RFC Proposed solution to bluez4/bluez5 selection

Here's a new approach to bluez5 integration for YOCTO #5031 based on RP's feedback from the last attempt.

Though the lib interface is supposedly compatible between bluez4 and bluez5 the dbus interface is not. The functionality differences are currently significant and likely to remain so. Therefore there will be no virtual/bluez as originally proposed in the defect report.

Selection of the provider of bluetooth services is mediated by DISTRO_FEATURES. As has been the case, "bluetooth" signifies support for bluetooth. Two new identifiers "bluez4" and "bluez5" distinguish the provider of bluetooth services, just as "systemd" and "sysvinit" distinguish the provider of init services.

Recipes that reference bluetooth now inherit from bluetooth.bbclass, which inspects the DISTRO_FEATURES and provides the variable BLUEZ as a default-defined variable with the value:
"" if "bluetooth" is not in DISTRO_FEATURES, else
"bluez5" if "bluez5" is in DISTRO_FEATURES, else
"bluez4"

The presence of "bluez4" or "bluez5" in PACKAGECONFIG is normally used to control configuration. (In some cases this is an "interface change" with respect to PACKAGECONFIG values for specific recipes but I don't see an alternative where existing keys are insufficiently precise.)

The assumption is most packages will support either bluez4 or bluez5. Existing packages that used "bluetooth" or "bluez" as the key to select an explicit dependence on bluez4 have mostly been changed to use "bluez4" as the key.

Where a package (e.g. pulseaudio) supports both variants with distinct configuration options PACKAGECONFIG settings for both "bluez4" and "bluez5" should be provided.

Where a package (e.g. connman) supports both variants without distinct configuration options the PACKAGECONFIG setting should be "bluez" and the dependence will be on "${BLUEZ}".

The following changes since commit ab63640fad50954b0440ab107c96dbd3f919ea4d:

gdk-pixbuf: use ptest-gnome (2014-11-25 13:03:30 +0000)

are available in the git repository at:

git://git.yoctoproject.org/poky-contrib pabigot/rfc-v2/bluez5
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=pabigot/rfc-v2/bluez5

Peter A. Bigot (9):
bluetooth.bbclass: simplify recipe inference of bluetooth provider
packagegroup-base: select distro preference for bluez provider
pulseaudio: select distro preference for bluez provider
qt-mobility: select distro preference for bluez provider gstreamer1.0-plugins-bad: select distro preference for bluez provider
ofono: select distro preference for bluez provider
neard: select distro preference for bluez provider
libpcap: select distro preference for bluez provider
connman: depend on distro provider of bluez

 meta/classes/bluetooth.bbclass                             | 14 ++++++++++++++
 meta/recipes-connectivity/connman/connman.inc              |  6 ++++--
 meta/recipes-connectivity/libpcap/libpcap.inc              |  6 ++++--
 meta/recipes-connectivity/neard/neard.inc                  |  4 ++--
 meta/recipes-connectivity/ofono/ofono.inc                  |  4 ++--
 meta/recipes-core/packagegroups/packagegroup-base.bb       |  3 ++-
 .../gstreamer/gstreamer1.0-plugins-bad.inc                 |  6 +++---
 .../gstreamer/gstreamer1.0-plugins-bad_git.bb              |  1 -
 meta/recipes-multimedia/pulseaudio/pulseaudio.inc          |  4 ++--
 meta/recipes-qt/qt4/qt-mobility_1.2.0.inc                  |  6 ++++--
 10 files changed, 37 insertions(+), 17 deletions(-)
 create mode 100644 meta/classes/bluetooth.bbclass

1.8.5.5