go.mod: Bump hcsshim to v0.10.0-rc.1

This contains quite a bit (also bumps google/uuid to 1.3.0). Some HostProcess
container improvements to get ready for whenever it goes to stable in
Kubernetes, Hyper-V (windows) container support for CRI, and a plethora of
other small additions and fixes.

Signed-off-by: Daniel Canter <dcanter@microsoft.com>

vendor/github.com/Microsoft/hcsshim/internal/log/context.go

@@ -0,0 +1,116 @@
+package log
+
+import (
+	"context"
+
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+type entryContextKeyType int
+
+const _entryContextKey entryContextKeyType = iota
+
+var (
+	// L is the default, blank logging entry. WithField and co. all return a copy
+	// of the original entry, so this will not leak fields between calls.
+	//
+	// Do NOT modify fields directly, as that will corrupt state for all users and
+	// is not thread safe.
+	// Instead, use `L.With*` or `L.Dup()`. Or `G(context.Background())`.
+	L = logrus.NewEntry(logrus.StandardLogger())
+
+	// G is an alias for GetEntry
+	G = GetEntry
+
+	// S is an alias for SetEntry
+	S = SetEntry
+
+	// U is an alias for UpdateContext
+	U = UpdateContext
+)
+
+// GetEntry returns a `logrus.Entry` stored in the context, if one exists.
+// Otherwise, it returns a default entry that points to the current context.
+//
+// Note: if the a new entry is returned, it will reference the passed in context.
+// However, existing contexts may be stored in parent contexts and additionally reference
+// earlier contexts.
+// Use `UpdateContext` to update the entry and context.
+func GetEntry(ctx context.Context) *logrus.Entry {
+	entry := fromContext(ctx)
+
+	if entry == nil {
+		entry = L.WithContext(ctx)
+	}
+
+	return entry
+}
+
+// SetEntry updates the log entry in the context with the provided fields, and
+// returns both. It is equivlent to:
+//   entry := GetEntry(ctx).WithFields(fields)
+//   ctx = WithContext(ctx, entry)
+//
+// See WithContext for more information.
+func SetEntry(ctx context.Context, fields logrus.Fields) (context.Context, *logrus.Entry) {
+	e := GetEntry(ctx)
+	if len(fields) > 0 {
+		e = e.WithFields(fields)
+	}
+	return WithContext(ctx, e)
+}
+
+// UpdateContext extracts the log entry from the context, and, if the entry's
+// context points to a parent's of the current context, ands the entry
+// to the most recent context. It is equivlent to:
+//   entry :=GetEntry(ctx)
+//   ctx = WithContext(ctx, entry)
+//
+// This allows the entry to reference the most recent context and any new
+// values (such as span contexts) added to it.
+//
+// See WithContext for more information.
+func UpdateContext(ctx context.Context) context.Context {
+	// there is no way to check its ctx (and not one of its parents) that contains `e`
+	// so, at a slight cost, force add `e` to the context
+	ctx, _ = WithContext(ctx, GetEntry(ctx))
+	return ctx
+}
+
+// WithContext returns a context that contains the provided log entry.
+// The entry can be extracted with `GetEntry` (`G`)
+//
+// The entry in the context is a copy of `entry` (generated by `entry.WithContext`)
+func WithContext(ctx context.Context, entry *logrus.Entry) (context.Context, *logrus.Entry) {
+	// regardless of the order, entry.Context != GetEntry(ctx)
+	// here, the returned entry will reference the supplied context
+	entry = entry.WithContext(ctx)
+	ctx = context.WithValue(ctx, _entryContextKey, entry)
+
+	return ctx, entry
+}
+
+// Copy extracts the tracing Span and logging entry from the src Context, if they
+// exist, and adds them to the dst Context.
+//
+// This is useful to share tracing and logging between contexts, but not the
+// cancellation. For example, if the src Context has been cancelled but cleanup
+// operations triggered by the cancellation require a non-cancelled context to
+// execute.
+func Copy(dst context.Context, src context.Context) context.Context {
+	if s := trace.FromContext(src); s != nil {
+		dst = trace.NewContext(dst, s)
+	}
+
+	if e := fromContext(src); e != nil {
+		dst, _ = WithContext(dst, e)
+	}
+
+	return dst
+}
+
+func fromContext(ctx context.Context) *logrus.Entry {
+	e, _ := ctx.Value(_entryContextKey).(*logrus.Entry)
+	return e
+}