From 9d9ecca96338018852263d5eaf145d3f896720fa Mon Sep 17 00:00:00 2001
From: Carl Johnsen <carl-johannes@di.ku.dk>
Date: Thu, 12 Mar 2026 08:45:47 +0000
Subject: [PATCH] Made Linux native library calls compile like the Mac one for
 multiple architectures.

---
 proprietary/DiskImage/Disk/Linux.cs           |  12 ++++--
 .../Duplicati.Proprietary.DiskImage.csproj    |  33 ++++++++++------
 .../NativeLibraryWrappers/compile_linux.sh    |  36 ++++++++++++++++++
 .../libc_wrapper_arm32.so                     | Bin 0 -> 8324 bytes
 .../libc_wrapper_arm64.so                     | Bin 0 -> 9632 bytes
 .../NativeLibraryWrappers/libc_wrapper_x86.so | Bin 0 -> 14632 bytes
 .../libc_wrapper_x86_64.so                    | Bin 0 -> 15408 bytes
 .../linux_libc_wrapper.c                      |   0
 8 files changed, 65 insertions(+), 16 deletions(-)
 create mode 100755 proprietary/DiskImage/NativeLibraryWrappers/compile_linux.sh
 create mode 100755 proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_arm32.so
 create mode 100755 proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_arm64.so
 create mode 100755 proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_x86.so
 create mode 100755 proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_x86_64.so
 rename proprietary/DiskImage/{Disk => NativeLibraryWrappers}/linux_libc_wrapper.c (100%)

diff --git a/proprietary/DiskImage/Disk/Linux.cs b/proprietary/DiskImage/Disk/Linux.cs
index b7c0100e5..5f2fa8f0c 100644
--- a/proprietary/DiskImage/Disk/Linux.cs
+++ b/proprietary/DiskImage/Disk/Linux.cs
@@ -41,11 +41,13 @@ namespace Duplicati.Proprietary.DiskImage.Disk
         // File open flags from <fcntl.h>
         private const int O_RDONLY = 0x0000;
         private const int O_RDWR = 0x0002;
-        // TODO Should be processor architecture agnostic.
         // O_DIRECT: bypass kernel page cache for unbuffered I/O
-        // Value is architecture-dependent: 0x4000 on x86_64, 0x10000 on aarch64
-        // Using 0x4000 as the most common value (x86_64)
-        private const int O_DIRECT = 0x4000;
+        // Value is architecture-dependent: 0x4000 on x86/x86_64/arm32, 0x10000 on arm64
+        private static int O_DIRECT => RuntimeInformation.IsOSPlatform(OSPlatform.Linux) switch
+        {
+            true when RuntimeInformation.OSArchitecture == Architecture.Arm64 => 0x10000,
+            _ => 0x4000 // Default to x86/x86_64/arm32 value
+        };
 
         private readonly string m_devicePath;
         private int m_fileDescriptor = -1;
@@ -484,6 +486,8 @@ namespace Duplicati.Proprietary.DiskImage.Disk
         #region P/Invoke Declarations
 
         // P/Invoke to the native wrapper library for ioctls
+        // The .NET runtime will automatically load the correct architecture-specific version
+        // from runtimes/linux-{arch}/native/libc_wrapper.so based on the current RID
         [LibraryImport("libc_wrapper.so", SetLastError = true)]
         internal static partial int ioctl_uint32(int fd, uint request, ref uint value);
 
diff --git a/proprietary/DiskImage/Duplicati.Proprietary.DiskImage.csproj b/proprietary/DiskImage/Duplicati.Proprietary.DiskImage.csproj
index 470c66803..7b3bb2489 100644
--- a/proprietary/DiskImage/Duplicati.Proprietary.DiskImage.csproj
+++ b/proprietary/DiskImage/Duplicati.Proprietary.DiskImage.csproj
@@ -16,26 +16,35 @@
     <ProjectReference Include="..\..\Duplicati\Library\Logging\Duplicati.Library.Logging.csproj" />
   </ItemGroup>
 
+  <!-- Native libraries -->
   <ItemGroup>
+    <!-- Windows -->
     <PackageReference Include="Vanara.PInvoke.Kernel32" Version="5.0.0" />
     <PackageReference Include="Vanara.PInvoke.Shared" Version="5.0.0" />
+    <!-- Mac -->
     <ContentWithTargetPath Include="$(ProjectDir)NativeLibraryWrappers/libSystem_wrapper.dylib">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <TargetPath>runtimes/osx/native/libSystem_wrapper.dylib</TargetPath>
     </ContentWithTargetPath>
-  </ItemGroup>
-
-  <Target Name="CompileNativeLibraryLinux" AfterTargets="Build" Condition="$([MSBuild]::IsOSPlatform('linux'))">
-    <!-- Compile the shared library directly to the project directory -->
-    <Exec Command="gcc -shared -fPIC -o $(OutputPath)libc_wrapper.so $(ProjectDir)Disk/linux_libc_wrapper.c" />
-    <!-- Change permissions to 777, so everybody can delete / overwrite the lib when building. -->
-    <Exec Command="chmod 777 $(OutputPath)libc_wrapper.so" />
-  </Target>
-
-  <ItemGroup Condition="$([MSBuild]::IsOSPlatform('linux'))">
-    <ContentWithTargetPath Include="$(OutputPath)libc_wrapper.so">
+    <!-- x86 Linux -->
+    <ContentWithTargetPath Include="$(ProjectDir)NativeLibraryWrappers/libc_wrapper_x86.so">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-      <TargetPath>libc_wrapper.so</TargetPath>
+      <TargetPath>runtimes/linux-x86/native/libc_wrapper.so</TargetPath>
+    </ContentWithTargetPath>
+    <!-- x64 Linux -->
+    <ContentWithTargetPath Include="$(ProjectDir)NativeLibraryWrappers/libc_wrapper_x86_64.so">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <TargetPath>runtimes/linux-x64/native/libc_wrapper.so</TargetPath>
+    </ContentWithTargetPath>
+    <!-- ARM32 Linux -->
+    <ContentWithTargetPath Include="$(ProjectDir)NativeLibraryWrappers/libc_wrapper_arm32.so">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <TargetPath>runtimes/linux-arm/native/libc_wrapper.so</TargetPath>
+    </ContentWithTargetPath>
+    <!-- ARM64 Linux -->
+    <ContentWithTargetPath Include="$(ProjectDir)NativeLibraryWrappers/libc_wrapper_arm64.so">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <TargetPath>runtimes/linux-arm64/native/libc_wrapper.so</TargetPath>
     </ContentWithTargetPath>
   </ItemGroup>
 
diff --git a/proprietary/DiskImage/NativeLibraryWrappers/compile_linux.sh b/proprietary/DiskImage/NativeLibraryWrappers/compile_linux.sh
new file mode 100755
index 000000000..4f60a051d
--- /dev/null
+++ b/proprietary/DiskImage/NativeLibraryWrappers/compile_linux.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+set -e
+
+# Compile Linux libc wrapper for multiple architectures
+# Note: Unlike macOS, Linux does not support creating a single multi-arch .so file via standard tools.
+# This script creates separate .so files for each architecture.
+
+# First, check if docker is available on PATH
+if ! command -v docker &> /dev/null
+then
+    echo "Docker is not installed. Please install Docker to continue."
+    exit 1
+fi
+
+echo "Compiling x86..."
+docker run --rm dockcross/linux-x86 > dockcross && chmod +x dockcross
+./dockcross /bin/bash -c '$CC -shared -fPIC -m32 -o libc_wrapper_x86.so linux_libc_wrapper.c'
+
+echo "Compiling x64..."
+docker run --rm dockcross/linux-x64 > dockcross && chmod +x dockcross
+./dockcross /bin/bash -c '$CC -shared -fPIC -m64 -o libc_wrapper_x86_64.so linux_libc_wrapper.c'
+
+echo "Compiling ARM32..."
+docker run --rm dockcross/linux-armv7 > dockcross && chmod +x dockcross
+./dockcross /bin/bash -c '$CC -shared -fPIC -march=armv7-a -o libc_wrapper_arm32.so linux_libc_wrapper.c'
+
+echo "Compiling ARM64..."
+docker run --rm dockcross/linux-arm64 > dockcross && chmod +x dockcross
+./dockcross /bin/bash -c '$CC -shared -fPIC -march=armv8-a -o libc_wrapper_arm64.so linux_libc_wrapper.c'
+
+chmod 777 libc_wrapper_x86.so
+chmod 777 libc_wrapper_x86_64.so
+chmod 777 libc_wrapper_arm32.so
+chmod 777 libc_wrapper_arm64.so
+rm dockcross
+echo "Compilation complete. Generated .so files for x86, x86_64, ARM32, and ARM64."
\ No newline at end of file
diff --git a/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_arm32.so b/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_arm32.so
new file mode 100755
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diff --git a/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_arm64.so b/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_arm64.so
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diff --git a/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_x86.so b/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_x86.so
new file mode 100755
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diff --git a/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_x86_64.so b/proprietary/DiskImage/NativeLibraryWrappers/libc_wrapper_x86_64.so
new file mode 100755
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diff --git a/proprietary/DiskImage/Disk/linux_libc_wrapper.c b/proprietary/DiskImage/NativeLibraryWrappers/linux_libc_wrapper.c
similarity index 100%
rename from proprietary/DiskImage/Disk/linux_libc_wrapper.c
rename to proprietary/DiskImage/NativeLibraryWrappers/linux_libc_wrapper.c