Add Tree parser with bolt

Also add Tree builder (Recipe) which can recompose trees.

pkg/tree/recipes_test.go

@@ -0,0 +1,125 @@
+// Recipe is a builder imeplementation.
+
+// It reads a Tree and spit it in human readable form (YAML), called recipe,
+// It also loads a tree (recipe) from a YAML (to a db, e.g. BoltDB), allowing to query it
+// with the solver, using the package object.
+package tree_test
+
+import (
+	"io/ioutil"
+	"os"
+
+	pkg "github.com/mudler/luet/pkg/package"
+	"github.com/mudler/luet/pkg/solver"
+	gentoo "github.com/mudler/luet/pkg/tree/builder/gentoo"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	. "github.com/mudler/luet/pkg/tree"
+)
+
+type FakeParser struct {
+}
+
+var _ = Describe("Recipe", func() {
+
+	Context("Tree generation and storing", func() {
+		It("parses and writes a tree", func() {
+			tmpdir, err := ioutil.TempDir("", "tree")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir) // clean up
+
+			gb := gentoo.NewGentooBuilder(&gentoo.SimpleEbuildParser{})
+			tree, err := gb.Generate("../../tests/fixtures/overlay")
+			Expect(err).ToNot(HaveOccurred())
+			defer func() {
+				Expect(tree.GetPackageSet().Clean()).ToNot(HaveOccurred())
+			}()
+
+			Expect(len(tree.GetPackageSet().GetPackages())).To(Equal(10))
+
+			generalRecipe := NewGeneralRecipe()
+			generalRecipe.WithTree(tree)
+			err = generalRecipe.Save(tmpdir)
+			Expect(err).ToNot(HaveOccurred())
+		})
+	})
+
+	Context("Reloading trees", func() {
+		It("writes and reads back the same tree", func() {
+			tmpdir, err := ioutil.TempDir("", "tree")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir) // clean up
+
+			gb := gentoo.NewGentooBuilder(&gentoo.SimpleEbuildParser{})
+			tree, err := gb.Generate("../../tests/fixtures/overlay")
+			Expect(err).ToNot(HaveOccurred())
+			defer func() {
+				Expect(tree.GetPackageSet().Clean()).ToNot(HaveOccurred())
+			}()
+
+			Expect(len(tree.GetPackageSet().GetPackages())).To(Equal(10))
+
+			generalRecipe := NewGeneralRecipe()
+			generalRecipe.WithTree(tree)
+			err = generalRecipe.Save(tmpdir)
+			Expect(err).ToNot(HaveOccurred())
+
+			generalRecipe.WithTree(nil)
+			Expect(generalRecipe.Tree()).To(BeNil())
+
+			err = generalRecipe.Load(tmpdir)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(generalRecipe.Tree()).ToNot(BeNil()) // It should be populated back at this point
+
+			Expect(len(generalRecipe.Tree().GetPackageSet().GetPackages())).To(Equal(10))
+
+			for _, pid := range tree.GetPackageSet().GetPackages() {
+				p, err := tree.GetPackageSet().GetPackage(pid)
+				Expect(err).ToNot(HaveOccurred())
+				Expect(p.GetName()).To(ContainSubstring("pinentry"))
+				Expect(p.GetVersion()).To(ContainSubstring("1."))
+			}
+		})
+	})
+
+	Context("Simple solving with the fixture tree", func() {
+		It("writes and reads back the same tree", func() {
+			tmpdir, err := ioutil.TempDir("", "tree")
+			Expect(err).ToNot(HaveOccurred())
+			defer os.RemoveAll(tmpdir) // clean up
+
+			gb := gentoo.NewGentooBuilder(&gentoo.SimpleEbuildParser{})
+			tree, err := gb.Generate("../../tests/fixtures/overlay")
+			Expect(err).ToNot(HaveOccurred())
+			defer func() {
+				Expect(tree.GetPackageSet().Clean()).ToNot(HaveOccurred())
+			}()
+
+			Expect(len(tree.GetPackageSet().GetPackages())).To(Equal(10))
+
+			pack, err := tree.FindPackage(&pkg.DefaultPackage{Name: "pinentry", Version: "1.0.0-r2"})
+			Expect(err).ToNot(HaveOccurred())
+			world, err := tree.World()
+			Expect(err).ToNot(HaveOccurred())
+
+			s := solver.NewSolver([]pkg.Package{}, world)
+			solution, err := s.Install([]pkg.Package{pack})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(len(solution)).To(Equal(3))
+
+			// for _, assertion := range solution {
+			// 	fmt.Println(assertion.Package, assertion.Value)
+
+			// 	for _, req := range assertion.Package.GetRequires() {
+			// 		fmt.Println("\t-> ", req)
+			// 	}
+
+			// 	for _, con := range assertion.Package.GetConflicts() {
+			// 		fmt.Println("\t!! ", con)
+			// 	}
+			// }
+
+		})
+	})
+})