drakenclimber / libcgroup / 12753541746

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api: Add extra debugging when matching rule to a group

In the context of a group rule (i.e. indicated by '@' used to prefix the
actual group name), getgrnam(3) is used to provide a pointer to a group
file entry that may contain a NULL-terminated array of pointers to group
members. A user can belong to multiple groups. With this information, we
then check the username that corresponds to the specified UID against
each group member for a match. This patch makes it possible to see this
information if debug level logging is enabled.

Use the new cgroup_get_loglevel() API to optimize the rule loop to
minimize performance impacts.

Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

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