Revert "release/dist: run yarn build before building CLI"

This caused breakages on the build server:

synology/dsm7/x86_64: chdir /home/ubuntu/builds/2023-08-21T21-47-38Z-unstable-main-tagged-devices/0/client/web: no such file or directory
synology/dsm7/i686: chdir /home/ubuntu/builds/2023-08-21T21-47-38Z-unstable-main-tagged-devices/0/client/web: no such file or directory
synology/dsm7/armv8: chdir /home/ubuntu/builds/2023-08-21T21-47-38Z-unstable-main-tagged-devices/0/client/web: no such file or directory
...

Reverting while I investigate.

This reverts commit 0fb95ec07d.

Signed-off-by: Will Norris <will@tailscale.com>

release/dist/dist.go

@@ -43,8 +43,6 @@ type Build struct {
 	Tmp string
 	// Go is the path to the Go binary to use for building.
 	Go string
-	// Yarn is the path to the yarn binary to use for building the web client assets.
-	Yarn string
 	// Version is the version info of the build.
 	Version mkversion.VersionInfo
 	// Time is the timestamp of the build.
@@ -81,20 +79,15 @@ func NewBuild(repo, out string) (*Build, error) {
 	if err != nil {
 		return nil, fmt.Errorf("finding module root: %w", err)
 	}
-	goTool, err := findTool(repo, "go")
+	goTool, err := findGo(repo)
 	if err != nil {
 		return nil, fmt.Errorf("finding go binary: %w", err)
 	}
-	yarnTool, err := findTool(repo, "yarn")
-	if err != nil {
-		return nil, fmt.Errorf("finding yarn binary: %w", err)
-	}
 	b := &Build{
 		Repo:         repo,
 		Tmp:          tmp,
 		Out:          out,
 		Go:           goTool,
-		Yarn:         yarnTool,
 		Version:      mkversion.Info(),
 		Time:         time.Now().UTC(),
 		extra:        map[any]any{},
@@ -187,24 +180,6 @@ func (b *Build) TmpDir() string {
 	return ret
 }
 
-// BuildWebClientAssets builds the JS and CSS assets used by the web client.
-// Assets are built in the client/web/build directory and embedded in
-// the cmd/tailscale binary.
-func (b *Build) BuildWebClientAssets() error {
-	// Nothing in the web client assets is platform-specific,
-	// so we only need to build it once.
-	return b.Once("build-web-client-assets", func() error {
-		dir := filepath.Join(b.Repo, "client", "web")
-		if err := b.Command(dir, b.Yarn, "install").Run(); err != nil {
-			return err
-		}
-		if err := b.Command(dir, b.Yarn, "build").Run(); err != nil {
-			return err
-		}
-		return nil
-	})
-}
-
 // BuildGoBinary builds the Go binary at path and returns the path to the
 // binary. Builds are cached by path and env, so each build only happens once
 // per process execution.
@@ -328,19 +303,16 @@ func findModRoot(path string) (string, error) {
 	}
 }
 
-// findTool returns the path to the specified named tool.
-// It first looks in the "tool" directory in the provided path,
-// then in the $PATH environment variable.
-func findTool(path, name string) (string, error) {
-	tool := filepath.Join(path, "tool", name)
-	if _, err := os.Stat(tool); err == nil {
-		return tool, nil
+func findGo(path string) (string, error) {
+	toolGo := filepath.Join(path, "tool/go")
+	if _, err := os.Stat(toolGo); err == nil {
+		return toolGo, nil
 	}
-	tool, err := exec.LookPath(name)
+	toolGo, err := exec.LookPath("go")
 	if err != nil {
 		return "", err
 	}
-	return tool, nil
+	return toolGo, nil
 }
 
 // FilterTargets returns the subset of targets that match any of the filters.

release/dist/synology/pkgs.go

@@ -144,9 +144,6 @@ func getSynologyBuilds(b *dist.Build) *synologyBuilds {
 func (m *synologyBuilds) buildInnerPackage(b *dist.Build, dsmVersion int, goenv map[string]string) (*innerPkg, error) {
 	key := []any{dsmVersion, goenv}
 	return m.innerPkgs.Do(key, func() (*innerPkg, error) {
-		if err := b.BuildWebClientAssets(); err != nil {
-			return nil, err
-		}
 		ts, err := b.BuildGoBinary("tailscale.com/cmd/tailscale", goenv)
 		if err != nil {
 			return nil, err

release/dist/unixpkgs/pkgs.go

@@ -53,9 +53,6 @@ func (t *tgzTarget) Build(b *dist.Build) ([]string, error) {
 	} else {
 		filename = fmt.Sprintf("tailscale_%s_%s_%s.tgz", b.Version.Short, t.os(), t.arch())
 	}
-	if err := b.BuildWebClientAssets(); err != nil {
-		return nil, err
-	}
 	ts, err := b.BuildGoBinary("tailscale.com/cmd/tailscale", t.goEnv)
 	if err != nil {
 		return nil, err
@@ -196,9 +193,6 @@ func (t *debTarget) Build(b *dist.Build) ([]string, error) {
 		return nil, errors.New("deb only supported on linux")
 	}
 
-	if err := b.BuildWebClientAssets(); err != nil {
-		return nil, err
-	}
 	ts, err := b.BuildGoBinary("tailscale.com/cmd/tailscale", t.goEnv)
 	if err != nil {
 		return nil, err
@@ -311,9 +305,6 @@ func (t *rpmTarget) Build(b *dist.Build) ([]string, error) {
 		return nil, errors.New("rpm only supported on linux")
 	}
 
-	if err := b.BuildWebClientAssets(); err != nil {
-		return nil, err
-	}
 	ts, err := b.BuildGoBinary("tailscale.com/cmd/tailscale", t.goEnv)
 	if err != nil {
 		return nil, err

tool/yarn

@@ -21,7 +21,7 @@ fi
     cachedir="$HOME/.cache/tailscale-yarn"
     tarball="${cachedir}.tar.gz"
 
-    read -r want_rev < "./tool/yarn.rev"
+    read -r want_rev < "$(dirname "$0")/yarn.rev"
 
     got_rev=""
     if [[ -x "${cachedir}/bin/yarn" ]]; then