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Message-ID: <20b723b1-394c-4ab6-ba96-c711e5c34414@SystematicSW.ab.ca>
Date: Wed, 12 Feb 2025 10:54:02 -0700
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Subject: Re: /bin/cp of sparse files broken in
 3.6.0-0.362.g68c13dc92f65.x86_64?
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To: cygwin AT cygwin DOT com
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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On 2025-02-12 10:30, Corinna Vinschen via Cygwin wrote:
> On Feb 12 17:32, Cedric Blancher via Cygwin wrote:
>> Good afternoon!
>>
>> Is copying sparse files broken in 3.6.0-0.362.g68c13dc92f65.x86_64?
>>
>> cp --version
>> cp (GNU coreutils) 9.5
>> Packaged by Cygwin (9.5-1
>>
>> Checklist:
>> - Volume has FILE_SUPPORTS_SPARSE_FILES
>> - Cygwin mount has "sparse" option (mount Y: -o sparse,exec /cygdrive/y)
>> - source file has FILE_ATTRIBUTE_SPARSE_FILE set
>>
>> But  cp --sparse=auto ... or any other combination of --sparse does
>> copy holes, i.e. turns 500GB of hole into 500GB of data (zero bytes).
>>
>> echo "hello sparse file\n" >testcase17_sparse_begins_with_data && dd
>> if=/dev/null of=testcase17_sparse_begins_with_data oflag=append bs=1
>> count=1 seek=$((65536*512)) && echo "endoffile"
>>>> testcase17_sparse_begins_with_data
> 
> Works for me:
> 
> $ uname -r
> 3.6.0-0.362.g68c13dc92f65.x86_64
> 
> $ pwd
> /home/corinna/tmp
> 
> $ mount | grep tmp
> C:/cygwin64/home/corinna/tmp on /home/corinna/tmp type ntfs (binary,sparse,user,bind)
> 
> $ echo "hello sparse file\n" >testcase17_sparse_begins_with_data && dd if=/dev/null of=testcase17_sparse_begins_with_data oflag=append bs=1 count=1 seek=$((65536*512)) && echo "endoffile" >>testcase17_sparse_begins_with_data
> 
> $ ls -gGsh testcase17*
> 128K -rw----r--+ 1 33M Feb 12 18:22 testcase17_sparse_begins_with_data
> 
> $ cp --sparse=auto testcase17_sparse_begins_with_data testcase17_sparse_begins_with_data.copy
> 
> $ ls -gGsh testcase17*
> 128K -rw----r--+ 1 33M Feb 12 18:22 testcase17_sparse_begins_with_data
> 128K -rw----r--+ 1 33M Feb 12 18:23 testcase17_sparse_begins_with_data.copy

Hi Corinna,

Did you test using coreutils current stable 9.0, test 9.5, or both?

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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