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libpcp_import: support for an archive-append mode #1610

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libpcp_import: support for an archive-append mode #1610

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Commits on Jun 15, 2022

  1. libpcp_import: support for an archive-append mode 

    In order to implement sysstat/sar semantics, where an
archive is appended to by short-lived processes - and
not by a long-running process ala pmlogger - we're in
need of an append-mode from the LOGIMPORT(3) API.

This is a prototype of the sorts of changes I believe
we'll need.  I've updated just the one QA test utility
to exercise it at this stage and the rest will follow
once we've settled on appropriate APIs.
    @natoscott
    natoscott committed Jun 15, 2022
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  2. libpcp: add __pmLogAppend so log internals remain in libpcp 

    Refactor some new log-append code out of libpcp_import and
into libpcp; also ensure archive files are opened for read
only when we're not appending.
    @natoscott
    natoscott committed Jun 15, 2022
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