first time looking closely at pkg_postinst_* routines, so can
someone clarify the use of "$D" in those routines? at the moment, i'm
*guessing* that those routines need to be able to run in two different
contexts (but i could be wrong):
1) at image creation time
2) at later package installation time on a running system
i'm aware that bitbake requires the use of curly braces, so always
must use "${D}", so in something like this from xorg-font-common.inc,
how does OE process this shell function? as in, what context do those
routines run in?
pkg_postinst_${PN} () {
for fontdir in `find $D/usr/lib/X11/fonts -type d`; do
mkfontdir $fontdir
mkfontscale $fontdir
done
for fontdir in `find $D/usr/share/fonts/X11 -type d`; do
mkfontdir $fontdir
mkfontscale $fontdir
done
}
it seems(?) clear that testing $D is the way to tell which of the two
contexts one is running in, as in:
pkg_postinst_${PN}_class-target () {
if [ "x$D" != "x" ]; then
rootarg="--root $D"
else
rootarg=""
fi
... snip ...
such that if $D is the empty string, then you're in the context of a
running system. am i close?
rday
p.s. i notice there are two ways that $D is used to define the
context. in some cases, just using it (as in the first example above)
is sufficient, while in other cases (as in the second case), the
routine needs to actually test the value.
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