[Bug 451960] [NEW] link: Operation not permitted

[Wolfgang Kufner]

Public bug reported:

Binary package hint: zsync

zsync is a great tool. I am currently using it almost daily to get the iso updated to put on a stick from where I loopmount it with grub2.
I just tried to zsync directly onto a sticks FAT filesystem (can casper do only FAT?):

--------console copy "FAT"----------
wolfgang at karmic:/media/VERBAFAT/iso$ zsync http://cdimage.ubuntu.com/daily-live/current/karmic-desktop-amd64.iso.zsync
#################### 100.0% 283.9 kBps DONE     

reading seed file karmic-desktop-amd64.iso: ****************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read karmic-desktop-amd64.iso. Target 100.0% complete.      
verifying download...checksum matches OK
link: Operation not permitted
Unable to back up old file karmic-desktop-amd64.iso - completed download left in karmic-desktop-amd64.iso.part
used 728621056 local, fetched 0
--------end console copy "FAT"----------

I sat a while befor the stars started. That does not occur on harddisk.
Here the same thing minutes later in a hd directory:

--------console copy "hd"----------
wolfgang at karmic:~/tmp$ zsync http://cdimage.ubuntu.com/daily-live/current/karmic-desktop-amd64.iso.zsync
#################### 100.0% 369.5 kBps DONE     

reading seed file karmic-desktop-amd64.iso: ****************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read karmic-desktop-amd64.iso. Target 88.5% complete.      
downloading from http://cdimage.ubuntu.com/daily-live/current/karmic-desktop-amd64.iso:
##################-- 93.0% 377.2 kBps           

downloading from http://cdimage.ubuntu.com/daily-live/current/karmic-desktop-amd64.iso:
###################- 96.3% 365.6 kBps           

downloading from http://cdimage.ubuntu.com/daily-live/current/karmic-desktop-amd64.iso:
#################### 100.0% 376.6 kBps DONE      

verifying download...checksum matches OK
used 645783552 local, fetched 84755397
--------end console copy "hd"----------

Does zsync use links that are not available on FAT, making zsync on FAT impossible?
Should zsync be fixed/changed to do FAT also?
Otherwise this limitation/requirement should be stated on the man page of zsync, I think.
Or am I overlooking something?

** Affects: zsync (Ubuntu)
     Importance: Undecided
         Status: New

-- 
link: Operation not permitted
https://bugs.launchpad.net/bugs/451960
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