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package testutils
import (
"context"
"crypto/rand"
"embed"
"encoding/base64"
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"testing"
"github.com/docker/docker/api/types"
"github.com/pkg/errors"
"gotest.tools/v3/assert"
"gotest.tools/v3/fs"
"gotest.tools/v3/icmd"
)
//go:embed plugins/*
var plugins embed.FS
// SetupPlugin builds a plugin and creates a temporary
// directory with the plugin's config.json and rootfs.
func SetupPlugin(t *testing.T, ctx context.Context) *fs.Dir {
t.Helper()
p := &types.PluginConfig{
Linux: types.PluginConfigLinux{
Capabilities: []string{"CAP_SYS_ADMIN"},
},
Interface: types.PluginConfigInterface{
Socket: "basic.sock",
Types: []types.PluginInterfaceType{{Capability: "docker.dummy/1.0"}},
},
Entrypoint: []string{"/basic"},
}
configJSON, err := json.Marshal(p)
assert.NilError(t, err)
binPath, err := buildPlugin(t, ctx)
assert.NilError(t, err)
dir := fs.NewDir(t, "plugin_test",
fs.WithFile("config.json", string(configJSON), fs.WithMode(0o644)),
fs.WithDir("rootfs", fs.WithMode(0o755)),
)
icmd.RunCommand("/bin/cp", binPath, dir.Join("rootfs", p.Entrypoint[0])).Assert(t, icmd.Success)
return dir
}
// buildPlugin uses Go to build a plugin from one of the source files in the plugins directory.
// It returns the path to the built plugin binary.
// To allow for multiple plugins to be built in parallel, the plugin is compiled with a unique
// identifier in the binary. This is done by setting a linker flag with the -ldflags option.
func buildPlugin(t *testing.T, ctx context.Context) (string, error) {
t.Helper()
randomName, err := randomString()
if err != nil {
return "", err
}
goBin, err := exec.LookPath("/usr/local/go/bin/go")
if err != nil {
return "", err
}
installPath := filepath.Join(os.Getenv("GOPATH"), "bin", randomName)
pluginContent, err := plugins.ReadFile("plugins/basic.go")
if err != nil {
return "", err
}
dir := fs.NewDir(t, "plugin_build")
if err := os.WriteFile(dir.Join("main.go"), pluginContent, 0o644); err != nil {
return "", err
}
defer dir.Remove()
cmd := exec.CommandContext(ctx, goBin, "build", "-ldflags",
fmt.Sprintf("-X 'main.UNIQUEME=%s'", randomName),
"-o", installPath, dir.Join("main.go"))
cmd.Env = append(os.Environ(), "CGO_ENABLED=0")
if out, err := cmd.CombinedOutput(); err != nil {
return "", errors.Wrapf(err, "error building basic plugin bin: %s", string(out))
}
return installPath, nil
}
func randomString() (string, error) {
b := make([]byte, 8)
if _, err := rand.Read(b); err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(b), nil
}
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