group.of.nepali.translators team mailing list archive

[Scott Moser <smoser@xxxxxxxxxx>]

## launched a xenial instance
$ cat /etc/cloud/build.info
build_name: server
serial: 20170207


## Enable proposed
$ rel=$(lsb_release -sc)
$ line=$(awk '$1 == "deb" && $2 ~ /ubuntu.com/ {
  printf("%s %s %s-proposed main universe\n", $1, $2, rel); exit(0) };
  ' "rel=$rel" /etc/apt/sources.list)
$ echo "$line" | sudo tee /etc/apt/sources.list.d/proposed.list
$ sudo apt-get update -qy
$ sudo apt-get install -qy cloud-init grub-legacy-ec2

## copy -generic to -ec2
$ sudo sh -c 'for i in /boot/*-generic; do n=${i%-generic}-ec2; mv -v $i $n; done'
'/boot/System.map-4.4.0-62-generic' -> '/boot/System.map-4.4.0-62-ec2'
'/boot/abi-4.4.0-62-generic' -> '/boot/abi-4.4.0-62-ec2'
'/boot/config-4.4.0-62-generic' -> '/boot/config-4.4.0-62-ec2'
'/boot/initrd.img-4.4.0-62-generic' -> '/boot/initrd.img-4.4.0-62-ec2'
'/boot/vmlinuz-4.4.0-62-generic' -> '/boot/vmlinuz-4.4.0-62-ec2'

## run update-legacy-grub-ec2
$ sudo update-grub-legacy-ec2

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-4.4.0-62-generic
Replacing config file /run/grub/menu.lst with new version
Found kernel: /boot/vmlinuz-4.4.0-62-ec2
Replacing config file /run/grub/menu.lst with new version
Updating /boot/grub/menu.lst ... done


** Tags removed: verification-needed
** Tags added: verification-done

** Changed in: cloud-init (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1379080

Title:
  update-grub-legacy-ec2 fails to detect xen kernel

Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Fix Committed
Status in cloud-init source package in Yakkety:
  Confirmed
Status in cloud-init source package in Zesty:
  Fix Released

Bug description:
  The update-grub-legacy-ec2 script (which ships with grub-legacy-ec2,
  which is presumably included under cloud-init umbrella) includes a
  check to determine whether a kernel is Xen-capable or not. It uses
  this check in a feature designed to ignore non-Xen kernels on Xen
  guests, presumably as a safety mechanism. The way in which the check
  is executed is flawed - it matches against the kernel name. This means
  that if you are loading a kernel that has an 'unexpected' name,
  update-grub-legacy-ec2 will ignore the new kernel, regardless of
  whether or not it is actually Xen-capable. Output looks like this:

  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 ...
  Ignoring non-Xen Kernel on Xen domU host: vmlinuz-3.13.0-36-custom
  Found kernel: /boot/vmlinuz-3.13.0-36-generic
  Updating /boot/grub/menu.lst ... done

  This has been fixed on grub-legacy. Instead of matching the kernel
  name, it checks the config for CONFIG_XEN=y. In addition, Linux
  kernels come with CONFIG_XEN=y by default for some time now, and it is
  perfectly safe to run a Xen-capable kernel on non-Xen hosts.

  Steps to reproduce:
  1. Compile and generate debs for custom kernel with version string not including '-generic' or '-virtual'
  2. Install debs on ec2 system (ami-a94e0c99)
  3. Reboot

  Expected results:
  System comes up with new kernel

  Actual results:
  System comes up with old kernel, and new kernel is not present in /boot/grub/menu.lst

  Impact:
  Running ami-a94e0c99, and likely many others, a user can not install a custom kernel without manually editing files. Furthermore, those writes will likely be overwritten by administrative operations in the future.

  Recommendation:
  Update detection logic to search for CONFIG_XEN=y in the kernel config, and remove version string detection.

  Please let me know how I can help this along. I can submit a proposed
  fix, but am not sure where to send it.

  Related bugs:
   * bug 1655934: update-grub-legacy-ec2 should detect -aws kernels as appropriate for EC2

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