product: Add packer (#272)

build/git_revision_test.go

@@ -127,6 +127,35 @@ func TestGitRevision_vault(t *testing.T) {
 	}
 }
 
+func TestGitRevision_packer(t *testing.T) {
+	testutil.EndToEndTest(t)
+
+	gr := &GitRevision{Product: product.Packer}
+	gr.SetLogger(testutil.TestLogger())
+
+	ctx := context.Background()
+
+	execPath, err := gr.Build(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { gr.Remove(ctx) })
+
+	v, err := product.Packer.GetVersion(ctx, execPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	latestConstraint, err := version.NewConstraint(">= 1.0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !latestConstraint.Check(v.Core()) {
+		t.Fatalf("versions don't match (expected: %s, installed: %s)",
+			latestConstraint, v)
+	}
+}
+
 func TestGitRevisionValidate(t *testing.T) {
 	t.Parallel()
 

product/packer.go

@@ -0,0 +1,54 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package product
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"strings"
+
+	"github.com/hashicorp/go-version"
+	"github.com/hashicorp/hc-install/internal/build"
+)
+
+var packerVersionOutputRe = regexp.MustCompile(`Packer ` + simpleVersionRe)
+
+var Packer = Product{
+	Name: "packer",
+	BinaryName: func() string {
+		if runtime.GOOS == "windows" {
+			return "packer.exe"
+		}
+		return "packer"
+	},
+	GetVersion: func(ctx context.Context, path string) (*version.Version, error) {
+		cmd := exec.CommandContext(ctx, path, "version")
+
+		out, err := cmd.Output()
+		if err != nil {
+			return nil, err
+		}
+
+		stdout := strings.TrimSpace(string(out))
+
+		submatches := packerVersionOutputRe.FindStringSubmatch(stdout)
+		if len(submatches) != 2 {
+			return nil, fmt.Errorf("unexpected number of version matches %d for %s", len(submatches), stdout)
+		}
+		v, err := version.NewVersion(submatches[1])
+		if err != nil {
+			return nil, fmt.Errorf("unable to parse version %q: %w", submatches[1], err)
+		}
+
+		return v, err
+	},
+	BuildInstructions: &BuildInstructions{
+		GitRepoURL:    "https://github.com/hashicorp/packer.git",
+		PreCloneCheck: &build.GoIsInstalled{},
+		Build:         &build.GoBuild{DetectVendoring: true},
+	},
+}

product/product.go

@@ -10,6 +10,8 @@ import (
 	"github.com/hashicorp/go-version"
 )
 
+const simpleVersionRe = `v?(?P<version>[0-9]+(?:\.[0-9]+)*(?:-[A-Za-z0-9\.]+)?)`
+
 type Product struct {
 	// Name which identifies the product
 	// on releases.hashicorp.com and in Checkpoint

product/terraform.go

@@ -15,11 +15,7 @@ import (
 	"github.com/hashicorp/hc-install/internal/build"
 )
 
-var (
-	simpleVersionRe = `v?(?P<version>[0-9]+(?:\.[0-9]+)*(?:-[A-Za-z0-9\.]+)?)`
-
-	terraformVersionOutputRe = regexp.MustCompile(`Terraform ` + simpleVersionRe)
-)
+var terraformVersionOutputRe = regexp.MustCompile(`Terraform ` + simpleVersionRe)
 
 var Terraform = Product{
 	Name: "terraform",