Revert "MM-6839: search relative to executable (#8853)" (#8876)

This reverts commit d3cf110620033f8831a55a3fd911d7864b6aab4a.

3 files changed, 44 insertions, 252 deletions

diff --git a/cmd/platform/main.go b/cmd/platform/main.go
index 6d9952c70..b5ea51920 100644
--- a/cmd/platform/main.go
+++ b/cmd/platform/main.go
@@ -6,11 +6,20 @@ package main
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 	"syscall"
-
-	"github.com/mattermost/mattermost-server/utils"
 )
 
+func findMattermostBinary() string {
+	for _, file := range []string{"./mattermost", "../mattermost", "./bin/mattermost"} {
+		path, _ := filepath.Abs(file)
+		if stat, err := os.Stat(path); err == nil && !stat.IsDir() {
+			return path
+		}
+	}
+	return "./mattermost"
+}
+
 func main() {
 	// Print angry message to use mattermost command directly
 	fmt.Println(`
@@ -24,14 +33,7 @@ The platform binary will be removed in a future version.
 	args := os.Args
 	args[0] = "mattermost"
 	args = append(args, "--platform")
-
-	realMattermost := utils.FindFile("mattermost")
-	if realMattermost == "" {
-		// This will still fail, of course.
-		realMattermost = "./mattermost"
-	}
-
-	if err := syscall.Exec(utils.FindFile("mattermost"), args, nil); err != nil {
+	if err := syscall.Exec(findMattermostBinary(), args, nil); err != nil {
 		fmt.Println("Could not start Mattermost, use the mattermost command directly.")
 	}
 }
diff --git a/utils/config.go b/utils/config.go
index da1918490..00fd2642a 100644
--- a/utils/config.go
+++ b/utils/config.go
@@ -32,94 +32,36 @@ const (
 	LOG_FILENAME    = "mattermost.log"
 )
 
-var (
-	commonBaseSearchPaths = []string{
-		".",
-		"..",
-		"../..",
-		"../../..",
-	}
-)
-
-func FindPath(path string, baseSearchPaths []string, filter func(os.FileInfo) bool) string {
-	if filepath.IsAbs(path) {
-		if _, err := os.Stat(path); err == nil {
-			return path
-		}
-
-		return ""
-	}
-
-	searchPaths := []string{}
-	for _, baseSearchPath := range baseSearchPaths {
-		searchPaths = append(searchPaths, baseSearchPath)
-	}
-
-	// Additionally attempt to search relative to the location of the running binary.
-	var binaryDir string
-	if exe, err := os.Executable(); err == nil {
-		if exe, err = filepath.EvalSymlinks(exe); err == nil {
-			if exe, err = filepath.Abs(exe); err == nil {
-				binaryDir = filepath.Dir(exe)
-			}
-		}
-	}
-	if binaryDir != "" {
-		for _, baseSearchPath := range baseSearchPaths {
-			searchPaths = append(
-				searchPaths,
-				filepath.Join(binaryDir, baseSearchPath),
-			)
-		}
-	}
-
-	for _, parent := range searchPaths {
-		found, err := filepath.Abs(filepath.Join(parent, path))
-		if err != nil {
-			continue
-		} else if fileInfo, err := os.Stat(found); err == nil {
-			if filter != nil && filter(fileInfo) {
-				return found
-			} else {
-				return found
-			}
-		}
-	}
-
-	return ""
-}
-
 // FindConfigFile attempts to find an existing configuration file. fileName can be an absolute or
 // relative path or name such as "/opt/mattermost/config.json" or simply "config.json". An empty
 // string is returned if no configuration is found.
 func FindConfigFile(fileName string) (path string) {
-	found := FindFile(filepath.Join("config", fileName))
-	if found == "" {
-		found = FindPath(fileName, []string{"."}, nil)
+	if filepath.IsAbs(fileName) {
+		if _, err := os.Stat(fileName); err == nil {
+			return fileName
+		}
+	} else {
+		for _, dir := range []string{"./config", "../config", "../../config", "../../../config", "."} {
+			path, _ := filepath.Abs(filepath.Join(dir, fileName))
+			if _, err := os.Stat(path); err == nil {
+				return path
+			}
+		}
 	}
-
-	return found
-}
-
-// FindFile looks for the given file in nearby ancestors relative to the current working
-// directory as well as the directory of the executable.
-func FindFile(path string) string {
-	return FindPath(path, commonBaseSearchPaths, func(fileInfo os.FileInfo) bool {
-		return !fileInfo.IsDir()
-	})
+	return ""
 }
 
-// FindDir looks for the given directory in nearby ancestors relative to the current working
-// directory as well as the directory of the executable, falling back to `./` if not found.
+// FindDir looks for the given directory in nearby ancestors, falling back to `./` if not found.
 func FindDir(dir string) (string, bool) {
-	found := FindPath(dir, commonBaseSearchPaths, func(fileInfo os.FileInfo) bool {
-		return fileInfo.IsDir()
-	})
-	if found == "" {
-		return "./", false
+	for _, parent := range []string{".", "..", "../..", "../../.."} {
+		foundDir, err := filepath.Abs(filepath.Join(parent, dir))
+		if err != nil {
+			continue
+		} else if _, err := os.Stat(foundDir); err == nil {
+			return foundDir, true
+		}
 	}
-
-	return found, true
+	return "./", false
 }
 
 func MloggerConfigFromLoggerConfig(s *model.LogSettings) *mlog.LoggerConfiguration {
diff --git a/utils/config_test.go b/utils/config_test.go
index f57add303..75bbc420f 100644
--- a/utils/config_test.go
+++ b/utils/config_test.go
@@ -46,172 +46,20 @@ func TestTimezoneConfig(t *testing.T) {
 }
 
 func TestFindConfigFile(t *testing.T) {
-	t.Run("config.json in current working directory, not inside config/", func(t *testing.T) {
-		// Force a unique working directory
-		cwd, err := ioutil.TempDir("", "")
-		require.NoError(t, err)
-		defer os.RemoveAll(cwd)
-
-		prevDir, err := os.Getwd()
-		require.NoError(t, err)
-		defer os.Chdir(prevDir)
-		os.Chdir(cwd)
-
-		configJson, err := filepath.Abs("config.json")
-		require.NoError(t, err)
-		require.NoError(t, ioutil.WriteFile(configJson, []byte("{}"), 0600))
-
-		// Relative paths end up getting symlinks fully resolved.
-		configJsonResolved, err := filepath.EvalSymlinks(configJson)
-		require.NoError(t, err)
-
-		assert.Equal(t, configJsonResolved, FindConfigFile("config.json"))
-	})
+	dir, err := ioutil.TempDir("", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
 
-	t.Run("config/config.json from various paths", func(t *testing.T) {
-		// Create the following directory structure:
-		// tmpDir1/
-		//   config/
-		//     config.json
-		//   tmpDir2/
-		//     tmpDir3/
-		//       tmpDir4/
-		//         tmpDir5/
-		tmpDir1, err := ioutil.TempDir("", "")
-		require.NoError(t, err)
-		defer os.RemoveAll(tmpDir1)
-
-		err = os.Mkdir(filepath.Join(tmpDir1, "config"), 0700)
-		require.NoError(t, err)
-
-		tmpDir2, err := ioutil.TempDir(tmpDir1, "")
-		require.NoError(t, err)
-
-		tmpDir3, err := ioutil.TempDir(tmpDir2, "")
-		require.NoError(t, err)
-
-		tmpDir4, err := ioutil.TempDir(tmpDir3, "")
-		require.NoError(t, err)
-
-		tmpDir5, err := ioutil.TempDir(tmpDir4, "")
-		require.NoError(t, err)
-
-		configJson := filepath.Join(tmpDir1, "config", "config.json")
-		require.NoError(t, ioutil.WriteFile(configJson, []byte("{}"), 0600))
-
-		// Relative paths end up getting symlinks fully resolved, so use this below as necessary.
-		configJsonResolved, err := filepath.EvalSymlinks(configJson)
-		require.NoError(t, err)
-
-		testCases := []struct {
-			Description string
-			Cwd         *string
-			FileName    string
-			Expected    string
-		}{
-			{
-				"absolute path to config.json",
-				nil,
-				configJson,
-				configJson,
-			},
-			{
-				"absolute path to config.json from directory containing config.json",
-				&tmpDir1,
-				configJson,
-				configJson,
-			},
-			{
-				"relative path to config.json from directory containing config.json",
-				&tmpDir1,
-				"config.json",
-				configJsonResolved,
-			},
-			{
-				"subdirectory of directory containing config.json",
-				&tmpDir2,
-				"config.json",
-				configJsonResolved,
-			},
-			{
-				"twice-nested subdirectory of directory containing config.json",
-				&tmpDir3,
-				"config.json",
-				configJsonResolved,
-			},
-			{
-				"thrice-nested subdirectory of directory containing config.json",
-				&tmpDir4,
-				"config.json",
-				configJsonResolved,
-			},
-			{
-				"can't find from four nesting levels deep",
-				&tmpDir5,
-				"config.json",
-				"",
-			},
-		}
+	path := filepath.Join(dir, "config.json")
+	require.NoError(t, ioutil.WriteFile(path, []byte("{}"), 0600))
 
-		for _, testCase := range testCases {
-			t.Run(testCase.Description, func(t *testing.T) {
-				if testCase.Cwd != nil {
-					prevDir, err := os.Getwd()
-					require.NoError(t, err)
-					defer os.Chdir(prevDir)
-					os.Chdir(*testCase.Cwd)
-				}
-
-				assert.Equal(t, testCase.Expected, FindConfigFile(testCase.FileName))
-			})
-		}
-	})
-
-	t.Run("config/config.json relative to executable", func(t *testing.T) {
-		osExecutable, err := os.Executable()
-		require.NoError(t, err)
-		osExecutableDir := filepath.Dir(osExecutable)
-
-		// Force a working directory different than the executable.
-		cwd, err := ioutil.TempDir("", "")
-		require.NoError(t, err)
-		defer os.RemoveAll(cwd)
-
-		prevDir, err := os.Getwd()
-		require.NoError(t, err)
-		defer os.Chdir(prevDir)
-		os.Chdir(cwd)
-
-		testCases := []struct {
-			Description  string
-			RelativePath string
-		}{
-			{
-				"config/config.json",
-				".",
-			},
-			{
-				"../config/config.json",
-				"../",
-			},
-		}
+	assert.Equal(t, path, FindConfigFile(path))
 
-		for _, testCase := range testCases {
-			t.Run(testCase.Description, func(t *testing.T) {
-				// Install the config in config/config.json relative to the executable
-				configJson := filepath.Join(osExecutableDir, testCase.RelativePath, "config", "config.json")
-				require.NoError(t, os.Mkdir(filepath.Dir(configJson), 0700))
-				require.NoError(t, ioutil.WriteFile(configJson, []byte("{}"), 0600))
-				defer os.RemoveAll(filepath.Dir(configJson))
-
-				// Relative paths end up getting symlinks fully resolved.
-				configJsonResolved, err := filepath.EvalSymlinks(configJson)
-				require.NoError(t, err)
-
-				assert.Equal(t, configJsonResolved, FindConfigFile("config.json"))
-			})
-		}
-	})
+	prevDir, err := os.Getwd()
+	require.NoError(t, err)
+	defer os.Chdir(prevDir)
+	os.Chdir(dir)
+	assert.Equal(t, path, FindConfigFile(path))
 }
 
 func TestConfigFromEnviroVars(t *testing.T) {