Add crypt_wipe unit test.

It uses simple C wrapper aroung crypt_wipe() libcryptsetup
and then bash test scripts wipung simple file and block device.

tests/unit-wipe.c

@@ -0,0 +1,131 @@
+/*
+ * unit test helper for crypt_wipe API call
+ *
+ * Copyright (C) 2022 Milan Broz
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "libcryptsetup.h"
+
+const char *test_file;
+uint64_t test_offset, test_length, test_block;
+uint32_t flags;
+crypt_wipe_pattern pattern;
+
+static void usage(void)
+{
+	fprintf(stderr, "Use:\tunit-wipe file/device zero|random|special offset length bsize [no-dio].\n");
+}
+
+static bool parse_u64(const char *arg, uint64_t *u64)
+{
+	unsigned long long ull;
+	char *end;
+
+	ull = strtoull(arg, &end, 10);
+	if (*end || !*arg || errno == ERANGE)
+		return false;
+
+	if (ull % 512)
+		return false;
+
+	*u64 = ull;
+	return true;
+}
+
+static bool parse_input_params(int argc, char **argv)
+{
+	struct stat st;
+
+	if (argc < 6 || argc > 7) {
+		usage();
+		return false;
+	}
+
+	if (stat(argv[1], &st)) {
+		fprintf(stderr, "File/device %s is missing?\n", argv[1]);
+		return false;
+	}
+	test_file = argv[1];
+
+	if (!strcmp(argv[2], "random"))
+		pattern = CRYPT_WIPE_RANDOM;
+	else if (!strcmp(argv[2], "zero"))
+		pattern = CRYPT_WIPE_ZERO;
+	else if (!strcmp(argv[2], "special"))
+		pattern = CRYPT_WIPE_SPECIAL;
+	else {
+		fprintf(stderr, "Wrong pattern specification.\n");
+		return false;
+	}
+
+	if (!parse_u64(argv[3], &test_offset)) {
+		fprintf(stderr, "Wrong offset specification.\n");
+		return false;
+	}
+
+	if (!parse_u64(argv[4], &test_length)) {
+		fprintf(stderr, "Wrong length specification.\n");
+		return false;
+	}
+
+	if (!parse_u64(argv[5], &test_block)) {
+		fprintf(stderr, "Wrong block length specification.\n");
+		return false;
+	}
+
+	if (argc > 6) {
+		if (!strcmp(argv[6], "no-dio"))
+			flags = CRYPT_WIPE_NO_DIRECT_IO;
+		else {
+			fprintf(stderr, "Wrong flags specification.\n");
+			return false;
+		}
+	}
+
+	return true;
+}
+
+int main(int argc, char **argv)
+{
+	struct crypt_device *cd;
+	int r;
+
+	if (!parse_input_params(argc, argv))
+		return EXIT_FAILURE;
+
+	r = crypt_init(&cd, NULL);
+	if (r < 0) {
+		fprintf(stderr, "Context init failure %i.\n", r);
+		return EXIT_FAILURE;
+	}
+
+	r = crypt_wipe(cd, test_file, pattern, test_offset, test_length,
+		       test_block, flags, NULL, NULL);
+	crypt_free(cd);
+
+	if (r)
+		fprintf(stderr, "Failure %i\n", r);
+
+	return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}