util: move src/basic/creds-util.[ch] → src/shared/

This is preparation for adding encryption support to the credentials
logic, and we thus would like to add more deps. Let's hence move things
from src/basic/ to src/shared, so that we can rely on the OpenSSL
utilities already in src/shared.

src/basic/creds-util.c

@@ -1,54 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-
-#include "creds-util.h"
-#include "fd-util.h"
-#include "fileio.h"
-#include "path-util.h"
-
-bool credential_name_valid(const char *s) {
-        /* We want that credential names are both valid in filenames (since that's our primary way to pass
-         * them around) and as fdnames (which is how we might want to pass them around eventually) */
-        return filename_is_valid(s) && fdname_is_valid(s);
-}
-
-int get_credentials_dir(const char **ret) {
-        const char *e;
-
-        assert(ret);
-
-        e = secure_getenv("CREDENTIALS_DIRECTORY");
-        if (!e)
-                return -ENXIO;
-
-        if (!path_is_absolute(e) || !path_is_normalized(e))
-                return -EINVAL;
-
-        *ret = e;
-        return 0;
-}
-
-int read_credential(const char *name, void **ret, size_t *ret_size) {
-        _cleanup_free_ char *fn = NULL;
-        const char *d;
-        int r;
-
-        assert(ret);
-
-        if (!credential_name_valid(name))
-                return -EINVAL;
-
-        r = get_credentials_dir(&d);
-        if (r < 0)
-                return r;
-
-        fn = path_join(d, name);
-        if (!fn)
-                return -ENOMEM;
-
-        return read_full_file_full(
-                        AT_FDCWD, fn,
-                        UINT64_MAX, SIZE_MAX,
-                        READ_FULL_FILE_SECURE,
-                        NULL,
-                        (char**) ret, ret_size);
-}

src/basic/creds-util.h

@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-#pragma once
-
-#include <inttypes.h>
-#include <stdbool.h>
-#include <sys/types.h>
-
-#include "fd-util.h"
-
-#define CREDENTIAL_NAME_MAX FDNAME_MAX
-
-bool credential_name_valid(const char *s);
-
-int get_credentials_dir(const char **ret);
-
-int read_credential(const char *name, void **ret, size_t *ret_size);

src/basic/meson.build

@@ -29,8 +29,6 @@ basic_sources = files('''
         chattr-util.h
         conf-files.c
         conf-files.h
-        creds-util.c
-        creds-util.h
         def.h
         dirent-util.c
         dirent-util.h