Enable -Wwrite-strings

Also, fix leak from ztest_global_vars_to_zdb_args()

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13348

tests/zfs-tests/cmd/ctime.c

@@ -51,7 +51,7 @@
 
 typedef struct timetest {
 	int	type;
-	char	*name;
+	const char	*name;
 	int	(*func)(const char *pfile);
 } timetest_t;
 
@@ -260,7 +260,7 @@ static int
 do_xattr(const char *pfile)
 {
 	int ret = 0;
-	char *value = "user.value";
+	const char *value = "user.value";
 
 	if (pfile == NULL) {
 		return (-1);
@@ -306,7 +306,7 @@ int
 main(void)
 {
 	int i, ret, fd;
-	char *penv[] = {"TESTDIR", "TESTFILE0"};
+	const char *penv[] = {"TESTDIR", "TESTFILE0"};
 
 	(void) atexit(cleanup);
 

tests/zfs-tests/cmd/dir_rd_update.c

@@ -47,7 +47,7 @@ static char dirpath[256];
 int
 main(int argc, char **argv)
 {
-	char *cp1 = "";
+	const char *cp1 = "";
 	int i = 0;
 	int ret = 0;
 	int testdd = 0;

tests/zfs-tests/cmd/draid.c

@@ -130,7 +130,7 @@ read_map(const char *filename, nvlist_t **allcfgs)
  * for freeing the configuration returned.
  */
 static int
-read_map_key(const char *filename, char *key, nvlist_t **cfg)
+read_map_key(const char *filename, const char *key, nvlist_t **cfg)
 {
 	nvlist_t *allcfgs, *foundcfg = NULL;
 	int error;
@@ -320,8 +320,8 @@ write_map_key(const char *filename, char *key, draid_map_t *map,
 }
 
 static void
-dump_map(draid_map_t *map, char *key, double worst_ratio, double avg_ratio,
-    int verbose)
+dump_map(draid_map_t *map, const char *key, double worst_ratio,
+    double avg_ratio, int verbose)
 {
 	if (verbose == 0) {
 		return;
@@ -363,7 +363,7 @@ dump_map(draid_map_t *map, char *key, double worst_ratio, double avg_ratio,
 }
 
 static void
-dump_map_nv(char *key, nvlist_t *cfg, int verbose)
+dump_map_nv(const char *key, nvlist_t *cfg, int verbose)
 {
 	draid_map_t map;
 	uint_t c;
@@ -385,7 +385,7 @@ dump_map_nv(char *key, nvlist_t *cfg, int verbose)
  * Print a summary of the mapping.
  */
 static int
-dump_map_key(const char *filename, char *key, int verbose)
+dump_map_key(const char *filename, const char *key, int verbose)
 {
 	nvlist_t *cfg;
 	int error;

tests/zfs-tests/cmd/get_diff.c

@@ -25,10 +25,9 @@
 #include <errno.h>
 
 static void
-usage(char *msg, int exit_value)
+usage(const char *msg, int exit_value)
 {
-	(void) fprintf(stderr, "get_diff file redacted_file\n");
-	(void) fprintf(stderr, "%s\n", msg);
+	(void) fprintf(stderr, "usage: get_diff file redacted_file\n%s\n", msg);
 	exit(exit_value);
 }
 

tests/zfs-tests/cmd/libzfs_input_check.c

@@ -596,13 +596,13 @@ test_channel_program(const char *pool)
 	    "arg = ...\n"
 	    "argv = arg[\"argv\"]\n"
 	    "return argv[1]";
-	char *const argv[1] = { "Hello World!" };
+	const char *const argv[1] = { "Hello World!" };
 	nvlist_t *required = fnvlist_alloc();
 	nvlist_t *optional = fnvlist_alloc();
 	nvlist_t *args = fnvlist_alloc();
 
 	fnvlist_add_string(required, "program", program);
-	fnvlist_add_string_array(args, "argv", (const char * const *)argv, 1);
+	fnvlist_add_string_array(args, "argv", argv, 1);
 	fnvlist_add_nvlist(required, "arg", args);
 
 	fnvlist_add_boolean_value(optional, "sync", B_TRUE);

tests/zfs-tests/cmd/mkbusy.c

@@ -32,14 +32,14 @@
 
 
 static __attribute__((noreturn)) void
-usage(char *progname)
+usage(const char *progname)
 {
 	(void) fprintf(stderr, "Usage: %s <dirname|filename>\n", progname);
 	exit(1);
 }
 
 static __attribute__((noreturn)) void
-fail(char *err)
+fail(const char *err)
 {
 	perror(err);
 	exit(1);

tests/zfs-tests/cmd/mkfiles.c

@@ -21,13 +21,11 @@
 #include <unistd.h>
 #include <sys/param.h>
 
-#define	MAX_INT_LENGTH 10
-
 static void
-usage(char *msg, int exit_value)
+usage(const char *msg, int exit_value)
 {
-	(void) fprintf(stderr, "mkfiles basename max_file [min_file]\n");
-	(void) fprintf(stderr, "%s\n", msg);
+	(void) fprintf(stderr, "usage: mkfiles basename max_file [min_file]\n"
+	    "%s\n", msg);
 	exit(exit_value);
 }
 
@@ -40,13 +38,13 @@ main(int argc, char **argv)
 	char buf[MAXPATHLEN];
 
 	if (argc < 3 || argc > 4)
-		usage("Invalid number of arguments", -1);
+		usage("Invalid number of arguments", 1);
 
 	if (sscanf(argv[2], "%u", &numfiles) != 1)
-		usage("Invalid maximum file", -2);
+		usage("Invalid maximum file", 2);
 
 	if (argc == 4 && sscanf(argv[3], "%u", &first_file) != 1)
-		usage("Invalid first file", -3);
+		usage("Invalid first file", 3);
 
 	for (i = first_file; i < first_file + numfiles; i++) {
 		int fd;
@@ -54,11 +52,11 @@ main(int argc, char **argv)
 		if ((fd = open(buf, O_CREAT | O_EXCL, O_RDWR)) == -1) {
 			(void) fprintf(stderr, "Failed to create %s %s\n", buf,
 			    strerror(errno));
-			return (-4);
+			return (4);
 		} else if (fchown(fd, getuid(), getgid()) < 0) {
 			(void) fprintf(stderr, "Failed to chown %s %s\n", buf,
 			    strerror(errno));
-			return (-5);
+			return (5);
 		}
 		(void) close(fd);
 	}

tests/zfs-tests/cmd/mktree.c

@@ -153,7 +153,7 @@ crtfile(char *pname)
 {
 	int fd = -1;
 	int i, size;
-	char *context = "0123456789ABCDF";
+	const char *context = "0123456789ABCDF";
 	char *pbuf;
 
 	if (pname == NULL) {

tests/zfs-tests/cmd/nvlist_to_lua.c

@@ -84,7 +84,7 @@ nvlist_equal(nvlist_t *nvla, nvlist_t *nvlb)
 static void
 test(const char *testname, boolean_t expect_success, boolean_t expect_match)
 {
-	char *progstr = "input = ...; return {output=input}";
+	const char *progstr = "input = ...; return {output=input}";
 
 	nvlist_t *outnvl;
 
@@ -230,8 +230,8 @@ run_tests(void)
 		test("uint64_array", B_FALSE, B_FALSE);
 	}
 	{
-		char *const val[2] = { "0", "1" };
-		fnvlist_add_string_array(nvl, key, (const char **)val, 2);
+		const char *val[2] = { "0", "1" };
+		fnvlist_add_string_array(nvl, key, val, 2);
 		test("string_array", B_TRUE, B_FALSE);
 	}
 	{

tests/zfs-tests/cmd/readmmap.c

@@ -49,7 +49,7 @@
 int
 main(int argc, char **argv)
 {
-	char *filename = "badfile";
+	const char *filename = "badfile";
 	size_t size = 4395;
 	size_t idx = 0;
 	char *buf = NULL;

tests/zfs-tests/cmd/stride_dd.c

@@ -27,7 +27,7 @@ static char *ifile = NULL;
 static char *ofile = NULL;
 static int stride = 0;
 static int seek = 0;
-static char *execname = "stride_dd";
+static const char *execname = "stride_dd";
 
 static void usage(void);
 static void parse_options(int argc, char *argv[]);

tests/zfs-tests/cmd/xattrtest.c

@@ -91,8 +91,8 @@ static int size_is_random = 0;
 static int value_is_random = 0;
 static int keep_files = 0;
 static int phase = PHASE_ALL;
-static char path[PATH_MAX] = "/tmp/xattrtest";
-static char script[PATH_MAX] = "/bin/true";
+static const char *path = "/tmp/xattrtest";
+static const char *script = "/bin/true";
 static char xattrbytes[XATTR_SIZE_MAX];
 
 static int
@@ -161,8 +161,7 @@ parse_args(int argc, char **argv)
 			}
 			break;
 		case 'p':
-			strncpy(path, optarg, PATH_MAX);
-			path[PATH_MAX - 1] = '\0';
+			path = optarg;
 			break;
 		case 'c':
 			synccaches = 1;
@@ -171,8 +170,7 @@ parse_args(int argc, char **argv)
 			dropcaches = 1;
 			break;
 		case 't':
-			strncpy(script, optarg, PATH_MAX);
-			script[PATH_MAX - 1] = '\0';
+			script = optarg;
 			break;
 		case 'e':
 			seed = strtol(optarg, NULL, 0);
@@ -291,9 +289,9 @@ run_process(const char *path, char *argv[])
 }
 
 static int
-post_hook(char *phase)
+post_hook(const char *phase)
 {
-	char *argv[3] = { script, phase, (char *)0 };
+	char *argv[3] = { (char *)script, (char *)phase, NULL };
 	int rc;
 
 	if (synccaches)
@@ -517,9 +515,9 @@ getxattrs(void)
 	int i, j, rnd_size, shift, rc = 0;
 	char name[XATTR_NAME_MAX];
 	char *verify_value = NULL;
-	char *verify_string;
+	const char *verify_string;
 	char *value = NULL;
-	char *value_string;
+	const char *value_string;
 	char *file = NULL;
 	struct timeval start, stop;
 	double seconds;