Add --save-not-found option

doc/manual-src/en/aria2c.rst

@@ -1348,6 +1348,13 @@ Advanced Options
   BitTorrent seeding which is recognized as completed state.
   Default: ``false``
 
+.. option:: --save-not-found[=true|false]
+
+  Save download with :option:`--save-session <--save-session>` option
+  even if the file was not found on the server. This option also saves
+  control file in that situations.
+  Default: ``true``
+
 .. option:: --gid=<GID>
 
   Set GID manually. aria2 identifies each download by the ID called

src/OptionHandlerFactory.cc

@@ -343,6 +343,17 @@ std::vector<OptionHandler*> OptionHandlerFactory::createOptionHandlers()
     op->setChangeOptionForReserved(true);
     handlers.push_back(op);
   }
+  {
+    OptionHandler* op(new BooleanOptionHandler(
+        PREF_SAVE_NOT_FOUND, TEXT_SAVE_NOT_FOUND, A2_V_TRUE,
+        OptionHandler::OPT_ARG));
+    op->addTag(TAG_ADVANCED);
+    op->setInitialOption(true);
+    op->setChangeOption(true);
+    op->setChangeGlobalOption(true);
+    op->setChangeOptionForReserved(true);
+    handlers.push_back(op);
+  }
   {
     OptionHandler* op(
         new BooleanOptionHandler(PREF_FORCE_SEQUENTIAL, TEXT_FORCE_SEQUENTIAL,

src/SessionSerializer.cc

@@ -286,6 +286,10 @@ bool SessionSerializer::save(IOFile& fp) const
       case error_code::IN_PROGRESS:
         save = saveInProgress_;
         break;
+      case error_code::RESOURCE_NOT_FOUND:
+      case error_code::MAX_FILE_NOT_FOUND:
+        save = dr->option->getAsBool(PREF_SAVE_NOT_FOUND);
+        break;
       default:
         save = saveError_;
         break;

src/prefs.cc

@@ -349,6 +349,8 @@ PrefPtr PREF_STOP_WITH_PROCESS = makePref("stop-with-process");
 PrefPtr PREF_ENABLE_MMAP = makePref("enable-mmap");
 // value: true | false
 PrefPtr PREF_FORCE_SAVE = makePref("force-save");
+// value: true | false
+PrefPtr PREF_SAVE_NOT_FOUND = makePref("save-not-found");
 // value: 1*digit
 PrefPtr PREF_DISK_CACHE = makePref("disk-cache");
 // value: string

src/prefs.h

@@ -302,6 +302,8 @@ extern PrefPtr PREF_STOP_WITH_PROCESS;
 extern PrefPtr PREF_ENABLE_MMAP;
 // value: true | false
 extern PrefPtr PREF_FORCE_SAVE;
+// value: true | false
+extern PrefPtr PREF_SAVE_NOT_FOUND;
 // value: 1*digit
 extern PrefPtr PREF_DISK_CACHE;
 // value: string

src/usage_text.h

@@ -971,6 +971,11 @@
     "                              situations. This may be useful to save\n" \
     "                              BitTorrent seeding which is recognized as\n" \
     "                              completed state.")
+#define TEXT_SAVE_NOT_FOUND                         \
+  _(" --save-not-found[=true|false] Save download with --save-session option even\n" \
+    "                              if the file was not found on the server. This\n" \
+    "                              option also saves control file in that\n" \
+    "                              situations.")
 #define TEXT_DISK_CACHE                         \
   _(" --disk-cache=SIZE            Enable disk cache. If SIZE is 0, the disk cache\n" \
     "                              is disabled. This feature caches the downloaded\n" \