[Bug 1534205] [NEW] cloud-initramfs-dyn-netconf should work without /etc/network/interfaces symlink

[Scott Moser]

Public bug reported:

See [1] for doc on cloud-initramfs-dyn-netconf.

cloud-initramfs-dyn-netconf takes klibc ipconfig output and writes /etc/network/interfaces (ENI) style file in /run/network/dynamic-interfaces.
The goal is to have the user's provided 'ip=' kernel parameters be "sticky" and not have the network interface get bounced by normal post-initramfs networking bringup.  Essentially kernel command line should override /etc/network/interfaces in a similar way to command line flags overriding environment or system configuration.

As it is right now, we have to have ln -sf /etc/network/interfaces /run/network/dynamic-interfaces in order for this to work.
That means:
 a.) if you've not done this, dyn-netconf isn't much use
 b.) if you *have* done this, but not provided ip= then you'll get you'll get no network configuration.

In xenial, the one necessary change from a cloud image to maas image is
this symlink, so that the image can work well with networking
information being provided on the kernel command line via network boot.

--
[1] http://bazaar.launchpad.net/~cloud-initramfs-tools/cloud-initramfs-tools/trunk/view/head:/dyn-netconf/doc/README.txt

** Affects: cloud-initramfs-tools (Ubuntu)
     Importance: High
         Status: Confirmed

** Changed in: cloud-initramfs-tools (Ubuntu)
       Status: New => Confirmed

** Changed in: cloud-initramfs-tools (Ubuntu)
   Importance: Undecided => High

** Description changed:

  See [1] for doc on cloud-initramfs-dyn-netconf.
  
  cloud-initramfs-dyn-netconf takes klibc ipconfig output and writes /etc/network/interfaces (ENI) style file in /run/network/dynamic-interfaces.
  The goal is to have the user's provided 'ip=' kernel parameters be "sticky" and not have the network interface get bounced by normal post-initramfs networking bringup.  Essentially kernel command line should override /etc/network/interfaces in a similar way to command line flags overriding environment or system configuration.
  
  As it is right now, we have to have ln -sf /etc/network/interfaces /run/network/dynamic-interfaces in order for this to work.
  That means:
-  a.) if you've not done this, dyn-netconf isn't much use
-  b.) if you *have* done this, but not provided ip= then you'll get you'll get no network configuration.
+  a.) if you've not done this, dyn-netconf isn't much use
+  b.) if you *have* done this, but not provided ip= then you'll get you'll get no network configuration.
+ 
+ In xenial, the one necessary change from a cloud image to maas image is
+ this symlink, so that the image can work well with networking
+ information being provided on the kernel command line via network boot.
  
  --
  [1] http://bazaar.launchpad.net/~cloud-initramfs-tools/cloud-initramfs-tools/trunk/view/head:/dyn-netconf/doc/README.txt

-- 
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https://bugs.launchpad.net/bugs/1534205

Title:
  cloud-initramfs-dyn-netconf should work without
  /etc/network/interfaces symlink

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