From 90dc166fe600c4c76f35da5e1890756c8cc3eb01 Mon Sep 17 00:00:00 2001
From: Andreas Wunderwald <wundii@gmail.com>
Date: Thu, 21 May 2026 09:26:34 +0200
Subject: [PATCH 1/2] feat: add support for tmpfs mounts in GenericContainer

---
 src/Container/GenericContainer.php         | 16 +++++++++++++++-
 src/Container/TestContainer.php            |  2 ++
 tests/Integration/GenericContainerTest.php | 13 +++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/Container/GenericContainer.php b/src/Container/GenericContainer.php
index 5a9d113..45d3998 100644
--- a/src/Container/GenericContainer.php
+++ b/src/Container/GenericContainer.php
@@ -96,6 +96,9 @@ class GenericContainer implements TestContainer
      */
     protected array $mounts = [];
 
+    /** @var array<string, string> */
+    protected array $tmpfs = [];
+
     /** @var array<string> List of exposed ports in the format ['8080/tcp'] */
     protected array $exposedPorts = [];
 
@@ -221,6 +224,13 @@ public function withMount(string $localPath, string $containerPath): static
         return $this;
     }
 
+    public function withTmpfs(string $containerPath, string $options = 'rw,noexec'): static
+    {
+        $this->tmpfs[$containerPath] = $options;
+
+        return $this;
+    }
+
     /**
      * Add ports to be exposed by the Docker container.
      * This method accepts multiple inputs: single port, multiple ports, or ports with specific protocols
@@ -458,7 +468,7 @@ protected function createHostConfig(): ?HostConfig
          * the API will throw ContainerCreateBadRequestException: bad parameter.
          * Until it will be checked and fixed, we just return null if these properties are not set.
          * */
-        if ($this->exposedPorts === [] && !$this->isPrivileged && $this->mounts === []) {
+        if ($this->exposedPorts === [] && !$this->isPrivileged && $this->mounts === [] && $this->tmpfs === []) {
             return null;
         }
 
@@ -479,6 +489,10 @@ protected function createHostConfig(): ?HostConfig
             $hostConfig->setMounts($this->mounts);
         }
 
+        if ($this->tmpfs !== []) {
+            $hostConfig->setTmpfs($this->tmpfs);
+        }
+
         return $hostConfig;
     }
 
diff --git a/src/Container/TestContainer.php b/src/Container/TestContainer.php
index 43b68ed..5b16baf 100644
--- a/src/Container/TestContainer.php
+++ b/src/Container/TestContainer.php
@@ -43,6 +43,8 @@ public function withLabels(array $labels): static;
 
     public function withMount(string $localPath, string $containerPath): static;
 
+    public function withTmpfs(string $containerPath, string $options = 'rw,noexec'): static;
+
     public function withName(string $name): static;
 
     public function withNetwork(string $networkName): static;
diff --git a/tests/Integration/GenericContainerTest.php b/tests/Integration/GenericContainerTest.php
index 0b4188f..0f7eea5 100644
--- a/tests/Integration/GenericContainerTest.php
+++ b/tests/Integration/GenericContainerTest.php
@@ -291,6 +291,19 @@ public function testShouldSetMount(): void
         $container->stop();
     }
 
+    public function testShouldSetTmpfs(): void
+    {
+        $container = (new GenericContainer('alpine'))
+            ->withTmpfs('/mnt/tmpfs')
+            ->withCommand(['tail', '-f', '/dev/null'])
+            ->start();
+
+        $result = $container->exec(['cat', '/proc/mounts']);
+        self::assertStringContainsString('tmpfs /mnt/tmpfs', $result);
+
+        $container->stop();
+    }
+
     public function testShouldSetPrivilegedMode(): void
     {
         $container = (new GenericContainer('alpine'))

From 8e485c252b7e413236f125cf960183254423d115 Mon Sep 17 00:00:00 2001
From: Andreas Wunderwald <wundii@gmail.com>
Date: Thu, 21 May 2026 10:08:42 +0200
Subject: [PATCH 2/2] fix: use stat to verify tmpfs mount type in test

Replaces `cat /proc/mounts` with `stat -f -c %T` to reliably check the
filesystem type, avoiding issues with large stream output in CI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 tests/Integration/GenericContainerTest.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/Integration/GenericContainerTest.php b/tests/Integration/GenericContainerTest.php
index 0f7eea5..78afe6e 100644
--- a/tests/Integration/GenericContainerTest.php
+++ b/tests/Integration/GenericContainerTest.php
@@ -298,8 +298,8 @@ public function testShouldSetTmpfs(): void
             ->withCommand(['tail', '-f', '/dev/null'])
             ->start();
 
-        $result = $container->exec(['cat', '/proc/mounts']);
-        self::assertStringContainsString('tmpfs /mnt/tmpfs', $result);
+        $result = $container->exec(['stat', '-f', '-c', '%T', '/mnt/tmpfs']);
+        self::assertSame('tmpfs', $result);
 
         $container->stop();
     }