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-rw-r--r--thumbnail/thumbnail-spec.sgml8
1 files changed, 7 insertions, 1 deletions
diff --git a/thumbnail/thumbnail-spec.sgml b/thumbnail/thumbnail-spec.sgml
index cc6c70c..d142e95 100644
--- a/thumbnail/thumbnail-spec.sgml
+++ b/thumbnail/thumbnail-spec.sgml
@@ -467,6 +467,12 @@ $XDG_CACHE_HOME/thumbnails/fail/
way we assure that if a user creates a thumbnail for a file where only he
has read-permissions no other user can take a glance on it through the
backdoor with the thumbnails.</para>
+
+ <para>Programs should first check that the original image file is readable.
+ If it is not, the program should not attempt to read a thumbnail from the
+ cache, and it should not save any information in the cache (including
+ "failed" thumbnails). Otherwise, thumbnailing will be prevented even if the
+ permissions are changed to permit reading.</para>
</sect2>
<sect2><title>Concurrent Thumbnail Creation</title> <para>An important goal
@@ -608,7 +614,7 @@ if (file.mtime != thumb.MTime) {
with the name of the program appended by the version number
(eg. <prompt>$XDG_CACHE_HOME/thumbnails/fail/nautilus-1.0</prompt>).</para>
- <para> For every thumbnail generation failure the program creates an empty
+ <para> For every thumbnail generation failure of a readable image, the program creates an empty
PNG file. If it's possible to obtain some additional information from
the image (see <link linkend="addinfos">Store Additional
Information</link>) they should be stored together with the thumbnail