Repository: charmbracelet/crush

Issue:
The AWS Bedrock Provider Should Support AWS CLI Profiles
All modern CLI utilities that support connecting to AWS API's are typically configured to use an AWS CLI profile name instead of having to set an access key, secret key, and region separately.

Crush should support this as well via an AWS_PROFILE_NAME environment variable.

Discussion:
@AFRUITPIE: I've been using it with my default profile just fine!

[Crush uses the Anthropic Go SDK](https://github.com/charmbracelet/crush/blob/317c5dbfafc0ebda8b86f25e8e4c8cda281b8df2/internal/llm/provider/anthropic.go#L71) for Bedrock, which itself [uses the default AWS config](https://github.com/anthropics/anthropic-sdk-go?tab=readme-ov-file#amazon-bedrock). 

You can use the [`AWS_PROFILE` environment variable](https://docs.aws.amazon.com/cli/v1/userguide/cli-configure-files.html#cli-configure-files-using-profiles) to use whatever profile you want.@severity1: AWS_PROFILE="myprofile" AWS_REGION="us-east-1" crush@kovariance: This should be documented.@caarlos0: opened #1104

Solution patch:
diff --git a/.goreleaser.yml b/.goreleaser.yml
index 7c477b58..c0da1c50 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -67,8 +67,12 @@ builds:
         goarch: arm
       - goos: android
         goarch: "386"
+      - goos: windows
+        goarch: arm
     ldflags:
       - -s -w -X github.com/charmbracelet/crush/internal/version.Version={{.Version}}
+    flags:
+      - -trimpath
 
 archives:
   - name_template: >-
diff --git a/README.md b/README.md
index e89c651d..89b1386c 100644
--- a/README.md
+++ b/README.md
@@ -188,6 +188,8 @@ That said, you can also set environment variables for preferred providers.
 | `AWS_ACCESS_KEY_ID`         | AWS Bedrock (Claude)                               |
 | `AWS_SECRET_ACCESS_KEY`     | AWS Bedrock (Claude)                               |
 | `AWS_REGION`                | AWS Bedrock (Claude)                               |
+| `AWS_PROFILE`               | Custom AWS Profile                                 |
+| `AWS_REGION`                | AWS Region                                         |
 | `AZURE_OPENAI_API_ENDPOINT` | Azure OpenAI models                                |
 | `AZURE_OPENAI_API_KEY`      | Azure OpenAI models (optional when using Entra ID) |
 | `AZURE_OPENAI_API_VERSION`  | Azure OpenAI models                                |
diff --git a/internal/config/load.go b/internal/config/load.go
index 9ac5411f..500fc236 100644
--- a/internal/config/load.go
+++ b/internal/config/load.go
@@ -41,13 +41,8 @@ func LoadReader(fd io.Reader) (*Config, error) {
 
 // Load loads the configuration from the default paths.
 func Load(workingDir, dataDir string, debug bool) (*Config, error) {
-	// uses default config paths
-	configPaths := []string{
-		globalConfig(),
-		GlobalConfigData(),
-		filepath.Join(workingDir, fmt.Sprintf("%s.json", appName)),
-		filepath.Join(workingDir, fmt.Sprintf(".%s.json", appName)),
-	}
+	configPaths := lookupConfigs(workingDir)
+
 	cfg, err := loadFromConfigPaths(configPaths)
 	if err != nil {
 		return nil, fmt.Errorf("failed to load config from paths %v: %w", configPaths, err)
@@ -316,7 +311,7 @@ func (c *Config) setDefaults(workingDir, dataDir string) {
 	if dataDir != "" {
 		c.Options.DataDirectory = dataDir
 	} else if c.Options.DataDirectory == "" {
-		if path, ok := fsext.SearchParent(workingDir, defaultDataDirectory); ok {
+		if path, ok := fsext.LookupClosest(workingDir, defaultDataDirectory); ok {
 			c.Options.DataDirectory = path
 		} else {
 			c.Options.DataDirectory = filepath.Join(workingDir, defaultDataDirectory)
@@ -357,7 +352,7 @@ func (c *Config) applyLSPDefaults() {
 	// Apply defaults to each LSP configuration
 	for name, cfg := range c.LSP {
 		// Try to get defaults from powernap based on command name
-		base, ok := configManager.GetServer(cfg.Command)
+		base, ok := configManager.GetServer(name)
 		if !ok {
 			continue
 		}
@@ -514,6 +509,28 @@ func (c *Config) configureSelectedModels(knownProviders []catwalk.Provider) erro
 	return nil
 }
 
+// lookupConfigs searches config files recursively from CWD up to FS root
+func lookupConfigs(cwd string) []string {
+	// prepend default config paths
+	configPaths := []string{
+		globalConfig(),
+		GlobalConfigData(),
+	}
+
+	configNames := []string{appName + ".json", "." + appName + ".json"}
+
+	foundConfigs, err := fsext.Lookup(cwd, configNames...)
+	if err != nil {
+		// returns at least default configs
+		return configPaths
+	}
+
+	// reverse order so last config has more priority
+	slices.Reverse(foundConfigs)
+
+	return append(configPaths, foundConfigs...)
+}
+
 func loadFromConfigPaths(configPaths []string) (*Config, error) {
 	var configs []io.Reader
 
diff --git a/internal/fsext/lookup.go b/internal/fsext/lookup.go
new file mode 100644
index 00000000..09842657
--- /dev/null
+++ b/internal/fsext/lookup.go
@@ -0,0 +1,141 @@
+package fsext
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/charmbracelet/crush/internal/home"
+)
+
+// Lookup searches for a target files or directories starting from dir
+// and walking up the directory tree until filesystem root is reached.
+// It also checks the ownership of files to ensure that the search does
+// not cross ownership boundaries. It skips ownership mismatches without
+// errors.
+// Returns full paths to fount targets.
+// The search includes the starting directory itself.
+func Lookup(dir string, targets ...string) ([]string, error) {
+	if len(targets) == 0 {
+		return nil, nil
+	}
+
+	var found []string
+
+	err := traverseUp(dir, func(cwd string, owner int) error {
+		for _, target := range targets {
+			fpath := filepath.Join(cwd, target)
+			err := probeEnt(fpath, owner)
+
+			// skip to the next file on permission denied
+			if errors.Is(err, os.ErrNotExist) ||
+				errors.Is(err, os.ErrPermission) {
+				continue
+			}
+
+			if err != nil {
+				return fmt.Errorf("error probing file %s: %w", fpath, err)
+			}
+
+			found = append(found, fpath)
+		}
+
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return found, nil
+}
+
+// LookupClosest searches for a target file or directory starting from dir
+// and walking up the directory tree until found or root or home is reached.
+// It also checks the ownership of files to ensure that the search does
+// not cross ownership boundaries.
+// Returns the full path to the target if found, empty string and false otherwise.
+// The search includes the starting directory itself.
+func LookupClosest(dir, target string) (string, bool) {
+	var found string
+
+	err := traverseUp(dir, func(cwd string, owner int) error {
+		fpath := filepath.Join(cwd, target)
+
+		err := probeEnt(fpath, owner)
+		if errors.Is(err, os.ErrNotExist) {
+			return nil
+		}
+
+		if err != nil {
+			return fmt.Errorf("error probing file %s: %w", fpath, err)
+		}
+
+		if cwd == home.Dir() {
+			return filepath.SkipAll
+		}
+
+		found = fpath
+		return filepath.SkipAll
+	})
+
+	return found, err == nil && found != ""
+}
+
+// traverseUp walks up from given directory up until filesystem root reached.
+// It passes absolute path of current directory and staring directory owner ID
+// to callback function. It is up to user to check ownership.
+func traverseUp(dir string, walkFn func(dir string, owner int) error) error {
+	cwd, err := filepath.Abs(dir)
+	if err != nil {
+		return fmt.Errorf("cannot convert CWD to absolute path: %w", err)
+	}
+
+	owner, err := Owner(dir)
+	if err != nil {
+		return fmt.Errorf("cannot get ownership: %w", err)
+	}
+
+	for {
+		err := walkFn(cwd, owner)
+		if err == nil || errors.Is(err, filepath.SkipDir) {
+			parent := filepath.Dir(cwd)
+			if parent == cwd {
+				return nil
+			}
+
+			cwd = parent
+			continue
+		}
+
+		if errors.Is(err, filepath.SkipAll) {
+			return nil
+		}
+
+		return err
+	}
+}
+
+// probeEnt checks if entity at given path exists and belongs to given owner
+func probeEnt(fspath string, owner int) error {
+	_, err := os.Stat(fspath)
+	if err != nil {
+		return fmt.Errorf("cannot stat %s: %w", fspath, err)
+	}
+
+	// special case for ownership check bypass
+	if owner == -1 {
+		return nil
+	}
+
+	fowner, err := Owner(fspath)
+	if err != nil {
+		return fmt.Errorf("cannot get ownership for %s: %w", fspath, err)
+	}
+
+	if fowner != owner {
+		return os.ErrPermission
+	}
+
+	return nil
+}
diff --git a/internal/fsext/owner_windows.go b/internal/fsext/owner_windows.go
index 107cda00..41f9091c 100644
--- a/internal/fsext/owner_windows.go
+++ b/internal/fsext/owner_windows.go
@@ -2,8 +2,14 @@
 
 package fsext
 
+import "os"
+
 // Owner retrieves the user ID of the owner of the file or directory at the
 // specified path.
 func Owner(path string) (int, error) {
+	_, err := os.Stat(path)
+	if err != nil {
+		return 0, err
+	}
 	return -1, nil
 }
diff --git a/internal/fsext/parent.go b/internal/fsext/parent.go
deleted file mode 100644
index bd319361..00000000
--- a/internal/fsext/parent.go
+++ /dev/null
@@ -1,60 +0,0 @@
-package fsext
-
-import (
-	"errors"
-	"os"
-	"path/filepath"
-
-	"github.com/charmbracelet/crush/internal/home"
-)
-
-// SearchParent searches for a target file or directory starting from dir
-// and walking up the directory tree until found or root or home is reached.
-// It also checks the ownership of directories to ensure that the search does
-// not cross ownership boundaries.
-// Returns the full path to the target if found, empty string and false otherwise.
-// The search includes the starting directory itself.
-func SearchParent(dir, target string) (string, bool) {
-	absDir, err := filepath.Abs(dir)
-	if err != nil {
-		return "", false
-	}
-
-	path := filepath.Join(absDir, target)
-	if _, err := os.Stat(path); err == nil {
-		return path, true
-	} else if !errors.Is(err, os.ErrNotExist) {
-		return "", false
-	}
-
-	previousParent := absDir
-	previousOwner, err := Owner(previousParent)
-	if err != nil {
-		return "", false
-	}
-
-	for {
-		parent := filepath.Dir(previousParent)
-		if parent == previousParent || parent == home.Dir() {
-			return "", false
-		}
-
-		parentOwner, err := Owner(parent)
-		if err != nil {
-			return "", false
-		}
-		if parentOwner != previousOwner {
-			return "", false
-		}
-
-		path := filepath.Join(parent, target)
-		if _, err := os.Stat(path); err == nil {
-			return path, true
-		} else if !errors.Is(err, os.ErrNotExist) {
-			return "", false
-		}
-
-		previousParent = parent
-		previousOwner = parentOwner
-	}
-}
diff --git a/internal/llm/agent/mcp-tools.go b/internal/llm/agent/mcp-tools.go
index 90011c43..67d46b54 100644
--- a/internal/llm/agent/mcp-tools.go
+++ b/internal/llm/agent/mcp-tools.go
@@ -15,6 +15,7 @@ import (
 
 	"github.com/charmbracelet/crush/internal/config"
 	"github.com/charmbracelet/crush/internal/csync"
+	"github.com/charmbracelet/crush/internal/home"
 	"github.com/charmbracelet/crush/internal/llm/tools"
 	"github.com/charmbracelet/crush/internal/permission"
 	"github.com/charmbracelet/crush/internal/pubsub"
@@ -360,7 +361,7 @@ func createMcpClient(name string, m config.MCPConfig) (*client.Client, error) {
 			return nil, fmt.Errorf("mcp stdio config requires a non-empty 'command' field")
 		}
 		return client.NewStdioMCPClientWithOptions(
-			m.Command,
+			home.Long(m.Command),
 			m.ResolvedEnv(),
 			m.Args,
 			transport.WithCommandLogger(mcpLogger{name: name}),
diff --git a/internal/lsp/client.go b/internal/lsp/client.go
index 70146d3a..aedf2476 100644
--- a/internal/lsp/client.go
+++ b/internal/lsp/client.go
@@ -15,6 +15,7 @@ import (
 	"github.com/charmbracelet/crush/internal/config"
 	"github.com/charmbracelet/crush/internal/csync"
 	"github.com/charmbracelet/crush/internal/fsext"
+	"github.com/charmbracelet/crush/internal/home"
 	powernap "github.com/charmbracelet/x/powernap/pkg/lsp"
 	"github.com/charmbracelet/x/powernap/pkg/lsp/protocol"
 	"github.com/charmbracelet/x/powernap/pkg/transport"
@@ -55,7 +56,7 @@ func New(ctx context.Context, name string, config config.LSPConfig) (*Client, er
 
 	// Create powernap client config
 	clientConfig := powernap.ClientConfig{
-		Command: config.Command,
+		Command: home.Long(config.Command),
 		Args:    config.Args,
 		RootURI: rootURI,
 		Environment: func() map[string]string {



Test patch:
diff --git a/internal/fsext/lookup_test.go b/internal/fsext/lookup_test.go
new file mode 100644
index 00000000..b7604331
--- /dev/null
+++ b/internal/fsext/lookup_test.go
@@ -0,0 +1,483 @@
+package fsext
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/charmbracelet/crush/internal/home"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLookupClosest(t *testing.T) {
+	tempDir := t.TempDir()
+
+	// Change to temp directory
+	oldWd, _ := os.Getwd()
+	err := os.Chdir(tempDir)
+	require.NoError(t, err)
+
+	t.Cleanup(func() {
+		os.Chdir(oldWd)
+	})
+
+	t.Run("target found in starting directory", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create target file in current directory
+		targetFile := filepath.Join(testDir, "target.txt")
+		err := os.WriteFile(targetFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		foundPath, found := LookupClosest(testDir, "target.txt")
+		require.True(t, found)
+		require.Equal(t, targetFile, foundPath)
+	})
+
+	t.Run("target found in parent directory", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create subdirectory
+		subDir := filepath.Join(testDir, "subdir")
+		err := os.Mkdir(subDir, 0o755)
+		require.NoError(t, err)
+
+		// Create target file in parent directory
+		targetFile := filepath.Join(testDir, "target.txt")
+		err = os.WriteFile(targetFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		foundPath, found := LookupClosest(subDir, "target.txt")
+		require.True(t, found)
+		require.Equal(t, targetFile, foundPath)
+	})
+
+	t.Run("target found in grandparent directory", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create nested subdirectories
+		subDir := filepath.Join(testDir, "subdir")
+		err := os.Mkdir(subDir, 0o755)
+		require.NoError(t, err)
+
+		subSubDir := filepath.Join(subDir, "subsubdir")
+		err = os.Mkdir(subSubDir, 0o755)
+		require.NoError(t, err)
+
+		// Create target file in grandparent directory
+		targetFile := filepath.Join(testDir, "target.txt")
+		err = os.WriteFile(targetFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		foundPath, found := LookupClosest(subSubDir, "target.txt")
+		require.True(t, found)
+		require.Equal(t, targetFile, foundPath)
+	})
+
+	t.Run("target not found", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		foundPath, found := LookupClosest(testDir, "nonexistent.txt")
+		require.False(t, found)
+		require.Empty(t, foundPath)
+	})
+
+	t.Run("target directory found", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create target directory in current directory
+		targetDir := filepath.Join(testDir, "targetdir")
+		err := os.Mkdir(targetDir, 0o755)
+		require.NoError(t, err)
+
+		foundPath, found := LookupClosest(testDir, "targetdir")
+		require.True(t, found)
+		require.Equal(t, targetDir, foundPath)
+	})
+
+	t.Run("stops at home directory", func(t *testing.T) {
+		// This test is limited as we can't easily create files above home directory
+		// but we can test the behavior by searching from home directory itself
+		homeDir := home.Dir()
+
+		// Search for a file that doesn't exist from home directory
+		foundPath, found := LookupClosest(homeDir, "nonexistent_file_12345.txt")
+		require.False(t, found)
+		require.Empty(t, foundPath)
+	})
+
+	t.Run("invalid starting directory", func(t *testing.T) {
+		foundPath, found := LookupClosest("/invalid/path/that/does/not/exist", "target.txt")
+		require.False(t, found)
+		require.Empty(t, foundPath)
+	})
+
+	t.Run("relative path handling", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Change to test directory
+		oldWd, _ := os.Getwd()
+		err := os.Chdir(testDir)
+		require.NoError(t, err)
+		defer os.Chdir(oldWd)
+
+		// Create target file in current directory
+		err = os.WriteFile("target.txt", []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		// Search using relative path
+		foundPath, found := LookupClosest(".", "target.txt")
+		require.True(t, found)
+
+		// Resolve symlinks to handle macOS /private/var vs /var discrepancy
+		expectedPath, err := filepath.EvalSymlinks(filepath.Join(testDir, "target.txt"))
+		require.NoError(t, err)
+		actualPath, err := filepath.EvalSymlinks(foundPath)
+		require.NoError(t, err)
+		require.Equal(t, expectedPath, actualPath)
+	})
+}
+
+func TestLookupClosestWithOwnership(t *testing.T) {
+	// Note: Testing ownership boundaries is difficult in a cross-platform way
+	// without creating complex directory structures with different owners.
+	// This test focuses on the basic functionality when ownership checks pass.
+
+	tempDir := t.TempDir()
+
+	// Change to temp directory
+	oldWd, _ := os.Getwd()
+	err := os.Chdir(tempDir)
+	require.NoError(t, err)
+
+	t.Cleanup(func() {
+		os.Chdir(oldWd)
+	})
+
+	t.Run("search respects same ownership", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create subdirectory structure
+		subDir := filepath.Join(testDir, "subdir")
+		err := os.Mkdir(subDir, 0o755)
+		require.NoError(t, err)
+
+		// Create target file in parent directory
+		targetFile := filepath.Join(testDir, "target.txt")
+		err = os.WriteFile(targetFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		// Search should find the target assuming same ownership
+		foundPath, found := LookupClosest(subDir, "target.txt")
+		require.True(t, found)
+		require.Equal(t, targetFile, foundPath)
+	})
+}
+
+func TestLookup(t *testing.T) {
+	tempDir := t.TempDir()
+
+	// Change to temp directory
+	oldWd, _ := os.Getwd()
+	err := os.Chdir(tempDir)
+	require.NoError(t, err)
+
+	t.Cleanup(func() {
+		os.Chdir(oldWd)
+	})
+
+	t.Run("no targets returns empty slice", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		found, err := Lookup(testDir)
+		require.NoError(t, err)
+		require.Empty(t, found)
+	})
+
+	t.Run("single target found in starting directory", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create target file in current directory
+		targetFile := filepath.Join(testDir, "target.txt")
+		err := os.WriteFile(targetFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		found, err := Lookup(testDir, "target.txt")
+		require.NoError(t, err)
+		require.Len(t, found, 1)
+		require.Equal(t, targetFile, found[0])
+	})
+
+	t.Run("multiple targets found in starting directory", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create multiple target files in current directory
+		targetFile1 := filepath.Join(testDir, "target1.txt")
+		targetFile2 := filepath.Join(testDir, "target2.txt")
+		targetFile3 := filepath.Join(testDir, "target3.txt")
+
+		err := os.WriteFile(targetFile1, []byte("test1"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile(targetFile2, []byte("test2"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile(targetFile3, []byte("test3"), 0o644)
+		require.NoError(t, err)
+
+		found, err := Lookup(testDir, "target1.txt", "target2.txt", "target3.txt")
+		require.NoError(t, err)
+		require.Len(t, found, 3)
+		require.Contains(t, found, targetFile1)
+		require.Contains(t, found, targetFile2)
+		require.Contains(t, found, targetFile3)
+	})
+
+	t.Run("targets found in parent directories", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create subdirectory
+		subDir := filepath.Join(testDir, "subdir")
+		err := os.Mkdir(subDir, 0o755)
+		require.NoError(t, err)
+
+		// Create target files in parent directory
+		targetFile1 := filepath.Join(testDir, "target1.txt")
+		targetFile2 := filepath.Join(testDir, "target2.txt")
+		err = os.WriteFile(targetFile1, []byte("test1"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile(targetFile2, []byte("test2"), 0o644)
+		require.NoError(t, err)
+
+		found, err := Lookup(subDir, "target1.txt", "target2.txt")
+		require.NoError(t, err)
+		require.Len(t, found, 2)
+		require.Contains(t, found, targetFile1)
+		require.Contains(t, found, targetFile2)
+	})
+
+	t.Run("targets found across multiple directory levels", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create nested subdirectories
+		subDir := filepath.Join(testDir, "subdir")
+		err := os.Mkdir(subDir, 0o755)
+		require.NoError(t, err)
+
+		subSubDir := filepath.Join(subDir, "subsubdir")
+		err = os.Mkdir(subSubDir, 0o755)
+		require.NoError(t, err)
+
+		// Create target files at different levels
+		targetFile1 := filepath.Join(testDir, "target1.txt")
+		targetFile2 := filepath.Join(subDir, "target2.txt")
+		targetFile3 := filepath.Join(subSubDir, "target3.txt")
+
+		err = os.WriteFile(targetFile1, []byte("test1"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile(targetFile2, []byte("test2"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile(targetFile3, []byte("test3"), 0o644)
+		require.NoError(t, err)
+
+		found, err := Lookup(subSubDir, "target1.txt", "target2.txt", "target3.txt")
+		require.NoError(t, err)
+		require.Len(t, found, 3)
+		require.Contains(t, found, targetFile1)
+		require.Contains(t, found, targetFile2)
+		require.Contains(t, found, targetFile3)
+	})
+
+	t.Run("some targets not found", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create only some target files
+		targetFile1 := filepath.Join(testDir, "target1.txt")
+		targetFile2 := filepath.Join(testDir, "target2.txt")
+
+		err := os.WriteFile(targetFile1, []byte("test1"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile(targetFile2, []byte("test2"), 0o644)
+		require.NoError(t, err)
+
+		// Search for existing and non-existing targets
+		found, err := Lookup(testDir, "target1.txt", "nonexistent.txt", "target2.txt", "another_nonexistent.txt")
+		require.NoError(t, err)
+		require.Len(t, found, 2)
+		require.Contains(t, found, targetFile1)
+		require.Contains(t, found, targetFile2)
+	})
+
+	t.Run("no targets found", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		found, err := Lookup(testDir, "nonexistent1.txt", "nonexistent2.txt", "nonexistent3.txt")
+		require.NoError(t, err)
+		require.Empty(t, found)
+	})
+
+	t.Run("target directories found", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create target directories
+		targetDir1 := filepath.Join(testDir, "targetdir1")
+		targetDir2 := filepath.Join(testDir, "targetdir2")
+		err := os.Mkdir(targetDir1, 0o755)
+		require.NoError(t, err)
+		err = os.Mkdir(targetDir2, 0o755)
+		require.NoError(t, err)
+
+		found, err := Lookup(testDir, "targetdir1", "targetdir2")
+		require.NoError(t, err)
+		require.Len(t, found, 2)
+		require.Contains(t, found, targetDir1)
+		require.Contains(t, found, targetDir2)
+	})
+
+	t.Run("mixed files and directories", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Create target files and directories
+		targetFile := filepath.Join(testDir, "target.txt")
+		targetDir := filepath.Join(testDir, "targetdir")
+		err := os.WriteFile(targetFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+		err = os.Mkdir(targetDir, 0o755)
+		require.NoError(t, err)
+
+		found, err := Lookup(testDir, "target.txt", "targetdir")
+		require.NoError(t, err)
+		require.Len(t, found, 2)
+		require.Contains(t, found, targetFile)
+		require.Contains(t, found, targetDir)
+	})
+
+	t.Run("invalid starting directory", func(t *testing.T) {
+		found, err := Lookup("/invalid/path/that/does/not/exist", "target.txt")
+		require.Error(t, err)
+		require.Empty(t, found)
+	})
+
+	t.Run("relative path handling", func(t *testing.T) {
+		testDir := t.TempDir()
+
+		// Change to test directory
+		oldWd, _ := os.Getwd()
+		err := os.Chdir(testDir)
+		require.NoError(t, err)
+
+		t.Cleanup(func() {
+			os.Chdir(oldWd)
+		})
+
+		// Create target files in current directory
+		err = os.WriteFile("target1.txt", []byte("test1"), 0o644)
+		require.NoError(t, err)
+		err = os.WriteFile("target2.txt", []byte("test2"), 0o644)
+		require.NoError(t, err)
+
+		// Search using relative path
+		found, err := Lookup(".", "target1.txt", "target2.txt")
+		require.NoError(t, err)
+		require.Len(t, found, 2)
+
+		// Resolve symlinks to handle macOS /private/var vs /var discrepancy
+		expectedPath1, err := filepath.EvalSymlinks(filepath.Join(testDir, "target1.txt"))
+		require.NoError(t, err)
+		expectedPath2, err := filepath.EvalSymlinks(filepath.Join(testDir, "target2.txt"))
+		require.NoError(t, err)
+
+		// Check that found paths match expected paths (order may vary)
+		foundEvalSymlinks := make([]string, len(found))
+		for i, path := range found {
+			evalPath, err := filepath.EvalSymlinks(path)
+			require.NoError(t, err)
+			foundEvalSymlinks[i] = evalPath
+		}
+
+		require.Contains(t, foundEvalSymlinks, expectedPath1)
+		require.Contains(t, foundEvalSymlinks, expectedPath2)
+	})
+}
+
+func TestProbeEnt(t *testing.T) {
+	t.Run("existing file with correct owner", func(t *testing.T) {
+		tempDir := t.TempDir()
+
+		// Create test file
+		testFile := filepath.Join(tempDir, "test.txt")
+		err := os.WriteFile(testFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		// Get owner of temp directory
+		owner, err := Owner(tempDir)
+		require.NoError(t, err)
+
+		// Test probeEnt with correct owner
+		err = probeEnt(testFile, owner)
+		require.NoError(t, err)
+	})
+
+	t.Run("existing directory with correct owner", func(t *testing.T) {
+		tempDir := t.TempDir()
+
+		// Create test directory
+		testDir := filepath.Join(tempDir, "testdir")
+		err := os.Mkdir(testDir, 0o755)
+		require.NoError(t, err)
+
+		// Get owner of temp directory
+		owner, err := Owner(tempDir)
+		require.NoError(t, err)
+
+		// Test probeEnt with correct owner
+		err = probeEnt(testDir, owner)
+		require.NoError(t, err)
+	})
+
+	t.Run("nonexistent file", func(t *testing.T) {
+		tempDir := t.TempDir()
+
+		nonexistentFile := filepath.Join(tempDir, "nonexistent.txt")
+		owner, err := Owner(tempDir)
+		require.NoError(t, err)
+
+		err = probeEnt(nonexistentFile, owner)
+		require.Error(t, err)
+		require.True(t, errors.Is(err, os.ErrNotExist))
+	})
+
+	t.Run("nonexistent file in nonexistent directory", func(t *testing.T) {
+		nonexistentFile := "/this/directory/does/not/exists/nonexistent.txt"
+
+		err := probeEnt(nonexistentFile, -1)
+		require.Error(t, err)
+		require.True(t, errors.Is(err, os.ErrNotExist))
+	})
+
+	t.Run("ownership bypass with -1", func(t *testing.T) {
+		tempDir := t.TempDir()
+
+		// Create test file
+		testFile := filepath.Join(tempDir, "test.txt")
+		err := os.WriteFile(testFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		// Test probeEnt with -1 (bypass ownership check)
+		err = probeEnt(testFile, -1)
+		require.NoError(t, err)
+	})
+
+	t.Run("ownership mismatch returns permission error", func(t *testing.T) {
+		tempDir := t.TempDir()
+
+		// Create test file
+		testFile := filepath.Join(tempDir, "test.txt")
+		err := os.WriteFile(testFile, []byte("test"), 0o644)
+		require.NoError(t, err)
+
+		// Test probeEnt with different owner (use 9999 which is unlikely to be the actual owner)
+		err = probeEnt(testFile, 9999)
+		require.Error(t, err)
+		require.True(t, errors.Is(err, os.ErrPermission))
+	})
+}