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Name is carl's questions

Martin Hope
Name is carl
Asked: 2015-04-13 08:05:55 +0800 CST
  • 2

I'm trying to execute a process as root from my application that runs with regular privileges using pkexec.

When I invoke pkexec synchronously everything is fine but when I run it asynchronously with the following code : 

    private void execute_process_async () {

        if (permission.allowed ) {
            ...

            Pid child_pid;
            var cli = "%s/my_exec".printf (Build.PKGDATADIR);
            try {

                Process.spawn_async (null,
                    {   "pkexec", cli,
                        settings.scrollbar_width.to_string (),
                        settings.scrollbar_button_radius.to_string (),
                        settings.active_tab_underline_color
                    },
                    Environ.get (),
                    SpawnFlags.SEARCH_PATH,
                    null,
                    out child_pid);
            } catch (SpawnError e) {
                report_error ("error while executing '%s'. Message: '%s'.".printf (cli, e.message)) ;
            }
        }
    }

I get an a rather grim error message: 

Refusing to render service to dead parents.

Do you know what is happening?

root
Martin Hope
Name is carl
Asked: 2015-03-12 19:26:57 +0800 CST
  • 5

I'm writing an application that needs to read and write an existing file in /usr/share...

If I understood well I need to use Polkit/PolicyKit to ask the system for a permission and ask the user to do the appropriate action (entering password).

If the user enters the proper password, the permission will be granted.

I'm using a GTK.LockButton while building a PolKit.Permission like this : 

    public static Polkit.Permission? create_permission () {
        string filename = "my.action" ;
        try {
            var permission = new Polkit.Permission.sync (filename, Polkit.UnixProcess.new (Posix.getpid ()));
            return permission;
        } catch (Error e) {
            critical ("Error while getting permission from '%s'. Error: %s", filename, e.message) ;
            return null ;
        }
    }

(I'm using vala)

And now I have to write a permission descriptor file. 

<!DOCTYPE policyconfig PUBLIC
 "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/PolicyKit/1.0/policyconfig.dtd">
<policyconfig>
  <vendor>my app</vendor>
  <vendor_url>https://myurl.com/</vendor_url>

  <action id="my.action">

  </action>

</policyconfig>

Could you help writing the rest of the permission descriptor file?

permissions
Martin Hope
Name is carl
Asked: 2015-03-11 10:42:29 +0800 CST
  • 5

I would like to be able to build multiple versions (i386 and amd64) of my package that has non trivial dependencies (gtk, etc).

My build script uses cmake.

At the moment, the command debuild -i -us -uc -b only builds amd64 on my ubuntu 64bits distribution and I havent installed any cross compiling toolchain.

How can I build binaries for both platforms?

packaging
Martin Hope
Name is carl
Asked: 2014-12-02 15:28:02 +0800 CST
  • 1

I added a bad ppa to my system and now I need to do manual package removing/downgrading.

The issue is that I enabled apt-get autoremove a while ago and removing a package to later replace it/downgrade threaten to uninstall perfectly working apps from my system.

I came across a solution to disable apt-get autoremove but for some reason I am not sure it applies to my configuration (trusty) as my /etc/apt/apt.conf.d/01autoremove looks very different from the sample: 

APT::Get::AutomaticRemove "0";
APT::Get::HideAutoRemove "1";

Here what my 01autoremove looks like: 

APT
{
  NeverAutoRemove
  {
    "^firmware-linux.*";
    "^linux-firmware$";
  };

  VersionedKernelPackages
  {
    # linux kernels
    "linux-image";
    "linux-headers";
<snip>

I really need to disable the autoremove feature so I can start to fix my package version with a clear mind and fearing that some other related package/app got deleted.

apt