Bug 9655 - diff is giving incorrect output
diff is giving incorrect output
Status: CLOSED DUPLICATE of bug 9212
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
6.2
i386 Linux
medium Severity medium
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Assigned To: Cristian Gafton
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Reported: 2000-02-21 14:59 EST by Graham Cole
Modified: 2008-05-01 11:37 EDT (History)
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Doc Type: Bug Fix
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Last Closed: 2000-02-23 21:12:56 EST
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Description Graham Cole 2000-02-21 14:59:47 EST
when doing a "diff -uNr" on 2 directories that should be the same, diff
will claim that 2 files are different, but when i tried to verify that with
cmp file1 file2, the files compare successfully.

I pulled an iso image from a cdrom using "dd if=/dev/cdrom of=image.iso"
then I mounted the image over loopback using "mount -t iso9660 -o
ro,loop=/dev/loop0 image.iso /mnt/image"  then mounted the cdrom, and then
did a "diff -uNr /mnt/image /mnt/cdrom"

in fact, when I mount the same image twice over loopback under seperate
directories, I still get errors with diff, so I believe it is a problem
with diff itself.
Comment 1 Graham Cole 2000-02-21 20:33:59 EST
I don't think this is a diff problem anymore.  I copied the directory twice to
an ext2 filesystem (cp -dpr) from the directories where the images were mounted,
and some of the files were not copied (certian files were missed on each run).
I imagine it may be something wrong with mounting files over loopback or
possibly something with the iso9660 filesystem support.

I'm going to burn a second copy of the cd, mount one in a cd drive and the other
in my cdrw and then diff it and see what happens.
Comment 2 Graham Cole 2000-02-21 21:16:59 EST
Still getting similar results with 2 mounted cd's.
so it's independant of loopback.  Probably something with the iso9660 fs module.
I only have CD that this happens on, so it may be that there is something wrong
with that CD as well.
Comment 3 Graham Cole 2000-02-21 21:20:59 EST
did some reseach.  This bug looks VERY similar to Bug #9212
Comment 4 Preston Brown 2000-02-23 10:14:59 EST
gafton, either figure this out or pass to dledford.
Comment 5 Cristian Gafton 2000-02-23 21:12:59 EST
*** This bug has been marked as a duplicate of 9212 ***

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