why does sysfsutils-2.1.0.bb set S = "${WORKDIR}/sysfsutils-${PV}"?

["Robert P. J. Day" <rpjday@crashcourse.ca>]

  side note: the first in a small set of posts where i simply want to
clarify minor oddities i run across in oe-core, not because they have
any desperate need to be fixed, but more because when i'm teaching
courses in oe/yocto, i run across the occasional weirdness that
puzzles students, and forces me to try to explain it, and sometimes
the explanation is, "that's just silly." so here's the first one.

  as i read in bitbake.conf, the default source directory for any
recipe is defined as:

  S = "${WORKDIR}/${BP}"

which suggests that, as long as processing a recipe ends up using that
value as the source directory, there is no need for a recipe to
redefine S. kind of obvious, no?

  in the case of sysfsutils-2.1.0.bb, one sees the line:

S = "${WORKDIR}/sysfsutils-${PV}"

which, given the standard definitions for variables BP and PV, seems
to expand into precisely the default value given in bitbake.conf.

  so, unless i'm missing something, is there any actual need for that
line in the sysfsutils recipe file? is there something more subtle
going on here that i don't understand?

rday

-- 

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

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