forked from cerc-io/plugeth
build: improve cross compilation setup (#22804)
This PR cleans up the CI build system and fixes a couple of issues. - The go tool launcher code has been moved to internal/build. With the new toolchain functions, the environment of the host Go (i.e. the one that built ci.go) and the target Go (i.e. the toolchain downloaded by -dlgo) are isolated more strictly. This is important to make cross compilation and -dlgo work correctly in more cases. - The -dlgo option now skips the download and uses the host Go if the running Go version matches dlgoVersion exactly. - The 'test' command now supports -dlgo, -cc and -arch. Running unit tests with foreign GOARCH is occasionally useful. For example, it can be used to run 32-bit tests on Windows. It can also be used to run darwin/amd64 tests on darwin/arm64 using Rosetta 2. - The 'aar', 'xcode' and 'xgo' commands now use a slightly different method to install external tools. They previously used `go get`, but this comes with the annoying side effect of modifying go.mod. They now use `go install` instead, which is the recommended way of installing tools without modifying the local module. - The old build warning about outdated Go version has been removed because we're much better at keeping backwards compatibility now.
This commit is contained in:
Felix Lange
GitHub
parent
b8040a430e
commit
effaf18523
9
Makefile
9
Makefile
@ -46,12 +46,11 @@ clean:
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# You need to put $GOBIN (or $GOPATH/bin) in your PATH to use 'go generate'.
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devtools:
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env GOBIN= go get -u golang.org/x/tools/cmd/stringer
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env GOBIN= go get -u github.com/kevinburke/go-bindata/go-bindata
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env GOBIN= go get -u github.com/fjl/gencodec
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env GOBIN= go get -u github.com/golang/protobuf/protoc-gen-go
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env GOBIN= go install golang.org/x/tools/cmd/stringer@latest
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env GOBIN= go install github.com/kevinburke/go-bindata/go-bindata@latest
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env GOBIN= go install github.com/fjl/gencodec@latest
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env GOBIN= go install github.com/golang/protobuf/protoc-gen-go@latest
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env GOBIN= go install ./cmd/abigen
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@type "npm" 2> /dev/null || echo 'Please install node.js and npm'
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@type "solc" 2> /dev/null || echo 'Please install solc'
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@type "protoc" 2> /dev/null || echo 'Please install protoc'
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208
build/ci.go
208
build/ci.go
@ -208,58 +208,25 @@ func doInstall(cmdline []string) {
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cc = flag.String("cc", "", "C compiler to cross build with")
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)
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flag.CommandLine.Parse(cmdline)
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// Configure the toolchain.
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tc := build.GoToolchain{GOARCH: *arch, CC: *cc}
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if *dlgo {
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csdb := build.MustLoadChecksums("build/checksums.txt")
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tc.Root = build.DownloadGo(csdb, dlgoVersion)
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}
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// Configure the build.
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env := build.Env()
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// Check local Go version. People regularly open issues about compilation
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// failure with outdated Go. This should save them the trouble.
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if !strings.Contains(runtime.Version(), "devel") {
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// Figure out the minor version number since we can't textually compare (1.10 < 1.9)
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var minor int
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fmt.Sscanf(strings.TrimPrefix(runtime.Version(), "go1."), "%d", &minor)
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if minor < 13 {
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log.Println("You have Go version", runtime.Version())
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log.Println("go-ethereum requires at least Go version 1.13 and cannot")
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log.Println("be compiled with an earlier version. Please upgrade your Go installation.")
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os.Exit(1)
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}
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}
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// Choose which go command we're going to use.
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var gobuild *exec.Cmd
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if !*dlgo {
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// Default behavior: use the go version which runs ci.go right now.
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gobuild = goTool("build")
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} else {
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// Download of Go requested. This is for build environments where the
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// installed version is too old and cannot be upgraded easily.
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cachedir := filepath.Join("build", "cache")
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goroot := downloadGo(runtime.GOARCH, runtime.GOOS, cachedir)
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gobuild = localGoTool(goroot, "build")
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}
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// Configure environment for cross build.
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if *arch != "" || *arch != runtime.GOARCH {
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gobuild.Env = append(gobuild.Env, "CGO_ENABLED=1")
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gobuild.Env = append(gobuild.Env, "GOARCH="+*arch)
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}
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// Configure C compiler.
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if *cc != "" {
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gobuild.Env = append(gobuild.Env, "CC="+*cc)
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} else if os.Getenv("CC") != "" {
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gobuild.Env = append(gobuild.Env, "CC="+os.Getenv("CC"))
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}
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gobuild := tc.Go("build", buildFlags(env)...)
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// arm64 CI builders are memory-constrained and can't handle concurrent builds,
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// better disable it. This check isn't the best, it should probably
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// check for something in env instead.
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if runtime.GOARCH == "arm64" {
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if env.CI && runtime.GOARCH == "arm64" {
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gobuild.Args = append(gobuild.Args, "-p", "1")
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}
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// Put the default settings in.
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gobuild.Args = append(gobuild.Args, buildFlags(env)...)
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// We use -trimpath to avoid leaking local paths into the built executables.
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gobuild.Args = append(gobuild.Args, "-trimpath")
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@ -301,53 +268,30 @@ func buildFlags(env build.Environment) (flags []string) {
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return flags
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}
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// goTool returns the go tool. This uses the Go version which runs ci.go.
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func goTool(subcmd string, args ...string) *exec.Cmd {
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cmd := build.GoTool(subcmd, args...)
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goToolSetEnv(cmd)
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return cmd
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}
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// localGoTool returns the go tool from the given GOROOT.
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func localGoTool(goroot string, subcmd string, args ...string) *exec.Cmd {
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gotool := filepath.Join(goroot, "bin", "go")
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cmd := exec.Command(gotool, subcmd)
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goToolSetEnv(cmd)
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cmd.Env = append(cmd.Env, "GOROOT="+goroot)
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cmd.Args = append(cmd.Args, args...)
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return cmd
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}
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// goToolSetEnv forwards the build environment to the go tool.
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func goToolSetEnv(cmd *exec.Cmd) {
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cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
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for _, e := range os.Environ() {
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if strings.HasPrefix(e, "GOBIN=") || strings.HasPrefix(e, "CC=") {
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continue
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}
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cmd.Env = append(cmd.Env, e)
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}
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}
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// Running The Tests
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//
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// "tests" also includes static analysis tools such as vet.
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func doTest(cmdline []string) {
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coverage := flag.Bool("coverage", false, "Whether to record code coverage")
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verbose := flag.Bool("v", false, "Whether to log verbosely")
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var (
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dlgo = flag.Bool("dlgo", false, "Download Go and build with it")
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arch = flag.String("arch", "", "Run tests for given architecture")
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cc = flag.String("cc", "", "Sets C compiler binary")
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coverage = flag.Bool("coverage", false, "Whether to record code coverage")
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verbose = flag.Bool("v", false, "Whether to log verbosely")
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)
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flag.CommandLine.Parse(cmdline)
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env := build.Env()
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packages := []string{"./..."}
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if len(flag.CommandLine.Args()) > 0 {
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packages = flag.CommandLine.Args()
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// Configure the toolchain.
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tc := build.GoToolchain{GOARCH: *arch, CC: *cc}
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if *dlgo {
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csdb := build.MustLoadChecksums("build/checksums.txt")
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tc.Root = build.DownloadGo(csdb, dlgoVersion)
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}
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gotest := tc.Go("test")
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// Run the actual tests.
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// Test a single package at a time. CI builders are slow
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// and some tests run into timeouts under load.
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gotest := goTool("test", buildFlags(env)...)
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gotest.Args = append(gotest.Args, "-p", "1")
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if *coverage {
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gotest.Args = append(gotest.Args, "-covermode=atomic", "-cover")
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@ -356,6 +300,10 @@ func doTest(cmdline []string) {
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gotest.Args = append(gotest.Args, "-v")
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}
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packages := []string{"./..."}
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if len(flag.CommandLine.Args()) > 0 {
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packages = flag.CommandLine.Args()
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}
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gotest.Args = append(gotest.Args, packages...)
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build.MustRun(gotest)
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}
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@ -416,7 +364,6 @@ func doArchive(cmdline []string) {
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var (
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env = build.Env()
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basegeth = archiveBasename(*arch, params.ArchiveVersion(env.Commit))
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geth = "geth-" + basegeth + ext
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alltools = "geth-alltools-" + basegeth + ext
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@ -492,15 +439,15 @@ func archiveUpload(archive string, blobstore string, signer string, signifyVar s
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// skips archiving for some build configurations.
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func maybeSkipArchive(env build.Environment) {
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if env.IsPullRequest {
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log.Printf("skipping because this is a PR build")
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log.Printf("skipping archive creation because this is a PR build")
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os.Exit(0)
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}
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if env.IsCronJob {
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log.Printf("skipping because this is a cron job")
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log.Printf("skipping archive creation because this is a cron job")
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os.Exit(0)
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}
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if env.Branch != "master" && !strings.HasPrefix(env.Tag, "v1.") {
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log.Printf("skipping because branch %q, tag %q is not on the whitelist", env.Branch, env.Tag)
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log.Printf("skipping archive creation because branch %q, tag %q is not on the whitelist", env.Branch, env.Tag)
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os.Exit(0)
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}
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}
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@ -518,6 +465,7 @@ func doDebianSource(cmdline []string) {
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flag.CommandLine.Parse(cmdline)
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*workdir = makeWorkdir(*workdir)
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env := build.Env()
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tc := new(build.GoToolchain)
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maybeSkipArchive(env)
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// Import the signing key.
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@ -531,12 +479,12 @@ func doDebianSource(cmdline []string) {
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gobundle := downloadGoSources(*cachedir)
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// Download all the dependencies needed to build the sources and run the ci script
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srcdepfetch := goTool("mod", "download")
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srcdepfetch.Env = append(os.Environ(), "GOPATH="+filepath.Join(*workdir, "modgopath"))
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srcdepfetch := tc.Go("mod", "download")
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srcdepfetch.Env = append(srcdepfetch.Env, "GOPATH="+filepath.Join(*workdir, "modgopath"))
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build.MustRun(srcdepfetch)
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cidepfetch := goTool("run", "./build/ci.go")
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cidepfetch.Env = append(os.Environ(), "GOPATH="+filepath.Join(*workdir, "modgopath"))
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cidepfetch := tc.Go("run", "./build/ci.go")
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cidepfetch.Env = append(cidepfetch.Env, "GOPATH="+filepath.Join(*workdir, "modgopath"))
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cidepfetch.Run() // Command fails, don't care, we only need the deps to start it
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// Create Debian packages and upload them.
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@ -592,41 +540,6 @@ func downloadGoSources(cachedir string) string {
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return dst
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}
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// downloadGo downloads the Go binary distribution and unpacks it into a temporary
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// directory. It returns the GOROOT of the unpacked toolchain.
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func downloadGo(goarch, goos, cachedir string) string {
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if goarch == "arm" {
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goarch = "armv6l"
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}
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csdb := build.MustLoadChecksums("build/checksums.txt")
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file := fmt.Sprintf("go%s.%s-%s", dlgoVersion, goos, goarch)
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if goos == "windows" {
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file += ".zip"
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} else {
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file += ".tar.gz"
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}
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url := "https://golang.org/dl/" + file
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dst := filepath.Join(cachedir, file)
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if err := csdb.DownloadFile(url, dst); err != nil {
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log.Fatal(err)
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}
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ucache, err := os.UserCacheDir()
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if err != nil {
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log.Fatal(err)
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}
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godir := filepath.Join(ucache, fmt.Sprintf("geth-go-%s-%s-%s", dlgoVersion, goos, goarch))
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if err := build.ExtractArchive(dst, godir); err != nil {
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log.Fatal(err)
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}
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goroot, err := filepath.Abs(filepath.Join(godir, "go"))
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if err != nil {
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log.Fatal(err)
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}
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return goroot
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}
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func ppaUpload(workdir, ppa, sshUser string, files []string) {
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p := strings.Split(ppa, "/")
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if len(p) != 2 {
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@ -901,13 +814,23 @@ func doAndroidArchive(cmdline []string) {
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)
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flag.CommandLine.Parse(cmdline)
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env := build.Env()
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tc := new(build.GoToolchain)
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// Sanity check that the SDK and NDK are installed and set
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if os.Getenv("ANDROID_HOME") == "" {
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log.Fatal("Please ensure ANDROID_HOME points to your Android SDK")
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}
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// Build gomobile.
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install := tc.Install(GOBIN, "golang.org/x/mobile/cmd/gomobile@latest", "golang.org/x/mobile/cmd/gobind@latest")
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install.Env = append(install.Env)
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build.MustRun(install)
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// Ensure all dependencies are available. This is required to make
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// gomobile bind work because it expects go.sum to contain all checksums.
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build.MustRun(tc.Go("mod", "download"))
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// Build the Android archive and Maven resources
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build.MustRun(goTool("get", "golang.org/x/mobile/cmd/gomobile", "golang.org/x/mobile/cmd/gobind"))
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build.MustRun(gomobileTool("bind", "-ldflags", "-s -w", "--target", "android", "--javapkg", "org.ethereum", "-v", "github.com/ethereum/go-ethereum/mobile"))
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if *local {
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@ -1027,10 +950,16 @@ func doXCodeFramework(cmdline []string) {
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)
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flag.CommandLine.Parse(cmdline)
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env := build.Env()
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tc := new(build.GoToolchain)
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// Build gomobile.
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build.MustRun(tc.Install(GOBIN, "golang.org/x/mobile/cmd/gomobile@latest", "golang.org/x/mobile/cmd/gobind@latest"))
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// Ensure all dependencies are available. This is required to make
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// gomobile bind work because it expects go.sum to contain all checksums.
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build.MustRun(tc.Go("mod", "download"))
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// Build the iOS XCode framework
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build.MustRun(goTool("get", "golang.org/x/mobile/cmd/gomobile", "golang.org/x/mobile/cmd/gobind"))
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build.MustRun(gomobileTool("init"))
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bind := gomobileTool("bind", "-ldflags", "-s -w", "--target", "ios", "-v", "github.com/ethereum/go-ethereum/mobile")
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if *local {
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@ -1039,17 +968,14 @@ func doXCodeFramework(cmdline []string) {
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build.MustRun(bind)
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return
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}
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// Create the archive.
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maybeSkipArchive(env)
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archive := "geth-" + archiveBasename("ios", params.ArchiveVersion(env.Commit))
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if err := os.Mkdir(archive, os.ModePerm); err != nil {
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log.Fatal(err)
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}
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bind.Dir, _ = filepath.Abs(archive)
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build.MustRun(bind)
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build.MustRunCommand("tar", "-zcvf", archive+".tar.gz", archive)
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// Skip CocoaPods deploy and Azure upload for PR builds
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maybeSkipArchive(env)
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// Sign and upload the framework to Azure
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if err := archiveUpload(archive+".tar.gz", *upload, *signer, *signify); err != nil {
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log.Fatal(err)
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@ -1115,10 +1041,10 @@ func doXgo(cmdline []string) {
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)
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flag.CommandLine.Parse(cmdline)
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env := build.Env()
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var tc build.GoToolchain
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// Make sure xgo is available for cross compilation
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gogetxgo := goTool("get", "github.com/karalabe/xgo")
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build.MustRun(gogetxgo)
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build.MustRun(tc.Install(GOBIN, "github.com/karalabe/xgo@latest"))
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// If all tools building is requested, build everything the builder wants
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args := append(buildFlags(env), flag.Args()...)
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@ -1129,27 +1055,23 @@ func doXgo(cmdline []string) {
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if strings.HasPrefix(res, GOBIN) {
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// Binary tool found, cross build it explicitly
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args = append(args, "./"+filepath.Join("cmd", filepath.Base(res)))
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xgo := xgoTool(args)
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build.MustRun(xgo)
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build.MustRun(xgoTool(args))
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args = args[:len(args)-1]
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}
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}
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return
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}
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// Otherwise xxecute the explicit cross compilation
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// Otherwise execute the explicit cross compilation
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path := args[len(args)-1]
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args = append(args[:len(args)-1], []string{"--dest", GOBIN, path}...)
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xgo := xgoTool(args)
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build.MustRun(xgo)
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build.MustRun(xgoTool(args))
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}
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func xgoTool(args []string) *exec.Cmd {
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cmd := exec.Command(filepath.Join(GOBIN, "xgo"), args...)
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cmd.Env = os.Environ()
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cmd.Env = append(cmd.Env, []string{
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"GOBIN=" + GOBIN,
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}...)
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cmd.Env = append(cmd.Env, []string{"GOBIN=" + GOBIN}...)
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return cmd
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}
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@ -38,6 +38,7 @@ var (
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// Environment contains metadata provided by the build environment.
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type Environment struct {
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CI bool
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Name string // name of the environment
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Repo string // name of GitHub repo
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Commit, Date, Branch, Tag string // Git info
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@ -61,6 +62,7 @@ func Env() Environment {
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commit = os.Getenv("TRAVIS_COMMIT")
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}
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return Environment{
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CI: true,
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Name: "travis",
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Repo: os.Getenv("TRAVIS_REPO_SLUG"),
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Commit: commit,
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@ -77,6 +79,7 @@ func Env() Environment {
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commit = os.Getenv("APPVEYOR_REPO_COMMIT")
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}
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return Environment{
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CI: true,
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Name: "appveyor",
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Repo: os.Getenv("APPVEYOR_REPO_NAME"),
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Commit: commit,
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149
internal/build/gotool.go
Normal file
149
internal/build/gotool.go
Normal file
@ -0,0 +1,149 @@
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// Copyright 2021 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package build
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"log"
|
||||
"os"
|
||||
"os/exec"
|
||||
"path/filepath"
|
||||
"runtime"
|
||||
"strings"
|
||||
)
|
||||
|
||||
type GoToolchain struct {
|
||||
Root string // GOROOT
|
||||
|
||||
// Cross-compilation variables. These are set when running the go tool.
|
||||
GOARCH string
|
||||
GOOS string
|
||||
CC string
|
||||
}
|
||||
|
||||
// Go creates an invocation of the go command.
|
||||
func (g *GoToolchain) Go(command string, args ...string) *exec.Cmd {
|
||||
tool := g.goTool(command, args...)
|
||||
|
||||
// Configure environment for cross build.
|
||||
if g.GOARCH != "" && g.GOARCH != runtime.GOARCH {
|
||||
tool.Env = append(tool.Env, "CGO_ENABLED=1")
|
||||
tool.Env = append(tool.Env, "GOARCH="+g.GOARCH)
|
||||
}
|
||||
if g.GOOS != "" && g.GOOS != runtime.GOOS {
|
||||
tool.Env = append(tool.Env, "GOOS="+g.GOOS)
|
||||
}
|
||||
// Configure C compiler.
|
||||
if g.CC != "" {
|
||||
tool.Env = append(tool.Env, "CC="+g.CC)
|
||||
} else if os.Getenv("CC") != "" {
|
||||
tool.Env = append(tool.Env, "CC="+os.Getenv("CC"))
|
||||
}
|
||||
return tool
|
||||
}
|
||||
|
||||
// Install creates an invocation of 'go install'. The command is configured to output
|
||||
// executables to the given 'gobin' directory.
|
||||
//
|
||||
// This can be used to install auxiliary build tools without modifying the local go.mod and
|
||||
// go.sum files. To install tools which are not required by go.mod, ensure that all module
|
||||
// paths in 'args' contain a module version suffix (e.g. "...@latest").
|
||||
func (g *GoToolchain) Install(gobin string, args ...string) *exec.Cmd {
|
||||
if !filepath.IsAbs(gobin) {
|
||||
panic("GOBIN must be an absolute path")
|
||||
}
|
||||
tool := g.goTool("install")
|
||||
tool.Env = append(tool.Env, "GOBIN="+gobin)
|
||||
tool.Args = append(tool.Args, "-mod=readonly")
|
||||
tool.Args = append(tool.Args, args...)
|
||||
|
||||
// Ensure GOPATH is set because go install seems to absolutely require it. This uses
|
||||
// 'go env' because it resolves the default value when GOPATH is not set in the
|
||||
// environment. Ignore errors running go env and leave any complaining about GOPATH to
|
||||
// the install command.
|
||||
pathTool := g.goTool("env", "GOPATH")
|
||||
output, _ := pathTool.Output()
|
||||
tool.Env = append(tool.Env, "GOPATH="+string(output))
|
||||
return tool
|
||||
}
|
||||
|
||||
func (g *GoToolchain) goTool(command string, args ...string) *exec.Cmd {
|
||||
if g.Root == "" {
|
||||
g.Root = runtime.GOROOT()
|
||||
}
|
||||
tool := exec.Command(filepath.Join(g.Root, "bin", "go"), command)
|
||||
tool.Args = append(tool.Args, args...)
|
||||
tool.Env = append(tool.Env, "GOROOT="+g.Root)
|
||||
|
||||
// Forward environment variables to the tool, but skip compiler target settings.
|
||||
// TODO: what about GOARM?
|
||||
skip := map[string]struct{}{"GOROOT": {}, "GOARCH": {}, "GOOS": {}, "GOBIN": {}, "CC": {}}
|
||||
for _, e := range os.Environ() {
|
||||
if i := strings.IndexByte(e, '='); i >= 0 {
|
||||
if _, ok := skip[e[:i]]; ok {
|
||||
continue
|
||||
}
|
||||
}
|
||||
tool.Env = append(tool.Env, e)
|
||||
}
|
||||
return tool
|
||||
}
|
||||
|
||||
// DownloadGo downloads the Go binary distribution and unpacks it into a temporary
|
||||
// directory. It returns the GOROOT of the unpacked toolchain.
|
||||
func DownloadGo(csdb *ChecksumDB, version string) string {
|
||||
// Shortcut: if the Go version that runs this script matches the
|
||||
// requested version exactly, there is no need to download anything.
|
||||
activeGo := strings.TrimPrefix(runtime.Version(), "go")
|
||||
if activeGo == version {
|
||||
log.Printf("-dlgo version matches active Go version %s, skipping download.", activeGo)
|
||||
return runtime.GOROOT()
|
||||
}
|
||||
|
||||
ucache, err := os.UserCacheDir()
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
// For Arm architecture, GOARCH includes ISA version.
|
||||
os := runtime.GOOS
|
||||
arch := runtime.GOARCH
|
||||
if arch == "arm" {
|
||||
arch = "armv6l"
|
||||
}
|
||||
file := fmt.Sprintf("go%s.%s-%s", version, os, arch)
|
||||
if os == "windows" {
|
||||
file += ".zip"
|
||||
} else {
|
||||
file += ".tar.gz"
|
||||
}
|
||||
url := "https://golang.org/dl/" + file
|
||||
dst := filepath.Join(ucache, file)
|
||||
if err := csdb.DownloadFile(url, dst); err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
godir := filepath.Join(ucache, fmt.Sprintf("geth-go-%s-%s-%s", version, os, arch))
|
||||
if err := ExtractArchive(dst, godir); err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
goroot, err := filepath.Abs(filepath.Join(godir, "go"))
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
return goroot
|
||||
}
|
||||
@ -29,7 +29,6 @@ import (
|
||||
"os/exec"
|
||||
"path"
|
||||
"path/filepath"
|
||||
"runtime"
|
||||
"strings"
|
||||
"text/template"
|
||||
)
|
||||
@ -111,19 +110,6 @@ func render(tpl *template.Template, outputFile string, outputPerm os.FileMode, x
|
||||
}
|
||||
}
|
||||
|
||||
// GoTool returns the command that runs a go tool. This uses go from GOROOT instead of PATH
|
||||
// so that go commands executed by build use the same version of Go as the 'host' that runs
|
||||
// build code. e.g.
|
||||
//
|
||||
// /usr/lib/go-1.12.1/bin/go run build/ci.go ...
|
||||
//
|
||||
// runs using go 1.12.1 and invokes go 1.12.1 tools from the same GOROOT. This is also important
|
||||
// because runtime.Version checks on the host should match the tools that are run.
|
||||
func GoTool(tool string, args ...string) *exec.Cmd {
|
||||
args = append([]string{tool}, args...)
|
||||
return exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
|
||||
}
|
||||
|
||||
// UploadSFTP uploads files to a remote host using the sftp command line tool.
|
||||
// The destination host may be specified either as [user@]host[: or as a URI in
|
||||
// the form sftp://[user@]host[:port].
|
||||
|
||||
Loading…
Reference in New Issue
Block a user