Initial commit

Basic project layout, some initial code

internal/util/directories.go

@@ -0,0 +1,118 @@
+package util
+
+import (
+	"os"
+	"path/filepath"
+)
+
+type AppPaths struct {
+	SchemaDir    string
+	DatabaseFile string
+}
+
+func executableDir() (string, error) {
+	myExecutable, err := os.Executable()
+	if err != nil {
+		return "", err
+	}
+
+	myExecutable, err = filepath.EvalSymlinks(myExecutable)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Dir(myExecutable), nil
+}
+
+func isSystemInstall(myDir string) (bool, error) {
+	if myDir != "/bin" && myDir != "/usr/bin" {
+		return false, nil
+	}
+	return true, nil
+}
+
+func isSystemLocalInstall(myDir string) (bool, error) {
+	if myDir != "/usr/local/bin" {
+		return false, nil
+	}
+	return true, nil
+}
+
+func isUserLocalInstall(myDir string) (bool, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return false, err
+	}
+
+	if myDir != filepath.Join(home, ".local/bin") {
+		return false, nil
+	}
+	return true, nil
+}
+
+func findDefaultDirectories() (*AppPaths, error) {
+	myDir, err := executableDir()
+	if err != nil {
+		return nil, err
+	}
+
+	if system, err := isSystemInstall(myDir); err != nil {
+		return nil, err
+	} else if system {
+		return &AppPaths{
+			SchemaDir:    "/usr/share/linkshare/schema",
+			DatabaseFile: "/var/lib/linkshare/linkshare.db",
+		}, nil
+	}
+
+	if local, err := isSystemLocalInstall(myDir); err != nil {
+		return nil, err
+	} else if local {
+		return &AppPaths{
+			SchemaDir:    "/usr/local/share/linkshare/schema",
+			DatabaseFile: "/var/lib/linkshare/linkshare.db",
+		}, nil
+	}
+
+	if user, err := isUserLocalInstall(myDir); err != nil {
+		return nil, err
+	} else if user {
+		return &AppPaths{
+			SchemaDir:    filepath.Join(myDir, "../share/linkshare/"),
+			DatabaseFile: filepath.Join(myDir, "../var/lib/linkshare/linkshare.db"),
+		}, nil
+	}
+
+	return &AppPaths{
+		SchemaDir:    filepath.Join(myDir, "../schema"),
+		DatabaseFile: filepath.Join(myDir, "../linkshare.db"),
+	}, nil
+}
+
+// FindDirectories will find all relevant directories.
+// It checks where the binary is installed and based on that it will decide
+// where to look for other static data.
+//
+// Parameters:
+//   - dbPath: the explicit db path passed on the command line. If this contains
+//     a non-empty string the db returned database file will always be this one.
+//     If this contains an empty string a default database file will be picked
+//     based on where the binary is installed.
+func FindDirectories(dbPath string) (*AppPaths, error) {
+	paths, err := findDefaultDirectories()
+	if err != nil {
+		return nil, err
+	}
+	if dbPath != "" {
+		paths.DatabaseFile = dbPath
+	}
+	return paths, nil
+}
+
+// CreateDirectories ensures all application managed directories are created
+func CreateDirectories(paths *AppPaths) error {
+	err := os.MkdirAll(filepath.Dir(paths.DatabaseFile), 0750)
+	if err != nil {
+		return err
+	}
+	return nil
+}