ae6331f27e
When parsing the control groups to which the Elasticsearch process belongs, we extract a map from subsystems to paths by parsing /proc/self/cgroup. This file contains colon-delimited entries of the form hierarchy-ID:subsystem-list:cgroup-path. For control group version 1 hierarchies, the subsystem-list is a comma-delimited list of the subsystems for that hierarchy. For control group version 2 hierarchies (which can only exist on Linux kernels since version 4.5), the subsystem-list is an empty string. The previous parsing of /proc/self/cgroup incorrectly accounted for this possibility (a + instead of a * in a regular expression). This commit addresses this issue, adds a test case that covers this possibility, and simplifies the code that parses /proc/self/cgroup. Relates #23493 |
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