[Bug 1642903] Re: introduce disk/by-id (model_serial) symlinks for NVMe drives

[Dan Streetman]

> Note that there is a current SRU in trusty which blocks this.

is that current SRU for bug 1562344?

> But this being "wishlist" it's not
> that urgent anyway, 

This isn't really wishlist, this is needed to persistently identify NVMe
drives on systems with multiple drives.

> and my gut feeling is that it's okay to wait a bit until we get some more
> fixes queued up?

I'd like to see this patch get started in trusty-proposed sooner than
later, is it possible to go ahead with this for trusty?  (and can we
also add the workaround patch for bug 1647485?)

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https://bugs.launchpad.net/bugs/1642903

Title:
  introduce disk/by-id (model_serial) symlinks for NVMe drives

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Trusty:
  In Progress
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Yakkety:
  Fix Committed
Status in systemd source package in Zesty:
  Fix Released

Bug description:
  [Impact]

  NVMe drives can't be identified/accessed via /dev/disk/by-id/nvme-
  SERIAL symlinks.

  [Test Case]

  On a system with an NVMe drive, check the /dev/disk/by-id/ directory;
  with the patch, it will contain link(s) named by the drive serial
  number. This should be the *only* change in `ls -l /dev/disk/*/*`.

  On a system without NVMe, verify that `ls -l /dev/disk/*/*` is
  identical (aside from dates, of course) before and after the upgrade
  to the -proposed version.

  [Regression Potential]

  Errors in udev rules can lead to an unbootable or otherwise completely
  broken system if they unintentionally break or  clobber existing
  /dev/disks/ symlinks.

  [Other Info]

  This patch is already included upstream and in zesty systemd.

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