host env leaks into grub

[aeva black]

When building images on a dual-boot host, I noticed that /dev/sda is leaking into the build's grub config. This is visible during the build process (pasted below) and in the resulting /boot/grub/grub.cfg file inside the image.

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Example output from the build:

Setting up linux-image-extra-3.5.0-26-generic (3.5.0-26.42) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.5.0-26-generic /boot/vmlinuz-3.5.0-26-generic
update-initramfs: Generating /boot/initrd.img-3.5.0-26-generic
df: Warning: cannot read table of mounted file systems
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.5.0-26-generic /boot/vmlinuz-3.5.0-26-generic
run-parts: executing /etc/kernel/postinst.d/x-grub-legacy-ec2 3.5.0-26-generic /boot/vmlinuz-3.5.0-26-generic
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-3.5.0-26-generic
Found kernel: /boot/vmlinuz-3.5.0-17-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done

run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.5.0-26-generic /boot/vmlinuz-3.5.0-26-generic
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.5.0-26-generic
Found initrd image: /boot/initrd.img-3.5.0-26-generic
Found linux image: /boot/vmlinuz-3.5.0-17-generic
Found initrd image: /boot/initrd.img-3.5.0-17-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 7 (loader) on /dev/sda1
Found Windows 7 (loader) on /dev/sda2
Found Windows Recovery Environment (loader) on /dev/sda3
done

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/107636

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/107636
Committed: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=697e771e4db7f0a1bbf218c69f146ded6315fc51
Submitter: Jenkins
Branch: master

commit 697e771e4db7f0a1bbf218c69f146ded6315fc51
Author: Sandhya Ganapathy <email address hidden>
Date: Thu Jul 17 15:22:34 2014 +0530

    Fix for host env leak into grub

    While building images in a dual boot host,
    /dev/sda is leaking into build's grub config.
    It is visible in the logs that the commands
    GRUB-INSTALL and GRUB-MKCONFIG probes Host OS environment.
    This is avoided by setting grub_disable_os_prober
    to true in /default/grub config file.

    Change-Id: I7408de7b3bc8a62f8bf103f00a88a596f988353c
    Closes-Bug: 1166491