feat: add b binary (selfupdate) (#10)

README.md

@@ -110,6 +110,7 @@ Have a look into [pkg/binary](./pkg/binary/) for more details.
 Have a look into [pkg/binaries](./pkg/binaries/) for prepackaged binaries.
 
 - [argsh](https://github.com/arg-sh/argsh) - Utilities for Bash script quality
+- `b` - (Selfupdate) Manage and execute binary files
 - [docker-compose](https://github.com/docker/compose) - Define and run multi-container Docker applications
 - [gh](https://github.com/cli/cli) - GitHub CLI wrapper
 - [hcloud](https://github.com/hetznercloud/cli) - Hetzner Cloud CLI wrapper

cmd/b/main.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/buyoio/b/pkg/binaries"
 	"github.com/buyoio/b/pkg/binaries/argsh"
+	"github.com/buyoio/b/pkg/binaries/b"
 	compose "github.com/buyoio/b/pkg/binaries/docker-compose"
 	"github.com/buyoio/b/pkg/binaries/gh"
 	"github.com/buyoio/b/pkg/binaries/hcloud"
@@ -26,8 +27,8 @@ import (
 
 // Magic variables set by goreleaser
 var (
-	version           = "1.0.0" // x-release-please-version
-	versionPreRelease = "dev"
+	version           = "v1.0.0" // x-release-please-version
+	versionPreRelease = ""
 )
 
 func main() {
@@ -37,6 +38,7 @@ func main() {
 	root := cli.NewCmdBinary(&cli.CmdBinaryOptions{
 		Binaries: []*binary.Binary{
 			argsh.Binary(o),
+			b.Binary(o),
 			compose.Binary(o),
 			gh.Binary(o),
 			hcloud.Binary(o),

pkg/binaries/b/b.go

@@ -0,0 +1,33 @@
+package b
+
+import (
+	"context"
+	"fmt"
+	"runtime"
+
+	"github.com/buyoio/b/pkg/binaries"
+	"github.com/buyoio/b/pkg/binary"
+)
+
+func Binary(options *binaries.BinaryOptions) *binary.Binary {
+	if options == nil {
+		options = &binaries.BinaryOptions{
+			Context: context.Background(),
+		}
+	}
+	// https://github.com/buyoio/b/releases/download/v1.0.0/b-linux-amd64.tar.gz
+	return &binary.Binary{
+		Context:    options.Context,
+		Envs:       options.Envs,
+		Tracker:    options.Tracker,
+		Version:    options.Version,
+		Name:       "b",
+		GitHubRepo: "buyoio/b",
+		GitHubFile: fmt.Sprintf("b-%s-%s.tar.gz", runtime.GOOS, runtime.GOARCH),
+		VersionF:   binary.GithubLatest,
+		IsTarGz:    true,
+		VersionLocalF: func(b *binary.Binary) (string, error) {
+			return b.Exec("--version")
+		},
+	}
+}

pkg/binary/binary.go

@@ -112,5 +112,22 @@ func (b *Binary) DownloadBinary() error {
 	if err != nil {
 		return err
 	}
-	return b.downloadBinary()
+	path := b.BinaryPath()
+	if ex, err := os.Executable(); err != nil || ex != path {
+		return b.downloadBinary()
+	}
+	// Self update
+	old := path + ".old"
+	err = os.Rename(path, old)
+	if err != nil {
+		return err
+	}
+	defer os.Remove(old)
+
+	err = b.downloadBinary()
+	if err != nil {
+		// Rollback
+		_ = os.Rename(old, path)
+	}
+	return err
 }