mirror of https://github.com/docker/cli.git
125 lines
3.7 KiB
Go
125 lines
3.7 KiB
Go
package manager
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import (
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"context"
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"encoding/json"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strings"
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"github.com/pkg/errors"
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"github.com/spf13/cobra"
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)
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var pluginNameRe = regexp.MustCompile("^[a-z][a-z0-9]*$")
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// Plugin represents a potential plugin with all it's metadata.
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type Plugin struct {
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Metadata
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Name string `json:",omitempty"`
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Path string `json:",omitempty"`
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// Err is non-nil if the plugin failed one of the candidate tests.
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Err error `json:",omitempty"`
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// ShadowedPaths contains the paths of any other plugins which this plugin takes precedence over.
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ShadowedPaths []string `json:",omitempty"`
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}
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// newPlugin determines if the given candidate is valid and returns a
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// Plugin. If the candidate fails one of the tests then `Plugin.Err`
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// is set, and is always a `pluginError`, but the `Plugin` is still
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// returned with no error. An error is only returned due to a
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// non-recoverable error.
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func newPlugin(c Candidate, cmds []*cobra.Command) (Plugin, error) {
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path := c.Path()
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if path == "" {
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return Plugin{}, errors.New("plugin candidate path cannot be empty")
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}
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// The candidate listing process should have skipped anything
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// which would fail here, so there are all real errors.
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fullname := filepath.Base(path)
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if fullname == "." {
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return Plugin{}, errors.Errorf("unable to determine basename of plugin candidate %q", path)
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}
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var err error
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if fullname, err = trimExeSuffix(fullname); err != nil {
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return Plugin{}, errors.Wrapf(err, "plugin candidate %q", path)
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}
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if !strings.HasPrefix(fullname, NamePrefix) {
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return Plugin{}, errors.Errorf("plugin candidate %q: does not have %q prefix", path, NamePrefix)
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}
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p := Plugin{
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Name: strings.TrimPrefix(fullname, NamePrefix),
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Path: path,
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}
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// Now apply the candidate tests, so these update p.Err.
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if !pluginNameRe.MatchString(p.Name) {
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p.Err = NewPluginError("plugin candidate %q did not match %q", p.Name, pluginNameRe.String())
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return p, nil
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}
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for _, cmd := range cmds {
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// Ignore conflicts with commands which are
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// just plugin stubs (i.e. from a previous
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// call to AddPluginCommandStubs).
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if IsPluginCommand(cmd) {
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continue
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}
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if cmd.Name() == p.Name {
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p.Err = NewPluginError("plugin %q duplicates builtin command", p.Name)
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return p, nil
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}
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if cmd.HasAlias(p.Name) {
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p.Err = NewPluginError("plugin %q duplicates an alias of builtin command %q", p.Name, cmd.Name())
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return p, nil
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}
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}
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// We are supposed to check for relevant execute permissions here. Instead we rely on an attempt to execute.
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meta, err := c.Metadata()
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if err != nil {
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p.Err = wrapAsPluginError(err, "failed to fetch metadata")
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return p, nil
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}
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if err := json.Unmarshal(meta, &p.Metadata); err != nil {
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p.Err = wrapAsPluginError(err, "invalid metadata")
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return p, nil
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}
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if p.Metadata.SchemaVersion != "0.1.0" {
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p.Err = NewPluginError("plugin SchemaVersion %q is not valid, must be 0.1.0", p.Metadata.SchemaVersion)
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return p, nil
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}
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if p.Metadata.Vendor == "" {
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p.Err = NewPluginError("plugin metadata does not define a vendor")
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return p, nil
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}
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return p, nil
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}
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// RunHook executes the plugin's hooks command
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// and returns its unprocessed output.
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func (p *Plugin) RunHook(ctx context.Context, hookData HookPluginData) ([]byte, error) {
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hDataBytes, err := json.Marshal(hookData)
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if err != nil {
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return nil, wrapAsPluginError(err, "failed to marshall hook data")
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}
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pCmd := exec.CommandContext(ctx, p.Path, p.Name, HookSubcommandName, string(hDataBytes))
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pCmd.Env = os.Environ()
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pCmd.Env = append(pCmd.Env, ReexecEnvvar+"="+os.Args[0])
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hookCmdOutput, err := pCmd.Output()
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if err != nil {
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return nil, wrapAsPluginError(err, "failed to execute plugin hook subcommand")
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}
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return hookCmdOutput, nil
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}
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