feat: Added ability to use exec on filesystems.

Currently works only for the docker plugin.

Signed-off-by: Spencer Brower <[email protected]>

plugin/docker/container.go

@@ -105,7 +105,7 @@ func (c *container) Exec(ctx context.Context, cmd string, args []string, opts pl
 	command := append([]string{cmd}, args...)
 	activity.Record(ctx, "Exec %v on %v", command, c.Name())
 
-	cfg := types.ExecConfig{Cmd: command, AttachStdout: true, AttachStderr: true, Tty: opts.Tty}
+	cfg := types.ExecConfig{Cmd: command, AttachStdout: true, AttachStderr: true, Tty: opts.Tty, WorkingDir: opts.WorkingDir}
 	if opts.Stdin != nil || opts.Tty {
 		cfg.AttachStdin = true
 	}

plugin/types.go

@@ -141,6 +141,9 @@ type ExecOptions struct {
 
 	// Elevate execution to run as a privileged user if not already running as a privileged user.
 	Elevate bool `json:"elevate"`
+
+	// WorkingDir is the directory in which to execute the command.
+	WorkingDir string
 }
 
 // ExecPacketType identifies the packet type.

volume/core.go

@@ -53,7 +53,7 @@ type dirMap struct {
 // ChildSchemas returns a volume's child schema
 func ChildSchemas() []*plugin.EntrySchema {
 	return []*plugin.EntrySchema{
-		(&dir{}).Schema(),
+		(&execableDir{}).Schema(),
 		(&file{}).Schema(),
 	}
 }
@@ -66,6 +66,9 @@ const RootPath = ""
 // Requests are cached against the supplied Interface using the VolumeListCB op.
 func List(ctx context.Context, impl Interface) ([]plugin.Entry, error) {
 	// Start with the implementation as the cache key so we re-use data we get from it for subdirectory queries.
+	if exImpl, ok := impl.(execableInterface); ok {
+		return newExecDir("dummy", plugin.EntryAttributes{}, exImpl, RootPath).List(ctx)
+	}
 	return newDir("dummy", plugin.EntryAttributes{}, impl, RootPath).List(ctx)
 }
 

volume/execable_dir.go

@@ -0,0 +1,59 @@
+package volume
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/puppetlabs/wash/plugin"
+)
+
+type execableInterface interface {
+	Interface
+	VolumeExec(ctx context.Context, path string, cmd string, args []string, opts plugin.ExecOptions) (plugin.ExecCommand, error)
+}
+
+// execableDir adds the exec action to dir.
+type execableDir struct {
+	dir
+	impl execableInterface
+}
+
+func newExecDir(name string, attr plugin.EntryAttributes, impl execableInterface, path string) *execableDir {
+	e := new(execableDir)
+	e.dir = *newDir(name, attr, impl, path)
+	e.impl = impl
+	return e
+}
+
+func (v *execableDir) Exec(ctx context.Context, cmd string, args []string, opts plugin.ExecOptions) (plugin.ExecCommand, error) {
+	return v.impl.VolumeExec(ctx, v.path, cmd, args, opts)
+}
+
+func (v *execableDir) generateChildren(dirmap *dirMap) []plugin.Entry {
+	entries := v.dir.generateChildren(dirmap)
+
+	for i, entry := range entries {
+		dir, ok := entry.(*dir)
+		if ok {
+			fmt.Println(dir)
+			entries[i] = &execableDir{dir: *dir, impl: v.impl}
+		}
+	}
+	return entries
+}
+
+// List lists the children of the directory.
+func (v *execableDir) List(ctx context.Context) ([]plugin.Entry, error) {
+	if v.dirmap != nil {
+		// Children have been pre-populated by a source parent.
+		return v.generateChildren(v.dirmap), nil
+	}
+
+	// Generate child hierarchy. Don't store it on this entry, but populate new dirs from it.
+	dirmap, err := v.impl.VolumeList(ctx, v.path)
+	if err != nil {
+		return nil, err
+	}
+
+	return v.generateChildren(&dirMap{mp: dirmap}), nil
+}

volume/fs.go

@@ -243,6 +243,12 @@ func (d *FS) loginShell() plugin.Shell {
 	return plugin.POSIXShell
 }
 
+// VolumeExec executes cmd in the directory at path.
+func (d *FS) VolumeExec(ctx context.Context, path string, cmd string, args []string, opts plugin.ExecOptions) (plugin.ExecCommand, error) {
+	opts.WorkingDir = path
+	return d.executor.Exec(ctx, cmd, args, opts)
+}
+
 const fsDescription = `
 This represents the root directory of a container/VM. It lets you navigate
 and interact with that container/VM's filesystem as if you were logged into