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Subject: bug#48081: diff on windows doest work with same path but different drives
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diff on windows doest work with same path but different drives

diff -urN D:\path1\ D:\path2  - works
diff -urN E:\path1\ D:\path1  - doest works, empty output

early version of diff was report "recursive directory loop"
but currently version of diff wholly empty output

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: dreverser@HIDDEN
Subject: bug#48081: Acknowledgement (diff on windows doest work with same
 path but different drives)
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Date: Wed, 28 Apr 2021 14:23:02 +0000

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Subject: bug#48081: Acknowledgement (diff on windows doest work with same path but different drives)
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after little research iam found the issue

iam using many cloned virtual disk drives
which has same serial number (becase was cloned)

diff uses "stat" call to get info about disk
so when i use sync between this disks
i have another mont drive letter  but same serial number, same path
diff -urN D:\path E:\path  give me there no diff, path the same

so i propose little fix for this
just edit at the file diffutils-3.7\lib\stat-w32.c

to "buf->st_dev" after assign "VolumeSerialNumber"
add disk drive letter
this will produce unique "st_dev"
and diff will work for such cases

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Subject: bug#48081: [bug-diffutils] bug#48081: Acknowledgement (diff on windows doest work with same path but different drives)
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Cc: 48081 <at> debbugs.gnu.org, Bruno Haible <bruno@HIDDEN>
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From: Paul Eggert <eggert@HIDDEN>
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Date: Thu, 29 Apr 2021 10:00:12 -0700
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On 4/29/21 8:16 AM, dreverser@HIDDEN wrote:
> so i propose little fix for this
> just edit at the file diffutils-3.7\lib\stat-w32.c
> 
> to "buf->st_dev" after assign "VolumeSerialNumber"
> add disk drive letter

Thanks for the suggestion. Although I don't use MS-Windows I will cc 
this email to someone who knows how stat-w32.c works. Bruno, you can see 
the thread here:

https://bugs.gnu.org/48081

Last modified: Thu, 29 Apr 2021 17:15:02 UTC

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