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I tested an UDF iso image with mount -o loop... and I was really
surprised, the mount changed the image. I am not sure what it writes to
the image, probably almost nothing (mount time stamp?) but the checksum
of the image is changed. It's very bad when you download something you
mount it (just to test) and then you want to check the checksum of the
file....
to check:
$ mkdir testdir
$ genisoimage -udf -o testimage.iso testdir/
...
$ sudo md5sum testimage.iso
92c720ac623ed697e222047b23935a0c testimage.iso
$ sudo mount -o loop testimage.iso /mnt
mount: block device /home/qji/testimage.iso is write-protected, mounting
read-only < --- mount says it's a read only mount
$ md5sum testimage.iso
0bc99bab37df097c5aabff7bc6a6de68 testimage.iso < --- checksum is already
changed
$ sudo umount /mnt
$ md5sum testimage.iso
0bc99bab37df097c5aabff7bc6a6de68 testimage.iso < --- umount doesn't
touch the file
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: mount udf
--
mount -o loop.... changes the udf image
https://bugs.launchpad.net/bugs/1277146
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