Differential D25512 Diff 73889 sbin/zfsbootcfg/zfsbootcfg.c

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sbin/zfsbootcfg/zfsbootcfg.c

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	#include <sys/types.h>			#include <sys/types.h>
	#include <errno.h>			#include <errno.h>
	#include <limits.h>			#include <limits.h>
	#include <inttypes.h>			#include <inttypes.h>
	#include <stdio.h>			#include <stdio.h>
	#include <stdlib.h>			#include <stdlib.h>
	#include <string.h>			#include <string.h>
				#include <sys/nvpair.h>
	#include <kenv.h>			#include <kenv.h>

	#include <libzfs.h>			#include <libzfs.h>

	/* Keep in sync with zfsboot.c. */			/* Keep in sync with zfsboot.c. */
	#define MAX_COMMAND_LEN 512			#define MAX_COMMAND_LEN 512

	int			int main(int argc, char * const *argv)
				impUnsubmitted Done Inline Actions nit: int should be on a line by itself... imp: nit: int should be on a line by itself...
	install_bootonce(libzfs_handle_t hdl, uint64_t pool_guid, nvlist_t nv,
	const char * const data)
	{			{
	nvlist_t **child;			char buf[MAX_COMMAND_LEN], *name;
	uint_t children = 0;			const char key, value;
	uint64_t guid;			libzfs_handle_t *hdl;
				zpool_handle_t *zphdl;
				nvlist_t *nv;
				nvpair_t *nvp;
	int rv;			int rv;
				int len;
				bool print = false;

	(void) nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, &child,			key = "command";
	&children);			value = NULL;
				print = 0;
	for (int c = 0; c < children; c++) {			while ((rv = getopt(argc, argv, "k:v:p")) != -1) {
	rv = install_bootonce(hdl, pool_guid, child[c], data);			switch (rv) {
				allanjudeUnsubmitted Done Inline Actions I think for backwards compatibility, we need to make print the default if 0 args are specified so running just 'zfsbootcfg' prints the currently selected bootenv (this is what it did before our changes) allanjude: I think for backwards compatibility, we need to make print the default if 0 args are specified…
				tsoomeAuthorUnsubmitted Done Inline Actions Actually it did not, it did require argc == 2 and only wrote the argument string to pad2:) but the idea is still OK tsoome: Actually it did not, it did require argc == 2 and only wrote the argument string to pad2:) but…
				case 'k':
				key = optarg;
				break;
				case 'v':
				value = optarg;
				break;
				case 'p':
				print = true;
	}			}

	if (children > 0)
	return (rv);

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) {
	perror("can't get vdev guid");
	return (1);
	}			}
	if (zpool_nextboot(hdl, pool_guid, guid, data) != 0) {
	perror("ZFS_IOC_NEXTBOOT failed");
	return (1);
	}
	return (0);
	}

	int main(int argc, const char * const *argv)			argc -= optind;
	{			argv += optind;
	char buf[32], *name;
	libzfs_handle_t *hdl;
	zpool_handle_t *zphdl;
	uint64_t pool_guid;
	nvlist_t nv, config;
	int rv;
	int len;

	if (argc != 2) {			if (argc == 1)
				value = argv[0];

				if (argc > 1) {
	fprintf(stderr, "usage: zfsbootcfg <boot.config(5) options>\n");			fprintf(stderr, "usage: zfsbootcfg <boot.config(5) options>\n");
	return (1);			return (1);
	}			}

	len = strlen(argv[1]);
	if (len >= MAX_COMMAND_LEN) {
	fprintf(stderr, "options string is too long\n");
	return (1);
	}

	if (kenv(KENV_GET, "vfs.root.mountfrom", buf, sizeof(buf)) <= 0) {			if (kenv(KENV_GET, "vfs.root.mountfrom", buf, sizeof(buf)) <= 0) {
	perror("can't get vfs.root.mountfrom");			perror("can't get vfs.root.mountfrom");
	return (1);			return (1);
	}			}

	if (strncmp(buf, "zfs:", 4) == 0) {			if (strncmp(buf, "zfs:", 4) == 0) {
	name = strchr(buf + 4, '/');			name = strchr(buf + 4, '/');
	if (name != NULL)			if (name != NULL)
	*name = '\0';			*name = '\0';
	name = buf + 4;			name = buf + 4;
	} else {			} else {
	perror("not a zfs root");			perror("not a zfs root");
	return (1);			return (1);
	}			}

	if ((hdl = libzfs_init()) == NULL) {			if ((hdl = libzfs_init()) == NULL) {
	(void) fprintf(stderr, "internal error: failed to "			(void) fprintf(stderr, "internal error: failed to "
	"initialize ZFS library\n");			"initialize ZFS library\n");
	return (1);			return (1);
	}			}

				libzfs_print_on_error(hdl, B_TRUE);

	zphdl = zpool_open(hdl, name);			zphdl = zpool_open(hdl, name);
	if (zphdl == NULL) {			if (zphdl == NULL) {
	perror("can't open pool");			perror("can't open pool");
	libzfs_fini(hdl);			libzfs_fini(hdl);
	return (1);			return (1);
	}			}

	pool_guid = zpool_get_prop_int(zphdl, ZPOOL_PROP_GUID, NULL);			if (value != NULL) {
				len = strlen(value);
				if (len >= MAX_COMMAND_LEN) {
				fprintf(stderr, "options string is too long\n");
				} else {
				rv = zpool_get_bootenv(zphdl, &nv);
				if (rv != 0)
				nv = fnvlist_alloc();

	config = zpool_get_config(zphdl, NULL);			if (value[0] == '\0')
	if (config == NULL) {			fnvlist_remove(nv, key);
	perror("can't get pool config");			else
	zpool_close(zphdl);			fnvlist_add_string(nv, key, value);
	libzfs_fini(hdl);
	return (1);
	}

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) != 0) {			rv = zpool_set_bootenv(zphdl, nv);
	perror("failed to get vdev tree");			if (rv == 0)
	zpool_close(zphdl);			printf("zfs next boot options are successfully written\n");
	libzfs_fini(hdl);			else
	return (1);			printf("error: %d\n", rv);
				fnvlist_free(nv);
	}			}
				}

	rv = install_bootonce(hdl, pool_guid, nv, argv[1]);			if (print) {
				rv = zpool_get_bootenv(zphdl, &nv);
				if (rv == 0) {
				nvp = NULL;
				while (nvp = nvlist_next_nvpair(nv, nvp)) {
				char *ptr;

				printf("%s: ", nvpair_name(nvp));
				switch (nvpair_type(nvp)) {
				case DATA_TYPE_STRING:
				nvpair_value_string(nvp, &ptr);
				printf("%s\n", ptr);
				break;
				default:
				break;
				}
				}
				}
				fnvlist_free(nv);
				}

	zpool_close(zphdl);			zpool_close(zphdl);
	libzfs_fini(hdl);			libzfs_fini(hdl);
	if (rv == 0)
	printf("zfs next boot options are successfully written\n");
	return (rv);			return (rv);
	}			}