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[Balint Reczey <balint.reczey@xxxxxxxxxxxxx>]

Tested on Cosmic, Bionic and Xenial with the latest version in
-proposed:

ubuntu@ip-172-31-11-18:~$ dpkg -l ec2-hibinit-agent | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version                Architecture Description
+++-=================-======================-============-=================================
ii  ec2-hibinit-agent 1.0.0-0ubuntu4~18.10.0 all          Amazon EC2 hibernation agent
ubuntu@ip-172-31-11-18:~$ grep -m 1 root= /boot/grub/grub.cfg
	  linux	/boot/vmlinuz-4.18.0-1011-aws root=PARTUUID=71d081c0-01 ro  console=tty1 console=ttyS0 nvme_core.io_timeout=4294967295 no_console_suspend=1 resume_offset=245760 resume=PARTUUID=71d081c0-01


ubuntu@ip-172-31-7-41:~$  dpkg -l ec2-hibinit-agent | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version                Architecture Description
+++-=================-======================-============-=================================
ii  ec2-hibinit-agent 1.0.0-0ubuntu4~18.04.0 all          Amazon EC2 hibernation agent
ubuntu@ip-172-31-7-41:~$ grep -m 1 root= /boot/grub/grub.cfg
        linux	/boot/vmlinuz-4.15.0-1033-aws root=UUID=b5361850-7320-445b-b1c9-a8b294830484 ro  console=tty1 console=ttyS0 nvme.io_timeout=4294967295 no_console_suspend=1 resume_offset=235520 resume=/dev/xvda1


ubuntu@ip-172-31-12-48:~$ dpkg -l ec2-hibinit-agent | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version                Architecture Description
+++-=================-======================-============-=================================
ii  ec2-hibinit-agent 1.0.0-0ubuntu4~16.04.0 all          Amazon EC2 hibernation agent
ubuntu@ip-172-31-12-48:~$ grep -m 1 root= /boot/grub/grub.cfg
        linux	/boot/vmlinuz-4.4.0-1077-aws root=UUID=7d8f7a6c-6fdc-4cfe-a376-95b51a59f117 ro  console=tty1 console=ttyS0 nvme.io_timeout=4294967295 nvme_core.io_timeout=4294967295 no_console_suspend=1 resume_offset=346112 resume=/dev/xvda1


** Tags removed: verification-needed verification-needed-bionic verification-needed-cosmic verification-needed-trusty verification-needed-xenial
** Tags added: verification-done verification-done-bionic verification-done-cosmic verification-done-xenial

** Changed in: ec2-hibinit-agent (Ubuntu Trusty)
       Status: Fix Committed => Won't Fix

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https://bugs.launchpad.net/bugs/1818150

Title:
  Hibinit-agent configures GRUB referring to root partition as
  resume=/dev/root

Status in ec2-hibinit-agent package in Ubuntu:
  Fix Released
Status in ec2-hibinit-agent source package in Trusty:
  Won't Fix
Status in ec2-hibinit-agent source package in Xenial:
  Fix Committed
Status in ec2-hibinit-agent source package in Bionic:
  Fix Committed
Status in ec2-hibinit-agent source package in Cosmic:
  Fix Committed

Bug description:
  [Impact]

   * The kernel can't find /dev/root when booting initramfsless thus can't resume from hibernation
   * The fix sets resume=... to the same identifier passed as root=... on the kernel command when the swap file is found to be on /dev/root.

  [Test Case]

   * (Install and) start hibinit-agent on an EC2 instance supporting hibernation, then when it started successfully verify the grub configuration:
  $ grep -m 1 root= /boot/grub/grub.cfg
     linux	/boot/vmlinuz-4.18.0-1008-aws root=PARTUUID=6b4ea835-01 ro  console=tty1 console=ttyS0 nvme.io_timeout=4294967295 no_console_suspend=1 resume_offset=438272 resume=PARTUUID=6b4ea835-01

    resume=... must not refer to /dev/root with the default
  configuration, but to a block device known to the kernel without using
  initramfs.

  [Regression Potential]

   * Hibinit-agent may parse the grub configuration file incorrectly and
  set a wrong partition to resume from. Since the fix is quite small and
  the number of variants of grub configurations is also small this
  regression is unlikely.

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