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Subject: bug#25233: parted is confused by ISO images, miscalculates sizes/offsets
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Date: Mon, 19 Dec 2016 13:19:15 +0100
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Hi all,

[My name is Bj=C3=B8rn 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 d=
ata:

  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 =3D 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 Typ=
e
  ubuntu-16.04-desktop-amd64.iso1 *          0 2902111 2902112  1.4G  0 Emp=
ty
  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,
Bj=C3=B8rn Forsman




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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: =?UTF-8?Q?Bj=C3=B8rn?= Forsman <bjorn.forsman@HIDDEN>
Subject: bug#25233: Acknowledgement (parted is confused by ISO images,
 miscalculates sizes/offsets)
Message-ID: <handler.25233.B.148216559220868.ack <at> debbugs.gnu.org>
References: <CAEYzJUEQzWPhBS2bcB-5=TwmFEeoP93TurCnL2Cgr1-YWnfVJg@HIDDEN>
X-Gnu-PR-Message: ack 25233
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Reply-To: 25233 <at> debbugs.gnu.org
Date: Mon, 19 Dec 2016 16:40:02 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

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has been received.

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If you wish to submit further information on this problem, please
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Please do not send mail to help-debbugs@HIDDEN unless you wish
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25233: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D25233
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems


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To: Phil Susi <psusi@HIDDEN>
Subject: bug#25233: closed (parted is confused by ISO images,
 miscalculates sizes/offsets)
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Your message dated Tue, 18 Apr 2017 11:23:59 -0400
with message-id <3e96b701-6514-1e8a-d248-3e4b4b84baf1@HIDDEN>
and subject line Re: bug#25233: parted is confused by ISO images, miscalcul=
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has caused the debbugs.gnu.org bug report #25233,
regarding parted is confused by ISO images, miscalculates sizes/offsets
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@HIDDEN)


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25233: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D25233
GNU Bug Tracking System
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Date: Mon, 19 Dec 2016 13:19:15 +0100
Message-ID: <CAEYzJUEQzWPhBS2bcB-5=TwmFEeoP93TurCnL2Cgr1-YWnfVJg@HIDDEN>
Subject: parted is confused by ISO images, miscalculates sizes/offsets
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Hi all,

[My name is Bj=C3=B8rn 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 d=
ata:

  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 =3D 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 Typ=
e
  ubuntu-16.04-desktop-amd64.iso1 *          0 2902111 2902112  1.4G  0 Emp=
ty
  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,
Bj=C3=B8rn Forsman



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Subject: Re: bug#25233: parted is confused by ISO images, miscalculates
 sizes/offsets
To: =?UTF-8?Q?Bj=c3=b8rn_Forsman?= <bjorn.forsman@HIDDEN>,
 25233-done <at> debbugs.gnu.org
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From: Phil Susi <psusi@HIDDEN>
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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.



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To: =?UTF-8?Q?Bj=C3=B8rn?= Forsman <bjorn.forsman@HIDDEN>
Subject: bug#25233: closed (Re: bug#25233: parted is confused by ISO
 images, miscalculates sizes/offsets)
Message-ID: <handler.25233.D25233.14925289474186.notifdone <at> debbugs.gnu.org>
References: <3e96b701-6514-1e8a-d248-3e4b4b84baf1@HIDDEN>
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Your bug report

#25233: parted is confused by ISO images, miscalculates sizes/offsets

which was filed against the parted package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 25233 <at> debbugs.gnu.org.

--=20
25233: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D25233
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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Subject: Re: bug#25233: parted is confused by ISO images, miscalculates
 sizes/offsets
To: =?UTF-8?Q?Bj=c3=b8rn_Forsman?= <bjorn.forsman@HIDDEN>,
 25233-done <at> debbugs.gnu.org
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From: Phil Susi <psusi@HIDDEN>
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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.



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Hi all,

[My name is Bj=C3=B8rn 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 d=
ata:

  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 =3D 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 Typ=
e
  ubuntu-16.04-desktop-amd64.iso1 *          0 2902111 2902112  1.4G  0 Emp=
ty
  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,
Bj=C3=B8rn Forsman



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On 18 April 2017 at 17:23, Phil Susi <psusi@HIDDEN> wrote:
> On 12/19/2016 7:19 AM, Bj=C3=B8rn Forsman wrote:
>> Hi all,
>>
>> [My name is Bj=C3=B8rn 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.

Ok. Maybe I was wrong about the parition table (don't know what I
expected). But the size of the image (5944MB) is wrong. The real file
is 1.5GB.

Best regards,
Bj=C3=B8rn Forsman




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reopen 25233
retitle 25233 hybrid iso reports 4x disk size with 2k sectors
thanks

On 4/18/2017 12:08 PM, Bjørn Forsman wrote:
> Ok. Maybe I was wrong about the parition table (don't know what I
> expected). But the size of the image (5944MB) is wrong. The real file
> is 1.5GB.

That looks like an error.  I'll look at it.





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Subject: Re: bug#25233: parted is confused by ISO images, miscalculates
 sizes/offsets
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reopen 25233
retitle 25233 hybrid iso reports 4x disk size with 2k sectors
thanks

On 4/18/2017 12:08 PM, Bjørn Forsman wrote:
> Ok. Maybe I was wrong about the parition table (don't know what I
> expected). But the size of the image (5944MB) is wrong. The real file
> is 1.5GB.

That looks like an error.  I'll look at it.





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  1.8 MISSING_SUBJECT        Missing Subject: header
  0.2 NO_SUBJECT             Extra score for no subject
  0.2 FREEMAIL_FORGED_FROMDOMAIN 2nd level domains in From and EnvelopeFrom
                              freemail headers are different
  0.0 T_DKIM_INVALID         DKIM-Signature header exists but is not valid

merge 26214 25233





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