44cea1234d
Replace the tree of nodes with a sorted list of file replacements. The most important property of this representation is that it allows replacing directories: a replacement x -> y where y is a directory could not be implemented before, because it would require making a node for every file in the tree rooted at y, or else it would require unsuccessful lookups for files like x/a/b/c/d/e/f/g/h/i/j/k to try every possible parent in order to discover the x -> y mapping. The sorted list makes it easy to find the x -> y mapping: when you do the binary search for x/a/b/c/d/e/f/g/h/i/j/k, you end up immediately after the x -> y mapping, so stepping backward one entry provides the mapping we need, if it exists. This CL does not allow overlay files to include directories, but now it is possible. This is at least useful for other kinds of experiments (like FIPS). Change-Id: Ief0afaee82e644dab8ae4eafeec20440afee2e36 Reviewed-on: https://go-review.googlesource.com/c/go/+/628701 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Matloob <matloob@golang.org> |
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