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If the user told us to read from a seed, we should not timeout quickly
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This is the same change made in DataSourceNoCloud, but to the
OVF DataSource.
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Previous logging was getting 'None' set in the DataSource collections.
Thus, 'log.debug' would throw error. I think it is proper to pull in
the base cloudinit's log.
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mount was taking 18 seconds when there was no media on a kvm guest.
a simple read should be about as quick as we can fail. The only other
thing to try would be to use cdrom.h and ioctl for CDROM_DRIVE_STATUS.
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After adding the 'log' element to the DataSource class, pickling would
fail with
TypeError: can't pickle file objects
Instead of having the object with a log reference, use one from
'DataSource.log' and have that set by cloudinit
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The DataSources that are loaded are now controlled entirely via
configuration file of 'datasource_list', like:
datasource_list: [ "NoCloud", "OVF", "Ec2" ]
Each item in that list is a "DataSourceCollection". for each item
in the list, cloudinit will attempt to load:
cloudinit.DataSource<item>
and, failing that,
DataSource<item>
The module is required to have a method named 'get_datasource_list'
in it that takes a single list of "dependencies" and returns
a list of python classes inside the collection that can run needing
only those dependencies.
The dependencies are defines in DataSource.py. Currently:
DEP_FILESYSTEM = "FILESYSTEM"
DEP_NETWORK = "NETWORK"
When 'get_datasource_list' is called for the DataSourceOVF module with
[DEP_FILESYSTEM], then DataSourceOVF returns a single item list with a
reference to the 'DataSourceOVF' class.
When 'get_datasource_list' is called for the DataSourceOVF module with
[DEP_FILESYSTEM, DEP_NETWORK], it will return a single item list
with a reference to 'DataSourceOVFNet'.
cloudinit will then instanciate the class and call its 'get_data' method.
if the get_data method returns 'True', then it selects this class as the
selected Datasource.
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