add tidy command

src/cmd/get/tidy/tidy.go

@@ -0,0 +1,66 @@
+package tidy
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	yey "github.com/silphid/yey/src/internal"
+	"github.com/silphid/yey/src/internal/docker"
+)
+
+// New creates a cobra command
+func New() *cobra.Command {
+	return &cobra.Command{
+		Use:   "tidy",
+		Short: "Removes unreferenced containers",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return run(cmd.Context())
+		},
+	}
+}
+
+func run(ctx context.Context) error {
+	contexts, err := yey.LoadContexts()
+	if err != nil {
+		return err
+	}
+
+	validNames := make(map[string]struct{})
+	for _, name := range contexts.GetNames() {
+		ctx, err := contexts.GetContext(name)
+		if err != nil {
+			return err
+		}
+		validNames[yey.ContainerName(contexts.Path, ctx)] = struct{}{}
+	}
+
+	prefix := fmt.Sprintf(
+		"yey-%s-%s",
+		filepath.Base(filepath.Dir(contexts.Path)),
+		yey.Hash(contexts.Path),
+	)
+
+	names, err := docker.ListContainers(ctx)
+	if err != nil {
+		return err
+	}
+
+	for _, container := range names {
+		if !strings.HasPrefix(container, prefix) {
+			continue
+		}
+		if _, ok := validNames[container]; ok {
+			continue
+		}
+		if err := docker.Remove(ctx, container); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

src/internal/context_test.go

@@ -84,32 +84,32 @@ func TestMerge(t *testing.T) {
 
 func TestSameHashesForSameContexts(t *testing.T) {
 	ctx1 := getCtx1()
-	hash1 := hash(ctx1.String())
+	hash1 := Hash(ctx1.String())
 
 	ctx2 := getCtx1()
-	hash2 := hash(ctx2.String())
+	hash2 := Hash(ctx2.String())
 
 	assert.Equal(t, hash1, hash2)
 }
 
 func TestDifferentHashesForDifferentEnvs(t *testing.T) {
 	ctx1 := getCtx1()
-	hash1 := hash(ctx1.String())
+	hash1 := Hash(ctx1.String())
 
 	ctx2 := getCtx1()
 	ctx2.Env["ENV1"] = "value1b"
-	hash2 := hash(ctx2.String())
+	hash2 := Hash(ctx2.String())
 
 	assert.NotEqual(t, hash1, hash2)
 }
 
 func TestDifferentHashesForDifferentMounts(t *testing.T) {
 	ctx1 := getCtx1()
-	hash1 := hash(ctx1.String())
+	hash1 := Hash(ctx1.String())
 
 	ctx2 := getCtx1()
 	ctx2.Mounts["/local/mount1"] = "/container/mount1b"
-	hash2 := hash(ctx2.String())
+	hash2 := Hash(ctx2.String())
 
 	assert.NotEqual(t, hash1, hash2)
 }

src/internal/yey.go

@@ -8,7 +8,7 @@ import (
 	"path/filepath"
 )
 
-func hash(value string) string {
+func Hash(value string) string {
 	hasher := crc64.New(crc64.MakeTable(crc64.ECMA))
 	io.WriteString(hasher, value)
 	return hex.EncodeToString(hasher.Sum(nil))
@@ -18,8 +18,8 @@ func ContainerName(path string, context Context) string {
 	return fmt.Sprintf(
 		"yey-%s-%s-%s-%s",
 		filepath.Base(filepath.Dir(path)),
-		hash(path),
+		Hash(path),
 		context.Name,
-		hash(context.String()),
+		Hash(context.String()),
 	)
 }

src/main.go

@@ -12,6 +12,7 @@ import (
 	getcontainers "github.com/silphid/yey/src/cmd/get/containers"
 	getcontext "github.com/silphid/yey/src/cmd/get/context"
 	getcontexts "github.com/silphid/yey/src/cmd/get/contexts"
+	"github.com/silphid/yey/src/cmd/get/tidy"
 
 	"github.com/silphid/yey/src/cmd/run"
 	"github.com/silphid/yey/src/cmd/versioning"
@@ -31,6 +32,7 @@ func main() {
 	rootCmd := cmd.NewRoot()
 	rootCmd.AddCommand(run.New())
 	rootCmd.AddCommand(versioning.New(version))
+	rootCmd.AddCommand(tidy.New())
 
 	getCmd := get.New()
 	getCmd.AddCommand(getcontext.New())