10 June 2012

184. Fixing Gnome screenshot (3.4.1) in Debian Wheezy by patching and compiling

Putting a hold on gnome-screenshot forever will likely prevent gnome from upgrading properly since I'd suspect it's a required dependency.

Clarification: this fix restores the original behaviour. gnome-screenshot --interactive is NOT an acceptable solution. This guide restores gnome-screenshot to it's good old functional state.

So, time to build our own gnome-screenshot -- but one which actually works in a reasonable way. The gnome-screenshot cockup is just another sign that something is clearly amiss with the way gnome is being developed. And this, if true, is another truly idiotic 'feature' -- turn gnome into windows? Most of us left for a reason...

Anyway, linux is still sane though -- if we don't like something we're not entirely up a creek, which will buy us a bit more time while we're getting ready to move to xmonad  -- or for debian to move away from not making downstreams changes to gnome.

We have two options:
Either look here: http://git.gnome.org/browse/gnome-screenshot/commit/?id=3bbc1e158fd58ec7f4f984f6d3c15ec95e65a035&ignorews=1 and try to come up with your own way of reverting the crippling.

Or use the ubuntu patches as a guide: http://packages.ubuntu.com/precise/gnome-screenshot

Normally you shouldn't mix ubuntu and debian packages, and we won't: we'll be compiling our own package, but using the work done by the ubuntu maintainers.

In particular, look at this: http://archive.ubuntu.com/ubuntu/pool/main/g/gnome-screenshot/gnome-screenshot_3.4.1-0ubuntu1.debian.tar.gz

Look in the debian/patches directory and you'll find the ubuntu_interative_screenshots.patch

sudo apt-get install libgtk-3-dev libcanberra-gtk3-dev intltool
wget http://ftp.de.debian.org/debian/pool/main/g/gnome-screenshot/gnome-screenshot_3.4.1.orig.tar.xz
tar xvf gnome-screenshot_3.4.1.orig.tar.xz
cd gnome-screenshot-3.4.1/src

You can wget http://archive.ubuntu.com/ubuntu/pool/main/g/gnome-screenshot/gnome-screenshot_3.4.1-0ubuntu1.debian.tar.gz and untar it to look at the debian/patches/ubuntu_interactive_screenshots.patch, which what we do below is based on:

In the ubuntu patch there's a test to see whether unity is used. We'll do it a bit cruder -- we'll just make sure the condition is always true by testing for 0<1.

Edit src/screenshot-application.c and change the part in red

130 static void
131 save_pixbuf_handle_error (ScreenshotApplication *self,
132                           GError *error)
133 {
134   if (screenshot_config->interactive)
135     {
136       ScreenshotDialog *dialog = self->priv->dialog;
137       GtkWidget *toplevel = screenshot_dialog_get_toplevel (dialog);
139       screenshot_dialog_set_busy (dialog, FALSE);

134   if (0 < 1)

Also, change

348   screenshot_play_sound_effect ("screen-capture", _("Screenshot taken"));
350   if (screenshot_config->interactive)
351     {
352       self->priv->dialog = screenshot_dialog_new (self->priv->screenshot, self->priv->save_uri);
353       toplevel = screenshot_dialog_get_toplevel (self->priv->dialog);
354       gtk_widget_show (toplevel);

350   if (0 < 1 )

Time to build!
./configure --prefix=${HOME}/.gsc --program-suffix=.debugged
make install

Note: the install prefix here works fine for a single-user desktop. If you want everyone to be able to use our shiny new gnome-screenshot, put everything in /usr/bin instead.

We now have a working gnome screenshot in ~/.gsc that behaves as intended.
tree -L 2 -d
|-- bin
`-- share
    |-- applications
    |-- GConf
    |-- glib-2.0
    |-- gnome-screenshot
    |-- locale
    `-- man

 However, we need to make sure our fixed gnome-screenshot gets invoked.

In Gnome Shell 3.2.X
sudo apt-get install gconf-editor
Start gconf-editor
go to /apps/metacity/keybinding_commands/command_screenshot
change to e.g.  /home/verahill/.gsc/bin/gnome-screenshot.debugged
Also, change command_window_screenshot to
/home/verahill/.gsc/bin/gnome-screenshot.debugged --window

Note: defining Print/Alt+print keyboard shortcuts the 'gnome-shell' way (i.e. via system-settings) doesn't seem to work in gnome 3.2. Conversely, doing it the gconf-editor way in gnome 3.4 doesn't work.

In Gnome Shell 3.4.X
Go to System Settings, Keyboard, Shortcuts
Disable the automatically defined shortcuts for gnome-screenshot

And add your own under custom shortcuts:

Unless you want to add to PATH in which case you can put this in your ~/.bashrc:
export PATH=$PATH:${HOME}/.gsc/bin

Note: If it's still not working, try to launch from the terminal. If you get
(gnome-screenshot.debugged:7493): GLib-GIO-ERROR **: Settings schema 'org.gnome.gnome-screenshot' does not contain a key named 'auto-save-directory'
Trace/breakpoint trap
it's because you had the old, good gnome-screenshot. 
sudo su
echo "gnome-screenshot install"|dpkg --set-selections
sudo apt-get install gnome-screenshot

Now try
gsettings get org.gnome.gnome-screenshot auto-save-directory
which should be empty.

gsettings set org.gnome.gnome-screenshot auto-save-directory '/home/verahill/Pictures'

Finally, make sure to re-set your keybindings.

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