fix(os): regenerate indexes after merging module stages

Author: kvinwang

os/mkosi/build.sh

@@ -27,6 +27,9 @@ build_one() {
   rm -rf "$work" "$out"; mkdir -p "$stage" "$kstage" "$out"
   "$SELF/scripts/build-components.sh" "${component_cache_args[@]}" \
     "$work" "$stage" "$kstage" "$flavor"
+  # NVIDIA and ZFS are assembled from independent cacheable stage trees.
+  # Regenerate indexes only after every module tree has been merged.
+  depmod -b "$kstage" "$KERNEL_VERSION-dstack"
   if [[ $flavor == prod ]]; then
     # Yocto splits module DWARF into debug packages which are not shipped in
     # the production image. Keep BTF and loadable ELF metadata, but do not put

os/mkosi/tests/acceptance.sh

@@ -25,6 +25,7 @@ grep -q 'build-ovmf.sh' "$D/scripts/build-components.sh"
 grep -q 'fbe0805b2091393406952e84724188f8c1941837' "$D/scripts/build-ovmf.sh"
 grep -q 'AmdSev/AmdSevX64.dsc' "$D/scripts/build-ovmf.sh"
 grep -q 'objcopy --strip-debug' "$D/build.sh"
+grep -q 'depmod -b.*KERNEL_VERSION-dstack' "$D/build.sh"
 grep -q 'prune-rootfs.sh' "$D/build.sh"
 ! grep -q '^[[:space:]]*ovmf$' "$D/mkosi.conf"
 grep -q '"firmware_sev":"files/ovmf-sev.fd"' "$D/scripts/make-release-artifacts.sh"