[OE-core] what is the significance of the numeric version part of 'PV = "1.0.1+git${SRCPV}"'?

[Robert P. J. Day]

  i *thought* i understood this, but a colleague insists i don't so
... dumb question time.

  recently, i asked about the netdata recipe file "netdata_git.bb",
which contains the snippet:

  SRC_URI = "git://github.com/firehol/netdata.git;protocol=https"
  SRCREV = "36c1304e37094174ea51001903058e65053107ca"
  PV = "1.0.1+git${SRCPV}"

perhaps i've been wrong all this time, but i understood the above to
mean that the source checked out would be based on commit
36c1304e37094174ea51001903058e65053107ca, and that the "1.0.1+" part
of the PV variable was simply for aesthetics.

  i realize that the full value of PV would be used to generate the
final rpm files, and here's what i get:

  netdata-1.0.1+git0+36c1304e37-r0.0.ppc7400.rpm
  netdata-dbg-1.0.1+git0+36c1304e37-r0.0.ppc7400.rpm
  netdata-dev-1.0.1+git0+36c1304e37-r0.0.ppc7400.rpm

but is there some other significance or functionality associated with
that "1.0.1+" prefix for PV?

  the only thing i can think of is OE's algorithm for selecting the
most recent recipe. AIUI, if i have multiple versions for the same
recipe. all things being equal, OE would choose the "git" recipe file
over a numerically-versioned recipe file, correct?

  so, say i have two recipe files:

  netdata_1.0.2.bb
  netdata_git.bb

i assume that OE would choose the second one by default, even if,
internally, that "git" form of the recipe selected a SRCREV that might
represent an earlier commit than the 1.0.2 version.

  do i have that right? i'm quite prepared to be told i'm totally
off-base here. if this is explained in one of the YP docs, i'm happy
with a pointer to it, thanks.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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