Bug fix for `ResolveCompetingPackages` when building on RPM-based distro.

The current implementation of `ResolveCompetingPackages` assumes it is running on a
distro that doesn't use RPM. Specifically, it doesn't set the root directory which
allows for confusion between the packages being built for CBL-Mariner and the packages
installed on the build system. This change fix this problem by setting the root
directory when calling the `rpm` command.

toolkit/tools/graphpkgfetcher/graphpkgfetcher.go

@@ -242,7 +242,7 @@ func assignRPMPath(node *pkggraph.PkgNode, outDir string, resolvedPackages []str
 		var resolvedRPMs []string
 		logger.Log.Debugf("Found %d candidates. Resolving.", len(rpmPaths))
 
-		resolvedRPMs, err = rpm.ResolveCompetingPackages(rpmPaths...)
+		resolvedRPMs, err = rpm.ResolveCompetingPackages(*tmpDir, rpmPaths...)
 		if err != nil {
 			logger.Log.Errorf("Failed while trying to pick an RPM providing '%s' from the following RPMs: %v", node.VersionedPkg.Name, rpmPaths)
 			return

toolkit/tools/internal/rpm/rpm.go

@@ -280,7 +280,7 @@ func QueryRPMProvides(rpmFile string) (provides []string, err error) {
 
 // ResolveCompetingPackages takes in a list of RPMs and returns only the ones, which would
 // end up being installed after resolving outdated, obsoleted, or conflicting packages.
-func ResolveCompetingPackages(rpmPaths ...string) (resolvedRPMs []string, err error) {
+func ResolveCompetingPackages(rootDir string, rpmPaths ...string) (resolvedRPMs []string, err error) {
 	const (
 		queryFormat       = ""
 		installedRPMIndex = 1
@@ -290,6 +290,8 @@ func ResolveCompetingPackages(rpmPaths ...string) (resolvedRPMs []string, err er
 	args := []string{
 		"-Uvvh",
 		"--nodeps",
+		"--root",
+		rootDir,
 		"--test",
 	}
 	args = append(args, rpmPaths...)