Add compiler interfaces and build definition skeleton

Create compiler interface with switchable backends. For now it can resolve and
parse a `build.yaml` which is in the same folder as in `definition.yaml`

Add also tests to cover this and new fixtures

pkg/compiler/artifact.go

@@ -0,0 +1,18 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler
+
+type Artifact struct{}

pkg/compiler/compiler.go

@@ -0,0 +1,58 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler
+
+import (
+	"errors"
+	"io/ioutil"
+
+	"github.com/mudler/luet/pkg/helpers"
+	pkg "github.com/mudler/luet/pkg/package"
+	"github.com/mudler/luet/pkg/tree"
+)
+
+const BuildFile = "build.yaml"
+
+type LuetCompiler struct {
+	*tree.Recipe
+	Backend CompilerBackend
+}
+
+func NewLuetCompiler(backend CompilerBackend, t pkg.Tree) Compiler {
+	return &LuetCompiler{Backend: backend, Recipe: &tree.Recipe{PackageTree: t}}
+}
+
+func (cs *LuetCompiler) Compile(p CompilationSpec) (*Artifact, error) {
+	return nil, errors.New("Not implemented yet")
+}
+
+func (cs *LuetCompiler) FromPackage(p pkg.Package) (CompilationSpec, error) {
+
+	pack, err := cs.Tree().GetPackageSet().FindPackage(p)
+	if err != nil {
+		return nil, err
+	}
+	buildFile := pack.Rel(BuildFile)
+	if !helpers.Exists(buildFile) {
+		return nil, errors.New("No build file present for " + p.GetFingerPrint())
+	}
+
+	dat, err := ioutil.ReadFile(buildFile)
+	if err != nil {
+		return nil, err
+	}
+	return NewLuetCompilationSpec(dat)
+}

pkg/compiler/compiler_suite_test.go

@@ -0,0 +1,28 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestSolver(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Compiler Suite")
+}

pkg/compiler/interface.go

@@ -0,0 +1,33 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler
+
+import pkg "github.com/mudler/luet/pkg/package"
+
+type Compiler interface {
+	Compile(CompilationSpec) (*Artifact, error)
+	FromPackage(pkg.Package) (CompilationSpec, error)
+}
+
+type CompilerBackend interface {
+	Tree() pkg.Tree
+	WithTree(pkg.Tree)
+}
+
+// CompilationSpec represent a compilation specification derived from a package
+type CompilationSpec interface {
+	ToDocker() (string, error)
+}

pkg/compiler/spec.go

@@ -0,0 +1,38 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler
+
+import (
+	yaml "gopkg.in/yaml.v2"
+)
+
+type LuetCompilationSpec struct {
+	Steps []string `json:"steps"`
+	Image string   `json:"image"`
+}
+
+func NewLuetCompilationSpec(b []byte) (CompilationSpec, error) {
+	var spec LuetCompilationSpec
+	err := yaml.Unmarshal(b, &spec)
+	if err != nil {
+		return &spec, err
+	}
+	return &spec, nil
+}
+
+func (cs *LuetCompilationSpec) ToDocker() (string, error) {
+	return "", nil
+}

pkg/compiler/spec_test.go

@@ -0,0 +1,49 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package compiler_test
+
+import (
+	. "github.com/mudler/luet/pkg/compiler"
+	pkg "github.com/mudler/luet/pkg/package"
+	"github.com/mudler/luet/pkg/tree"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Spec", func() {
+	Context("Simple package build definition", func() {
+		It("Loads it correctly", func() {
+			generalRecipe := tree.NewGeneralRecipe()
+
+			err := generalRecipe.Load("../../tests/fixtures/buildtree")
+			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(1))
+
+			compiler := NewLuetCompiler(nil, generalRecipe.Tree())
+			spec, err := compiler.FromPackage(&pkg.DefaultPackage{Name: "enman", Category: "app-admin", Version: "1.4.0"})
+			Expect(err).ToNot(HaveOccurred())
+
+			lspec, ok := spec.(*LuetCompilationSpec)
+			Expect(ok).To(BeTrue())
+
+			Expect(lspec.Steps).To(Equal([]string{"echo foo", "bar"}))
+			Expect(lspec.Image).To(Equal("luet/base"))
+		})
+
+	})
+})

pkg/helpers/file.go

@@ -0,0 +1,28 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package helpers
+
+import "os"
+
+// Exists reports whether the named file or directory exists.
+func Exists(name string) bool {
+	if _, err := os.Stat(name); err != nil {
+		if os.IsNotExist(err) {
+			return false
+		}
+	}
+	return true
+}

tests/fixtures/buildtree/app-admin/enman/1.4.0/build.yaml

@@ -0,0 +1,4 @@
+image: "luet/base"
+steps:
+  - echo foo
+  - bar

tests/fixtures/buildtree/app-admin/enman/1.4.0/definition.yaml

@@ -0,0 +1,8 @@
+State: ""
+category: app-admin
+conflicts: null
+name: enman
+requires: null
+set: false
+use_flags: null
+version: 1.4.0