Add lookup to create modules list from alias

We return a kmod_list when searching for an alias. Right now, it only
search for aliases in config files.

To use it, we create a list:
	list = NULL;
	kmod_module_new_from_lookup(..., &list);

And iterate over it to get the modules and their details:

	kmod_list_foreach(l, list) {
		struct kmod_mod *mod = kmod_module_get_module(l);
		...
		... kmod_module_get_name(mod);
		... kmod_module_get_path(mod);
	}

Aliases might contain globs and are match by using fnmatch().

libkmod/libkmod-module.c

@@ -33,6 +33,7 @@
 
 #include "libkmod.h"
 #include "libkmod-private.h"
+//#include "libkmod-index.h"
 
 /**
  * kmod_module:
@@ -152,6 +153,40 @@ KMOD_EXPORT struct kmod_module *kmod_module_ref(struct kmod_module *mod)
 	return mod;
 }
 
+KMOD_EXPORT int kmod_module_new_from_lookup(struct kmod_ctx *ctx,
+						const char *alias,
+						struct kmod_list **list)
+{
+
+	int err;
+
+	if (ctx == NULL || alias == NULL)
+		return -ENOENT;
+
+
+	if (list == NULL || *list != NULL) {
+		ERR(ctx, "An empty list is needed to create lookup\n");
+		return -ENOSYS;
+	}
+
+	err = kmod_lookup_alias_from_config(ctx, alias, list);
+
+	if (err < 0) {
+		kmod_module_unref_list(*list);
+		*list = NULL;
+	}
+
+	return err;
+}
+
+KMOD_EXPORT int kmod_module_unref_list(struct kmod_list *list)
+{
+	for (; list != NULL; list = kmod_list_remove(list))
+		kmod_module_unref(list->data);
+
+	return 0;
+}
+
 KMOD_EXPORT struct kmod_module *kmod_module_get_module(struct kmod_list *l)
 {
 	struct kmod_module *mod = l->data;

libkmod/libkmod-private.h

@@ -55,6 +55,7 @@ struct kmod_list *kmod_list_remove_data(struct kmod_list *list,
 
 /* libkmod.c */
 const char *kmod_get_dirname(struct kmod_ctx *ctx) __attribute__((nonnull(1)));
+int kmod_lookup_alias_from_config(struct kmod_ctx *ctx, const char *name, struct kmod_list **list);
 
 /* libkmod-config.c */
 struct kmod_config {

libkmod/libkmod.c

@@ -23,6 +23,7 @@
 #include <stdarg.h>
 #include <unistd.h>
 #include <errno.h>
+#include <fnmatch.h>
 #include <string.h>
 #include <ctype.h>
 #include <sys/utsname.h>
@@ -258,3 +259,30 @@ KMOD_EXPORT void kmod_set_log_priority(struct kmod_ctx *ctx, int priority)
 {
 	ctx->log_priority = priority;
 }
+
+int kmod_lookup_alias_from_config(struct kmod_ctx *ctx, const char *name,
+						struct kmod_list **list)
+{
+	struct kmod_config *config = &ctx->config;
+	struct kmod_list *l;
+	int err;
+
+	kmod_list_foreach(l, config->aliases) {
+		const char *aliasname = kmod_alias_get_name(l);
+		const char *modname = kmod_alias_get_modname(l);
+
+		if (fnmatch(aliasname, name, 0) == 0) {
+			struct kmod_module *mod;
+
+			err = kmod_module_new_from_name(ctx, modname, &mod);
+			if (err < 0) {
+				ERR(ctx, "%s", strerror(-err));
+				return err;
+			}
+
+			*list = kmod_list_append(*list, mod);
+		}
+	}
+
+	return 0;
+}

libkmod/libkmod.h

@@ -100,9 +100,13 @@ int kmod_module_new_from_name(struct kmod_ctx *ctx, const char *name,
 						struct kmod_module **mod);
 int kmod_module_new_from_path(struct kmod_ctx *ctx, const char *path,
 						struct kmod_module **mod);
+int kmod_module_new_from_lookup(struct kmod_ctx *ctx, const char *alias,
+						struct kmod_list **list);
 
 struct kmod_module *kmod_module_ref(struct kmod_module *mod);
 struct kmod_module *kmod_module_unref(struct kmod_module *mod);
+int kmod_module_unref_list(struct kmod_list *list);
+struct kmod_module *kmod_module_get_module(struct kmod_list *l);
 
 int kmod_module_remove_module(struct kmod_module *mod, unsigned int flags);
 int kmod_module_insert_module(struct kmod_module *mod, unsigned int flags);

libkmod/libkmod.sym

@@ -19,11 +19,15 @@ global:
 
 	kmod_module_new_from_name;
 	kmod_module_new_from_path;
+	kmod_module_new_from_lookup;
 	kmod_module_ref;
 	kmod_module_unref;
+	kmod_module_unref_list;
 	kmod_module_remove_module;
 	kmod_module_insert_module;
 
+	kmod_module_get_module;
+
 	kmod_module_get_name;
 	kmod_module_get_path;
 local: