host tags

doc/example.conf

@@ -219,6 +219,14 @@ activation {
 
     # Nice value used while devices suspended
     process_priority = -18
+
+    # If volume_list is defined, each LV is only activated if there is a
+    # match against the list.
+    #   "vgname" and "vgname/lvname" are matched exactly.
+    #   "@tag" matches any tag set in the LV or VG.
+    #   "@*" matches if any tag defined on the host is also set in the LV or VG
+    #
+    # volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
 }
 
 

lib/activate/activate.c

@@ -14,6 +14,7 @@
 #include "pool.h"
 #include "toolcontext.h"
 #include "dev_manager.h"
+#include "str_list.h"
 
 #include <limits.h>
 #include <fcntl.h>
@@ -111,6 +112,87 @@ int activation(void)
 	return _activation;
 }
 
+static int _passes_activation_filter(struct cmd_context *cmd,
+				     struct logical_volume *lv)
+{
+	struct config_node *cn;
+	struct config_value *cv;
+	char *str;
+	char path[PATH_MAX];
+
+	if (!(cn = find_config_node(cmd->cf->root, "activation/volume_list",
+				    '/'))) {
+		/* If no hosts tags defined, activate */
+		if (list_empty(&cmd->tags))
+			return 1;
+
+		/* If any host tag matches any LV or VG tag, activate */
+		if (str_list_match_list(&cmd->tags, &lv->tags) ||
+		    str_list_match_list(&cmd->tags, &lv->vg->tags))
+			return 1;
+
+		/* Don't activate */
+		return 0;
+	}
+
+	for (cv = cn->v; cv; cv = cv->next) {
+		if (cv->type != CFG_STRING) {
+			log_error("Ignoring invalid string in config file "
+				  "activation/volume_list");
+			continue;
+		}
+		str = cv->v.str;
+		if (!*str) {
+			log_error("Ignoring empty string in config file "
+				  "activation/volume_list");
+			continue;
+		}
+
+		/* Tag? */
+		if (*str == '@') {
+			str++;
+			if (!*str) {
+				log_error("Ignoring empty tag in config file "
+					  "activation/volume_list");
+				continue;
+			}
+			/* If any host tag matches any LV or VG tag, activate */
+			if (!strcmp(str, "*")) {
+				if (str_list_match_list(&cmd->tags, &lv->tags)
+				    || str_list_match_list(&cmd->tags,
+							   &lv->vg->tags))
+					    return 1;
+				else
+					continue;
+			}
+			/* If supplied tag matches LV or VG tag, activate */
+			if (str_list_match_item(&lv->tags, str) ||
+			    str_list_match_item(&lv->vg->tags, str))
+				return 1;
+			else
+				continue;
+		}
+		if (!index(str, '/')) {
+			/* vgname supplied */
+			if (!strcmp(str, lv->vg->name))
+				return 1;
+			else
+				continue;
+		}
+		/* vgname/lvname */
+		if (lvm_snprintf(path, sizeof(path), "%s/%s", lv->vg->name,
+				 lv->name) < 0) {
+			log_error("lvm_snprintf error from %s/%s", lv->vg->name,
+				  lv->name);
+			continue;
+		}
+		if (!strcmp(path, str))
+			return 1;
+	}
+
+	return 0;
+}
+
 int library_version(char *version, size_t size)
 {
 	if (!activation())
@@ -466,6 +548,12 @@ int lv_activate(struct cmd_context *cmd, const char *lvid_s)
 	if (!(lv = lv_from_lvid(cmd, lvid_s)))
 		return 0;
 
+	if (!_passes_activation_filter(cmd, lv)) {
+		log_verbose("Not activating %s/%s due to config file settings",
+			    lv->vg->name, lv->name);
+		return 0;
+	}
+
 	if (test_mode()) {
 		_skip("Activating '%s'.", lv->name);
 		return 1;

lib/commands/toolcontext.c

@@ -22,6 +22,7 @@
 #include "format-text.h"
 #include "display.h"
 #include "memlock.h"
+#include "str_list.h"
 
 #ifdef HAVE_LIBDL
 #include "sharedlib.h"
@@ -110,8 +111,12 @@ static void _init_logging(struct cmd_context *cmd)
 		append = 0;
 
 	log_file = find_config_str(cmd->cf->root, "log/file", '/', 0);
-	if (log_file)
+
+	if (log_file) {
+		release_log_memory();
+		fin_log();
 		init_log_file(log_file, append);
+	}
 
 	log_file = find_config_str(cmd->cf->root, "log/activate_file", '/', 0);
 	if (log_file)
@@ -442,6 +447,105 @@ static int _init_hostname(struct cmd_context *cmd)
 	return 1;
 }
 
+static int _set_tag(struct cmd_context *cmd, const char *tag)
+{
+	log_very_verbose("Setting host tag: %s", pool_strdup(cmd->libmem, tag));
+
+	if (!str_list_add(cmd->libmem, &cmd->tags, tag)) {
+		log_error("_init_tags: str_list_add %s failed", tag);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int _check_host_filters(struct cmd_context *cmd, struct config_node *hn,
+			       int *passes)
+{
+	struct config_node *cn;
+	struct config_value *cv;
+
+	*passes = 1;
+
+	for (cn = hn; cn; cn = cn->sib) {
+		if (!cn->v)
+			continue;
+		if (!strcmp(cn->key, "host_list")) {
+			*passes = 0;
+			if (cn->v->type == CFG_EMPTY_ARRAY)
+				continue;
+			for (cv = cn->v; cv; cv = cv->next) {
+				if (cv->type != CFG_STRING) {
+					log_error("Invalid hostname string "
+						  "for tag %s", cn->key);
+					return 0;
+				}
+				if (!strcmp(cv->v.str, cmd->hostname)) {
+					*passes = 1;
+					return 1;
+				}
+			}
+		}
+		if (!strcmp(cn->key, "host_filter")) {
+			log_error("host_filter not supported yet");
+			return 0;
+		}
+	}
+
+	return 1;
+}
+	
+static int _init_tags(struct cmd_context *cmd)
+{
+	struct config_node *tn, *cn;
+	const char *tag;
+	int passes;
+
+	list_init(&cmd->tags);
+
+	if (!(tn = find_config_node(cmd->cf->root, "tags", '/')) ||
+	    !tn->child) {
+		log_very_verbose("No tags defined in config file");
+		return 1;
+	}
+
+	if (find_config_int(cmd->cf->root, "tags/hosttags", '/',
+			    DEFAULT_HOSTTAGS)) {
+		/* FIXME Strip out invalid chars: only A-Za-z0-9_+.- */
+		if (!_set_tag(cmd, cmd->hostname)) {
+			stack;
+			return 0;
+		}
+	}
+
+	for (cn = tn->child; cn; cn = cn->sib) {
+		if (cn->v)
+			continue;
+		tag = cn->key;
+		if (*tag == '@')
+			tag++;
+		if (!validate_name(tag)) {
+			log_error("Invalid tag in config file: %s", cn->key);
+			return 0;
+		}
+		if (cn->child) {
+			passes = 0;
+			if (!_check_host_filters(cmd, cn->child, &passes)) {
+				stack;
+				return 0;
+			}
+			if (!passes)
+				continue;
+		}
+		if (!_set_tag(cmd, tag)) {
+			stack;
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
 /* Entry point */
 struct cmd_context *create_toolcontext(struct arg *the_args)
 {
@@ -509,6 +613,9 @@ struct cmd_context *create_toolcontext(struct arg *the_args)
 	if (!_init_hostname(cmd))
 		goto error;
 
+	if (!_init_tags(cmd))
+		goto error;
+
 	cmd->current_settings = cmd->default_settings;
 
 	return cmd;
@@ -518,6 +625,16 @@ struct cmd_context *create_toolcontext(struct arg *the_args)
 	return NULL;
 }
 
+int refresh_toolcontext(struct cmd_context *cmd)
+{
+	_init_logging(cmd);
+	_init_tags(cmd);
+
+	/* FIXME Reset filters and dev_cache */
+
+	return 1;
+}
+
 static void _destroy_formats(struct list *formats)
 {
 	struct list *fmtl, *tmp;

lib/commands/toolcontext.h

@@ -63,6 +63,9 @@ struct cmd_context {
 	struct config_info default_settings;
 	struct config_info current_settings;
 
+	/* List of defined tags */
+	struct list tags;
+
 	char sys_dir[PATH_MAX];
 	char dev_dir[PATH_MAX];
 	char proc_dir[PATH_MAX];
@@ -70,5 +73,6 @@ struct cmd_context {
 
 struct cmd_context *create_toolcontext(struct arg *the_args);
 void destroy_toolcontext(struct cmd_context *cmd);
+int refresh_toolcontext(struct cmd_context *cmd);
 
 #endif

lib/config/defaults.h

@@ -51,6 +51,7 @@
 #define DEFAULT_INDENT 1
 #define DEFAULT_UNITS "h"
 #define DEFAULT_SUFFIX 1
+#define DEFAULT_HOSTTAGS 0
 
 #ifdef DEVMAPPER_SUPPORT
 #  define DEFAULT_ACTIVATION 1

lib/log/log.c

@@ -47,11 +47,9 @@ void init_log_file(const char *log_file, int append)
 
 void init_log_direct(const char *log_file, int append)
 {
-	const char *filename;
 	int open_flags = append ? 0 : O_TRUNC;
 
-	filename = dbg_strdup(log_file);
+	dev_create_file(log_file, &_log_dev, &_log_dev_alias);
-	dev_create_file(filename, &_log_dev, &_log_dev_alias);
 	if (!dev_open_flags(&_log_dev, O_RDWR | O_CREAT | open_flags, 1, 0))
 		return;
 
@@ -76,6 +74,9 @@ void log_suppress(int suppress)
 
 void release_log_memory(void)
 {
+	if (!_log_direct)
+		return;
+
 	dbg_free((char *) _log_dev_alias.str);
 	_log_dev_alias.str = "activate_log file";
 }

tools/lvm.c

@@ -750,8 +750,11 @@ static int _run_command(struct cmd_context *cmd, int argc, char **argv)
 	set_cmd_name(cmd->command->name);
 
 	if (reload_config_file(&cmd->cf)) {
-		;
+		/* Reinitialise various settings inc. logging, filters */
-		/* FIXME Reinitialise various settings inc. logging, filters */
+		if (!refresh_toolcontext(cmd)) {
+			log_error("Updated config file invalid. Aborting.");
+			return ECMD_FAILED;
+		}
 	}
 
 	if ((ret = _get_settings(cmd)))