[file-roller] correctly detect compressed tar archives

[Paolo Bacchilega <paobac src gnome org>]

commit 4f7986f97aa0de6af6d5b558bde60fd2fb913c25
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Aug 17 09:02:42 2016 +0200

    correctly detect compressed tar archives

 src/fr-archive.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/fr-archive.c b/src/fr-archive.c
index 2fb6162..374cc75 100644
--- a/src/fr-archive.c
+++ b/src/fr-archive.c
@@ -729,7 +729,14 @@ open_archive_buffer_ready_cb (GObject      *source_object,
        uri = g_file_get_uri (open_data->file);
        local_mime_type = g_content_type_guess (uri, (guchar *) open_data->buffer, open_data->buffer_size, 
&result_uncertain);
        if (! result_uncertain) {
-               mime_type = _g_str_get_static (local_mime_type);
+               const char const *mime_type_from_filename;
+
+               /* for example: "application/x-lrzip" --> "application/x-lrzip-compressed-tar" */
+               mime_type_from_filename = _g_mime_type_get_from_filename (open_data->file);
+               if ((mime_type_from_filename != NULL) && g_str_has_prefix (mime_type_from_filename, 
local_mime_type) && g_str_has_suffix (mime_type_from_filename, "-compressed-tar"))
+                       mime_type = _g_str_get_static (mime_type_from_filename);
+               else
+                       mime_type = _g_str_get_static (local_mime_type);
                archive = create_archive_to_load_archive (open_data->file, mime_type);
        }
        if (archive == NULL) {