4 files changed, 37 insertions, 1 deletions

diff --git a/src/core/file_sys/nca_metadata.cpp b/src/core/file_sys/nca_metadata.cpp
index 52c78020c..f4a774675 100644
--- a/src/core/file_sys/nca_metadata.cpp
+++ b/src/core/file_sys/nca_metadata.cpp
@@ -45,6 +45,10 @@ CNMT::CNMT(CNMTHeader header_, OptionalHeader opt_header_,
 
 CNMT::~CNMT() = default;
 
+const CNMTHeader& CNMT::GetHeader() const {
+    return header;
+}
+
 u64 CNMT::GetTitleID() const {
     return header.title_id;
 }
diff --git a/src/core/file_sys/nca_metadata.h b/src/core/file_sys/nca_metadata.h
index c59ece010..68e463b5f 100644
--- a/src/core/file_sys/nca_metadata.h
+++ b/src/core/file_sys/nca_metadata.h
@@ -89,6 +89,7 @@ public:
          std::vector<ContentRecord> content_records_, std::vector<MetaRecord> meta_records_);
     ~CNMT();
 
+    const CNMTHeader& GetHeader() const;
     u64 GetTitleID() const;
     u32 GetTitleVersion() const;
     TitleType GetType() const;
diff --git a/src/core/file_sys/registered_cache.cpp b/src/core/file_sys/registered_cache.cpp
index f70adab82..e33b00d89 100644
--- a/src/core/file_sys/registered_cache.cpp
+++ b/src/core/file_sys/registered_cache.cpp
@@ -9,6 +9,7 @@
 #include "common/fs/path_util.h"
 #include "common/hex_util.h"
 #include "common/logging/log.h"
+#include "common/scope_exit.h"
 #include "core/crypto/key_manager.h"
 #include "core/file_sys/card_image.h"
 #include "core/file_sys/common_funcs.h"
@@ -625,7 +626,7 @@ InstallResult RegisteredCache::InstallEntry(const NSP& nsp, bool overwrite_if_ex
             nca->GetTitleId() != title_id) {
             // Create fake cnmt for patch to multiprogram application
             const auto sub_nca_result =
-                InstallEntry(*nca, TitleType::Update, overwrite_if_exists, copy);
+                InstallEntry(*nca, cnmt.GetHeader(), record, overwrite_if_exists, copy);
             if (sub_nca_result != InstallResult::Success) {
                 return sub_nca_result;
             }
@@ -672,6 +673,31 @@ InstallResult RegisteredCache::InstallEntry(const NCA& nca, TitleType type,
     return RawInstallNCA(nca, copy, overwrite_if_exists, c_rec.nca_id);
 }
 
+InstallResult RegisteredCache::InstallEntry(const NCA& nca, const CNMTHeader& base_header,
+                                            const ContentRecord& base_record,
+                                            bool overwrite_if_exists, const VfsCopyFunction& copy) {
+    const CNMTHeader header{
+        .title_id = nca.GetTitleId(),
+        .title_version = base_header.title_version,
+        .type = base_header.type,
+        .reserved = {},
+        .table_offset = 0x10,
+        .number_content_entries = 1,
+        .number_meta_entries = 0,
+        .attributes = 0,
+        .reserved2 = {},
+        .is_committed = 0,
+        .required_download_system_version = 0,
+        .reserved3 = {},
+    };
+    const OptionalHeader opt_header{0, 0};
+    const CNMT new_cnmt(header, opt_header, {base_record}, {});
+    if (!RawInstallYuzuMeta(new_cnmt)) {
+        return InstallResult::ErrorMetaFailed;
+    }
+    return RawInstallNCA(nca, copy, overwrite_if_exists, base_record.nca_id);
+}
+
 bool RegisteredCache::RemoveExistingEntry(u64 title_id) const {
     bool removed_data = false;
 
diff --git a/src/core/file_sys/registered_cache.h b/src/core/file_sys/registered_cache.h
index bd7f53eaf..64815a845 100644
--- a/src/core/file_sys/registered_cache.h
+++ b/src/core/file_sys/registered_cache.h
@@ -24,6 +24,7 @@ enum class NCAContentType : u8;
 enum class TitleType : u8;
 
 struct ContentRecord;
+struct CNMTHeader;
 struct MetaRecord;
 class RegisteredCache;
 
@@ -169,6 +170,10 @@ public:
     InstallResult InstallEntry(const NCA& nca, TitleType type, bool overwrite_if_exists = false,
                                const VfsCopyFunction& copy = &VfsRawCopy);
 
+    InstallResult InstallEntry(const NCA& nca, const CNMTHeader& base_header,
+                               const ContentRecord& base_record, bool overwrite_if_exists = false,
+                               const VfsCopyFunction& copy = &VfsRawCopy);
+
     // Removes an existing entry based on title id
     bool RemoveExistingEntry(u64 title_id) const;