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Bug 632169 - manual use of gsettings-data-convert

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Add some words and example code to the documentation about why you might
want to manually invoke gsettings-data-convert and how you should go
about doing that.
This commit is contained in:
Ryan Lortie 2010-10-27 09:08:32 -04:00
parent 9126f1afae
commit dfb0577ef4
1 changed files with 64 additions and 0 deletions
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64
docs/reference/gio/migrating-gconf.xml
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@ -449,5 +449,69 @@ some-odd-key1 = /apps/myapp/some_ODD-key1
script if you are making use of the GConf backend or the conversion
utility.
</para>
<para>
If, as an application developer, you are interested in manually
ensuring that <command>gsettings-data-convert</command> has been
invoked (for example, to deal with the case where the user is
logged in during a distribution upgrade or for non-XDG desktop
environments which do not run the command as an autostart) you
may invoke it manually during your program initialisation. This
is not recommended for all application authors -- it is your
choice if this use case concerns you enough.
</para>
<para>
Internally, <command>gsettings-data-convert</command> uses a
keyfile to track which settings have been migrated. The
following code fragment will check that keyfile to see if your
data conversion script has been run yet and, if not, will
attempt to invoke the tool to run it. You should adapt it to
your application as you see fit.
</para>
<para>
<programlisting>
<![CDATA[
static void
ensure_migrated (const gchar *name)
{
gboolean needed = TRUE;
GKeyFile *kf;
gchar **list;
gsize i, n;
kf = g_key_file_new ();
g_key_file_load_from_data_dirs (kf, "gsettings-data-convert",
NULL, G_KEY_FILE_NONE, NULL);
list = g_key_file_get_string_list (kf, "State", "converted", &n, NULL);
if (list)
{
for (i = 0; i < n; i++)
if (strcmp (list[i], name) == 0)
{
needed = FALSE;
break;
}
g_strfreev (list);
}
g_key_file_free (kf);
if (needed)
g_spawn_command_line_sync ("gsettings-data-convert",
NULL, NULL, NULL, NULL);
}
]]>
</programlisting>
</para>
<para>
Although there is the possibility that the
<command>gsettings-data-convert</command> script will end up
running multiple times concurrently with this approach, it is
believed that this is safe.
</para>
</section>
</chapter>