[Bug 191480] New: pkg version locks database too long

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191480

            Bug ID: 191480
           Summary: pkg version locks database too long
           Product: Ports Tree
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: Infrastructure
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: freebsd at nagilum.org

Doing something like "pkg version -vL'=' can take several minutes especially on
smaller devices. During the whole time the database is locked. This prevents
any port being installed or removed. 
What I think is happening is something like this:
pkg creates a read cursor on the database and then walks from entry to entry to
obtain the ports version through some make command.
What it could be doing instead (to prevent the long locks) is something like
this:
Take the output of the query that was use to create the cursor and put it in a
list then process that list as it did with results of the cursor.

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