1 files changed, 383 insertions, 0 deletions
diff --git a/src/inotify_update.c b/src/inotify_update.c
new file mode 100644
index 000000000..8d9657961
--- /dev/null
+++ b/src/inotify_update.c
@@ -0,0 +1,383 @@
+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 "config.h" /* must be first for large file support */
+#include "inotify_update.h"
+#include "inotify_source.h"
+#include "inotify_queue.h"
+#include "database.h"
+#include "mapper.h"
+#include "path.h"
+
+#include <assert.h>
+#include <sys/inotify.h>
+#include <sys/stat.h>
+#include <stdbool.h>
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "inotify"
+
+enum {
+	IN_MASK = IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_DELETE_SELF
+	|IN_MOVE|IN_MOVE_SELF
+#ifdef IN_ONLYDIR
+	|IN_ONLYDIR
+#endif
+};
+
+struct watch_directory {
+	struct watch_directory *parent;
+
+	char *name;
+
+	int descriptor;
+
+	GList *children;
+};
+
+static struct mpd_inotify_source *inotify_source;
+
+static unsigned inotify_max_depth;
+static struct watch_directory inotify_root;
+static GTree *inotify_directories;
+
+static gint
+compare(gconstpointer a, gconstpointer b)
+{
+	if (a < b)
+		return -1;
+	else if (a > b)
+		return 1;
+	else
+		return 0;
+}
+
+static void
+tree_add_watch_directory(struct watch_directory *directory)
+{
+	g_tree_insert(inotify_directories,
+		      GINT_TO_POINTER(directory->descriptor), directory);
+}
+
+static void
+tree_remove_watch_directory(struct watch_directory *directory)
+{
+	G_GNUC_UNUSED
+	bool found = g_tree_remove(inotify_directories,
+				   GINT_TO_POINTER(directory->descriptor));
+	assert(found);
+}
+
+static struct watch_directory *
+tree_find_watch_directory(int wd)
+{
+	return g_tree_lookup(inotify_directories, GINT_TO_POINTER(wd));
+}
+
+static void
+remove_watch_directory(struct watch_directory *directory)
+{
+	assert(directory != NULL);
+
+	if (directory->parent == NULL) {
+		g_warning("music directory was removed - "
+			  "cannot continue to watch it");
+		return;
+	}
+
+	assert(directory->parent->children != NULL);
+
+	tree_remove_watch_directory(directory);
+
+	while (directory->children != NULL)
+		remove_watch_directory(directory->children->data);
+
+	directory->parent->children =
+		g_list_remove(directory->parent->children, directory);
+
+	mpd_inotify_source_rm(inotify_source, directory->descriptor);
+	g_free(directory->name);
+	g_slice_free(struct watch_directory, directory);
+}
+
+static char *
+watch_directory_get_uri_fs(const struct watch_directory *directory)
+{
+	char *parent_uri, *uri;
+
+	if (directory->parent == NULL)
+		return NULL;
+
+	parent_uri = watch_directory_get_uri_fs(directory->parent);
+	if (parent_uri == NULL)
+		return g_strdup(directory->name);
+
+	uri = g_strconcat(parent_uri, "/", directory->name, NULL);
+	g_free(parent_uri);
+
+	return uri;
+}
+
+/* we don't look at "." / ".." nor files with newlines in their name */
+static bool skip_path(const char *path)
+{
+	return (path[0] == '.' && path[1] == 0) ||
+		(path[0] == '.' && path[1] == '.' && path[2] == 0) ||
+		strchr(path, '\n') != NULL;
+}
+
+static void
+recursive_watch_subdirectories(struct watch_directory *directory,
+			       const char *path_fs, unsigned depth)
+{
+	GError *error = NULL;
+	DIR *dir;
+	struct dirent *ent;
+
+	assert(directory != NULL);
+	assert(depth <= inotify_max_depth);
+	assert(path_fs != NULL);
+
+	++depth;
+
+	if (depth > inotify_max_depth)
+		return;
+
+	dir = opendir(path_fs);
+	if (dir == NULL) {
+		g_warning("Failed to open directory %s: %s",
+			  path_fs, g_strerror(errno));
+		return;
+	}
+
+	while ((ent = readdir(dir))) {
+		char *child_path_fs;
+		struct stat st;
+		int ret;
+		struct watch_directory *child;
+
+		if (skip_path(ent->d_name))
+			continue;
+
+		child_path_fs = g_strconcat(path_fs, "/", ent->d_name, NULL);
+		ret = stat(child_path_fs, &st);
+		if (ret < 0) {
+			g_warning("Failed to stat %s: %s",
+				  child_path_fs, g_strerror(errno));
+			g_free(child_path_fs);
+			continue;
+		}
+
+		if (!S_ISDIR(st.st_mode)) {
+			g_free(child_path_fs);
+			continue;
+		}
+
+		ret = mpd_inotify_source_add(inotify_source, child_path_fs,
+					     IN_MASK, &error);
+		if (ret < 0) {
+			g_warning("Failed to register %s: %s",
+				  child_path_fs, error->message);
+			g_error_free(error);
+			error = NULL;
+			g_free(child_path_fs);
+			continue;
+		}
+
+		child = tree_find_watch_directory(ret);
+		if (child != NULL) {
+			/* already being watched */
+			g_free(child_path_fs);
+			continue;
+		}
+
+		child = g_slice_new(struct watch_directory);
+		child->parent = directory;
+		child->name = g_strdup(ent->d_name);
+		child->descriptor = ret;
+		child->children = NULL;
+
+		directory->children = g_list_prepend(directory->children,
+						     child);
+
+		tree_add_watch_directory(child);
+
+		recursive_watch_subdirectories(child, child_path_fs, depth);
+		g_free(child_path_fs);
+	}
+
+	closedir(dir);
+}
+
+G_GNUC_PURE
+static unsigned
+watch_directory_depth(const struct watch_directory *d)
+{
+	assert(d != NULL);
+
+	unsigned depth = 0;
+	while ((d = d->parent) != NULL)
+		++depth;
+
+	return depth;
+}
+
+static void
+mpd_inotify_callback(int wd, unsigned mask,
+		     G_GNUC_UNUSED const char *name, G_GNUC_UNUSED void *ctx)
+{
+	struct watch_directory *directory;
+	char *uri_fs;
+
+	/*g_debug("wd=%d mask=0x%x name='%s'", wd, mask, name);*/
+
+	directory = tree_find_watch_directory(wd);
+	if (directory == NULL)
+		return;
+
+	uri_fs = watch_directory_get_uri_fs(directory);
+
+	if ((mask & (IN_DELETE_SELF|IN_MOVE_SELF)) != 0) {
+		g_free(uri_fs);
+		remove_watch_directory(directory);
+		return;
+	}
+
+	if ((mask & (IN_ATTRIB|IN_CREATE|IN_MOVE)) != 0 &&
+	    (mask & IN_ISDIR) != 0) {
+		/* a sub directory was changed: register those in
+		   inotify */
+		char *root = map_directory_fs(db_get_root());
+		char *path_fs;
+
+		if (uri_fs != NULL) {
+			path_fs = g_strconcat(root, "/", uri_fs, NULL);
+			g_free(root);
+		} else
+			path_fs = root;
+
+		recursive_watch_subdirectories(directory, path_fs,
+					       watch_directory_depth(directory));
+		g_free(path_fs);
+	}
+
+	if ((mask & (IN_CLOSE_WRITE|IN_MOVE|IN_DELETE)) != 0 ||
+	    /* at the maximum depth, we watch out for newly created
+	       directories */
+	    (watch_directory_depth(directory) == inotify_max_depth &&
+	     (mask & (IN_CREATE|IN_ISDIR)) == (IN_CREATE|IN_ISDIR))) {
+		/* a file was changed, or a directory was
+		   moved/deleted: queue a database update */
+		char *uri_utf8 = uri_fs != NULL
+			? fs_charset_to_utf8(uri_fs)
+			: g_strdup("");
+
+		if (uri_utf8 != NULL)
+			/* this function will take care of freeing
+			   uri_utf8 */
+			mpd_inotify_enqueue(uri_utf8);
+	}
+
+	g_free(uri_fs);
+}
+
+void
+mpd_inotify_init(unsigned max_depth)
+{
+	struct directory *root;
+	char *path;
+	GError *error = NULL;
+
+	g_debug("initializing inotify");
+
+	root = db_get_root();
+	if (root == NULL) {
+		g_debug("no music directory configured");
+		return;
+	}
+
+	path = map_directory_fs(root);
+	if (path == NULL) {
+		g_warning("mapper has failed");
+		return;
+	}
+
+	inotify_source = mpd_inotify_source_new(mpd_inotify_callback, NULL,
+						&error);
+	if (inotify_source == NULL) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		g_free(path);
+		return;
+	}
+
+	inotify_max_depth = max_depth;
+
+	inotify_root.name = path;
+	inotify_root.descriptor = mpd_inotify_source_add(inotify_source, path,
+							 IN_MASK, &error);
+	if (inotify_root.descriptor < 0) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		mpd_inotify_source_free(inotify_source);
+		inotify_source = NULL;
+		g_free(path);
+		return;
+	}
+
+	inotify_directories = g_tree_new(compare);
+	tree_add_watch_directory(&inotify_root);
+
+	recursive_watch_subdirectories(&inotify_root, path, 0);
+
+	mpd_inotify_queue_init();
+
+	g_debug("watching music directory");
+}
+
+static gboolean
+free_watch_directory(G_GNUC_UNUSED gpointer key, gpointer value,
+		     G_GNUC_UNUSED gpointer data)
+{
+	struct watch_directory *directory = value;
+
+	g_free(directory->name);
+	g_list_free(directory->children);
+
+	if (directory != &inotify_root)
+		g_slice_free(struct watch_directory, directory);
+
+	return false;
+}
+
+void
+mpd_inotify_finish(void)
+{
+	if (inotify_source == NULL)
+		return;
+
+	mpd_inotify_queue_finish();
+	mpd_inotify_source_free(inotify_source);
+
+	g_tree_foreach(inotify_directories, free_watch_directory, NULL);
+	g_tree_destroy(inotify_directories);
+}