version-handler: Produce errors for unavailable data

We want to make it clear to the reader that the data is actually
unavailable vs reading outside the bounds of the data space.

version-handler: Produce errors for unavailable data

We want to make it clear to the reader that the data is actually
unavailable vs reading outside the bounds of the data space.

Change-Id: Ifb63dfe600c268af9e7df24397c28e20316dbb8f
Signed-off-by: William A. Kennington III <wak@google.com>

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version_handler: Support multiple sessions

We want to be able to support multiple concurrent readers of version
information. Otherwise, upstream version checks might fail if they end

version_handler: Support multiple sessions

We want to be able to support multiple concurrent readers of version
information. Otherwise, upstream version checks might fail if they end
up being sequenced concurrently.

Change-Id: I5420ad667622b7906e633562a5373e0be042c0c1
Signed-off-by: William A. Kennington III <wak@google.com>

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version_handler: Read doesn't need to catch missing sessions

The read() interface from phosphor-ipmi-blobs will never call read with
an invalid session, so we don't need to catch the exc

version_handler: Read doesn't need to catch missing sessions

The read() interface from phosphor-ipmi-blobs will never call read with
an invalid session, so we don't need to catch the exception if the
session doesn't exist.

Change-Id: I2ccb351b85d18a6eb96d4f92cfb3167a95f0509e
Signed-off-by: William A. Kennington III <wak@google.com>

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version-handler: Refactor handler construction

Instead of requiring callers to build maps and info blobs, take the
minimal required amount of information about the blob configuration and

version-handler: Refactor handler construction

Instead of requiring callers to build maps and info blobs, take the
minimal required amount of information about the blob configuration and
build required datastructures internally.

This reduces the amount of code, and nearly eliminates all of the
untested code in main.cpp.

Change-Id: Iaa398eb404814e9263e6707b71b38a9831d96697
Signed-off-by: William A. Kennington III <wak@google.com>

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version-handler: add version-handler, blob handler

Implement version-handler: a blob handler for retrieving version
information about a blob.

Problem: ipmi-flash(firmware-handle

version-handler: add version-handler, blob handler

Implement version-handler: a blob handler for retrieving version
information about a blob.

Problem: ipmi-flash(firmware-handler) provides a mechanism to transfer
firmware updates, verify them and perform updates but there is no
mechanism to interrogate the firmware for its version.

Solution: version-handler provides handlers for retrieving information
about firmware blobs. Adding "version" syntax to "/flash/blob" entries
in the json configuration file enables this feature.
The mechanism to retrieve version is identical to the mechanism used by
firmware-handler to perform preparation, verification and updates (kick
off systemd targets).

Signed-off-by: Jason Ling <jasonling@google.com>
Change-Id: I28868ca8dd76d63af668d2e46b9359401d45f0bc

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