We do a bunch of distribution to remote machines (under Windows NT) using
compare-dest to make use of existing files on those machines when possible.
Up until now, the comparison directory has always been at least one level
down in the directory hierarchy, but we've just started doing full recursive
distributions of files that have a mirror structure to our C: drive itself,
and I think I've run into a buglet with --compare-dest.
The code that uses the compare-dest value blindly builds up the comparison
using "%s/%s" (with compare-dest and filename), so if you set
--compare-dest=/, you end up with filenames like "//<dir>/name" - the
leading double slash may not matter under most Unixes, but it does under
Windows (Cygwin still uses it as a UNC path) and I think POSIX permits such
a path to be system-specific (// inside a path must be ignored, but at the
start can do special stuff).
Anyway, a quick workaround appears to be to use "/." rather than just "/"
for compare-dest (or actually, since it's Windows, using "C:" works too),
but I'm guessing it's something that should probably be handled inside of
rsync better?
-- David
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