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registry: remove units from etcd registry upon DestroyUnit()
So far each command "fleetctl destroy unit" has removed job entries from the etcd registry, under /_coreos.com/fleet/job. But it has not removed its unit file, under /_coreos.com/fleet/unit. As a result, fleet left lots of garbages in the etcd registry, so users had to manually clean them up. So this patch gets unit contents deleted actually from etcd registry when DestroyUnit() gets called. To avoid potential hash collisions, it first fetches a list of units from registry, to check there's any duplicated entry. Only if no duplicated unit is found, fleetd actually deletes the unit from registry. Fixes: coreos#1456 Fixes: coreos#1290 Reference: coreos#1291
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Dongsu Park
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Mar 24, 2016
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