Re: [Gnu-arch-users] [PATCH] arch speedups on big trees

[Tom Lord]

    > From: Chris Mason <address@hidden>

    > Sorry, sounds like I need to understand arch merging better.
    > How is it different?

During mering, a file named by a changeset may not exist at all or may
exist at a different relative location to the top of the tree.  A file
or directory having the same relative path as something mentioned in
the changeset may, in fact, be a different file or directory (for the
purposes of patching).

In those cases where a mentioned file exists in the target tree (but
in a different place), arch_apply_changeset still needs to find it.
It uses the file id, not the relative path, to map (for example) a
.patch within the changeset to the file to which to apply that patch.

-t