Re: [Help-tar] Same text file on different OS packed by tar, the tar file has different md5 value.

[Reuti]

> Am 14.12.2018 um 08:28 schrieb ice black <address@hidden>:
> 
> Why are tar generating different tar file on different OS for the same text 
> file? Here is how to reproduce the problem:

tar also stores user, group and date information of a file.

-- Reuti


> 
> This is host 1:
> US[keli@ tmp]uname -a
> Linux Smiles-station-001 4.4.0-040400-generic #201601101930 SMP Mon Jan 11 
> 00:32:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
> US[keli@ tmp]tar --version
> tar (GNU tar) 1.28
> Copyright (C) 2014 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> 
> Written by John Gilmore and Jay Fenlason.
> US[keli@ tmp]echo "hello" >test.txt
> US[keli@ tmp]tar -cf test.tar test.txt
> US[keli@ tmp]md5sum test.txt test.tar 
> b1946ac92492d2347c6235b4d2611184  test.txt
> 40b61cbcd8c4144fa224f40927be2869  test.tar
> 
> This is host 2:
> U18.04.S225[keli@ tmp]uname -a
> Linux smiles-Precision-T7500 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 
> 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
> 
> U18.04.S225[keli@ tmp]tar --version
> tar (GNU tar) 1.29
> Copyright (C) 2015 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> 
> Written by John Gilmore and Jay Fenlason.
> U18.04.S225[keli@ tmp]tar -cf test.tar test.txt
> U18.04.S225[keli@ tmp]md5sum test.txt test.tar 
> b1946ac92492d2347c6235b4d2611184  test.txt
> dae6737634e6f1c381fae91fae8e1e04  test.tar
> 
> It's obvious that the test.txt file have same md5 value, but the tar file 
> generate by same file have different md5 values. I am wondering the reason. 
> Is it related to kerner version or tar version?  Any help? Thanks.
>