Add DSC home directory to PATH to find included resources

dsc/tests/dsc_osinfo.tests.ps1

@@ -18,4 +18,23 @@ Describe 'Tests for osinfo examples' {
         $LASTEXITCODE | Should -Be 0
         $out.results[0].result.inDesiredState | Should -Be $IsMacOS
     }
+
+    It 'Verify dsc home directory is added to PATH to find included resources' -Tag z1{
+        $oldPath = $env:PATH
+        $oldLocation = Get-Location
+        try {
+            $exe_path = (Get-Command dsc).Path | Split-Path
+            $exe_path | Split-Path | Set-Location
+            # Remove exe_path from PATH if it is there
+            $new_path = ($oldPath.Split([System.IO.Path]::PathSeparator) | Where-Object { $_ -ne $exe_path }) -join [System.IO.Path]::PathSeparator
+            $env:PATH = $new_path
+
+            $null = & "$exe_path/dsc" config test -p "$PSScriptRoot/../examples/osinfo_parameters.dsc.yaml"
+            $LASTEXITCODE | Should -Be 0
+        }
+        finally {
+            $env:PATH = $oldPath
+            $oldLocation | Set-Location
+        }
+    }
 }

dsc_lib/src/discovery/command_discovery.rs

@@ -48,7 +48,7 @@ impl CommandDiscovery {
             trace!("DSC_RESOURCE_PATH not set, trying PATH");
             match env::var_os("PATH") {
                 Some(value) => {
-                    trace!("Using PATH: {:?}", value.to_string_lossy());
+                    trace!("Original PATH: {:?}", value.to_string_lossy());
                     value
                 },
                 None => {
@@ -58,18 +58,27 @@ impl CommandDiscovery {
         };
 
         let mut paths = env::split_paths(&path_env).collect::<Vec<_>>();
+        // remove duplicate entries
+        let mut uniques = HashSet::new();
+        paths.retain(|e|uniques.insert((*e).clone()));
 
-        // add exe home to start of path
+        // if exe home is not already in PATH env var then add it to env var and list of searched paths
         if !using_custom_path {
             if let Some(exe_home) = env::current_exe()?.parent() {
-                debug!("Adding exe home to path: {}", exe_home.to_string_lossy());
-                paths.insert(0, exe_home.to_path_buf());
-            }
-        }
+                let exe_home_pb = exe_home.to_path_buf();
+                if paths.contains(&exe_home_pb) {
+                    trace!("Exe home is already in path: {}", exe_home.to_string_lossy());
+                } else {
+                    trace!("Adding exe home to path: {}", exe_home.to_string_lossy());
+                    paths.push(exe_home_pb);
 
-        // remove duplicate entries to improve perf of resource search
-        let mut uniques = HashSet::new();
-        paths.retain(|e|uniques.insert((*e).clone()));
+                    if let Ok(new_path) = env::join_paths(paths.clone()) {
+                        debug!("Using PATH: {:?}", new_path.to_string_lossy());
+                        env::set_var("PATH", &new_path);
+                    }
+                }
+            }
+        };
 
         Ok(paths)
     }