From 9367af8a295ed0a998bbfe780f96dd1bf101559d Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 7 Nov 2023 18:19:25 +0100
Subject: [PATCH] util: add capsule-util.[ch] with helpers for capsules

For now, there's only a routine for validating capsule names. More will
be added later.
---
 src/shared/capsule-util.c | 17 +++++++++++++++++
 src/shared/capsule-util.h |  4 ++++
 src/shared/meson.build    |  1 +
 3 files changed, 22 insertions(+)
 create mode 100644 src/shared/capsule-util.c
 create mode 100644 src/shared/capsule-util.h

diff --git a/src/shared/capsule-util.c b/src/shared/capsule-util.c
new file mode 100644
index 0000000000..3689a78a8b
--- /dev/null
+++ b/src/shared/capsule-util.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "capsule-util.h"
+#include "path-util.h"
+#include "user-util.h"
+
+int capsule_name_is_valid(const char *name) {
+
+        if (!filename_is_valid(name))
+                return false;
+
+        _cleanup_free_ char *prefixed = strjoin("c-", name);
+        if (!prefixed)
+                return -ENOMEM;
+
+        return valid_user_group_name(prefixed, /* flags= */ 0);
+}
diff --git a/src/shared/capsule-util.h b/src/shared/capsule-util.h
new file mode 100644
index 0000000000..437153be9e
--- /dev/null
+++ b/src/shared/capsule-util.h
@@ -0,0 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+int capsule_name_is_valid(const char *name);
diff --git a/src/shared/meson.build b/src/shared/meson.build
index d540631f21..11f2b5ade9 100644
--- a/src/shared/meson.build
+++ b/src/shared/meson.build
@@ -140,6 +140,7 @@ shared_sources = files(
         'pkcs11-util.c',
         'plymouth-util.c',
         'pretty-print.c',
+        'capsule-util.c',
         'ptyfwd.c',
         'qrcode-util.c',
         'quota-util.c',
-- 
2.25.1