tree fb5552563c307056718f1775a2a38283fb3df37a
parent 9c415247dea2c3b5536fce3fc1f04c9e29eaedc5
author Joel Stanley <joel@jms.id.au> 1587094762 +0930
committer Joel Stanley <joel@jms.id.au> 1587434836 +0930

app: Change argument parsing and error handling

This modifies the way the application parses arguments and performs
error handling when invalid options are passed. There is no functional
change to the application aside from the error message that is printed
when incorrect options are passed.

If you do not pass a VPD file:

$ openpower-read-vpd --fru BMC --object /system/chassis/motherboard/bmc
VPD file required (--vpd=<filename>)

If you pass a VPD but no --object or --fru options:

$ openpower-read-vpd --vpd vpdfile
No task to perform

  Update FRU: --fru <type> --object <path>
              --fru <type1>,<type2> --object <path1>,<path2>

Signed-off-by: Joel Stanley <joel@jms.id.au>
Change-Id: I4d41b55d37516bbc0557127fcb441f6fd29698bf