[Bug 1627641] Re: Backport netplan to xenial

[Martin Pitt]

** Description changed:

  For snappy (at first at least) we need to provide netplan in xenial, as
  for the first snappy GA release we must not use any PPAs any more.
  
  netplan's NetworkManager backend depends on two patches to read
  configuration and connections from /run/NetworkManager/. These will need
  to be backported for full netplan support; but they are not required for
  snappy as this will use a snapped NM. However, this will need a
  temporary hack
  (https://code.launchpad.net/%7Emorphis/netplan/+git/netplan/+merge/306607)
  until snaps can actually properly support OS components like
  NetworkManager.
  
  PATCHES:
  https://git.launchpad.net/~network-manager/network-manager/+git/ubuntu/commit/?h=xenial&id=6dcdb85
  https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h=ubuntu-xenial&id=4e9c52b0bb
  
  REGRESSION POTENTIAL:
  netplan: The risk for existing installations is practically zero as nplan does not exist in xenial yet and thus will not be pulled in during upgrades.
- NetworkManager: Nothing in xenial expects/uses /run/NetworkManager/ and as it's an ephemeral tmpfs there is no risk of existing files there. If the patches are broken it could in theory happen that NetworkManager also does not properly read files from /etc/NetworkManager/ any more, so the -proposed package must verify that existing connections still work.
- systemd: This does change behavior of networkd on restart, but the previous behaviour was arguably buggy. networkd is not being used by default or advertised in Ubuntu 16.04, so this will not affect the vast majority of installations.
+ 
+ NetworkManager: Nothing in xenial expects/uses /run/NetworkManager/ and
+ as it's an ephemeral tmpfs there is no risk of existing files there. If
+ the patches are broken it could in theory happen that NetworkManager
+ also does not properly read files from /etc/NetworkManager/ any more, so
+ the -proposed package must verify that existing connections still work.
+ 
+ systemd: This does change behavior of networkd quite a bit: RA is now
+ being handled in userpsace instead of the kernel, there are some new
+ virtual device types, LLDP support, etc., and there are no (known)
+ backwards incompatibilities. The 229 version was known buggy with DHCPv6
+ (we disabled these two test cases), and judging by the feedback in
+ Debian 231 is now reasonably stable. networkd is not being used by
+ default or advertised in Ubuntu 16.04 (so far), so this will not affect
+ the vast majority of installations. But while we have quite good test
+ coverage, it cannot be ruled out that we break some custom setup that
+ uses networkd.
  
  TEST PLAN:
  1. Run "NetworkManager --print-config" and save the output.
  2. Install the proposed NetworkManager and confirm that existing connections (from /etc/NetworkManager/system-connections) still work.
  3. Run "NetworkManager --print-config" again and verify that the output is the same as in step 1.
  4. netplan has a very comprehensive integration test suite run as autopkgtest, which covers NetworkManager (including the /run patches) and network. Confirm that it succeeds.

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https://bugs.launchpad.net/bugs/1627641

Title:
  Backport netplan to xenial

Status in network-manager package in Ubuntu:
  Fix Released
Status in nplan package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in network-manager source package in Xenial:
  Fix Committed
Status in nplan source package in Xenial:
  Fix Committed
Status in systemd source package in Xenial:
  In Progress

Bug description:
  For snappy (at first at least) we need to provide netplan in xenial,
  as for the first snappy GA release we must not use any PPAs any more.

  netplan's NetworkManager backend depends on two patches to read
  configuration and connections from /run/NetworkManager/. These will
  need to be backported for full netplan support; but they are not
  required for snappy as this will use a snapped NM. However, this will
  need a temporary hack
  (https://code.launchpad.net/%7Emorphis/netplan/+git/netplan/+merge/306607)
  until snaps can actually properly support OS components like
  NetworkManager.

  PATCHES:
  https://git.launchpad.net/~network-manager/network-manager/+git/ubuntu/commit/?h=xenial&id=6dcdb85
  https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h=ubuntu-xenial&id=4e9c52b0bb

  REGRESSION POTENTIAL:
  netplan: The risk for existing installations is practically zero as nplan does not exist in xenial yet and thus will not be pulled in during upgrades.

  NetworkManager: Nothing in xenial expects/uses /run/NetworkManager/
  and as it's an ephemeral tmpfs there is no risk of existing files
  there. If the patches are broken it could in theory happen that
  NetworkManager also does not properly read files from
  /etc/NetworkManager/ any more, so the -proposed package must verify
  that existing connections still work.

  systemd: This does change behavior of networkd quite a bit: RA is now
  being handled in userpsace instead of the kernel, there are some new
  virtual device types, LLDP support, etc., and there are no (known)
  backwards incompatibilities. The 229 version was known buggy with
  DHCPv6 (we disabled these two test cases), and judging by the feedback
  in Debian 231 is now reasonably stable. networkd is not being used by
  default or advertised in Ubuntu 16.04 (so far), so this will not
  affect the vast majority of installations. But while we have quite
  good test coverage, it cannot be ruled out that we break some custom
  setup that uses networkd.

  TEST PLAN:
  1. Run "NetworkManager --print-config" and save the output.
  2. Install the proposed NetworkManager and confirm that existing connections (from /etc/NetworkManager/system-connections) still work.
  3. Run "NetworkManager --print-config" again and verify that the output is the same as in step 1.
  4. netplan has a very comprehensive integration test suite run as autopkgtest, which covers NetworkManager (including the /run patches) and network. Confirm that it succeeds.

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