DO NOT REPLY [Bug 7337] New: sparse files not equally sparse on destination

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=7337

           Summary: sparse files not equally sparse on destination
           Product: rsync
           Version: 3.0.7
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: brian at interlinx.bc.ca
         QAContact: rsync-qa at samba.org


If I create a 0 block sparse file and then rsync it, it's not 0 blocks on the
copy.  Here's a reproducer:

$ rsync --version
rsync  version 3.0.7  protocol version 30
Copyright (C) 1996-2009 by Andrew Tridgell, Wayne Davison, and others.
Web site: http://rsync.samba.org/
Capabilities:
    64-bit files, 64-bit inums, 32-bit timestamps, 64-bit long ints,
    socketpairs, hardlinks, symlinks, IPv6, batchfiles, inplace,
    append, ACLs, xattrs, iconv, symtimes

rsync comes with ABSOLUTELY NO WARRANTY.  This is free software, and you
are welcome to redistribute it under certain conditions.  See the GNU
General Public Licence for details.
$ dd if=/dev/zero of=/tmp/sparse_file bs=1M count=0 seek=5
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000125157 s, 0.0 kB/s
$ ls -ls /tmp/sparse_file
0 -rw-r--r-- 1 brian brian 5242880 2010-04-08 10:33 /tmp/sparse_file
$ rsync --sparse /tmp/sparse_file /var/tmp
$ ls -ls /var/tmp/sparse_file 
12 -rw-r--r-- 1 brian brian 5242880 2010-04-08 10:34 /var/tmp/sparse_file

Notice the source file is 0 blocks long and the destination is 12 blocks long.

Gnutar on the other hand makes the destination as sparse as the source:

$ tar CcSvf /tmp - sparse_file | tar Cxvf /var/tmp/ -
sparse_file
sparse_file
$ ls -ls /var/tmp/sparse_file 
0 -rw-r--r-- 1 brian brian 5242880 2010-04-08 10:33 /var/tmp/sparse_file


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