Add cimfs differ and snapshotter

Details about CimFs project are discussed in #8346

Signed-off-by: Amit Barve <ambarve@microsoft.com>

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs.go

@@ -89,7 +89,7 @@ func putBuf(b *bytes.Buffer) {
 	bytesBufferPool.Put(b)
 }
 
-// Runhcs is the client to the runhcs cli
+// Runhcs is the client to the runhcs cli.
 type Runhcs struct {
 	// Debug enables debug output for logging.
 	Debug bool
@@ -130,8 +130,8 @@ func (r *Runhcs) args() []string {
 	return out
 }
 
-func (r *Runhcs) command(context context.Context, args ...string) *exec.Cmd {
-	cmd := exec.CommandContext(context, getCommandPath(), append(r.args(), args...)...)
+func (r *Runhcs) command(ctx context.Context, args ...string) *exec.Cmd {
+	cmd := exec.CommandContext(ctx, getCommandPath(), append(r.args(), args...)...)
 	cmd.Env = os.Environ()
 	return cmd
 }
@@ -139,7 +139,7 @@ func (r *Runhcs) command(context context.Context, args ...string) *exec.Cmd {
 // runOrError will run the provided command.  If an error is
 // encountered and neither Stdout or Stderr was set the error and the
 // stderr of the command will be returned in the format of <error>:
-// <stderr>
+// <stderr>.
 func (r *Runhcs) runOrError(cmd *exec.Cmd) error {
 	if cmd.Stdout != nil || cmd.Stderr != nil {
 		ec, err := runc.Monitor.Start(cmd)
@@ -154,7 +154,7 @@ func (r *Runhcs) runOrError(cmd *exec.Cmd) error {
 	}
 	data, err := cmdOutput(cmd, true)
 	if err != nil {
-		return fmt.Errorf("%s: %s", err, data)
+		return fmt.Errorf("%s: %s", err, data) //nolint:errorlint // legacy code
 	}
 	return nil
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_create-scratch.go

@@ -10,8 +10,8 @@ import (
 )
 
 // CreateScratch creates a scratch vhdx at 'destpath' that is ext4 formatted.
-func (r *Runhcs) CreateScratch(context context.Context, destpath string) error {
-	return r.CreateScratchWithOpts(context, destpath, nil)
+func (r *Runhcs) CreateScratch(ctx context.Context, destpath string) error {
+	return r.CreateScratchWithOpts(ctx, destpath, nil)
 }
 
 // CreateScratchOpts is the set of options that can be used with the
@@ -43,7 +43,7 @@ func (opt *CreateScratchOpts) args() ([]string, error) {
 
 // CreateScratchWithOpts creates a scratch vhdx at 'destpath' that is ext4
 // formatted based on `opts`.
-func (r *Runhcs) CreateScratchWithOpts(context context.Context, destpath string, opts *CreateScratchOpts) error {
+func (r *Runhcs) CreateScratchWithOpts(ctx context.Context, destpath string, opts *CreateScratchOpts) error {
 	args := []string{"create-scratch", "--destpath", destpath}
 	if opts != nil {
 		oargs, err := opts.args()
@@ -52,5 +52,5 @@ func (r *Runhcs) CreateScratchWithOpts(context context.Context, destpath string,
 		}
 		args = append(args, oargs...)
 	}
-	return r.runOrError(r.command(context, args...))
+	return r.runOrError(r.command(ctx, args...))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_create.go

@@ -64,7 +64,7 @@ func (opt *CreateOpts) args() ([]string, error) {
 
 // Create creates a new container and returns its pid if it was created
 // successfully.
-func (r *Runhcs) Create(context context.Context, id, bundle string, opts *CreateOpts) error {
+func (r *Runhcs) Create(ctx context.Context, id, bundle string, opts *CreateOpts) error {
 	args := []string{"create", "--bundle", bundle}
 	if opts != nil {
 		oargs, err := opts.args()
@@ -73,14 +73,14 @@ func (r *Runhcs) Create(context context.Context, id, bundle string, opts *Create
 		}
 		args = append(args, oargs...)
 	}
-	cmd := r.command(context, append(args, id)...)
+	cmd := r.command(ctx, append(args, id)...)
 	if opts != nil && opts.IO != nil {
 		opts.Set(cmd)
 	}
 	if cmd.Stdout == nil && cmd.Stderr == nil {
 		data, err := cmdOutput(cmd, true)
 		if err != nil {
-			return fmt.Errorf("%s: %s", err, data)
+			return fmt.Errorf("%s: %s", err, data) //nolint:errorlint // legacy code
 		}
 		return nil
 	}

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_delete.go

@@ -22,7 +22,7 @@ func (opt *DeleteOpts) args() ([]string, error) {
 
 // Delete any resources held by the container often used with detached
 // containers.
-func (r *Runhcs) Delete(context context.Context, id string, opts *DeleteOpts) error {
+func (r *Runhcs) Delete(ctx context.Context, id string, opts *DeleteOpts) error {
 	args := []string{"delete"}
 	if opts != nil {
 		oargs, err := opts.args()
@@ -31,5 +31,5 @@ func (r *Runhcs) Delete(context context.Context, id string, opts *DeleteOpts) er
 		}
 		args = append(args, oargs...)
 	}
-	return r.runOrError(r.command(context, append(args, id)...))
+	return r.runOrError(r.command(ctx, append(args, id)...))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_exec.go

@@ -51,7 +51,7 @@ func (opt *ExecOpts) args() ([]string, error) {
 
 // Exec executes an additional process inside the container based on the
 // oci.Process spec found at processFile.
-func (r *Runhcs) Exec(context context.Context, id, processFile string, opts *ExecOpts) error {
+func (r *Runhcs) Exec(ctx context.Context, id, processFile string, opts *ExecOpts) error {
 	args := []string{"exec", "--process", processFile}
 	if opts != nil {
 		oargs, err := opts.args()
@@ -60,14 +60,14 @@ func (r *Runhcs) Exec(context context.Context, id, processFile string, opts *Exe
 		}
 		args = append(args, oargs...)
 	}
-	cmd := r.command(context, append(args, id)...)
+	cmd := r.command(ctx, append(args, id)...)
 	if opts != nil && opts.IO != nil {
 		opts.Set(cmd)
 	}
 	if cmd.Stdout == nil && cmd.Stderr == nil {
 		data, err := cmdOutput(cmd, true)
 		if err != nil {
-			return fmt.Errorf("%s: %s", err, data)
+			return fmt.Errorf("%s: %s", err, data) //nolint:errorlint // legacy code
 		}
 		return nil
 	}

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_kill.go

@@ -8,6 +8,6 @@ import (
 
 // Kill sends the specified signal (default: SIGTERM) to the container's init
 // process.
-func (r *Runhcs) Kill(context context.Context, id, signal string) error {
-	return r.runOrError(r.command(context, "kill", id, signal))
+func (r *Runhcs) Kill(ctx context.Context, id, signal string) error {
+	return r.runOrError(r.command(ctx, "kill", id, signal))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_list.go

@@ -17,8 +17,8 @@ type ContainerState = irunhcs.ContainerState
 //
 // Note: This is specific to the Runhcs.Root namespace provided in the global
 // settings.
-func (r *Runhcs) List(context context.Context) ([]*ContainerState, error) {
-	data, err := cmdOutput(r.command(context, "list", "--format=json"), false)
+func (r *Runhcs) List(ctx context.Context) ([]*ContainerState, error) {
+	data, err := cmdOutput(r.command(ctx, "list", "--format=json"), false)
 	if err != nil {
 		return nil, err
 	}

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_pause.go

@@ -7,6 +7,6 @@ import (
 )
 
 // Pause suspends all processes inside the container.
-func (r *Runhcs) Pause(context context.Context, id string) error {
-	return r.runOrError(r.command(context, "pause", id))
+func (r *Runhcs) Pause(ctx context.Context, id string) error {
+	return r.runOrError(r.command(ctx, "pause", id))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_ps.go

@@ -9,10 +9,10 @@ import (
 )
 
 // Ps displays the processes running inside a container.
-func (r *Runhcs) Ps(context context.Context, id string) ([]int, error) {
-	data, err := cmdOutput(r.command(context, "ps", "--format=json", id), true)
+func (r *Runhcs) Ps(ctx context.Context, id string) ([]int, error) {
+	data, err := cmdOutput(r.command(ctx, "ps", "--format=json", id), true)
 	if err != nil {
-		return nil, fmt.Errorf("%s: %s", err, data)
+		return nil, fmt.Errorf("%s: %s", err, data) //nolint:errorlint // legacy code
 	}
 	var out []int
 	if err := json.Unmarshal(data, &out); err != nil {

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_resize-tty.go

@@ -22,7 +22,7 @@ func (opt *ResizeTTYOpts) args() ([]string, error) {
 }
 
 // ResizeTTY updates the terminal size for a container process.
-func (r *Runhcs) ResizeTTY(context context.Context, id string, width, height uint16, opts *ResizeTTYOpts) error {
+func (r *Runhcs) ResizeTTY(ctx context.Context, id string, width, height uint16, opts *ResizeTTYOpts) error {
 	args := []string{"resize-tty"}
 	if opts != nil {
 		oargs, err := opts.args()
@@ -31,5 +31,5 @@ func (r *Runhcs) ResizeTTY(context context.Context, id string, width, height uin
 		}
 		args = append(args, oargs...)
 	}
-	return r.runOrError(r.command(context, append(args, id, strconv.FormatUint(uint64(width), 10), strconv.FormatUint(uint64(height), 10))...))
+	return r.runOrError(r.command(ctx, append(args, id, strconv.FormatUint(uint64(width), 10), strconv.FormatUint(uint64(height), 10))...))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_resume.go

@@ -7,6 +7,6 @@ import (
 )
 
 // Resume resumes all processes that have been previously paused.
-func (r *Runhcs) Resume(context context.Context, id string) error {
-	return r.runOrError(r.command(context, "resume", id))
+func (r *Runhcs) Resume(ctx context.Context, id string) error {
+	return r.runOrError(r.command(ctx, "resume", id))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_start.go

@@ -7,6 +7,6 @@ import (
 )
 
 // Start will start an already created container.
-func (r *Runhcs) Start(context context.Context, id string) error {
-	return r.runOrError(r.command(context, "start", id))
+func (r *Runhcs) Start(ctx context.Context, id string) error {
+	return r.runOrError(r.command(ctx, "start", id))
 }

vendor/github.com/Microsoft/hcsshim/pkg/go-runhcs/runhcs_state.go

@@ -9,10 +9,10 @@ import (
 )
 
 // State outputs the state of a container.
-func (r *Runhcs) State(context context.Context, id string) (*ContainerState, error) {
-	data, err := cmdOutput(r.command(context, "state", id), true)
+func (r *Runhcs) State(ctx context.Context, id string) (*ContainerState, error) {
+	data, err := cmdOutput(r.command(ctx, "state", id), true)
 	if err != nil {
-		return nil, fmt.Errorf("%s: %s", err, data)
+		return nil, fmt.Errorf("%s: %s", err, data) //nolint:errorlint // legacy code
 	}
 	var out ContainerState
 	if err := json.Unmarshal(data, &out); err != nil {