[PATCH RFC 2/3] package.bbclass: Generate runtime-rprovides data

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Currently, given a list of rdepends its near impossible to figure out
which ones are potentially invalid and which might be an RPROVIDES of a
package. 

This problem is simple to solve, we can write lookup data into the
pkgdata. This patch does that, accounting for the fact that multiple
packages can RPROVIDE the same thing (particularly with locales). Its
done with symlinks so the performance overhead is minimal.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/package.bbclass b/meta/classes/package.bbclass
index 988e148..7358376 100644
--- a/meta/classes/package.bbclass
+++ b/meta/classes/package.bbclass
@@ -1134,11 +1134,11 @@ python emit_pkgdata() {
         val = d.getVar('%s_%s' % (var, pkg), True)
         if val:
             f.write('%s_%s: %s\n' % (var, pkg, encode(val)))
-            return
+            return val
         val = d.getVar('%s' % (var), True)
         if val:
             f.write('%s: %s\n' % (var, encode(val)))
-        return
+        return val
 
     def write_extra_pkgs(variants, pn, packages, pkgdatadir):
         for variant in variants:
@@ -1207,7 +1207,7 @@ python emit_pkgdata() {
         write_if_exists(sf, pkg, 'DESCRIPTION')
         write_if_exists(sf, pkg, 'SUMMARY')
         write_if_exists(sf, pkg, 'RDEPENDS')
-        write_if_exists(sf, pkg, 'RPROVIDES')
+        rprov = write_if_exists(sf, pkg, 'RPROVIDES')
         write_if_exists(sf, pkg, 'RRECOMMENDS')
         write_if_exists(sf, pkg, 'RSUGGESTS')
         write_if_exists(sf, pkg, 'RREPLACES')
@@ -1235,6 +1235,13 @@ python emit_pkgdata() {
         # Symlinks needed for reverse lookups (from the final package name)
         subdata_sym = pkgdatadir + "/runtime-reverse/%s" % pkgval
         oe.path.symlink("../runtime/%s" % pkg, subdata_sym, True)
+        
+        # Symlinks needed for rprovides lookup
+        if rprov:
+            for p in rprov.strip().split():
+                subdata_sym = pkgdatadir + "/runtime-rprovides/%s/%s" % (p, pkg)
+                bb.utils.mkdirhier(os.path.dirname(subdata_sym))
+                oe.path.symlink("../../runtime/%s" % pkg, subdata_sym, True)
 
         allow_empty = d.getVar('ALLOW_EMPTY_%s' % pkg, True)
         if not allow_empty:
@@ -1254,7 +1261,7 @@ python emit_pkgdata() {
 
     bb.utils.unlockfile(lf)
 }
-emit_pkgdata[dirs] = "${PKGDESTWORK}/runtime ${PKGDESTWORK}/runtime-reverse"
+emit_pkgdata[dirs] = "${PKGDESTWORK}/runtime ${PKGDESTWORK}/runtime-reverse ${PKGDESTWORK}/runtime-rprovides"
 
 ldconfig_postinst_fragment() {
 if [ x"$D" = "x" ]; then