I believe I've found a bug in md5sum when it attempts to calculate on a
hard linked file in NTFS on Windows 7. Please read below for details.
-------- Forwarded Message --------
Subject: Re: Potential bug in md5sum
Date: Mon, 21 May 2018 19:22:32 +0200
From: Mathias Michaelis <mmx...@gmail.com>
To: billr1...@users.sourceforge.net
Hi Bill
md5sum is a part of the GNU coreutils package,
http://www.gnu.org/software/coreutils/coreutils.html. It was ported by
the gnuwin32 Project to Windows:
http://gnuwin32.sourceforge.net/packages/coreutils.htm. The cause of the
error you've reported is probably the fact the the gnuwin32 version of
md5sum is from April 21, 2005.
I'm not the programmer neither of the original version nor of the ported
one of md5sum and I have not any skills to change something on the
current state of this tool.
I don't know if it helps but there is also a native windows solution out
there:
https://support.microsoft.com/en-us/help/841290/availability-and-description-of-the-file-checksum-integrity-verifier-u
With best regards
Mathias
Am 21.05.2018 um 14:50 schrieb billr1...@users.sourceforge.net:
Mathias, I'm not sure if your package contains md5sum, but I've been
looking for a way to get in touch with that packages owner. md5sum
appears to have an issue with hard links in NTFS on Windows 7. md5sum
appears to be creating a value from the hardlink itself, not following
the link to the "real" file. An example of this is calc.exe found in
c:\windows\system32. I've included a line of powershell to get this
information.
get-childitem c:\windows\system32\calc.exe | format-list fullname, target
FullName : C:\windows\system32\calc.exe
Target :
{C:\Windows\winsxs\amd64_microsoft-windows-calc_31bf3856ad364e35_6.1.7600.16385_none_05b2f2e2346cfea4\calc.exe}
md5sum (get-childitem c:\windows\system32\calc.exe | select-object
-expand fullname)
\60b7c0fead45f2066e5b805a91f4f0fc *C:\windows\system32\calc.exe
md5sum (get-childitem c:\windows\system32\calc.exe | select-object
-expand target)
\10e4a1d2132ccb5c6759f038cdb6f3c9
*C:\Windows\winsxs\amd64_microsoft-windows-calc_31bf3856ad364e35_6.1.7600.16385_none_05b2f2e2346cfea4\calc.exe
If I copy calc.exe to c:\temp and run the md5sum against that file I
get the value that begins with '10e4'
copy-item c:\windows\system32\calc.exe c:\temp -force
md5sum c:\temp\calc.exe
\10e4a1d2132ccb5c6759f038cdb6f3c9 *c:\temp\calc.exe
If you are not the appropriate person (which is likely) would you
happen to know who I can forward this information to? Thanks for any
help you can provide.
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