Add another flag to autohide the manager when there are no devices
[pmount-gui.git] / main.c
diff --git a/main.c b/main.c
index e5b644024648727747d9fdd564ff1d5770448df1..81bc4bffd77899c9b3a80e6ee34f8e98c426c393 100644 (file)
--- a/main.c
+++ b/main.c
@@ -7,9 +7,11 @@
 #include <fcntl.h>
 #include <dirent.h>
 #include <mntent.h>
+#include <errno.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/select.h>
+#include <sys/inotify.h>
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
@@ -29,8 +31,22 @@ typedef struct sDevice
        time_t time;
 } Device;
 
+typedef struct sGuiContext
+{
+       int manager;
+       int autohide;
+       Device *devices;
+       GtkWidget *window;
+       GtkWidget *list;
+       GtkWidget *button;
+       char *post_mount_command;
+       int inotify_fd;
+       int dev_wd;
+       GIOChannel *inotify_channel;
+       int refresh_pending;
+} GuiContext;
+
 int verbosity = 0;
-char *post_mount_command = NULL;
 
 /**
 Parses a string of the form name=value and places the components in a Property
@@ -635,19 +651,38 @@ int toggle_device(Device *device, char *out_buf, int out_size)
 {
        int umount = !!device->mount_point;
        char mount_point[1024];
-       int len;
        int pos = 0;
        int status = 0;
        fd_set fds;
        struct timeval timeout;
        int pid;
        int pipe_fd[2];
+       char suffix = 0;
 
        out_buf[0] = 0;
 
-       len = snprintf(mount_point, sizeof(mount_point), "/media/%s", device->label);
-       if(len>=(int)sizeof(mount_point))
-               return -1;
+       /* Find a mount point that does not exist yet. */
+       while(1)
+       {
+               int len;
+
+               len = snprintf(mount_point, sizeof(mount_point), "/media/%s", device->label);
+               if(len+2>=(int)sizeof(mount_point))
+                       return -1;
+
+               if(suffix)
+                       len += snprintf(mount_point+len, sizeof(mount_point)-len, "_%c", suffix);
+
+               if(access(mount_point, F_OK)<0 && errno==ENOENT)
+                       break;
+
+               if(suffix==0)
+                       suffix = '1';
+               else if(suffix<'9')
+                       ++suffix;
+               else
+                       return -1;
+       }
 
        pipe(pipe_fd);
 
@@ -739,12 +774,107 @@ int toggle_device(Device *device, char *out_buf, int out_size)
        return 0;
 }
 
+/**
+Refreshes both the internal devices array and the GUI list.
+*/
+int refresh_devices(GuiContext *context, int umount)
+{
+       GtkListStore *store;
+       GtkTreeSelection *selection;
+       int n_listed;
+       time_t latest;
+       int i;
+       GtkTreeIter iter;
+
+       store = GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(context->list)));
+       gtk_list_store_clear(store);
+
+       free_devices(context->devices);
+
+       context->devices = get_devices();
+       if(!context->devices)
+               return 0;
+
+       selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(context->list));
+
+       /* Populate the list with devices in appropriate state. */
+       n_listed = 0;
+       latest = 0;
+       for(i=0; context->devices[i].node; ++i)
+       {
+               Device *dev;
+
+               dev = &context->devices[i];
+               if(umount<0 || !dev->mount_point==!umount)
+               {
+                       gtk_list_store_append(store, &iter);
+                       gtk_list_store_set(store, &iter,
+                               0, dev->description,
+                               1, dev,
+                               2, !!dev->mount_point,
+                               3, dev->mount_point,
+                               -1);
+                       if(dev->time>latest)
+                       {
+                               /* Pre-select the device that appeared on the system most recently. */
+                               latest = dev->time;
+                               gtk_tree_selection_select_iter(selection, &iter);
+                       }
+
+                       ++n_listed;
+               }
+       }
+
+       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;
+       int n_listed;
+
+       n_listed = refresh_devices(context, -1);
+       context->refresh_pending = 0;
+
+       if(context->autohide)
+       {
+               if(n_listed)
+                       gtk_widget_show_all(context->window);
+               else
+                       gtk_widget_hide(context->window);
+       }
+
+       return FALSE;
+}
+
+/**
+Callback for selection in the device list changing.  Updates the action button
+label according to device status.
+*/
+void selection_changed(GtkTreeSelection *selection, gpointer user_data)
+{
+       GuiContext *context = (GuiContext *)user_data;
+       GtkTreeIter iter;
+       GtkTreeModel *model;
+       Device *device;
+
+       if(!gtk_tree_selection_get_selected(selection, &model, &iter))
+               return;
+
+       gtk_tree_model_get(model, &iter, 1, &device, -1);
+       gtk_button_set_label(GTK_BUTTON(context->button), (device->mount_point ? "Unmount" : "Mount"));
+}
+
 /**
 Callback for activating a row in the device list.  Mounts or unmounts the
 device depending on operating mode.
 */
 void row_activated(GtkTreeView *list, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
 {
+       GuiContext *context = (GuiContext *)user_data;
        GtkTreeModel *model;
        GtkTreeIter iter;
        Device *device;
@@ -766,23 +896,36 @@ void row_activated(GtkTreeView *list, GtkTreePath *path, GtkTreeViewColumn *colu
                /* Pmount terminated with nonzero status or a signal.  Display an
                error to the user. */
                dialog = gtk_message_dialog_new(NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_OK, "%s", output);
-               g_signal_connect(dialog, "response", &gtk_main_quit, NULL);
+               if(context->manager)
+                       g_signal_connect(dialog, "response", G_CALLBACK(&gtk_widget_destroy), dialog);
+               else
+                       g_signal_connect(dialog, "response", G_CALLBACK(&gtk_main_quit), NULL);
                gtk_widget_show_all(dialog);
                return;
        }
 
-       gtk_main_quit();
+       if(context->manager)
+       {
+               gtk_list_store_set(GTK_LIST_STORE(model), &iter,
+                       2, !!device->mount_point,
+                       3, device->mount_point,
+                       -1);
+
+               gtk_button_set_label(GTK_BUTTON(context->button), (device->mount_point ? "Unmount" : "Mount"));
+       }
+       else
+               gtk_main_quit();
 
-       if(post_mount_command && device->mount_point)
+       if(context->post_mount_command && device->mount_point)
        {
                if(verbosity>=1)
-                       printf("Running %s in %s\n", post_mount_command, device->mount_point);
+                       printf("Running %s in %s\n", context->post_mount_command, device->mount_point);
 
                pid = fork();
                if(pid==0)
                {
                        chdir(device->mount_point);
-                       execlp(post_mount_command, post_mount_command, NULL);
+                       execlp(context->post_mount_command, context->post_mount_command, NULL);
                        _exit(1);
                }
        }
@@ -797,16 +940,18 @@ list to be activated.
 */
 void button_clicked(GtkButton *button, gpointer user_data)
 {
-       GtkWidget *list = (GtkWidget *)user_data;
+       GuiContext *context = (GuiContext *)user_data;
        GtkTreeSelection *selection;
        GtkTreeIter iter;
        GtkTreeModel *model;
        GtkTreePath *path;
+       GtkTreeViewColumn *column;
 
-       selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(list));
+       selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(context->list));
        gtk_tree_selection_get_selected(selection, &model, &iter);
        path = gtk_tree_model_get_path(model, &iter);
-       gtk_tree_view_row_activated(GTK_TREE_VIEW(list), path, gtk_tree_view_get_column(GTK_TREE_VIEW(list), 0));
+       column = gtk_tree_view_get_column(GTK_TREE_VIEW(context->list), 0);
+       gtk_tree_view_row_activated(GTK_TREE_VIEW(context->list), path, column);
        gtk_tree_path_free(path);
 
        (void)button;
@@ -829,6 +974,32 @@ 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"
@@ -838,29 +1009,35 @@ void show_help(void)
                "  -v  Increase verbosity\n"
                "  -u  Unmount a device (default is mount)\n"
                "  -r  Run a command after mounting\n"
+               "  -m  Start a persistent mount manager\n"
+               "  -M  Like -m, but hide the window if there are no devices\n"
                "  -h  Display this help\n");
 }
 
 int main(int argc, char **argv)
 {
-       GtkWidget *window;
+       GuiContext context;
        GtkWidget *box;
        GtkWidget *viewport;
-       GtkWidget *list;
        GtkListStore *store;
        GtkTreeSelection *selection;
-       GtkWidget *button;
-       GtkTreeIter iter;
-       Device *devices;
-       int i;
-       time_t latest;
+       GtkCellRenderer *mounted_toggle;
        int opt;
        int umount = 0;
        int n_listed;
 
+       context.manager = 0;
+       context.autohide = 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);
 
-       while((opt = getopt(argc, argv, "vur:h"))!=-1) switch(opt)
+       while((opt = getopt(argc, argv, "vur:mMh"))!=-1) switch(opt)
        {
        case 'v':
                ++verbosity;
@@ -869,66 +1046,86 @@ int main(int argc, char **argv)
                umount = 1;
                break;
        case 'r':
-               post_mount_command = optarg;
+               context.post_mount_command = optarg;
+               break;
+       case 'm':
+               context.manager = 1;
+               context.autohide = 0;
+               break;
+       case 'M':
+               context.manager = 1;
+               context.autohide = 1;
                break;
        case 'h':
                show_help();
                return 0;
        }
 
-       window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
-       gtk_container_set_border_width(GTK_CONTAINER(window), 5);
-       g_signal_connect(window, "destroy", G_CALLBACK(&gtk_main_quit), NULL);
-       g_signal_connect(window, "key-press-event", G_CALLBACK(&key_press), NULL);
+       context.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+       gtk_container_set_border_width(GTK_CONTAINER(context.window), 5);
+       g_signal_connect(context.window, "destroy", G_CALLBACK(&gtk_main_quit), NULL);
+       g_signal_connect(context.window, "key-press-event", G_CALLBACK(&key_press), NULL);
 
        box = gtk_vbox_new(FALSE, 5);
-       gtk_container_add(GTK_CONTAINER(window), box);
+       gtk_container_add(GTK_CONTAINER(context.window), box);
 
        viewport = gtk_viewport_new(NULL, NULL);
        gtk_viewport_set_shadow_type(GTK_VIEWPORT(viewport), GTK_SHADOW_IN);
        gtk_box_pack_start(GTK_BOX(box), viewport, TRUE, TRUE, 0);
 
-       list = gtk_tree_view_new();
-       gtk_container_add(GTK_CONTAINER(viewport), list);
-       g_signal_connect(list, "row-activated", G_CALLBACK(&row_activated), NULL);
+       context.list = gtk_tree_view_new();
+       gtk_container_add(GTK_CONTAINER(viewport), context.list);
+       g_signal_connect(context.list, "row-activated", G_CALLBACK(&row_activated), &context);
 
-       store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_POINTER);
-       gtk_tree_view_set_model(GTK_TREE_VIEW(list), GTK_TREE_MODEL(store));
-       gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(list),
+       store = gtk_list_store_new(4, G_TYPE_STRING, G_TYPE_POINTER, G_TYPE_BOOLEAN, G_TYPE_STRING);
+       gtk_tree_view_set_model(GTK_TREE_VIEW(context.list), GTK_TREE_MODEL(store));
+       gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(context.list),
                -1, "Device", gtk_cell_renderer_text_new(), "text", 0, NULL);
 
-       selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(list));
+       if(context.manager)
+       {
+               GtkTreeViewColumn *mounted_column;
+               GtkCellRenderer *mount_point_renderer;
 
-       button = gtk_button_new_with_label(umount ? "Unmount" : "Mount");
-       g_signal_connect(button, "clicked", G_CALLBACK(&button_clicked), list);
-       gtk_box_pack_start(GTK_BOX(box), button, FALSE, TRUE, 0);
+               mounted_column = gtk_tree_view_column_new();
+               gtk_tree_view_column_set_title(mounted_column, "Mounted");
 
-       devices = get_devices();
-       n_listed = 0;
-       if(devices)
-       {
-               /* Populate the list with devices in appropriate state. */
-               latest = 0;
-               for(i=0; devices[i].node; ++i)
-                       if(!devices[i].mount_point==!umount)
-                       {
-                               gtk_list_store_append(store, &iter);
-                               gtk_list_store_set(store, &iter, 0, devices[i].description, 1, &devices[i], -1);
-                               if(devices[i].time>latest)
-                               {
-                                       /* Pre-select the device that appeared on the system most recently. */
-                                       latest = devices[i].time;
-                                       gtk_tree_selection_select_iter(selection, &iter);
-                               }
+               mounted_toggle = gtk_cell_renderer_toggle_new();
+               gtk_tree_view_column_pack_start(mounted_column, mounted_toggle, FALSE);
+               gtk_tree_view_column_add_attribute(mounted_column, mounted_toggle, "active", 2);
 
-                               ++n_listed;
-                       }
+               mount_point_renderer = gtk_cell_renderer_text_new();
+               gtk_tree_view_column_pack_start(mounted_column, mount_point_renderer, TRUE);
+               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;
        }
 
-       if(n_listed)
-               gtk_widget_show_all(window);
-       else
+       selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(context.list));
+       g_signal_connect(selection, "changed", G_CALLBACK(&selection_changed), &context);
+
+       context.button = gtk_button_new_with_label(umount ? "Unmount" : "Mount");
+       g_signal_connect(context.button, "clicked", G_CALLBACK(&button_clicked), &context);
+       gtk_box_pack_start(GTK_BOX(box), context.button, FALSE, TRUE, 0);
+
+       n_listed = refresh_devices(&context, umount);
+
+       if(n_listed || (context.manager && !context.autohide))
+               gtk_widget_show_all(context.window);
+       else if(!context.manager)
        {
                GtkWidget *dialog;
 
@@ -941,7 +1138,9 @@ int main(int argc, char **argv)
 
        gtk_main();
 
-       free_devices(devices);
+       free_devices(context.devices);
+       if(context.inotify_fd>=0)
+               close(context.inotify_fd);
 
        return 0;
 }