bitbake: layerindexlib: Initial layer index processing module implementation

The layer index module is expected to be used by various parts of the system
in order to access a layerindex-web (such as layers.openembedded.org) and
perform basic processing on the information, such as dependency scanning.

Along with the layerindex implementation are associated tests.  The tests
properly honor BB_SKIP_NETTESTS='yes' to prevent test failures.

Tests Implemented:
   - Branch, LayerItem, LayerBranch, LayerDependency, Recipe, Machine and
      Distro objects
   - LayerIndex setup using the layers.openembedded.org restapi
   - LayerIndex storing and retrieving from a file
   - LayerIndex verify dependency resolution ordering
   - LayerIndex setup using simulated cooker data

(Bitbake rev: fd0ee6c10dbb5592731e56f4c592fe687682a3e6)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/layerindexlib/tests/testdata/README

@@ -0,0 +1,11 @@
+This test data is used to verify the 'cooker' module of the layerindex.
+
+The module consists of a faux project bblayers.conf with four layers defined.
+
+layer1 - openembedded-core
+layer2 - networking-layer
+layer3 - meta-python
+layer4 - openembedded-layer (meta-oe)
+
+Since we do not have a fully populated cooker, we use this to test the
+basic index generation, and not any deep recipe based contents.

bitbake/lib/layerindexlib/tests/testdata/build/conf/bblayers.conf

@@ -0,0 +1,15 @@
+LAYERSERIES_CORENAMES = "sumo"
+
+# LAYER_CONF_VERSION is increased each time build/conf/bblayers.conf
+# changes incompatibly
+LCONF_VERSION = "7"
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+
+BBLAYERS ?= " \
+  ${TOPDIR}/layer1 \
+  ${TOPDIR}/layer2 \
+  ${TOPDIR}/layer3 \
+  ${TOPDIR}/layer4 \
+  "

bitbake/lib/layerindexlib/tests/testdata/layer1/conf/layer.conf

@@ -0,0 +1,17 @@
+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+# We have recipes-* directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb"
+
+BBFILE_COLLECTIONS += "core"
+BBFILE_PATTERN_core = "^${LAYERDIR}/"
+BBFILE_PRIORITY_core = "5"
+
+LAYERSERIES_CORENAMES = "sumo"
+
+# This should only be incremented on significant changes that will
+# cause compatibility issues with other layers
+LAYERVERSION_core = "11"
+LAYERSERIES_COMPAT_core = "sumo"
+
+BBLAYERS_LAYERINDEX_NAME_core = "openembedded-core"

bitbake/lib/layerindexlib/tests/testdata/layer2/conf/layer.conf

@@ -0,0 +1,20 @@
+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have a packages directory, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
+            ${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "networking-layer"
+BBFILE_PATTERN_networking-layer := "^${LAYERDIR}/"
+BBFILE_PRIORITY_networking-layer = "5"
+
+# This should only be incremented on significant changes that will
+# cause compatibility issues with other layers
+LAYERVERSION_networking-layer = "1"
+
+LAYERDEPENDS_networking-layer = "core"
+LAYERDEPENDS_networking-layer += "openembedded-layer"
+LAYERDEPENDS_networking-layer += "meta-python"
+
+LAYERSERIES_COMPAT_networking-layer = "sumo"

bitbake/lib/layerindexlib/tests/testdata/layer3/conf/layer.conf

@@ -0,0 +1,19 @@
+# We might have a conf and classes directory, append to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have recipes directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes*/*/*.bb ${LAYERDIR}/recipes*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "meta-python"
+BBFILE_PATTERN_meta-python := "^${LAYERDIR}/"
+BBFILE_PRIORITY_meta-python = "7"
+
+# This should only be incremented on significant changes that will
+# cause compatibility issues with other layers
+LAYERVERSION_meta-python = "1"
+
+LAYERDEPENDS_meta-python = "core openembedded-layer"
+
+LAYERSERIES_COMPAT_meta-python = "sumo"
+
+LICENSE_PATH += "${LAYERDIR}/licenses"

bitbake/lib/layerindexlib/tests/testdata/layer4/conf/layer.conf

@@ -0,0 +1,22 @@
+# We have a conf and classes directory, append to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have a recipes directory, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb ${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "openembedded-layer"
+BBFILE_PATTERN_openembedded-layer := "^${LAYERDIR}/"
+
+# Define the priority for recipes (.bb files) from this layer,
+# choosing carefully how this layer interacts with all of the
+# other layers.
+
+BBFILE_PRIORITY_openembedded-layer = "6"
+
+# This should only be incremented on significant changes that will
+# cause compatibility issues with other layers
+LAYERVERSION_openembedded-layer = "1"
+
+LAYERDEPENDS_openembedded-layer = "core"
+
+LAYERSERIES_COMPAT_openembedded-layer = "sumo"