.img")
shutil.copy(built_volume, boot_volume)
vars_fd = os.path.join(WORK, "vars.fd")
shutil.copy(arch["ovmf_vars"], vars_fd)
serial = os.path.join(WORK, "serial.log")