Track paths and provide a rename hook.

This change also adds extensive testing to the p9 package via mocks. The sanity
checks and type checks are moved from the gofer into the core package, where
they can be more easily validated.

PiperOrigin-RevId: 218296768
Change-Id: I4fc3c326e7bf1e0e140a454cbacbcc6fd617ab55

1 files changed, 24 insertions, 0 deletions

diff --git a/pkg/p9/p9.go b/pkg/p9/p9.go
index 3b0993ecd..be644e7bf 100644
--- a/pkg/p9/p9.go
+++ b/pkg/p9/p9.go
@@ -984,6 +984,30 @@ func (s *SetAttr) Encode(b *buffer) {
 	b.Write64(s.MTimeNanoSeconds)
 }
 
+// Apply applies this to the given Attr.
+func (a *Attr) Apply(mask SetAttrMask, attr SetAttr) {
+	if mask.Permissions {
+		a.Mode = a.Mode&^PermissionsMask | (attr.Permissions & PermissionsMask)
+	}
+	if mask.UID {
+		a.UID = attr.UID
+	}
+	if mask.GID {
+		a.GID = attr.GID
+	}
+	if mask.Size {
+		a.Size = attr.Size
+	}
+	if mask.ATime {
+		a.ATimeSeconds = attr.ATimeSeconds
+		a.ATimeNanoSeconds = attr.ATimeNanoSeconds
+	}
+	if mask.MTime {
+		a.MTimeSeconds = attr.MTimeSeconds
+		a.MTimeNanoSeconds = attr.MTimeNanoSeconds
+	}
+}
+
 // Dirent is used for readdir.
 type Dirent struct {
 	// QID is the entry QID.