[debbugs-tracker] bug#25233: closed (parted is confused by ISO images, miscalculates sizes/offsets)

[GNU bug Tracking System]

Your message dated Tue, 18 Apr 2017 11:23:59 -0400
with message-id <address@hidden>
and subject line Re: bug#25233: parted is confused by ISO images, miscalculates 
sizes/offsets
has caused the debbugs.gnu.org bug report #25233,
regarding parted is confused by ISO images, miscalculates sizes/offsets
to be marked as done.

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25233: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25233
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> --- Begin Message ---
>
>
>
> Subject: 
>
> parted is confused by ISO images, miscalculates sizes/offsets
>
>
>
>
> Date: 
>
> Mon, 19 Dec 2016 13:19:15 +0100
>
>
>
>
> Hi all,
>
> [My name is Bjørn Forsman, end user of parted, I'm using parted as my
> primary partitioning tool.]
>
> When I run parted (latest version, 3.2) on an ISO file, it gets
> confused about the block size:
>
>   $ parted ubuntu-16.04-desktop-amd64.iso p
>   WARNING: You are not superuser.  Watch out for permissions.
>   Warning: The driver descriptor says the physical block size is 2048
> bytes, but Linux says it is 512 bytes.
>   Ignore/Cancel?
>
> If I select "Ignore", it misinterprets the size and the partition table:
>
>   Model:  (file)
>   Disk /home/bfo/Downloads/ubuntu-16.04-desktop-amd64.iso: 5944MB
>   Sector size (logical/physical): 2048B/512B
>   Partition Table: mac
>   Disk Flags:
>
>   Number  Start   End     Size    File system  Name   Flags
>    1      2048B   6143B   4096B                Apple
>    2      1479MB  1481MB  2425kB               EFI
>
> And if I select "Cancel" it gets the size right but doesn't show any more data:
>
>   Model:  (file)
>   Disk /home/bfo/Downloads/ubuntu-16.04-desktop-amd64.iso: 1486MB
>   Sector size (logical/physical): 512B/512B
>   Partition Table: unknown
>   Disk Flags:
>
> Why cannot parted handle this like fdisk?
>
>   $ fdisk -l ubuntu-16.04-desktop-amd64.iso
>   Disk ubuntu-16.04-desktop-amd64.iso: 1.4 GiB, 1485881344 bytes,
> 2902112 sectors
>   Units: sectors of 1 * 512 = 512 bytes
>   Sector size (logical/physical): 512 bytes / 512 bytes
>   I/O size (minimum/optimal): 512 bytes / 512 bytes
>   Disklabel type: dos
>   Disk identifier: 0x0e0e8e70
>
>   Device                          Boot   Start     End Sectors  Size Id Type
>   ubuntu-16.04-desktop-amd64.iso1 *          0 2902111 2902112  1.4G  0 Empty
>   ubuntu-16.04-desktop-amd64.iso2      2888004 2892739    4736  2.3M
> ef EFI (FAT-12/16/32)
>
> I wonder if commit f98f791e19669b900345dad7d96ea4df974e4596
> ("libparted: device mapper uses 512b sectors") fixes this.
> This commit is from february 2015. Any plans on making a new release?
> (I'm an end user, I use released software.)
>
> Best regards,
> Bjørn Forsman
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#25233: parted is confused by ISO images, miscalculates sizes/offsets
>
>
>
>
> Date: 
>
> Tue, 18 Apr 2017 11:23:59 -0400
>
>
>
>
> User-agent: 
>
> Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0
>
>
>
>
> On 12/19/2016 7:19 AM, Bjørn Forsman wrote:
> > Hi all,
> > 
> > [My name is Bjørn Forsman, end user of parted, I'm using parted as my
> > primary partitioning tool.]
> > 
> > When I run parted (latest version, 3.2) on an ISO file, it gets
> > confused about the block size:
> > 
> >   $ parted ubuntu-16.04-desktop-amd64.iso p
> >   WARNING: You are not superuser.  Watch out for permissions.
> >   Warning: The driver descriptor says the physical block size is 2048
> > bytes, but Linux says it is 512 bytes.
> >   Ignore/Cancel?
>
> This is because the image contains a mac partition table using a block
> size of 2048 bytes since the image is meant to go on a cdrom, which has
> a sector size of 2048 bytes.
>
> > If I select "Ignore", it misinterprets the size and the partition table:
> > 
> >   Model:  (file)
> >   Disk /home/bfo/Downloads/ubuntu-16.04-desktop-amd64.iso: 5944MB
> >   Sector size (logical/physical): 2048B/512B
> >   Partition Table: mac
> >   Disk Flags:
> > 
> >   Number  Start   End     Size    File system  Name   Flags
> >    1      2048B   6143B   4096B                Apple
> >    2      1479MB  1481MB  2425kB               EFI
>
> No; that is correctly interpreting the partition table.
>
> > And if I select "Cancel" it gets the size right but doesn't show any more 
> > data:
> > 
> >   Model:  (file)
> >   Disk /home/bfo/Downloads/ubuntu-16.04-desktop-amd64.iso: 1486MB
> >   Sector size (logical/physical): 512B/512B
> >   Partition Table: unknown
> >   Disk Flags:
>
> This has the size wrong, and shows no data since you bailed out of
> trying to interpret the mac partition table.
>
> > Why cannot parted handle this like fdisk?
>
> Because fdisk does not know about mac partition tables.
>
>
>
> --- End Message ---