1 files changed, 105 insertions, 0 deletions
diff --git a/libmount/src/init.c b/libmount/src/init.c
new file mode 100644
index 0000000..a229222
--- /dev/null
+++ b/libmount/src/init.c
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * This file is part of libmount from util-linux project.
+ *
+ * Copyright (C) 2008-2018 Karel Zak <kzak@redhat.com>
+ *
+ * libmount is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+/**
+ * SECTION: init
+ * @title: Library initialization
+ * @short_description: initialize debugging
+ */
+
+#include <stdarg.h>
+
+#include "mountP.h"
+
+UL_DEBUG_DEFINE_MASK(libmount);
+UL_DEBUG_DEFINE_MASKNAMES(libmount) =
+{
+	{ "all", MNT_DEBUG_ALL,		"info about all subsystems" },
+	{ "cache", MNT_DEBUG_CACHE,	"paths and tags cache" },
+	{ "cxt", MNT_DEBUG_CXT,		"library context (handler)" },
+	{ "diff", MNT_DEBUG_DIFF,	"mountinfo changes tracking" },
+	{ "fs", MNT_DEBUG_FS,		"FS abstraction" },
+	{ "help", MNT_DEBUG_HELP,	"this help" },
+	{ "locks", MNT_DEBUG_LOCKS,	"mtab and utab locking" },
+	{ "loop", MNT_DEBUG_LOOP,	"loop devices routines" },
+	{ "options", MNT_DEBUG_OPTIONS,	"mount options parsing" },
+	{ "tab", MNT_DEBUG_TAB,		"fstab, mtab, mountinfo routines" },
+	{ "update", MNT_DEBUG_UPDATE,	"mtab, utab updates" },
+	{ "utils", MNT_DEBUG_UTILS,	"misc library utils" },
+	{ "monitor", MNT_DEBUG_MONITOR,	"mount tables monitor" },
+	{ "btrfs", MNT_DEBUG_BTRFS,	"btrfs specific routines" },
+
+	{ NULL, 0 }
+};
+
+/**
+ * mnt_init_debug:
+ * @mask: debug mask (0xffff to enable full debugging)
+ *
+ * If the @mask is not specified, then this function reads
+ * the LIBMOUNT_DEBUG environment variable to get the mask.
+ *
+ * Already initialized debugging stuff cannot be changed. Calling
+ * this function twice has no effect.
+ */
+void mnt_init_debug(int mask)
+{
+	if (libmount_debug_mask)
+		return;
+
+	__UL_INIT_DEBUG_FROM_ENV(libmount, MNT_DEBUG_, mask, LIBMOUNT_DEBUG);
+
+	if (libmount_debug_mask != MNT_DEBUG_INIT
+	    && libmount_debug_mask != (MNT_DEBUG_HELP|MNT_DEBUG_INIT)) {
+		const char *ver = NULL;
+		const char **features = NULL, **p;
+
+		mnt_get_library_version(&ver);
+		mnt_get_library_features(&features);
+
+		DBG(INIT, ul_debug("library debug mask: 0x%04x", libmount_debug_mask));
+		DBG(INIT, ul_debug("library version: %s", ver));
+		p = features;
+		while (p && *p)
+			DBG(INIT, ul_debug("    feature: %s", *p++));
+	}
+
+	ON_DBG(HELP, ul_debug_print_masks("LIBMOUNT_DEBUG",
+				UL_DEBUG_MASKNAMES(libmount)));
+}
+
+#ifdef TEST_PROGRAM
+
+#include <errno.h>
+#include <stdlib.h>
+int main(int argc, char *argv[])
+{
+	if (argc == 2) {
+		int mask;
+
+		errno = 0;
+		mask = strtoul(argv[1], 0, 0);
+
+		if (errno)
+			return 1;
+
+		mnt_init_debug(mask);
+	}
+	else if (argc == 1) {
+		mnt_init_debug(0);
+	} else
+		return 1;
+
+	return 0;
+}
+#endif /* TEST_PROGRAM */
+