Merge pull request #229 from paketo-buildpacks/add-static

Add static stack as well as convenience methods for matching stacks

init_test.go

@@ -33,5 +33,6 @@ func TestUnit(t *testing.T) {
 	suite("Formatter", testFormatter)
 	suite("Layer", testLayer)
 	suite("Main", testMain)
+	suite("Stack", testStack)
 	suite.Run(t)
 }

stack.go

@@ -33,4 +33,32 @@ const (
 
 	// JammyTinyStackID is the ID for the Cloud Native Buildpacks jammy tiny stack.
 	JammyTinyStackID = "io.buildpacks.stacks.jammy.tiny"
+
+	// JammyStaticStackID is the ID for the Cloud Native Buildpacks jammy static stack.
+	JammyStaticStackID = "io.buildpacks.stacks.jammy.static"
 )
+
+// IsBionicStack returns true if the stack is one of the bionic variants
+func IsBionicStack(stack string) bool {
+	return BionicStackID == stack || BionicTinyStackID == stack || TinyStackID == stack
+}
+
+// IsJammyStack returns true if the stack is one of the jammy variants
+func IsJammyStack(stack string) bool {
+	return JammyStackID == stack || JammyTinyStackID == stack || JammyStaticStackID == stack
+}
+
+// IsTinyStack returns true if the stack is one of the tiny variants
+func IsTinyStack(stack string) bool {
+	return BionicTinyStackID == stack || JammyTinyStackID == stack || TinyStackID == stack
+}
+
+// IsStaticStack returns true if the stack is one of the static variants
+func IsStaticStack(stack string) bool {
+	return JammyStaticStackID == stack
+}
+
+// IsShellPresentOnStack returns true if the stack is known to have a shell
+func IsShellPresentOnStack(stack string) bool {
+	return BionicStackID == stack || JammyStackID == stack
+}

stack_test.go

@@ -0,0 +1,77 @@
+package libpak_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/gomega"
+	"github.com/paketo-buildpacks/libpak"
+	"github.com/sclevine/spec"
+)
+
+func testStack(t *testing.T, context spec.G, it spec.S) {
+	context("bionic stacks", func() {
+		it("matches standard bionic stack", func() {
+			Expect(libpak.IsBionicStack("io.buildpacks.stacks.bionic")).To(BeTrue())
+		})
+
+		it("matches tiny bionic stack", func() {
+			Expect(libpak.IsBionicStack("io.paketo.stacks.tiny")).To(BeTrue())
+		})
+
+		it("does not match non-bionic stack", func() {
+			Expect(libpak.IsBionicStack("io.buildpacks.stacks.jammy")).To(BeFalse())
+		})
+	})
+
+	context("jammy stacks", func() {
+		it("matches standard jammy stack", func() {
+			Expect(libpak.IsJammyStack("io.buildpacks.stacks.jammy")).To(BeTrue())
+		})
+
+		it("matches tiny jammy stack", func() {
+			Expect(libpak.IsJammyStack("io.buildpacks.stacks.jammy.tiny")).To(BeTrue())
+		})
+
+		it("matches static jammy stack", func() {
+			Expect(libpak.IsJammyStack("io.buildpacks.stacks.jammy.static")).To(BeTrue())
+		})
+
+		it("does not match non-jammy stack", func() {
+			Expect(libpak.IsJammyStack("io.buildpacks.stacks.bionic")).To(BeFalse())
+		})
+	})
+
+	context("tiny stacks", func() {
+		it("matches tiny bionic stack", func() {
+			Expect(libpak.IsTinyStack("io.paketo.stacks.tiny")).To(BeTrue())
+		})
+
+		it("matches tiny jammy stack", func() {
+			Expect(libpak.IsTinyStack("io.buildpacks.stacks.jammy.tiny")).To(BeTrue())
+		})
+
+		it("does not match full stack", func() {
+			Expect(libpak.IsTinyStack("io.buildpacks.stacks.bionic")).To(BeFalse())
+		})
+	})
+
+	context("static stack", func() {
+		it("matches static jammy stack", func() {
+			Expect(libpak.IsStaticStack("io.buildpacks.stacks.jammy.static")).To(BeTrue())
+		})
+
+		it("does not match full stack", func() {
+			Expect(libpak.IsTinyStack("io.buildpacks.stacks.bionic")).To(BeFalse())
+		})
+	})
+
+	context("shell", func() {
+		it("matches a full stack", func() {
+			Expect(libpak.IsShellPresentOnStack("io.buildpacks.stacks.bionic")).To(BeTrue())
+		})
+
+		it("does not match static jammy stack", func() {
+			Expect(libpak.IsShellPresentOnStack("io.buildpacks.stacks.jammy.static")).To(BeFalse())
+		})
+	})
+}