From mboxrd@z Thu Jan  1 00:00:00 1970
From: iyzsong@member.fsf.org (=?utf-8?B?5a6L5paH5q2m?=)
Subject: Re: gnome-tweak-tool tweaks
Date: Sat, 11 Jun 2016 11:49:07 +0800
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In-Reply-To: <87ziqt2pvo.fsf@gnu.org> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
	=?utf-8?Q?s?= message of "Fri, 10 Jun 2016 14:24:27 +0200")
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: guix-devel@gnu.org

ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> [...]
>
>> I/O error : Permission denied
>> I/O error : Permission denied
>> Failed to write XML file; For permission problems, try rerunning as root
>
> I found that string comes from =E2=80=98shared-mime-info=E2=80=99, which =
is itself used
> by the =E2=80=98xdg-mime-database=E2=80=99 hook in (guix profiles) (a hoo=
k that runs
> when the profile is created to update the MIME database):
>
> static gboolean save_xml_file(xmlDocPtr doc, const gchar *filename, GErro=
r **error)
> {
> #if LIBXML_VERSION > 20400
> 	if (xmlSaveFormatFileEnc(filename, doc, "utf-8", 1) < 0)
> 	{
> 		g_set_error(error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
> 			    "Failed to write XML file; For permission problems, try rerunning =
as root");
> 		return FALSE;
> 	}
> #else
>
> =E5=AE=8B=E6=96=87=E6=AD=A6: any idea what the problem might be?  Perhaps
> =E2=80=98update-mime-database=E2=80=99 is trying to write to /gnu/store/=
=E2=80=A6-something?
Yep, it happends when '$out/share/mime/application' is not writable.
The xml files under 'application' are going to be generated by
update-mime-database, and the shared-mime-info package has it
pre-generated, so after union "share/mime", an un-writable 'application'
directory point to the store will cause the problem.

Commit 359f06aa fix this by union the "share/mime/packages" directory.

>
> Also, it=E2=80=99s a problem that =E2=80=98update-mime-database=E2=80=99 =
returns 0 here, as
> seems to be the case.
It returns 256 here for the problem, but the derivation still built and
profile got updated, I have no idea about this :-

Does a failing hook (returns #f) supposed to top the profile update?