runtimes: fix path translation when using --device-dict

[roxell]

In device-dict mode the bind uses dispatcher_download_dir on both the host and the container. The docker wrapper rewrote mount sources to tmpdir/dispatcher/tmp instead.

This sent the wrong path to the host docker daemon. The bind failed with:

bind source path does not exist: ...

Set _device_dict_volume to dispatcher_download_dir so the wrapper rewrite becomes a no-op in this mode.

Also create the dispatcher_download_dir on the host before binding it.

[bhcopeland]

I don't see this issue on my side. Strange, what's your steps here to reproduce?

[roxell]

I don't see this issue on my side. Strange, what's your steps here to reproduce?

This is the failure.

- {"dt": "2026-05-18T14:49:02.933176", "lvl": "error", "msg": "Unable to run: ['docker', 'run', '--add-host=lava-worker.internal:host-gateway', '--volume=/usr/bin/laacli:/usr/bin/laacli:ro', '--volume=/usr/bin/lsibcli:/usr/bin/lsibcli:ro', '--volume=/run/dbus/system_bus_socket:/run/dbus/system_bus_socket:rw', '--device=/dev/bus/usb', '--rm', '--init', '--workdir=/lava-downloads', '--device=/dev/kvm', '--mount=type=bind,source=/var/lib/lava/dispatcher/tmp/tuxrun-v86mdj1g-1/downloads/common,destination=/lava-downloads', 'linaro/kir:20260511', '/lava-downloads/postprocess.sh']"}
- {"dt": "2026-05-18T14:49:02.934477", "lvl": "exception", "msg": "Post-processing of downloads failed"}
- {"dt": "2026-05-18T14:49:02.935727", "lvl": "debug", "msg": "end: 1.6 download-postprocess-docker (duration 00:00:01) [common]"}
- {"dt": "2026-05-18T14:49:02.937735", "lvl": "results", "msg": {"definition": "lava", "namespace": "common", "case": "download-postprocess-docker", "level": "1.6", "duration": "0.53", "result": "fail", "extra": {"fail": "Post-processing of downloads failed"}}}
- {"dt": "2026-05-18T14:49:02.939313", "lvl": "exception", "msg": "Post-processing of downloads failed"}

cmdline

/root/.local/bin/uv run --no-cache --with /root/src/tuxlava --with /root/src/tuxrun tuxrun --runtime docker --device fastboot-e850-96 --log-file - --kernel /path/to/kernel/build/Image.gz --rootfs https://storage.tuxboot.com/debian/trixie/arm64/rootfs.tar.xz --modules /path/to/kernel/build/modules.tar.xz /usr/ --dtb /path/to/kernel/build/dtbs/exynos/exynos850-e850-96.dtb --device-dict /root/src/tuxlava/test/device_dicts/fastboot-e850-96.jinja2 --parameters DISPATCHER_IP=198.18.0.1 --parameters ROOTFS_PARTITION=1 --boot-args=rw --save-outputs --lava-definition --debug --image tuxrun-dispatcher:0e1a18053672-dirty-d402da995a8a-arm64

[bhcopeland]

Debugging this I see the issue is down to fastboot. Also be good to catch podman, I threw together a patch: https://gist.github.com/bhcopeland/8cc71b16bd93026b26faabd2d46e9565

[roxell]

Debugging this I see the issue is down to fastboot. Also be good to catch podman, I threw together a patch: https://gist.github.com/bhcopeland/8cc71b16bd93026b26faabd2d46e9565

Great, send that as a PR and I review it, and we can close this one.