FIX: zip plugin - VMS swap file: use archive dir (with /tmp fallback); unlink on POSIX after open to prevent crash-orphan temp files

plugins/wcx/zip/src/fparchive/abbrotlityp.pas

@@ -270,6 +270,7 @@ begin
     end
     else begin
       FTarStream := TAbVirtualMemoryStream.Create;
+      TAbVirtualMemoryStream(FTarStream).SwapFileDirectory := ExtractFileDir(FArchiveName);
       { Decompress and send to tar LoadArchive }
       DecompressToStream(FTarStream);
       SwapToTar;

plugins/wcx/zip/src/fparchive/abbzip2typ.pas

@@ -300,6 +300,7 @@ begin
     end
     else begin
       FTarStream := TAbVirtualMemoryStream.Create;
+      TAbVirtualMemoryStream(FTarStream).SwapFileDirectory := ExtractFileDir(FArchiveName);
       { Decompress and send to tar LoadArchive }
       DecompressToStream(FTarStream);
       SwapToTar;

plugins/wcx/zip/src/fparchive/abgztyp.pas

@@ -1097,6 +1097,7 @@ begin
           end
           else begin
             FTarStream := TAbVirtualMemoryStream.Create;
+            TAbVirtualMemoryStream(FTarStream).SwapFileDirectory := ExtractFileDir(FArchiveName);
             GzHelp.ReadHeader;
             repeat
               GzHelp.ExtractItemData(FTarStream);

plugins/wcx/zip/src/fparchive/ablzmatyp.pas

@@ -172,6 +172,7 @@ begin
   FLzmaStream  := FStream;
   FLzmaItem    := FItemList;
   FTarStream   := TAbVirtualMemoryStream.Create;
+  TAbVirtualMemoryStream(FTarStream).SwapFileDirectory := ExtractFileDir(aArchiveName);
   FTarList     := TAbArchiveList.Create(True);
 end;
 { -------------------------------------------------------------------------- }

plugins/wcx/zip/src/fparchive/abutils.pas

@@ -517,10 +517,21 @@ var
   hFile: System.THandle;
   TempPath : String;
 begin
+  { Default to the system temp directory; upgrade to Dir if it exists and is
+    writable.  Using the archive's own directory avoids /tmp tmpfs size limits
+    when packing large archives. }
+  TempPath := AbGetTempDirectory;
   if mbDirectoryExists(Dir) then
-    TempPath := IncludeTrailingPathDelimiter(Dir)
-  else
-    TempPath := AbGetTempDirectory;
+  begin
+    { Quick writeability probe: try to create and immediately remove a file. }
+    hFile := mbFileCreate(IncludeTrailingPathDelimiter(Dir) + '~probe');
+    if hFile <> feInvalidHandle then
+    begin
+      FileClose(hFile);
+      mbDeleteFile(IncludeTrailingPathDelimiter(Dir) + '~probe');
+      TempPath := IncludeTrailingPathDelimiter(Dir);
+    end;
+  end;
 
   Result := GetTempName(TempPath + 'VMS');
 

plugins/wcx/zip/src/fparchive/abvmstrm.pas

@@ -435,8 +435,16 @@ begin
     if (vmsSwapHandle <= 0) then begin
       vmsSwapHandle := 0;
       mbDeleteFile(vmsSwapFileName);
-      raise EAbVMSErrorOpenSwap.Create( vmsSwapFileName );             
+      raise EAbVMSErrorOpenSwap.Create( vmsSwapFileName );
     end;
+    { On POSIX systems, unlink the file immediately after opening so that
+      the kernel reclaims disk space automatically if the process crashes
+      before the destructor runs.  The handle remains valid for read/write
+      until it is closed normally by vmsSwapFileDestroy. }
+    {$IF DEFINED(UNIX)}
+    mbDeleteFile(vmsSwapFileName);
+    vmsSwapFileName := '';
+    {$ENDIF}
     vmsSwapFileSize := 0;
   end;
 end;
@@ -445,7 +453,10 @@ procedure TAbVirtualMemoryStream.vmsSwapFileDestroy;
 begin
   if (vmsSwapHandle <> 0) then begin
     FileClose(vmsSwapHandle);
-    mbDeleteFile(vmsSwapFileName);
+    { On POSIX the file was already unlinked in vmsSwapFileCreate, so
+      vmsSwapFileName is empty and there is nothing left to delete. }
+    if (vmsSwapFileName <> '') then
+      mbDeleteFile(vmsSwapFileName);
     vmsSwapHandle := 0;
   end;
 end;

plugins/wcx/zip/src/fparchive/abxztyp.pas

@@ -293,6 +293,7 @@ begin
     end
     else begin
       FTarStream := TAbVirtualMemoryStream.Create;
+      TAbVirtualMemoryStream(FTarStream).SwapFileDirectory := ExtractFileDir(FArchiveName);
       { Decompress and send to tar LoadArchive }
       DecompressToStream(FTarStream);
       SwapToTar;

plugins/wcx/zip/src/fparchive/abzstdtyp.pas

@@ -291,6 +291,7 @@ begin
     end
     else begin
       FTarStream := TAbVirtualMemoryStream.Create;
+      TAbVirtualMemoryStream(FTarStream).SwapFileDirectory := ExtractFileDir(FArchiveName);
       { Decompress and send to tar LoadArchive }
       DecompressToStream(FTarStream);
       SwapToTar;