Use $ORIGIN in rpath when linking

build.sh

@@ -1,23 +1,23 @@
 #!/bin/sh
 
 ARCHITECTURE=x64
-if [ "$(uname -m)" == "arm64" ]; then
+if [ "$(uname -m)" = "arm64" ]; then
     ARCHITECTURE=arm64
-elif [ -z "$1" ]; then
+elif [ -n "$1" ]; then
     ARCHITECTURE=$1
 fi
 
 TARGET=linux-$ARCHITECTURE
-if [ "$(uname)" == "Darwin" ]; then
+if [ "$(uname)" = "Darwin" ]; then
     TARGET=osx-$ARCHITECTURE
-else
+elif [ -n "$1" ]; then
     TARGET=$2-$ARCHITECTURE
 fi
 
 dotnet publish cli/Elk.Cli.csproj -r $TARGET -c Release
 rm -rf build
 
-if [ "$(uname)" == "Darwin" ]; then
+if [ "$(uname)" = "Darwin" ]; then
     mkdir -p build/$TARGET
     cp cli/bin/Release/*/$TARGET/publish/Elk.Cli build/$TARGET/elk
     cp -r cli/bin/Release/*/$TARGET/publish/Resources/* build/$TARGET

cli/Elk.Cli.csproj

@@ -19,7 +19,7 @@
     It's set to ../lib/elk, since this would mean ./usr/lib/elk if the executable is
     in ./usr/bin. This makes it work in local folder structures.
     -->
-    <LinkerArg Include="-Wl,-rpath,'../lib/elk'" Condition="$([MSBuild]::IsOSPlatform('macOS')) == 'false'" />
+    <LinkerArg Include="-Wl,-rpath,'$ORIGIN/../lib/elk'" Condition="$([MSBuild]::IsOSPlatform('macOS')) == 'false'" />
   </ItemGroup>
 
   <ItemGroup>

src/FileUtils.cs

@@ -18,16 +18,19 @@ public static class FileUtils
 {
     public static bool FileIsExecutable(string filePath)
     {
-        if (!File.Exists(filePath))
-            return false;
-
         if (OperatingSystem.IsWindows())
             return false;
 
-        var fileMode = File.GetUnixFileMode(filePath);
+        var fileInfo = new FileInfo(filePath);
+        if (!fileInfo.Exists)
+            return false;
 
         return (
-            fileMode & (UnixFileMode.OtherExecute | UnixFileMode.GroupExecute | UnixFileMode.UserExecute)
+            fileInfo.UnixFileMode & (
+                UnixFileMode.OtherExecute |
+                UnixFileMode.GroupExecute |
+                UnixFileMode.UserExecute
+            )
         ) != 0;
     }