修复 LXC 内 microVM Runner 启动链路

scripts/microvm-runner-launch

@@ -39,7 +39,9 @@ trap cleanup EXIT INT TERM
 test -r "$base_image"
 test -r "$firmware"
 install -d -m 0700 "$state_root/instances" "$vm_dir"
-qemu-img create -q -f qcow2 -F qcow2 -b "$base_image" "$overlay"
+# Cloud Hypervisor cannot open qcow2 backing chains.  Keep each disposable
+# root disk flat; reflink-capable storage still makes this copy cheap.
+cp --reflink=auto --sparse=always "$base_image" "$overlay"
 
 cat >"$vm_dir/meta-data" <<EOF
 instance-id: $instance_id
@@ -48,7 +50,8 @@ EOF
 cat >"$vm_dir/user-data" <<EOF
 #cloud-config
 runcmd:
-  - [ /usr/local/libexec/gitea-microvm-guest-runner, "$token_url/token/$nonce", "$gitea_instance", "gitea-${instance_id%%-*}", "$runner_labels" ]
+  - [ sh, -c, "curl --fail --silent --show-error --retry 10 --retry-all-errors $token_url/assets/guest-assets.tar.gz | tar -xz -C /" ]
+  - [ /usr/local/libexec/gitea-microvm-guest-runner, "$token_url/token/$nonce", "$gitea_instance", "gitea-vm-${instance_id%%-*}", "$runner_labels" ]
 EOF
 cloud-localds "$seed" "$vm_dir/user-data" "$vm_dir/meta-data"
 
@@ -67,8 +70,8 @@ timeout --signal=TERM --kill-after=30s "$vm_timeout" "$cloud_hypervisor" \
     --firmware "$firmware" \
     --cpus "boot=$cpus" \
     --memory "size=$memory" \
-    --disk "path=$overlay" \
-    --disk "path=$seed,readonly=on" \
+    --disk "path=$overlay,image_type=qcow2" \
+    --disk "path=$seed,readonly=on,image_type=raw" \
     --net "tap=$tap,mac=$mac" \
     --serial "file=$serial" \
     --console off