chore(libmain): license it under LGPL-2.1-only

Progress towards REUSE compliance.

Change-Id: I2991234cfd193773a377d2f1735b9974918b8138
Signed-off-by: Raito Bezarius <raito@lix.systems>

src/libmain/common-args.cc

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #include "common-args.hh"
 #include "args/root.hh"
 #include "error.hh"

src/libmain/common-args.hh

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #pragma once
 ///@file
 

src/libmain/loggers.cc

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #include "environment-variables.hh"
 #include "loggers.hh"
 #include "progress-bar.hh"

src/libmain/loggers.hh

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #pragma once
 ///@file
 

src/libmain/meson.build

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+#
+# SPDX-License-Identifier: LGPL-2.1-only
+
 libmain_sources = files(
   'common-args.cc',
   'loggers.cc',

src/libmain/progress-bar.cc

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #include "progress-bar.hh"
 #include "sync.hh"
 #include "store-api.hh"

src/libmain/progress-bar.hh

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #pragma once
 ///@file
 

src/libmain/shared.cc

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #include "globals.hh"
 #include "shared.hh"
 #include "store-api.hh"

src/libmain/shared.hh

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #pragma once
 ///@file
 

src/libmain/stack.cc

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2024 Nix and Lix Authors
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
 #include "error.hh"
 #include "shared.hh"