On Feb 12 10:54, Brian Inglis via Cygwin wrote: > On 2025-02-12 10:30, Corinna Vinschen via Cygwin wrote: > > On Feb 12 17:32, Cedric Blancher via Cygwin wrote: > > > 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?
Tested with 9.0. I just installed 9.5 and the result after cp --sparse=auto is the same: $ cp --version | head -1 cp (GNU coreutils) 9.5 $ rm testcase17_sparse_begins_with_data.copy $ 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 20:01 testcase17_sparse_begins_with_data.copy Corinna -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
