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ds-identify is run here from the generator. If ds-identify does
not see any datasources, it can completely disable cloud-init.
The big value in this is that if there is no datasource, no python
will ever be loaded, and cloud-init will be disabled.o
The default policy being added here is:
search,found=all,maybe=all,notfound=disabled
That means:
- enable (in 'datasource_list') all sources that are found.
- if none are found, enable all 'maybe'.
- if no maybe are found, then disable cloud-init.
On platforms without DMI (everything except for aarch64 and x86),
the default 'notfound' setting is 'enabled'. This is because many of
the detection mechanisms rely on dmi data, which is present only on
x86 and aarch64.
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This adds some function to the generator to maintain the presense of a
flag file '/run/cloud-init/enabled' indicating that cloud-init is enabled.
Then, only run the dhclient hooks if on Azure and cloud-init is enabled.
The test for is_azure currently only checks to see that the board vendor
is Microsoft, not actually that we are on azure. Running should not be
harmful anywhere, other than slowing down dhclient.
The value of this additional code is that then dhclient having run
does not task the system with the load of cloud-init.
Additionally, some changes to config are done here.
* rename 'dhclient_leases' to 'dhclient_lease_file'
* move that to the datasource config (datasource/Azure/dhclient_lease_file)
Also, it removes the config in config/cloud.cfg that set agent_command
to __builtin__. This means that by default cloud-init still needs
the agent installed. The suggested follow-on improvement is to
use __builtin__ if there is no walinux-agent installed.
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This didn't really work. See bug for more info.
LP: #1577844
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Note, still broken as cloud-init local is not going to ever touch the
CI_NET_READY file (/run/cloud-init/network-config-ready).
So as this is , it will actually just block for 60 seconds and go on.
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This might need cleaning up in the future as I believe in some
containers /proc/cmdline is provided, and in that case it would
be preferred to pid 1's command line.
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This gets installed in /lib/systemd/system/cloud-init.target
and then is called to generate the symlink (or not generate the
symlink) for the cloud-init target.
The end result is cloud-init can be completely disabled
by:
touch /etc/cloud/cloud-init.disabled
or a kernel command line with 'cloud-init=disabled'
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