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authorJamie Liu <jamieliu@google.com>2019-12-23 13:17:29 -0800
committergVisor bot <gvisor-bot@google.com>2019-12-23 13:18:39 -0800
commitf45df7505b0e7baf48a37f7c625f05051d144738 (patch)
tree3e97a9a8b6ff95b4bb7994f51d205f58529fb6b9 /pkg/waiter/BUILD
parente548ce18051398fb3fe379326080411f59fda379 (diff)
Clean up vfs.FilesystemImpl methods that operate on parent directories.
- Make FilesystemImpl methods that operate on parent directories require !rp.Done() (i.e. there is at least one path component to resolve) as precondition and postcondition (in cases where they do not finish path resolution due to mount boundary / absolute symlink), and require that they do not need to follow the last path component (the file being created / deleted) as a symlink. Check for these in VFS. - Add FilesystemImpl.GetParentDentryAt(), which is required to obtain the old parent directory for VFS.RenameAt(). (Passing the Dentry to be renamed instead has the wrong semantics if the file named by the old path is a mount point since the Dentry will be on the wrong Mount.) - Update memfs to implement these methods correctly (?), including RenameAt. - Change fspath.Parse() to allow empty paths (to simplify implementation of AT_EMPTY_PATH). - Change vfs.PathOperation to take a fspath.Path instead of a raw pathname; non-test callers will need to fspath.Parse() pathnames themselves anyway in order to detect absolute paths and select PathOperation.Start accordingly. PiperOrigin-RevId: 286934941
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