[Digikam-devel] download pictures from a cf-card silently overwrites pictures

[Klaus Weidenbach]

Hello,

Today I discovered a strange bug when downloading pictures within digiKam from 
a CF-card trough a USB card reader. The download media is a removable media 
in media:/sdb1. On this card there are 31 pictures. I download all and three 
pictures fail, so that there is a red cross and these three pictures also 
don't show up in digiKam. The folder in digiKam just shows 28 pictures. So I 
selected the three pictures with a red cross and downloaded them again. I got 
no warning or anything. One image that failed downloading is img_2933.jpg. 
When I go back to digiKam I got confused seeing img_2932 and img_2933 being 
the same pictures! On the card they are two completely different pictures. I 
checked digiKam's folder in konqueror and it is true both pictures are the 
same, so no caching problems, but they also have slightly different filesize. 
Well, it's getting even more strange. Image img_2932.jpg overwrote the image 
before, with the name img_2896.jpg and the real img_2896.jpg is gone! There 
was no warning about overwriting an image! If I download img_2896 and 
img_2932 once more from the card everything is allright, but there i am asked 
to overwrite the files.

Okay, I just made some more tests, that maybe clarify the real problem for the 
strange behavior explained above:
New test with same 31 pictures downloading from the card into a new folder.
3 pictures fail again, but different ones from the first time. The download 
tool shows the first red cross on the third picture img_2880.jpg. The first 
two pictures are called img_2862.jpg and img_2863.jpg. When I check in 
digiKam and in konqueror I see that the picture img_2880.jpg from the flash 
card is renamed to img_2863.jpg on the harddisk. The original img_2863.jpg 
from the card is not on the harddisk. There exists no file with the name 
img_2880.jpg on the harddisk, so therefore the download tool shows the red 
cross I guess. That's okay, but picture img_2880 IS existing as img_2863 and 
the real img_2863 is not there on the harddisk. So I can also download 
img_2880 again without a warning, because it does not exist with the name 
img_2880, but with the name img_2863. This explains why I had no overwrite 
warning on my first test.

If I drag&drop the pictures from konqueror from the card to digiKam there seem 
to be no problem with failed transfers. Just when I use the download tool in 
digiKam some pictures always fail. I had these failed transfers often since 
using newer digiKam versions, but never realized the problem that the 
pictures before the cross got lost and not the pictures with the red cross.

I am using Slackware current, KDE 3.5.8, SVN snapshot of digiKam from 2 weeks 
ago and just recompiling current snapshot to verify if it still exists there.

Hope you can understand my explanations.

Regards,
Klaus
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