path-lookup: move find_portable_profile() to portable-util

src/shared/meson.build

@@ -144,6 +144,7 @@ shared_sources = files(
         'pkcs11-util.c',
         'plymouth-util.c',
         'polkit-agent.c',
+        'portable-util.c',
         'pretty-print.c',
         'capsule-util.c',
         'ptyfwd.c',

src/shared/portable-util.c

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "fs-util.h"
+#include "nulstr-util.h"
+#include "portable-util.h"
+#include "string-util.h"
+
+int find_portable_profile(const char *name, const char *unit, char **ret_path) {
+        const char *dot;
+        int r;
+
+        assert(name);
+        assert(ret_path);
+
+        assert_se(dot = strrchr(unit, '.'));
+
+        NULSTR_FOREACH(p, PORTABLE_PROFILE_DIRS) {
+                _cleanup_free_ char *joined = NULL;
+
+                joined = strjoin(p, "/", name, "/", dot + 1, ".conf");
+                if (!joined)
+                        return -ENOMEM;
+
+                r = access_nofollow(joined, F_OK);
+                if (r >= 0) {
+                        *ret_path = TAKE_PTR(joined);
+                        return 0;
+                }
+                if (r != -ENOENT)
+                        return r;
+        }
+
+        return -ENOENT;
+}

src/shared/portable-util.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "constants.h"
+#include "macro.h"
+
+#define PORTABLE_PROFILE_DIRS CONF_PATHS_NULSTR("systemd/portable/profile")
+
+int find_portable_profile(const char *name, const char *unit, char **ret_path);