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cloud-init will keep a 'status' file up to date for other applications
wishing to use it to determine cloud-init status.
It will manage 2 files:
status.json
result.json
The files will be written to /var/lib/cloud/data/ .
A symlink will be created in /run/cloud-init. The link from /run is to ensure
that if the file exists, it is not stale for this boot.
status.json's format is:
{
'v1': {
'init': {
errors: [] # list of strings for each error that occurred
start: float # time.time() that this stage started or None
end: float # time.time() that this stage finished or None
},
'init-local': {
'errors': [], 'start': <float>, 'end' <float> # (same as 'init' above)
},
'modules-config': {
'errors': [], 'start': <float>, 'end' <float> # (same as 'init' above)
},
'modules-final': {
'errors': [], 'start': <float>, 'end' <float> # (same as 'init' above)
},
'datasource': string describing datasource found or None
'stage': string representing stage that is currently running
('init', 'init-local', 'modules-final', 'modules-config', None)
if None, then no stage is running. Reader must read the start/end
of each of the above stages to determine the state.
}
result.json's format is:
{
'v1': {
'datasource': string describing the datasource found
'errors': [] # list of errors reported
}
}
Thus, to determine if cloud-init is finished:
fin = "/run/cloud-init/result.json"
if os.path.exists(fin):
ret = json.load(open(fin, "r"))
if len(ret['v1']['errors']):
print("Finished with errors:" + "\n".join(ret['v1']['errors']))
else:
print("Finished no errors")
else:
print("Not Finished")