lib/packagedata.py: Add API to iterate over rprovides

Adds an API that makes it easier to iterate over the package data for a
all providers of a runtime dependency.

(From OE-Core rev: 68bdc219a4a819e83217f5b54c463624af8d3b9e)

(From OE-Core rev: 579717212ba2892e32315788ccd65320556d32a3)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/lib/oe/packagedata.py

@@ -108,3 +108,18 @@ def recipename(pkg, d):
     """Return the recipe name for the given binary package name."""
 
     return pkgmap(d).get(pkg)
+
+def foreach_runtime_provider_pkgdata(d, rdep, include_rdep=False):
+    pkgdata_dir = d.getVar("PKGDATA_DIR")
+    possibles = set()
+    try:
+        possibles |= set(os.listdir("%s/runtime-rprovides/%s/" % (pkgdata_dir, rdep)))
+    except OSError:
+        pass
+
+    if include_rdep:
+        possibles.add(rdep)
+
+    for p in sorted(list(possibles)):
+        rdep_data = read_subpkgdata(p, d)
+        yield p, rdep_data