skip: introduce a skip package with utilities for skipping test cases

README.md

@@ -8,15 +8,20 @@
 
 `test` is a modern and generics oriented testing assertions library for Go.
 
-There are four key packages,
+There are five key packages,
 
 - `must` - assertions causing test failure and halt the test case immediately
 - `test` - assertions causing test failure and allow the test case to continue
 - `wait` - utilities for waiting on conditionals in tests
+- `skip` - utilities for skipping test cases in some situations
 - `portal` - utilities for allocating free ports for network listeners in tests
 
 ### Changes
 
+:ballot_box_with_check: v1.8.0 introduces the `skip` package for skipping tests!
+
+ - New helper functions for skipping out tests based on environment detection
+
 :ballot_box_with_check: v1.7.0 marks the first stable release!
 
  - Going forward no breaking changes will be made without a v2 major version
@@ -155,6 +160,21 @@ must.Eq(t, exp, result, must.Func(func() string {
 })
 ```
 
+### Skip
+
+Sometimes it makes sense to just skip running a certain test case. Maybe the
+operating system is all wrong or a certain necessary command is not currently
+installed. The `skip` package provides utilities for skipping tests under some
+given circumstances.
+
+```go
+skip.OperatingSystem(t, "windows")
+```
+
+```go
+skip.CommandNotFound(t, "java")
+```
+
 ### Wait
 
 Sometimes a test needs to wait on a condition for a non-deterministic amount of time.

skip/skip.go

@@ -0,0 +1,179 @@
+// Copyright (c) The Test Authors
+// SPDX-License-Identifier: MPL-2.0
+
+// Package skip provides helper functions for skipping test cases in
+// environments that meet certain conditions.
+package skip
+
+import (
+	"context"
+	"errors"
+	"os"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"strings"
+	"testing"
+	"time"
+)
+
+// OperatingSystem will skip the test if the Go runtime detects the operating system
+// matches one of the given names.
+func OperatingSystem(t *testing.T, names ...string) {
+	os := runtime.GOOS
+	for _, name := range names {
+		if os == strings.ToLower(name) {
+			t.Skipf("operating system excluded from tests %q", os)
+		}
+	}
+}
+
+// NotOperatingSystem will skip the test if the Go runtime detects the operating
+// system does not match one of the given names.
+func NotOperatingSystem(t *testing.T, names ...string) {
+	os := runtime.GOOS
+	for _, name := range names {
+		if os == strings.ToLower(name) {
+			return
+		}
+	}
+	t.Skipf("operating excluded from tests %q", os)
+}
+
+// RootUser will skip the test if the test is being run as the root user.
+//
+// Uses the effective UID value to determine user.
+func RootUser(t *testing.T) {
+	euid := os.Geteuid()
+	if euid == 0 {
+		t.Skip("test must not run as root")
+	}
+}
+
+// NotRootUser will skip the test if the test is not being run as the root user.
+//
+// Uses the effective UID value to determine user.
+func NotRootUser(t *testing.T) {
+	euid := os.Geteuid()
+	if euid != 0 {
+		t.Skip("test must run as root")
+	}
+}
+
+// Architecture will skip the test if the Go runtime detects the system
+// architecture matches one of the given names.
+func Architecture(t *testing.T, names ...string) {
+	arch := runtime.GOARCH
+	for _, name := range names {
+		if arch == strings.ToLower(name) {
+			t.Skipf("arch excluded from tests %q", arch)
+		}
+	}
+}
+
+// NotArchitecture will skip the test if the Go runtime the system architecture
+// does not match one of the given names.
+func NotArchitecture(t *testing.T, names ...string) {
+	arch := runtime.GOARCH
+	for _, name := range names {
+		if arch == strings.ToLower(name) {
+			return
+		}
+	}
+	t.Skipf("arch excluded from tests %q", arch)
+}
+
+func cmdAvailable(name string) bool {
+	_, err := exec.LookPath(name)
+	return !errors.Is(err, exec.ErrNotFound)
+}
+
+// CommandNotFound will skip the test if the given command cannot be found on
+// the system.
+func CommandNotFound(t *testing.T, command string) {
+	if !cmdAvailable(command) {
+		t.Skipf("command %q not detected on system", command)
+	}
+}
+
+// DockerNotFound will skip the test if the docker command cannot be found on
+// the system path.
+func DockerNotFound(t *testing.T) {
+	if !cmdAvailable("docker") {
+		t.Skip("docker not detected on system")
+	}
+}
+
+// PodmanNotFound will skip the test if the podman command cannot be found on
+// the system path.
+func PodmanNotFound(t *testing.T) {
+	if !cmdAvailable("podman") {
+		t.Skip("podman not detected on system")
+	}
+}
+
+// MinimumCores will skip the test if the system does not meet the minimum
+// number of CPU cores.
+func MinimumCores(t *testing.T, num int) {
+	cpus := runtime.NumCPU()
+	if cpus < num {
+		t.Skip("system does not meet minimum cpu cores")
+	}
+}
+
+// MaximumCores will skip the test if the system does not meet the maximum
+// number of cpu cores.
+func MaximumCores(t *testing.T, num int) {
+	cpus := runtime.NumCPU()
+	if cpus > num {
+		t.Skip("system exceeds maximum cpu cores")
+	}
+}
+
+// CgroupsVersion will skip the test if the system does not match the given
+// cgroups version.
+func CgroupsVersion(t *testing.T, version int) {
+	if runtime.GOOS != "linux" {
+		t.Skip("cgroups requires linux")
+	}
+
+	mType := mountType(t, "/sys/fs/cgroup")
+
+	switch mType {
+	case "tmpfs":
+		// this is a cgroups v1 system
+		if version == 2 {
+			t.Skip("system does not match cgroups version 2")
+		}
+	case "cgroup2":
+		// this is a cgroups v2 system
+		if version == 1 {
+			t.Skip("system does not match cgroups version 1")
+		}
+	default:
+		t.Fatalf("unknown cgroups mount type %q", mType)
+	}
+}
+
+func mountType(t *testing.T, path string) string {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	cmd := exec.CommandContext(ctx, "df", "-T", path)
+	b, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("unable to run df command: %v", err)
+	}
+
+	// need the first token of the second line
+	output := string(b)
+	tokenRe := regexp.MustCompile(`on\s+([\w]+)\s+`)
+	results := tokenRe.FindStringSubmatch(output)
+	if len(results) != 2 {
+		t.Fatal("no mount type for path")
+	}
+	return results[1]
+}
+
+// TODO
+// - landlock detection

skip/skip_test.go

@@ -0,0 +1,73 @@
+// Copyright (c) The Test Authors
+// SPDX-License-Identifier: MPL-2.0
+
+//go:build linux || darwin
+
+package skip
+
+import "testing"
+
+func TestSkip_OperatingSystem(t *testing.T) {
+	OperatingSystem(t, "darwin", "linux", "windows")
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_NotOperatingSystem(t *testing.T) {
+	NotOperatingSystem(t, "windows")
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_RootUser(t *testing.T) {
+	t.Skip("requires root")
+	RootUser(t)
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_NotRootUser(t *testing.T) {
+	NotRootUser(t)
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_Architecture(t *testing.T) {
+	Architecture(t, "arm64", "amd64")
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_NotArchitecture(t *testing.T) {
+	NotArchitecture(t, "itanium", "mips")
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_DockerNotFound(t *testing.T) {
+	t.Skip("skip docker test") // gha runner
+
+	DockerNotFound(t)
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_PodmanNotFound(t *testing.T) {
+	t.Skip("skip podman test") // gha runner
+
+	PodmanNotFound(t)
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_CommandNotFound(t *testing.T) {
+	CommandNotFound(t, "doesnotexist")
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_MinimumCores(t *testing.T) {
+	MinimumCores(t, 200)
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_MaximumCores(t *testing.T) {
+	MaximumCores(t, 2)
+	t.Fatal("expected to skip test")
+}
+
+func TestSkip_CgroupsVersion(t *testing.T) {
+	CgroupsVersion(t, 1)
+	t.Fatal("expected to skip test")
+}