1 files changed, 60 insertions, 0 deletions
diff --git a/internal/executable/executable.go b/internal/executable/executable.go
new file mode 100644
index 0000000..c6355b9
--- /dev/null
+++ b/internal/executable/executable.go
@@ -0,0 +1,60 @@
+package executable
+
+import (
+	"os"
+	"path/filepath"
+)
+
+const (
+	BinDir                    = "bin"
+	Healthcheck               = "check"
+	GitlabShell               = "gitlab-shell"
+	AuthorizedKeysCheck       = "gitlab-shell-authorized-keys-check"
+	AuthorizedPrincipalsCheck = "gitlab-shell-authorized-principals-check"
+)
+
+type Executable struct {
+	Name    string
+	RootDir string
+}
+
+var (
+	// osExecutable is overridden in tests
+	osExecutable = os.Executable
+)
+
+func New(name string) (*Executable, error) {
+	path, err := osExecutable()
+	if err != nil {
+		return nil, err
+	}
+
+	rootDir, err := findRootDir(path)
+	if err != nil {
+		return nil, err
+	}
+
+	executable := &Executable{
+		Name:    name,
+		RootDir: rootDir,
+	}
+
+	return executable, nil
+}
+
+func findRootDir(path string) (string, error) {
+	// Start: /opt/.../gitlab-shell/bin/gitlab-shell
+	// Ends:  /opt/.../gitlab-shell
+	rootDir := filepath.Dir(filepath.Dir(path))
+	pathFromEnv := os.Getenv("GITLAB_SHELL_DIR")
+
+	if pathFromEnv != "" {
+		if _, err := os.Stat(pathFromEnv); os.IsNotExist(err) {
+			return "", err
+		}
+
+		rootDir = pathFromEnv
+	}
+
+	return rootDir, nil
+}