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fix(orchestrator): create /dev/fuse for dockerd; runner parity refinements #164

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Merged
Bnjoroge1 merged 1 commit into from
Aug 20, 2026
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fix(orchestrator): create /dev/fuse for dockerd; runner parity refinements #164

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21 changes: 18 additions & 3 deletions crates/preloop-orchestrator/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1304,15 +1304,30 @@ fn docker_start_command() -> Vec<String> {
mkdir -p {DOCKER_DATA_ROOT}; \
modprobe overlay >/dev/null 2>&1 || true; \
modprobe fuse >/dev/null 2>&1 || true; \
# The krunfw guest kernel has fuse built in, but the VM boots
# /dev as a plain tmpfs with only the image's baked nodes, so
# /dev/fuse is missing and fuse-overlayfs (dockerd's fallback
# when its overlay probe fails) dies with 'fuse: device not
# found'). Create the node when the kernel supports fuse; dockerd
# then auto-picks fuse-overlayfs (CoW) on kernels whose overlay
# probe fails, and overlay2 on stock kernels where it succeeds.
if grep -q fuse /proc/filesystems; then \
[ -e /dev/fuse ] || mknod /dev/fuse c 10 229; \
fi; \
mkdir -p /tmp/.preloop-ovprobe; \
if mount -t overlay overlay -o lowerdir=/tmp:/usr /tmp/.preloop-ovprobe 2>/dev/null; then \
umount /tmp/.preloop-ovprobe 2>/dev/null || true; \
DRIVER=overlay2; \
DRIVER=; \
else \
DRIVER=vfs; \
# Overlay unusable (the krunfw kernel rejects the probe mount
# with EINVAL). Only force vfs when fuse is unavailable too —
# otherwise fuse-overlayfs auto-detects and works.
[ -e /dev/fuse ] || DRIVER=vfs; \
fi; \
rmdir /tmp/.preloop-ovprobe 2>/dev/null || true; \
printf '{{\"data-root\":\"{DOCKER_DATA_ROOT}\",\"storage-driver\":\"%s\"}}\\n' \"$DRIVER\" > /etc/docker/daemon.json; \
if [ -n \"$DRIVER\" ]; then \
printf '{{\"data-root\":\"{DOCKER_DATA_ROOT}\",\"storage-driver\":\"%s\"}}\\n' \"$DRIVER\" > /etc/docker/daemon.json; \
fi; \
start_dockerd() {{ \
rm -f /var/run/docker.pid; \
dockerd >/var/log/dockerd.log 2>&1 & \
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