From dff5596f969ef4c46dc943c094642934c54bb179 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 25 Feb 2016 20:43:38 +0200
Subject: [PATCH] Automatically refresh the device list in manager mode

---
 main.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/main.c b/main.c
index 59bf305..5413548 100644
--- a/main.c
+++ b/main.c
@@ -11,6 +11,7 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/select.h>
+#include <sys/inotify.h>
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
@@ -37,6 +38,10 @@ typedef struct sGuiContext
 	GtkWidget *list;
 	GtkWidget *button;
 	char *post_mount_command;
+	int inotify_fd;
+	int dev_wd;
+	GIOChannel *inotify_channel;
+	int refresh_pending;
 } GuiContext;
 
 int verbosity = 0;
@@ -821,6 +826,19 @@ int refresh_devices(GuiContext *context, int umount)
 	return n_listed;
 }
 
+/**
+Handles an automatic refresh of the device list in response to inotify events.
+*/
+gboolean refresh_devices_idle(gpointer data)
+{
+	GuiContext *context = (GuiContext *)data;
+
+	refresh_devices(context, -1);
+	context->refresh_pending = 0;
+
+	return FALSE;
+}
+
 /**
 Callback for selection in the device list changing.  Updates the action button
 label according to device status.
@@ -945,6 +963,32 @@ gboolean key_press(GtkWidget *widget, GdkEvent *event, gpointer user_data)
 	return FALSE;
 }
 
+/**
+Callback for inotify events.
+*/
+gboolean inotify_event_available(GIOChannel *source, GIOCondition condition, gpointer user_data)
+{
+	GuiContext *context = (GuiContext *)user_data;
+	int fd;
+	char eventbuf[sizeof(struct inotify_event)+NAME_MAX+1];
+	int len;
+
+	fd = g_io_channel_unix_get_fd(source);
+	len = read(fd, eventbuf, sizeof(eventbuf));
+	if(len>=(int)sizeof(struct inotify_event))
+	{
+		if(!context->refresh_pending)
+		{
+			g_timeout_add(500, &refresh_devices_idle, context);
+			context->refresh_pending = 1;
+		}
+	}
+
+	(void)condition;
+
+	return TRUE;
+}
+
 void show_help(void)
 {
 	printf("pmount-gui\n"
@@ -974,6 +1018,10 @@ int main(int argc, char **argv)
 	context.manager = 0;
 	context.devices = NULL;
 	context.post_mount_command = NULL;
+	context.inotify_fd = -1;
+	context.dev_wd = -1;
+	context.inotify_channel = NULL;
+	context.refresh_pending = 0;
 
 	gtk_init(&argc, &argv);
 
@@ -1034,6 +1082,19 @@ int main(int argc, char **argv)
 		gtk_tree_view_column_add_attribute(mounted_column, mount_point_renderer, "text", 3);
 
 		gtk_tree_view_insert_column(GTK_TREE_VIEW(context.list), mounted_column, -1);
+
+		context.inotify_fd = inotify_init();
+		if(context.inotify_fd>=0)
+		{
+			context.dev_wd = inotify_add_watch(context.inotify_fd, "/dev/disk/by-id", IN_CREATE|IN_DELETE);
+
+			context.inotify_channel = g_io_channel_unix_new(context.inotify_fd);
+			g_io_add_watch(context.inotify_channel, G_IO_IN, &inotify_event_available, &context);
+		}
+		else
+			printf("Warning: Unable to initialize inotify\n");
+
+		umount = -1;
 	}
 
 	selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(context.list));
@@ -1061,6 +1122,8 @@ int main(int argc, char **argv)
 	gtk_main();
 
 	free_devices(context.devices);
+	if(context.inotify_fd>=0)
+		close(context.inotify_fd);
 
 	return 0;
 }
-- 
2.43.0