Preserve information whether attachments are executable.

This is relevant for testing tools which are often uploaded as
attachments for interactive problems. When we download the samples (via
the web interface or API), we should mark these files as executable iff
they were executable when uploading.

webapp/migrations/Version20240917113927.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20240917113927 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Adding executable bit to problem attachments.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE problem_attachment_content ADD is_executable TINYINT(1) DEFAULT 0 NOT NULL COMMENT \'Whether this file gets an executable bit.\'');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE problem_attachment_content DROP is_executable');
+    }
+
+    public function isTransactional(): bool
+    {
+        return false;
+    }
+}

webapp/src/Entity/ProblemAttachmentContent.php

@@ -3,6 +3,7 @@
 namespace App\Entity;
 
 use Doctrine\ORM\Mapping as ORM;
+use JMS\Serializer\Annotation as Serializer;
 
 #[ORM\Entity]
 #[ORM\Table(options: [
@@ -25,6 +26,10 @@ class ProblemAttachmentContent
     #[ORM\Column(type: 'blobtext', options: ['comment' => 'Attachment content'])]
     private string $content;
 
+    #[ORM\Column(options: ['comment' => 'Whether this file gets an executable bit.', 'default' => 0])]
+    #[Serializer\Exclude]
+    private bool $isExecutable = false;
+
     public function getAttachment(): ProblemAttachment
     {
         return $this->attachment;
@@ -48,4 +53,15 @@ public function setContent(string $content): self
 
         return $this;
     }
+
+    public function setIsExecutable(bool $isExecutable): ProblemAttachmentContent
+    {
+        $this->isExecutable = $isExecutable;
+        return $this;
+    }
+
+    public function isExecutable(): bool
+    {
+        return $this->isExecutable;
+    }
 }

webapp/src/Service/DOMJudgeService.php

@@ -892,6 +892,14 @@ public function getSamplesZipForContest(Contest $contest): StreamedResponse
             foreach ($problem->getProblem()->getAttachments() as $attachment) {
                 $filename = sprintf('%s/attachments/%s', $problem->getShortname(), $attachment->getName());
                 $zip->addFromString($filename, $attachment->getContent()->getContent());
+                if ($attachment->getContent()->isExecutable()) {
+                    // 100755 = regular file, executable
+                    $zip->setExternalAttributesName(
+                        $filename,
+                        ZipArchive::OPSYS_UNIX,
+                        octdec('100755') << 16
+                    );
+                }
             }
         }
 

webapp/src/Service/ImportProblemService.php

@@ -539,6 +539,14 @@ public function importZippedProblem(
                 continue;
             }
 
+            // In doubt make files executable, but try to read it from the zip file.
+            $executableBit = true;
+            if ($zip->getExternalAttributesIndex($j, $opsys, $attr)
+                && $opsys==ZipArchive::OPSYS_UNIX
+                && (($attr >> 16) & 0100) === 0) {
+                $executableBit = false;
+            }
+
             $name = basename($filename);
 
             $fileParts = explode('.', $name);
@@ -558,6 +566,10 @@ public function importZippedProblem(
                     $messages['info'][] = sprintf("Updated attachment '%s'", $name);
                     $numAttachments++;
                 }
+                if ($executableBit !== $attachmentContent->isExecutable()) {
+                    $attachmentContent->setIsExecutable($executableBit);
+                    $messages['info'][] = sprintf("Updated executable bit of attachment '%s'", $name);
+                }
             } else {
                 $attachment = new ProblemAttachment();
                 $attachmentContent = new ProblemAttachmentContent();
@@ -567,7 +579,9 @@ public function importZippedProblem(
                     ->setType($type)
                     ->setContent($attachmentContent);
 
-                $attachmentContent->setContent($content);
+                $attachmentContent
+                    ->setContent($content)
+                    ->setIsExecutable($executableBit);
 
                 $this->em->persist($attachment);