cookerdata: Add support for BBFILES_DYNAMIC

BBFILES_DYNAMIC can be used to activate content only when some other
layers are present. The other layers are identified by the collections
that they define.

The main use case is to avoid .bbappends without the corresponding .bb
file in layers that want to modify other layers via .bbappends without
introducing a hard dependency on those other layers. .bb files could
also be handled via BBFILES_DYNAMIC.

Entries in BBFILES_DYNAMIC must have the form <collection
name>:<filename pattern>. Example usage:
 BBFILES_DYNAMIC += " \
     clang-layer:${LAYERDIR}/bbappends/meta-clang/*/*/*.bbappend \
     core:${LAYERDIR}/bbappends/openembedded-core/meta/*/*/*.bbappend \
 "

Parsing is aborted when invalid entries are found with an error
message like this:

 ERROR: BBFILES_DYNAMIC entries must be of the form <collection name>:<filename pattern>, not:
     /work/my-layer/bbappends/meta-security-isafw/*/*/*.bbappend
     /work/my-layer/bbappends/openembedded-core/meta/*/*/*.bbappend

Based on a patch by Richard Purdie.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/bb/cookerdata.py b/lib/bb/cookerdata.py
index 722d86024..aa96f54e5 100644
--- a/lib/bb/cookerdata.py
+++ b/lib/bb/cookerdata.py
@@ -346,6 +346,20 @@ class CookerDataBuilder(object):
             data.delVar('LAYERDIR_RE')
             data.delVar('LAYERDIR')
 
+            bbfiles_dynamic = (data.getVar('BBFILES_DYNAMIC') or "").split()
+            collections = (data.getVar('BBFILE_COLLECTIONS') or "").split()
+            invalid = []
+            for entry in bbfiles_dynamic:
+                parts = entry.split(":", 1)
+                if len(parts) != 2:
+                    invalid.append(entry)
+                    continue
+                l, f = parts
+                if l in collections:
+                    data.appendVar("BBFILES", " " + f)
+            if invalid:
+                bb.fatal("BBFILES_DYNAMIC entries must be of the form <collection name>:<filename pattern>, not:\n    %s" % "\n    ".join(invalid))
+
         if not data.getVar("BBPATH"):
             msg = "The BBPATH variable is not set"
             if not layerconf: