[Bug 477551] [NEW] rcksum-xxxxxx temporay files left on disk by zsync

[psl]

Public bug reported:

Binary package hint: zsync

zsync 0.6, Ubuntu 9.10 i386

# zsync -V
zsync v0.6 (compiled Nov  6 2009 05:52:12)
By Colin Phipps <cph at moria.org.uk>
Published under the Artistic License v2, see the COPYING file for details.

DESCRIPTION:
zsync creates temporary files rcksum-xxxxxx during read of seed files to the current directory. When zsync is interrupted during this stage (like CTRL-C), temporary file is left on the disk. I think, this file is useless and zsync doesn't use it on next run; it creates new temporary file.

EXAMPLE:

I start with empty directory and start zsync.

$ zsync http://server/zsync/ubuntu-9.10-server-i386.iso.zsync
#################### 100.0% 0.0 kBps DONE    

No relevent local data found - I will be downloading the whole file. If that's not what you want, CTRL-C out. You should specify the local file is the old version of the file to download with -i (you might have to decompress it with gzip -d first). Or perhaps you just have no data that helps download the file
downloading from http://nas/zsync/ubuntu-9.10-server-i386.iso:
#####--------------- 25.6% 11713.8 kBps 0:42 ETA  ^C

$ ls -ltr
total 176620
-rw------- 1 root root 180674560 2009-11-07 17:01 ubuntu-9.10-server-i386.iso.part

rcksum file was not created, no seed file was available. Restart the
process and press CTRL-C:

$ zsync http://server/zsync/ubuntu-9.10-server-i386.iso.zsync
#################### 100.0% 701.8 kBps DONE      

reading seed file ubuntu-9.10-server-i386.iso.part:
************************************************************************************************************************************************^C

$ ls -ltr
total 330268
-rw------- 1 root root 671686656 2009-11-07 17:03 ubuntu-9.10-server-i386.iso.part
-rw------- 1 root root 671686656 2009-11-07 17:03 rcksum-ZUfFCc

rcksum temporary file was created and left on the disk. Start the same
action again:

$ zsync http://server/zsync/ubuntu-9.10-server-i386.iso.zsync
#################### 100.0% 0.0 kBps DONE    

reading seed file ubuntu-9.10-server-i386.iso.part: ***************************************************************************************************************************^C
$ ls -ltr
total 482932
-rw------- 1 root root 671686656 2009-11-07 17:03 ubuntu-9.10-server-i386.iso.part
-rw------- 1 root root 671686656 2009-11-07 17:03 rcksum-ZUfFCc
-rw------- 1 root root 671686656 2009-11-07 17:04 rcksum-oBwWoL

New rcksum temporary file was created. Restart the process, wait till
download and interrupt with CTRL-C:

$ zsync http://server/zsync/ubuntu-9.10-server-i386.iso.zsync
#################### 100.0% 0.0 kBps DONE    

reading seed file ubuntu-9.10-server-i386.iso.part: ****************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read ubuntu-9.10-server-i386.iso.part. Target 26.9% complete.      
downloading from http://server/zsync/ubuntu-9.10-server-i386.iso:
#################--- 88.2% 11804.4 kBps 0:06 ETA  ^C

$ ls -ltr
total 896612
-rw------- 1 root root 671686656 2009-11-07 17:03 rcksum-ZUfFCc
-rw------- 1 root root 671686656 2009-11-07 17:04 rcksum-oBwWoL
-rw------- 1 root root 671686656 2009-11-07 17:05 ubuntu-9.10-server-i386.iso.part

No new rcksum temporay file left on the disk (was deleted by zsync
during the process). Restart the process and wait till end:

$ zsync http://server/zsync/ubuntu-9.10-server-i386.iso.zsync
#################### 100.0% 0.0 kBps DONE    

reading seed file ubuntu-9.10-server-i386.iso.part: ****************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read ubuntu-9.10-server-i386.iso.part. Target 89.9% complete.      
downloading from http://server/zsync/ubuntu-9.10-server-i386.iso:
#################### 100.0% 9784.0 kBps DONE      

verifying download...checksum matches OK
used 604180480 local, fetched 67506566

$ ls -ltr
total 962600
-rw------- 1 root root 671686656 2009-11-07 17:03 rcksum-ZUfFCc
-rw------- 1 root root 671686656 2009-11-07 17:04 rcksum-oBwWoL
-rw------- 1 root root 671686656 2009-11-07 17:08 ubuntu-9.10-server-i386.iso

SUMARY:
zsync has a bug from my point of view, rcksum-xxxxxx temporary files has to  be deleted before zsync exit (after CTRL-C or when disk runs out of space, etc).

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

-- 
rcksum-xxxxxx temporay files left on disk by zsync
https://bugs.launchpad.net/bugs/477551
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