Initial ecosystem implementation for Go.

pkg/runtime/ecosystem.go

@@ -21,6 +21,7 @@ func init() {
 		func() ecosystem { return &ecosys.JavaScript{} },
 		func() ecosystem { return &ecosys.Rust{} },
 		func() ecosystem { return &ecosys.DotNet{} },
+		func() ecosystem { return &ecosys.Golang{} },
 	}
 }
 

pkg/runtime/ecosystem/golang.go

@@ -0,0 +1,147 @@
+package ecosystem
+
+import (
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"golang.org/x/mod/semver"
+
+	"github.com/ActiveState/cli/internal/errs"
+	"github.com/ActiveState/cli/internal/fileutils"
+	"github.com/ActiveState/cli/internal/smartlink"
+	"github.com/ActiveState/cli/internal/unarchiver"
+	"github.com/ActiveState/cli/pkg/buildplan"
+)
+
+type Golang struct {
+	runtimeDir          string
+	proxyDir            string
+	addedModuleVersions map[string][]string
+}
+
+func (e *Golang) Init(runtimePath string, buildplan *buildplan.BuildPlan) error {
+	e.runtimeDir = runtimePath
+	e.proxyDir = filepath.Join("usr", "goproxy")
+	err := fileutils.MkdirUnlessExists(filepath.Join(e.runtimeDir, e.proxyDir))
+	if err != nil {
+		return errs.Wrap(err, "Unable to create Go proxy directory")
+	}
+	e.addedModuleVersions = make(map[string][]string)
+	return nil
+}
+
+func (e *Golang) Namespaces() []string {
+	return []string{"language/golang"}
+}
+
+// Unpack the module into the proxy directory.
+// We also inject the GOPROXY environment variable into runtime.json to force offline use.
+// We also inject GOMODCACHE to avoid polluting the default user cache.
+func (e *Golang) Add(artifact *buildplan.Artifact, artifactSrcPath string) ([]string, error) {
+	installedFiles := []string{}
+
+	files, err := fileutils.ListDir(artifactSrcPath, false)
+	if err != nil {
+		return nil, errs.Wrap(err, "Unable to read artifact source directory")
+	}
+
+	for _, file := range files {
+		if file.Name() == "runtime.json" {
+			err = injectEnvVar(file.AbsolutePath(), "GOPROXY", "file://${INSTALLDIR}/usr/goproxy")
+			if err != nil {
+				return nil, errs.Wrap(err, "Unable to add GOPROXY to runtime.json")
+			}
+			err = injectEnvVar(file.AbsolutePath(), "GOMODCACHE", "${INSTALLDIR}/usr/goproxy/cache")
+			if err != nil {
+				return nil, errs.Wrap(err, "Unable to add GOMODCACHE to runtime.json")
+			}
+			continue
+		}
+		if !strings.HasSuffix(file.Name(), ".zip") {
+			continue
+		}
+
+		// The structure of a Go proxy is:
+		// proxydir/
+		// - example.com/
+		//   - mymodule/
+		//     - @v/
+		//       - list
+		//	      - v1.0.0.mod
+		//	      - v1.0.0.zip
+
+		relativeProxied := filepath.Join(e.proxyDir, artifact.Name())
+		absProxied := filepath.Join(e.runtimeDir, relativeProxied)
+
+		// Create the @v directory if it doesn't already exist.
+		vDir := filepath.Join(absProxied, "@v")
+		err = fileutils.MkdirUnlessExists(vDir)
+		if err != nil {
+			return nil, errs.Wrap(err, "Could not create proxy module @v directory")
+		}
+
+		// Link/copy the zip file into the @v directory.
+		err = smartlink.Link(file.AbsolutePath(), filepath.Join(vDir, file.Name()))
+
+		// Extract the go.mod from the zip and copy it into the @v directory with a versioned name.
+		ua := unarchiver.NewZip()
+		unpackDir := fileutils.TempFilePath("", "")
+		f, size, err := ua.PrepareUnpacking(file.AbsolutePath(), unpackDir)
+		if err != nil {
+			return nil, errs.Wrap(err, "Unable to prepare for unpacking downloaded module")
+		}
+		err = ua.Unarchive(f, size, unpackDir)
+		if err != nil {
+			return nil, errs.Wrap(err, "Unable to unpack downloaded module")
+		}
+		err = fileutils.CopyFile(filepath.Join(unpackDir, artifact.NameAndVersion(), "go.mod"), filepath.Join(vDir, artifact.Version()+".mod"))
+		if err != nil {
+			return nil, errs.Wrap(err, "Unable to copy go.mod from unpacked module")
+		}
+		err = os.RemoveAll(unpackDir)
+		if err != nil {
+			return nil, errs.Wrap(err, "Unable to remove unpacked module")
+		}
+
+		installedFiles = append(installedFiles, relativeProxied)
+	}
+
+	e.addedModuleVersions[artifact.Name()] = append(e.addedModuleVersions[artifact.Name()], artifact.Version())
+
+	return installedFiles, nil
+}
+
+func (e *Golang) Remove(artifact *buildplan.Artifact) error {
+	return nil // TODO: CP-956
+}
+
+// Create/update each added module's version list file.
+func (e *Golang) Apply() error {
+	for name, versions := range e.addedModuleVersions {
+		listFile := filepath.Join(e.runtimeDir, e.proxyDir, name, "@v", "list")
+		if fileutils.FileExists(listFile) {
+			// Add known versions to the new versions so we can write a comprehensive list.
+			contents, err := fileutils.ReadFile(listFile)
+			if err != nil {
+				return errs.Wrap(err, "Unable to read %s", listFile)
+			}
+			for _, version := range strings.Split(string(contents), "\n") {
+				versions = append(versions, version)
+			}
+		}
+
+		// Sort versions in descending order by semver.
+		sort.SliceStable(versions, func(i, j int) bool {
+			return semver.Compare(versions[i], versions[j]) < 0
+		})
+
+		// Write all known versions.
+		err := fileutils.WriteFile(listFile, []byte(strings.Join(versions, "\n")))
+		if err != nil {
+			return errs.Wrap(err, "Unable to write %s", listFile)
+		}
+	}
+	return nil
+}