GNU bug report logs - #21151
Strange behaviour when using interactive vs non-interactive mode - is this a bug?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Adam Baxter <voltagex <at> voltagex.org>
To: bug-parted <at> gnu.org
Subject: Strange behaviour when using interactive vs non-interactive mode - is
 this a bug?
Date: Tue, 28 Jul 2015 08:20:59 -0700

[Message part 1 (text/plain, inline)]

Hi all,
With the following script and parted 3.2

#!/bin/bash
image=blank.img
dd if=/dev/zero of=$image bs=1M count=32
sync
cat <<-EOF | parted -s $image
        mklabel msdos
        mkpart primary ext2 0 100%
        set 1 boot on
EOF
sync
file $image

I see different results if parted is invoked with -s or without.

*With* -s, the call to file results in "blank.img: data" and there's no
partitions in the disk image.
*Without* -s,

Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted)         mklabel msdos
(parted)         mkpart primary ext2 0 100%
Warning: The resulting partition is not properly aligned for best
performance.
(parted)         set 1 boot on
(parted) quit
blank.img: DOS/MBR boot sector; partition 1 : ID=0x83, active, start-CHS
(0x0,0,2), end-CHS (0x1ff,3,32), startsector 1, 65535 sectors

Removing the quit command makes no difference.

The script without -s will crash at least parted 2.3.


Thanks,
Adam Baxter

[Message part 2 (text/html, inline)]

Message #8 received at 21151 <at> debbugs.gnu.org (full text, mbox):

From: "Brian C. Lane" <bcl <at> redhat.com>
To: Adam Baxter <voltagex <at> voltagex.org>
Cc: 21151 <at> debbugs.gnu.org
Subject: Re: bug#21151: Strange behaviour when using interactive vs
 non-interactive mode - is this a bug?
Date: Tue, 28 Jul 2015 15:40:32 -0700

On Tue, Jul 28, 2015 at 08:20:59AM -0700, Adam Baxter wrote:
> Hi all,
> With the following script and parted 3.2
> 
> #!/bin/bash
> image=blank.img
> dd if=/dev/zero of=$image bs=1M count=32
> sync
> cat <<-EOF | parted -s $image
>         mklabel msdos
>         mkpart primary ext2 0 100%
>         set 1 boot on
> EOF
> sync
> file $image
> 
> I see different results if parted is invoked with -s or without.
> 
> *With* -s, the call to file results in "blank.img: data" and there's no
> partitions in the disk image.
> *Without* -s,

Don't put the commands on separate lines when using -s:

parted -s $image mklabel msdos mkpart primary ext2 0 100% set 1 boot on

> 
> Welcome to GNU Parted! Type 'help' to view a list of commands.
> (parted)         mklabel msdos
> (parted)         mkpart primary ext2 0 100%
> Warning: The resulting partition is not properly aligned for best
> performance.
> (parted)         set 1 boot on
> (parted) quit
> blank.img: DOS/MBR boot sector; partition 1 : ID=0x83, active, start-CHS
> (0x0,0,2), end-CHS (0x1ff,3,32), startsector 1, 65535 sectors
> 
> Removing the quit command makes no difference.
> 
> The script without -s will crash at least parted 2.3.

That's likely fixed in newer versions.

-- 
Brian C. Lane | Anaconda Team | IRC: bcl #anaconda | Port Orchard, WA (PST8PDT)

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